Urban waste water treatment per province and river basin district

Changed on: 22/04/2024 02:00

Urban waste water treatment per province and river basin district
Regions	Periods	Urban waste water treatment plants Numbers by type Total number (number)	Urban waste water treatment plants Numbers by type Mechanical treatment (number)	Urban waste water treatment plants Numbers by type Trickling filters (number)	Urban waste water treatment plants Numbers by type Aeration tanks (number)	Urban waste water treatment plants Numbers by type Oxidation tanks (number)	Urban waste water treatment plants Numbers by type Oxidation ditches (number)	Urban waste water treatment plants Numbers by type Carrousels (number)	Urban waste water treatment plants Numbers by type Discontinuous systems (number)	Urban waste water treatment plants Numbers by type Parallel installations (number)	Urban waste water treatment plants Numbers by type Multi-stage installations (number)	Urban waste water treatment plants Numbers by type Compact installations (number)	Urban waste water treatment plants Numbers by type Membrane bioreactor (number)	Urban waste water treatment plants Numbers by type Nereda granular sludge reactor (number)	Urban waste water treatment plants Numbers by type Hybrid Nereda - active sludge system (number)	Urban waste water treatment plants Capacity pollution equivalents by type Total capacity pollution equivalents (1 000 pollution equivalent)	Urban waste water treatment plants Capacity pollution equivalents by type Mechanical treatment (1 000 pollution equivalent)	Urban waste water treatment plants Capacity pollution equivalents by type Trickling filters (1 000 pollution equivalent)	Urban waste water treatment plants Capacity pollution equivalents by type Aeration tanks (1 000 pollution equivalent)	Urban waste water treatment plants Capacity pollution equivalents by type Oxidation tanks (1 000 pollution equivalent)	Urban waste water treatment plants Capacity pollution equivalents by type Oxidation ditches (1 000 pollution equivalent)	Urban waste water treatment plants Capacity pollution equivalents by type Carrousels (1 000 pollution equivalent)	Urban waste water treatment plants Capacity pollution equivalents by type Discontinuous systems (1 000 pollution equivalent)	Urban waste water treatment plants Capacity pollution equivalents by type Parallel installations (1 000 pollution equivalent)	Urban waste water treatment plants Capacity pollution equivalents by type Multi-stage installations (1 000 pollution equivalent)	Urban waste water treatment plants Capacity pollution equivalents by type Compact installations (1 000 pollution equivalent)	Urban waste water treatment plants Capacity pollution equivalents by type Membrane bioreactor (1 000 pollution equivalent)	Urban waste water treatment plants Capacity pollution equivalents by type Nereda granular sludge reactor (1 000 pollution equivalent)	Urban waste water treatment plants Capacity pollution equivalents by type Hybrid Nereda - active sludge system (1 000 pollution equivalent)	Urban waste water treatment plants Capacity inhabitant equivalents by type Total capacity inhabitant equivalents (1 000 inhabitant equivalents)	Urban waste water treatment plants Capacity inhabitant equivalents by type Mechanical treatment (1 000 inhabitant equivalents)	Urban waste water treatment plants Capacity inhabitant equivalents by type Trickling filters (1 000 inhabitant equivalents)	Urban waste water treatment plants Capacity inhabitant equivalents by type Aeration tanks (1 000 inhabitant equivalents)	Urban waste water treatment plants Capacity