Urban waste water treatment per province and river basin district

Urban waste water treatment per province and river basin district

Periods Regions Urban waste water treatment plants Numbers by type Total number (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 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 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 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) 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)
2018 Nederland 323 2 58 67 47 119 2 12 15 1 . . 29,942 108 10,260 5,074 1,131 9,821 49 1,076 2,332 91 . . 1,773,436 26,406 1,016,606 426,326 94,116 13,307 138,509 17,029 438,978 36,314 405 20,818 210 6,659 1,773,436 1,909 69,057 7,415 14,006 1,676 8,432 2,463 66,133 1,883 132 7,946 54 3,011 1,250,205 0 0 0 132,909 880,373 6,533 227,003 3,388 303,618 0 0 0 31,908 197,799 6,009 67,174 728 89,104 17,575 9,768 114,825 11,311 299,297 25,033 301 7,488 159 3,194
2019 Nederland 317 2 59 59 46 117 1 11 13 1 6 2 29,784 108 10,165 4,881 1,152 9,747 40 1,054 1,512 91 672 363 1,904,102 26,144 1,002,491 427,966 94,209 13,555 . . . . . . . . 1,904,102 2,019 73,296 7,765 14,391 1,767 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2018 The river Eems 16 0 7 3 0 4 0 0 2 0 . . 1,134 0 366 102 0 270 0 0 396 0 . . 68,615 864 34,297 15,103 2,853 389 6,864 641 12,603 1,387 14 383 12 207 68,615 85 3,344 425 496 50 525 95 1,210 49 4 108 3 104 45,253 0 0 0 0 0 0 45,253 0 11,172 0 0 0 0 0 0 11,172 0 4,242 552 274 5,034 384 12,350 987 10 333 6 109
2019 The river Eems 16 0 7 3 0 4 0 0 1 0 0 1 1,134 0 366 102 0 270 0 0 56 0 0 340 75,107 877 34,519 14,855 2,954 406 . . . . . . . . 75,107 94 3,701 454 535 65 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2018 The river Rijn (North Rijn) 38 1 0 5 4 24 1 1 1 1 . . 1,565 54 0 222 45 1,054 40 17 41 91 . . 89,276 1,177 45,090 18,435 4,234 638 5,450 732 18,247 1,318 17 667 10 336 89,276 99 3,927 332 502 89 304 93 2,890 62 7 231 3 164 66,485 0 0 0 0 66,485 0 0 0 14,288 0 0 0 0 14,288 0 0 0 3,808 975 539 3,572 386 5,536 664 5 329 4 73
2019 The river Rijn (North Rijn) 38 1 0 5 4 24 1 1 1 1 0 0 1,565 54 0 222 45 1,054 40 17 41 91 0 0 101,744 1,173 44,506 18,157 4,310 621 . . . . . . . . 101,744 102 4,127 334 490 85 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2018 The river Rijn (East Rijn) 73 0 12 19 11 23 0 3 5 0 . . 6,863 0 1,465 1,924 262 2,814 0 212 186 0 . . 341,893 6,133 243,688 90,839 20,154 2,868 22,933 3,054 99,723 5,777 89 3,280 43 1,143 341,893 355 12,937 963 2,485 301 1,208 429 13,648 329 29 1,207 10 414 251,093 0 0 0 95,902 22,891 0 132,301 0 60,938 0 0 0 23,241 5,464 0 32,233 0 19,030 3,591 1,937 21,596 2,583 71,488 4,971 60 1,728 34 600
2019 The river Rijn (East Rijn) 73 0 13 15 13 22 0 2 5 0 2 1 6,885 0 1,545 1,874 314 2,683 0 190 186 0 72 23 359,539 6,179 245,781 93,963 20,535 3,013 . . . . . . . . 359,539 378 13,685 1,049 2,586 327 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2018 The river Rijn (Central Rijn)
2019 The river Rijn (Central Rijn)
2018 The river Rijn (West Rijn) 120 1 17 26 13 50 0 7 6 0 . . 13,016 54 4,710 2,022 171 3,953 0 760 1,346 0 . . 788,501 11,495 433,835 191,226 42,808 5,821 62,216 5,470 168,978 16,378 187 6,535 93 3,258 788,501 845 29,834 3,382 6,564 805 3,851 898 24,238 932 64 2,628 28 1,508 548,947 0 0 0 29,092 467,018 0 49,449 3,388 133,530 0 0 0 6,690 102,343 0 23,769 728 36,366 7,943 4,277 52,946 4,320 130,569 11,967 123 2,799 74 1,670
2019 The river Rijn (West Rijn) 118 1 17 25 13 49 0 7 5 0 1 0 12,876 54 4,593 1,990 171 4,010 0 760 866 0 432 0 859,488 11,086 411,925 191,796 42,740 5,835 . . . . . . . . 859,488 881 31,108 3,317 6,584 810 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2018 The river Maas 55 0 15 6 17 16 0 0 1 0 . . 6,053 0 2,786 581 637 1,686 0 0 363 0 . . 398,762 5,739 222,227 93,924 20,311 3,061 34,968 5,948 124,304 10,289 83 8,864 40 1,255 398,762 415 15,004 1,818 3,186 312 2,160 792 21,550 457 22 3,387 8 587 280,099 0 0 0 2,835 270,731 6,533 0 0 71,152 0 0 0 672 64,471 6,009 0 0 21,022 3,883 2,313 25,424 2,920 64,471 5,067 81 1,970 34 448
2019 The river Maas 52 0 15 4 14 16 0 0 1 0 2 0 6,021 0 2,742 491 606 1,686 0 0 363 0 132 0 420,740 5,737 224,086 92,064 19,692 3,085 . . . . . . . . 420,740 451 16,554 2,130 3,370 354 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2018 The river Schelde 21 0 7 8 2 2 1 1 0 0 . . 1,312 0 934 223 16 43 10 86 0 0 . . 86,388 998 37,470 16,798 3,757 530 6,079 1,185 15,123 1,164 15 1,089 12 460 86,388 110 4,013 496 773 120 385 156 2,597 54 6 386 2 234 58,329 0 0 0 5,080 53,249 0 0 0 12,539 0 0 0 1,305 11,233 0 0 0 4,637 631 428 6,253 719 14,882 1,378 22 329 8 293
2019 The river Schelde 20 0 7 7 2 2 0 1 0 0 1 0 1,302 0 919 202 16 43 0 86 0 0 36 0 87,485 1,093 41,674 17,131 3,978 595 . . . . . . . . 87,485 112 4,121 481 826 126 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Source: CBS.
Explanation of symbols

Table description


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 6 April 2021:
The figures of 2019 has been added.
Within the Topics, the underlying breakdown into type of wastewater treatment is expanded with two new types.

When will new figures be published?
New figures on 2020 will be published by March 2022.

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.
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.
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
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.
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