inhabitant equivalents by type Oxidation tanks (1 000 inhabitant equivalents)	Urban waste water treatment plants Capacity inhabitant equivalents by type Oxidation ditches (1 000 inhabitant equivalents)	Urban waste water treatment plants Capacity inhabitant equivalents by type Carrousels (1 000 inhabitant equivalents)	Urban waste water treatment plants Capacity inhabitant equivalents by type Discontinuous systems (1 000 inhabitant equivalents)	Urban waste water treatment plants Capacity inhabitant equivalents by type Parallel installations (1 000 inhabitant equivalents)	Urban waste water treatment plants Capacity inhabitant equivalents by type Multi-stage installations (1 000 inhabitant equivalents)	Urban waste water treatment plants Capacity inhabitant equivalents by type Compact installations (1 000 inhabitant equivalents)	Urban waste water treatment plants Capacity inhabitant equivalents by type Membrane bioreactor (1 000 inhabitant equivalents)	Urban waste water treatment plants Capacity inhabitant equivalents by type Nereda granular sludge reactor (1 000 inhabitant equivalents)	Urban waste water treatment plants Capacity inhabitant equivalents by type Hybrid Nereda - active sludge system (1 000 inhabitant equivalents)	Influent waste water Quantities Volume waste water (1 000 m3)	Influent waste water Quantities Pollution Equivalents (1 000 pollution equivalent)	Influent waste water Quantities Chemical oxygen demand (COD) (1 000 kg)	Influent waste water Quantities Biochemical oxygen demand (BOD) (1 000 kg)	Influent waste water Quantities Nitrogen compounds as N (total) (1 000 kg)	Influent waste water Quantities Phosphorus compounds as P (total) (1 000 kg)	Influent waste water Quantities Copper (kg)	Influent waste water Quantities Chromium (kg)	Influent waste water Quantities Zinc (kg)	Influent waste water Quantities Lead (kg)	Influent waste water Quantities Cadmium (kg)	Influent waste water Quantities Nickel (kg)	Influent waste water Quantities Mercury (kg)	Influent waste water Quantities Arsenic (kg)	Discharge of waste water (effluent) Quantities Volume waste water (1 000 m3)	Discharge of waste water (effluent) Quantities Pollution Equivalents (1 000 pollution equivalent)	Discharge of waste water (effluent) Quantities Chemical oxygen demand (COD) (1 000 kg)	Discharge of waste water (effluent) Quantities Biochemical oxygen demand (BOD) (1 000 kg)	Discharge of waste water (effluent) Quantities Nitrogen compounds as N (total) (1 000 kg)	Discharge of waste water (effluent) Quantities Phosphorus compounds as P (total) (1 000 kg)	Discharge of waste water (effluent) Quantities Copper (kg)	Discharge of waste water (effluent) Quantities Chromium (kg)	Discharge of waste water (effluent) Quantities Zinc (kg)	Discharge of waste water (effluent) Quantities Lead (kg)	Discharge of waste water (effluent) Quantities Cadmium (kg)	Discharge of waste water (effluent) Quantities Nickel (kg)	Discharge of waste water (effluent) Quantities Mercury (kg)	Discharge of waste water (effluent) Quantities Arsenic (kg)	Sewage sludge Wet sewage sludge by destination Total wet sludge (1 000 kg)	Sewage sludge Wet sewage sludge by destination Agriculture (1 000 kg)	Sewage sludge Wet sewage sludge by destination Wet oxidation (1 000 kg)	Sewage sludge Wet sewage sludge by destination Composting (1 000 kg)	Sewage sludge Wet sewage sludge by destination Landfill (1 000 kg)	Sewage sludge Wet sewage sludge by destination Incineration (1 000 kg)	Sewage sludge Wet sewage sludge by destination Cement industry (1 000 kg)	Sewage sludge Wet sewage sludge by destination Co-incineration at power plants (1 000 kg)	Sewage sludge Wet sewage sludge by destination Other destinations (1 000 kg)	Sewage sludge Dry solids by destination Total dry solids (1 000 kg)	Sewage sludge Dry solids by destination Agriculture (1 000 kg)	Sewage sludge Dry solids by destination Wet oxidation (1 000 kg)	Sewage sludge Dry solids by destination Composting (1 000 kg)	Sewage sludge Dry solids by destination Landfill (1 000 kg)	Sewage sludge Dry solids by destination Incineration (1 000 kg)	Sewage sludge Dry solids by destination Cement industry (1 000 kg)	Sewage sludge Dry solids by destination Co-incineration at power plants (1 000 kg)	Sewage sludge Dry solids by destination Other destinations (1 000 kg)	Sewage sludge Nutrients and heavy metals Ashes (1 000 kg)	Sewage sludge Nutrients and heavy metals Nitrogen compounds as N (1 000 kg)	Sewage sludge Nutrients and heavy metals Phosphorus compounds as P (1 000 kg)	Sewage sludge Nutrients and heavy metals Copper (kg)	Sewage sludge Nutrients and heavy metals Chromium (kg)	Sewage sludge Nutrients and heavy metals Zinc (kg)	Sewage sludge Nutrients and heavy metals Lead (kg)	Sewage sludge Nutrients and heavy metals Cadmium (kg)	Sewage sludge Nutrients and heavy metals Nickel (kg)	Sewage sludge Nutrients and heavy metals Mercury (kg)	Sewage sludge Nutrients and heavy metals Arsenic (kg)
Nederland	2022	313	0	1	62	49	44	120	2	11	11	1	0	10	2	29,995	0	54	10,411	4,362	1,182	10,005	91	1,092	1,502	91	0	843	363	23,661	0	60	8,445	3,260	945	7,757	72	794	1,320	60	0	692	255	1,807,838	26,146	1,010,854	409,133	92,433	12,944	115,023	14,284	386,774	23,686	282	16,758	131	6,037	1,807,838	1,827	67,228	7,107	12,960	1,609	8,881	2,198	69,221	1,333	60	7,360	18	2,531	1,299,154	0	0	0	6,521	919,802	16,591	321,536	34,704	300,041	0	0	0	1,494	220,991	15,503	53,936	8,116	89,938	17,755	11,004	109,077	11,795	298,603	23,100	280	7,670	134	3,006
Noord-Nederland (LD)	2022	61	0	1	9	10	5	28	1	3	2	1	0	0	1	3,369	0	54	651	375	81	1,318	40	322	97	91	0	0	340	2,531	0	60	501	288	59	970	32	250	74	60	0	0	237	206,923	2,683	104,878	44,650	9,195	1,378	11,362	1,767	41,703	2,686	32	2,064	20	576	206,923	225	8,803	901	1,269	169	980	256	7,678	159	10	868	3	247	148,202	0	0	0	4,977	95,265	0	47,961	0	35,381	0	0	0	1,137	22,639	0	11,605	0	11,350	1,848	1,222	10,616	1,435	29,981	2,495	26	971	20	291
Oost-Nederland (LD)	2022	81	0	0	13	13	19	25	0	3	3	0	0	4	1	6,812	0	0	1,922	1,684	389	2,333	0	185	115	0	0	162	23	5,170	0	0	1,508	1,218	306	1,761	0	134	95	0	0	130	18	350,550	6,125	238,280	94,039	21,311	3,001	24,036	2,485	72,237	3,809	48	2,899	27	1,006	350,550	385	13,894	1,275	2,673	384	1,800	385	13,437	215	7	1,224	3	400	346,792	0	0	0	315	80,817	0	248,427	17,233	60,993	0	0	0	100	20,013	0	36,404	4,475	19,282	4,113	2,149	20,789	2,710	64,136	4,149	59	1,612	25	565
West-Nederland (LD)	2022	121	0	0	25	21	6	56	1	5	5	0	0	2	0	13,382	0	0	4,582	1,860	98	4,811	51	585	927	0	0	468	0	10,374	0	0	3,572	1,421	77	3,690	40	410	779	0	0	386	0	821,170	11,461	437,711	181,388	41,594	5,572	53,428	5,317	168,671	12,118	143	5,916	60	3,166	821,170	794	28,568	3,108	6,019	710	4,030	746	25,853	644	32	2,638	9	1,346	535,501	0	0	0	1,229	494,583	0	22,218	17,471	129,250	0	0	0	257	120,161	0	5,190	3,641	34,216	7,706	4,735	48,515	3,829	122,985	10,578	105	2,706	56	1,639
Zuid-Nederland (LD)	2022	50	0	0	15	5	14	11	0	0	1	0	0	4	0	6,432	0	0	3,255	443	615	1,543	0	0	363	0	0	212	0	5,586	0	0	2,865	334	503	1,336	0	0	372	0	0	176	0	429,196	5,878	229,985	89,056	20,334	2,993	26,197	4,715	104,164	5,073	59	5,878	23	1,289	429,196	423	15,964	1,823	2,999	346	2,071	811	22,252	315	11	2,630	3	538	268,659	0	0	0	0	249,137	16,591	2,931	0	74,417	0	0	0	0	58,178	15,503	737	0	25,090	4,088	2,899	29,156	3,821	81,501	5,877	90	2,382	33	511
Groningen (PV)	2022	22	0	0	4	4	2	8	1	1	1	0	0	0	1	1,017	0	0	180	110	13	260	40	17	56	0	0	0	340	741	0	0	130	80	11	195	32	15	41	0	0	0	237	67,837	807	32,512	12,675	2,557	412	3,351	633	12,227	766	9	543	7	164	67,837	83	3,313	437	528	54	296	71	2,507	44	2	200	1	69	47,572	0	0	0	0	0	0	47,572	0	11,497	0	0	0	0	0	0	11,497	0	4,283	396	445	3,967	446	10,951	835	12	336	7	107
Fryslân (PV)	2022	27	0	1	0	4	1	18	0	1	1	1	0	0	0	1,336	0	54	0	170	16	828	0	136	41	91	0	0	0	1,006	0	60	0	120	10	604	0	119	33	60	0	0	0	84,960	1,074	40,830	18,883	3,929	565	4,573	758	15,595	1,170	16	989	6	291	84,960	83	3,398	254	380	69	422	150	2,813	80	6	439	1	129	68,894	0	0	0	4,839	64,055	0	0	0	15,566	0	0	0	1,096	14,470	0	0	0	4,826	956	510	4,370	754	12,615	1,169	9	426	11	159
Drenthe (PV)	2022	12	0	0	5	2	2	2	0	1	0	0	0	0	0	1,016	0	0	471	95	51	230	0	169	0	0	0	0	0	784	0	0	371	87	38	172	0	116	0	0	0	0	0	54,126	802	31,535	13,093	2,710	401	3,438	376	13,881	750	7	532	7	121	54,126	59	2,092	210	360	47	261	35	2,357	35	2	229	1	49	31,736	0	0	0	138	31,210	0	389	0	8,318	0	0	0	41	8,169	0	108	0	2,241	497	266	2,279	235	6,415	492	5	209	3	25
Overijssel (PV)	2022	32	0	0	9	6	10	2	0	1	2	0	0	1	1	2,196	0	0	899	632	290	218	0	21	90	0	0	22	23	1,740	0	0	703	508	223	182	0	14	75	0	0	17	18	109,322	1,761	67,663	26,818	6,295	894	9,159	741	28,440	1,702	18	1,121	8	259	109,322	111	4,312	322	785	100	649	60	4,388	56	2	479	1	97	94,144	0	0	0	315	54,274	0	39,555	0	16,570	0	0	0	100	14,410	0	2,059	0	6,047	1,359	697	7,790	1,077	21,143	1,425	16	605	8	121
Flevoland (PV)	2022	5	0	0	0	1	0	4	0	0	0	0	0	0	0	765	0	0	0	65	0	700	0	0	0	0	0	0	0	612	0	0	0	52	0	560	0	0	0	0	0	0	0	28,153	630	23,742	10,656	2,355	307	2,001	172	5,472	153	4	146	2	272	28,153	26	929	76	185	16	126	46	1,038	10	0	59	0	61	39,174	0	0	0	0	25,178	0	10,451	3,545	8,566	0	0	0	0	5,320	0	2,425	822	1,865	607	272	1,911	178	4,553	165	4	127	3	206
Gelderland (PV)	2022	44	0	0	4	6	9	19	0	2	1	0	0	3	0	3,851	0	0	1,023	986	98	1,415	0	164	25	0	0	140	0	2,818	0	0	805	658	83	1,020	0	120	20	0	0	113	0	213,075	3,734	146,875	56,565	12,661	1,799	12,877	1,573	38,324	1,954	26	1,632	17	475	213,075	249	8,652	877	1,702	269	1,025	279	8,010	150	5	686	2	241	213,474	0	0	0	0	1,365	0	198,421	13,689	35,857	0	0	0	0	283	0	31,920	3,654	11,371	2,147	1,179	11,088	1,455	38,440	2,560	39	880	14	238
Utrecht (PV)	2022	23	0	0	3	4	0	14	0	0	1	0	0	1	0	2,110	0	0	185	108	0	1,365	0	0	19	0	0	432	0	1,680	0	0	145	79	0	1,082	0	0	14	0	0	360	0	116,165	1,836	71,234	29,148	6,407	829	8,398	1,068	31,010	1,731	22	894	11	309	116,165	105	3,920	404	759	79	879	129	5,211	91	3	337	2	107	92,257	0	0	0	0	75,417	0	16,454	386	19,947	0	0	0	0	15,867	0	3,985	94	5,136	1,316	737	5,913	505	18,254	1,361	14	325	7	119
Noord-Holland (PV)	2022	30	0	0	8	5	3	8	1	3	2	0	0	0	0	4,565	0	0	1,930	1,038	82	785	51	433	246	0	0	0	0	3,727	0	0	1,737	781	63	587	40	305	213	0	0	0	0	268,451	3,915	147,878	70,846	14,551	1,968	21,034	1,663	57,825	4,628	62	1,503	18	835	268,451	285	9,734	1,098	2,016	204	1,364	211	7,919	237	16	644	2	333	162,631	0	0	0	1,229	138,579	0	5,764	17,058	47,815	0	0	0	257	42,811	0	1,205	3,542	12,450	2,465	1,750	19,384	1,358	46,997	3,660	37	936	21	483
Zuid-Holland (PV)	2022	53	0	0	3	12	3	32	0	1	2	0	0	0	0	5,908	0	0	1,833	714	16	2,618	0	65	662	0	0	0	0	4,405	0	0	1,242	561	13	1,989	0	46	552	0	0	0	0	388,599	5,144	197,702	73,518	18,436	2,533	20,458	2,244	68,080	4,915	48	3,151	26	1,670	388,599	353	13,127	1,403	2,882	386	1,536	355	10,840	288	10	1,545	5	745	256,767	0	0	0	0	256,741	0	0	27	55,679	0	0	0	0	55,674	0	0	5	14,659	3,617	2,058	20,270	1,757	50,664	4,984	47	1,308	26	877
Zeeland (PV)	2022	15	0	0	11	0	0	2	0	1	0	0	0	1	0	799	0	0	634	0	0	43	0	86	0	0	0	36	0	563	0	0	447	0	0	31	0	59	0	0	0	26	0	47,954	565	20,898	7,876	2,200	242	3,538	341	11,755	844	11	368	5	352	47,954	51	1,786	203	363	41	252	51	1,883	29	3	113	1	160	23,846	0	0	0	0	23,846	0	0	0	5,809	0	0	0	0	5,809	0	0	0	1,971	308	190	2,948	208	7,069	573	6	137	3	160
Noord-Brabant (PV)	2022	33	0	0	11	2	14	5	0	0	1	0	0	0	0	4,386	0	0	2,772	16	615	620	0	0	363	0	0	0	0	3,933	0	0	2,501	11	503	547	0	0	372	0	0	0	0	293,066	4,155	163,147	65,292	14,254	2,294	19,453	2,975	59,772	3,003	44	2,996	15	734	293,066	273	10,661	1,103	1,951	268	1,664	482	13,434	170	9	1,449	2	290	221,601	0	0	0	0	218,671	0	2,931	0	51,111	0	0	0	0	50,374	0	737	0	16,847	2,843	2,111	22,969	2,604	54,659	4,116	60	1,485	21	393
Limburg (PV)	2022	17	0	0	4	3	0	6	0	0	0	0	0	4	0	2,046	0	0	484	427	0	922	0	0	0	0	0	212	0	1,653	0	0	365	323	0	790	0	0	0	0	0	176	0	136,129	1,723	66,838	23,764	6,080	699	6,743	1,740	44,392	2,070	15	2,883	9	555	136,129	150	5,303	719	1,048	79	407	329	8,819	145	2	1,181	2	248	47,058	0	0	0	0	30,466	16,591	0	0	23,306	0	0	0	0	7,803	15,503	0	0	8,242	1,245	788	6,188	1,218	26,841	1,761	30	897	11	118
The river Eems	2022	16	0	0	7	3	0	4	0	0	1	0	0	0	1	1,134	0	0	366	102	0	270	0	0	56	0	0	0	340	819	0	0	267	73	0	201	0	0	41	0	0	0	237	72,258	895	35,939	14,210	2,863	446	3,955	724	14,165	822	10	585	11	157	72,258	94	3,663	494	581	60	368	71	3,083	49	2	202	1	66	47,572	0	0	0	0	0	0	47,572	0	11,497	0	0	0	0	0	0	11,497	0	4,283	396	445	3,967	446	10,951	835	12	336	7	107
The river Rijn (North Rijn)	2022	38	0	1	0	5	4	23	1	2	1	1	0	0	0	1,521	0	54	0	178	45	918	40	153	41	91	0	0	0	1,157	0	60	0	127	33	678	32	134	33	60	0	0	0	97,767	1,218	46,572	21,157	4,398	642	5,150	814	18,032	1,297	18	1,052	7	324	97,767	97	3,926	312	468	82	466	158	3,213	86	7	464	1	143	68,894	0	0	0	4,839	64,055	0	0	0	15,566	0	0	0	1,096	14,470	0	0	0	4,826	956	510	4,370	754	12,615	1,169	9	426	11	159
The river Rijn (East Rijn)	2022	73	0	0	13	14	15	23	0	2	2	0	0	3	1	6,863	0	0	1,515	1,742	385	2,825	0	190	90	0	0	92	23	5,178	0	0	1,174	1,284	299	2,137	0	130	75	0	0	61	18	346,273	5,927	229,013	91,330	20,960	2,885	23,342	2,393	79,034	4,119	49	2,849	29	996	346,273	362	13,299	1,012	2,444	307	1,852	374	14,362	223	6	1,257	3	367	347,596	0	0	0	453	110,662	0	218,862	17,619	62,139	0	0	0	141	27,899	0	29,529	4,569	19,054	4,237	2,236	20,522	2,754	64,864	4,214	58	1,667	25	534
The river Rijn (Central Rijn)	2022
The river Rijn (West Rijn)	2022	114	0	0	16	22	9	52	1	6	6	0	0	2	0	13,096	0	0	4,641	1,896	130	4,262	51	662	952	0	0	502	0	10,240	0	0	3,692	1,442	104	3,263	40	472	799	0	0	429	0	804,996	11,543	443,721	183,669	41,274	5,676	52,260	5,253	158,091	11,424	135	5,983	55	2,868	804,996	793	28,320	3,230	6,065	767	3,828	728	24,176	625	32	2,676	9	1,235	537,465	0	0	0	1,229	466,980	0	52,171	17,085	129,504	0	0	0	257	113,527	0	12,173	3,547	34,453	7,694	4,688	47,707	3,786	120,748	10,354	103	2,704	56	1,516
The river Maas	2022	52	0	0	14	3	14	16	0	0	1	0	0	4	0	6,079	0	0	2,784	427	606	1,686	0	0	363	0	0	212	0	5,242	0	0	2,428	323	496	1,448	0	0	372	0	0	176	0	401,301	5,512	215,642	83,674	19,088	2,771	25,447	4,160	100,628	4,923	60	5,340	24	1,207	401,301	383	14,318	1,721	2,686	272	2,014	648	21,673	307	11	2,419	3	502	245,175	0	0	0	0	225,653	16,591	2,931	0	69,438	0	0	0	0	53,198	15,503	737	0	22,729	3,876	2,712	26,641	3,465	75,911	5,436	82	2,195	31	452
The river Schelde	2022	20	0	0	12	2	2	2	0	1	0	0	0	1	0	1,302	0	0	1,105	16	16	43	0	86	0	0	0	36	0	1,024	0	0	884	11	13	31	0	59	0	0	0	26	0	85,243	1,051	39,966	15,093	3,850	524	4,869	940	16,824	1,101	11	950	5	485	85,243	98	3,703	338	716	121	353	220	2,715	42	3	341	1	218	52,453	0	0	0	0	52,453	0	0	0	11,897	0	0	0	0	11,897	0	0	0	4,593	597	413	5,870	590	13,513	1,093	15	342	6	239
Source: CBS.

Explanation of symbols

Table explanation

This table presents the most significant results of the annual survey Public treatment of urban waste water. The results are presented per province and river basin district (Rijn, Maas, Eems and Schelde) and include:
- number and capacity of the urban waste water treatment plants by type of treatment;
- the volume and concentration of organic matter, nutrients and heavy metals in the waste water running into waste water treatment plants (influent) and the volume of treated waste water (effluent). As of 2017, data on heavy metals are only inventoried for even years.
- the volume and destination of the sludge released, with nutrients and heavy metals. As of 2017, sludge data are only inventoried for even years.
Additional data on urban waste water treatment plants, process technology, energy consumption, generation of energy and sludge dewatering can be accessed on the Dutch version of StatLine.

Data available from: 1981

Status of the figures:
The figures in this table are definitive.

Changes as of 22 April 2024:
The figures of 2022 has been added.

When will new figures be published?
New figures on 2023 will be published by March 2025.

Description topics

Urban waste water treatment plants

The number and capacity of urban waste water treatment plants in the Netherlands where nearly all domestic waste water and waste water from the private sector is treated. The plants are all operated by regional water quality control authorities.

Numbers by type

Number of sewage water treatment plants broken down by method of treatment.

Total number: The total number of urban waste water treatment plants in the Netherlands.

Mechanical treatment: Installation where suspended matter is extracted from waste water by settlement.

Trickling filters: Waste water is sprinkled over a layer of porous stones covered with bacteria (biofilm). Thus, organic compounds in the waste water are degraded.

Aeration tanks: Pre-settled waste water runs through an intensively aerated basin containing active sludge (bacteria). Organic pollutants are degraded by oxygen and active sludge. The treatment process takes up only a short period of time and the sludge load is high which is typical of aeration basins.

Oxidation tanks: Operates by the same principle as the aeration tank but the sludge load is significantly lower. The resulting sludge is highly mineralised and will therefore decompose more slowly.

Oxidation ditches: In oxidation ditches, waste water is directed through a aeration circuit several times. The process takes up 2 or 3 days. Consequently, the sludge load is extremely low.

Carrousels: This technology is chiefly applied in large installations. Typical of carrousels are the depth (between 2 to 4 metres) and the aeration method.

Discontinuous systems: Oxidation basins and oxidation ditches. Waste water is let in batch-controlled.

Parallel installations: Various combinations of treatment systems (so-called 'streets') are applied in one installation.

Multi-stage installations: A serial process consisting of two systems, for instance, a trickling filter and an aeration basin. The waste water runs through both stages.

Compact installations: A system consisting of a basin subdivided into four segments. Waste water flows into the aeration segment. Subsequently, the sludge is separated in the central aeration zone. Then part of the sludge is conditioned in the reaeration zone and led back into the aeration zone. The other part (surplus sludge) is stabilised in the sludge mineralisation zone and subsequently removed.

Membrane bioreactor: A system where the sludge is separated from the waste water by using a membrane.

Nereda granular sludge reactor: In the Nereda granular sludge reactor the wastewater is purified by micro-organism clogged in natural granular structures of high density. These granules have a high biological activity and make it easy to separate the micro-organisms from the treated wastewater.

As from 2019 this new treatment type is distinghuished separately in Statline. In the period 2011-2018 already 4 Nereda systems became operational. Until 2019, these installations were classified as oxidation tanks and/or discontinous systems.

Hybrid Nereda - active sludge system: System consisting of a parallel operated Nereda granular sludge reactor and activated sludge system.

In the Nereda granular sludge reactor the wastewater is purified by micro-organism clogged in natural granular structures of high density. These granules have a high biological activity and make it easy to separate the sludge from the treated wastewater.

In activated sludge systems the wastewater is treated in bassins with flocculated sludge . This sludge clumps exists of microorganisms that feed on the the organic pollution in wastewater.

As from 2019 this new treatment type is distinghuished separately in Statline. In the period 2013-2018 already 2 hybrid Nereda - activated sludge sytems became operational. Until 2019, these installations were classified as parallel installations.

Capacity pollution equivalents by type

Capacity urban waste water treatment plant:
A value that indicates how much organic pollution theoretically can be treated by a waste water treatment plant.

The pollution equivalent is the official unit that quantifies the pollution in waste water; one pollution equivalent = 150 g TOD (Total Oxygen Demand).
One pollution equivalent is the daily quantity of oxygen-demanding material in the waste water of one person. The degree of pollution in the waste water produced by the private sector is also expressed in pollution equivalents.
This unit is used as of 2010, so for previous years no values are available.

Total capacity pollution equivalents

Mechanical treatment: Installation where suspended matter is extracted from waste water by settlement.

Trickling filters: Waste water is sprinkled over a layer of porous stones covered with bacteria (biofilm). Thus, organic compounds in the waste water are degraded.

Aeration tanks: Pre-settled waste water runs through an intensively aerated basin containing active sludge (bacteria). Organic pollutants are degraded by oxygen and active sludge. The treatment process takes up only a short period of time and the sludge load is high which is typical of aeration basins.

Oxidation tanks: Operates by the same principle as the aeration tank but the sludge load is significantly lower. The resulting sludge is highly mineralised and will therefore decompose more slowly.

Oxidation ditches: In oxidation ditches, waste water is directed through a aeration circuit several times. The process takes up 2 or 3 days. Consequently, the sludge load is extremely low.

Carrousels: This technology is chiefly applied in large installations. Typical of carrousels are the depth (between 2 to 4 metres) and the aeration method.

Discontinuous systems: Oxidation basins and oxidation ditches. Waste water is let in batch-controlled.

Parallel installations: Various combinations of treatment systems (so-called 'streets') are applied in one installation.

Multi-stage installations: A serial process consisting of two systems, for instance, a trickling filter and an aeration basin. The waste water runs through both stages.

Compact installations: A system consisting of a basin subdivided into four segments. Waste water flows into the aeration segment. Subsequently, the sludge is separated in the central aeration zone. Then part of the sludge is conditioned in the reaeration zone and led back into the aeration zone. The other part (surplus sludge) is stabilised in the sludge mineralisation zone and subsequently removed.

Membrane bioreactor: A system where the sludge is separated from the waste water by using a membrane.

Nereda granular sludge reactor: In the Nereda granular sludge reactor the wastewater is purified by micro-organism clogged in natural granular structures of high density. These granules have a high biological activity and make it easy to separate the micro-organisms from the treated wastewater.

As from 2019 this new treatment type is distinghuished separately in Statline. In the period 2011-2018 already 4 Nereda systems became operational. Until 2019, these installations were classified as oxidation tanks and/or discontinous systems.

Hybrid Nereda - active sludge system: System consisting of a parallel operated Nereda granular sludge reactor and activated sludge system.

In the Nereda granular sludge reactor the wastewater is purified by micro-organism clogged in natural granular structures of high density. These granules have a high biological activity and make it easy to separate the sludge from the treated wastewater.

In activated sludge systems the wastewater is treated in bassins with flocculated sludge . This sludge clumps exists of microorganisms that feed on the the organic pollution in wastewater.

As from 2019 this new treatment type is distinghuished separately in Statline. In the period 2013-2018 already 2 hybrid Nereda - activated sludge sytems became operational. Until 2019, these installations were classified as parallel installations.

Capacity inhabitant equivalents by type

Capacity urban waste water treatment plant:
A value that indicates how much organic pollution theoretically can be treated by a waste water treatment plant.

The capacity expressed in Inhabitant Equivalents is determined on basis of: one inhabitant equivalent = 54 g BOD (Biological Oxygen Demand).
One inhabitant equivalent is the daily quantity of oxygen-demanding, organic substances in the waste water of one person.
Nowadays, the use of the unit inhabitant equivalent is decreasing. The most common unit is the pollution equivalent.

Total capacity inhabitant equivalents: The total capacity of all urban waste water treatment plants.

Mechanical treatment: Installation where suspended matter is extracted from waste water by settlement.

Trickling filters: Waste water is sprinkled over a layer of porous stones covered with bacteria (biofilm). Thus, organic compounds in the waste water are degraded.

Aeration tanks: Pre-settled waste water runs through an intensively aerated basin containing active sludge (bacteria). Organic pollutants are degraded by oxygen and active sludge. The treatment process takes up only a short period of time and the sludge load is high which is typical of aeration basins.

Oxidation tanks: Operates by the same principle as the aeration tank but the sludge load is significantly lower. The resulting sludge is highly mineralised and will therefore decompose more slowly.

Oxidation ditches: In oxidation ditches, waste water is directed through a aeration circuit several times. The process takes up 2 or 3 days. Consequently, the sludge load is extremely low.

Carrousels: This technology is chiefly applied in large installations. Typical of carrousels are the depth (between 2 to 4 metres) and the aeration method.

Discontinuous systems: Oxidation basins and oxidation ditches. Waste water is let in batch-controlled.

Parallel installations: Various combinations of treatment systems (so-called 'streets') are applied in one installation.

Multi-stage installations: A serial process consisting of two systems, for instance, a trickling filter and an aeration basin. The waste water runs through both stages.

Compact installations: A system consisting of a basin subdivided into four segments. Waste water flows into the aeration segment. Subsequently, the sludge is separated in the central aeration zone. Then part of the sludge is conditioned in the reaeration zone and led back into the aeration zone. The other part (surplus sludge) is stabilised in the sludge mineralisation zone and subsequently removed.

Membrane bioreactor: A system where the sludge is separated from the waste water by using a membrane.

Nereda granular sludge reactor: In the Nereda granular sludge reactor the wastewater is purified by micro-organism clogged in natural granular structures of high density. These granules have a high biological activity and make it easy to separate the micro-organisms from the treated wastewater.

As from 2019 this new treatment type is distinghuished separately in Statline. In the period 2011-2018 already 4 Nereda systems became operational. Until 2019, these installations were classified as oxidation tanks and/or discontinous systems.

Hybrid Nereda - active sludge system: System consisting of a parallel operated Nereda granular sludge reactor and activated sludge system.

In the Nereda granular sludge reactor the wastewater is purified by micro-organism clogged in natural granular structures of high density. These granules have a high biological activity and make it easy to separate the sludge from the treated wastewater.

In activated sludge systems the wastewater is treated in bassins with flocculated sludge . This sludge clumps exists of microorganisms that feed on the the organic pollution in wastewater.

As from 2019 this new treatment type is distinghuished separately in Statline. In the period 2013-2018 already 2 hybrid Nereda - activated sludge sytems became operational. Until 2019, these installations were classified as parallel installations.

Influent waste water

Data on concentrations and quantities of pollutants in the waste water running into urban waste water treatment plants (influent).

Quantities

Volume waste water: The annual volume of influent waste water.

Pollution Equivalents: The pollution equivalent is the official unit that quantifies the pollution in waste water; one pollution equivalent = 150 g TOD (Total Oxygen Demand).
One pollution equivalent is the daily quantity of oxygen-demanding material in the waste water of one person. The degree of pollution in the waste water produced by the private sector is also expressed in pollution equivalents.
This unit is used as of 2010, so for previous years no values are available.

Chemical oxygen demand (COD): Chemical oxygen demand (COD). Measure of the amount of oxygen consumed when a substance is degraded chemically.

Biochemical oxygen demand (BOD): Biological oxygen demand (BOD). Measure of the amount of oxygen consumed when a substance is biodegraded.

Nitrogen compounds as N (total): The total amount of nitrogen in organic compounds (e.g. proteins) and inorganic compounds (e.g. nitrate and ammonium)

Phosphorus compounds as P (total): The total amount of phosphates and other phosphorus compounds in waste water, measured as phosphorus (P).

Copper

Chromium

Zinc

Lead

Cadmium

Nickel

Mercury

Arsenic

Discharge of waste water (effluent)

Data on concentrations and quantities of pollutants in treated waste water (effluent) discharged from urban waste water treatment plants.

Quantities

Volume waste water: The annual volume of effluent waste water.

Pollution Equivalents: The pollution equivalent is the official unit that quantifies the pollution in waste water; one pollution equivalent = 150 g TOD (Total Oxygen Demand).
One pollution equivalent is the daily quantity of oxygen-demanding material in the waste water of one person. The degree of pollution in the waste water produced by the private sector is also expressed in pollution equivalents.
This unit is used as of 2010, so for previous years no values are available.

Chemical oxygen demand (COD): Chemical oxygen demand (COD). Measure of the amount of oxygen consumed when a substance is degraded chemically.

Biochemical oxygen demand (BOD): Biological oxygen demand (BOD). Measure of the amount of oxygen consumed when a substance is biodegraded.

Nitrogen compounds as N (total): The total amount of nitrogen in organic compounds (e.g. proteins) and inorganic compounds (e.g. nitrate and ammonium).

Phosphorus compounds as P (total): The total amount of phosphates and other phosphorus compounds in waste water, measured as phosphorus (P).

Copper

Chromium

Zinc

Lead

Cadmium

Nickel

Mercury

Arsenic

Sewage sludge

Residue of treated waste water consisting of suspended solids and excess active sludge (biomass). Sewage sludge is measured including water (see Total wet sludge) or as dry solids.

Wet sewage sludge by destination

The volume of wet sewage sludge, i.e. including water by destination (processing method).

Total wet sludge: Total wet sludge discharged.

Agriculture: Application of manure or soil improver in agriculture. Due to rigid legislation impossible since 1995.

Wet oxidation: Wet oxidation of sludge in so-called VerTech installations: the sludge is oxidised under high pressure in a deep shaft.

Composting

Landfill: Dumping of sludge on regional landfill sites or special sludge depots.

Incineration: Incineration of sludge in special sludge incineration plants or in household waste incinerators.

Cement industry: Co-incineration in cement ovens.

Co-incineration at power plants: Sewage sludge used as a secondary fuel at a power plant.

Other destinations: Mainly reuse.

Dry solids by destination

Discharged sewage sludge in kilogrammes of dry solids by destination (processing method). Dry solid is the residue of sewage sludge after evaporation at 105 degrees centigrade.

Total dry solids

Agriculture: Application of manure or soil improver in agriculture. Due to rigid legislation impossible since 1995.

Wet oxidation: Wet oxidation of sludge in so-called VerTech installations: the sludge is oxidised under high pressure in a deep shaft.

Composting

Landfill: Dumping of sludge on regional landfill sites or special sludge depots.

Incineration: Incineration of sludge in special sludge incineration plants or in household waste incinerators.

Cement industry: Co-incineration in cement ovens.

Co-incineration at power plants: Sewage sludge used as a secondary fuel at a power plant.

Other destinations: Mainly reuse.

Nutrients and heavy metals

The total weight of nutrients and heavy metals removed with the sludge. Most heavy metals adsorb strongly to the sludge particles.

Ashes: The residue of non-inflammable, inorganic matter after incineration.

Nitrogen compounds as N: The total amount of nitrogen in organic compounds (e.g. proteins) and inorganic compounds (e.g. nitrate and ammonium).

Phosphorus compounds as P: The total amount of phosphorus in sewage sludge is analysed as P205 (diphosphorus pentoxide) converted to P total.

Copper

Chromium

Zinc

Lead

Cadmium

Nickel

Mercury

Arsenic