Urban waste water treatment per province and river basin district

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 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)
Nederland 2019 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 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Noord-Nederland (LD) 2019 61 1 9 10 5 29 1 2 2 1 0 1 3,413 54 651 419 81 1,454 40 186 97 91 0 340 214,677 2,636 102,826 42,583 9,083 1,317 . . . . . . . . 214,677 231 9,120 898 1,238 176 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Oost-Nederland (LD) 2019 85 0 13 15 21 24 0 3 6 0 2 1 6,781 0 1,952 1,842 358 2,139 0 185 211 0 72 23 364,696 6,182 244,498 96,463 20,848 3,042 . . . . . . . . 364,696 395 14,064 1,249 2,763 412 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
West-Nederland (LD) 2019 121 1 21 28 6 53 0 6 4 0 2 0 13,215 54 4,348 2,113 98 4,611 0 683 841 0 468 0 874,254 11,157 413,810 189,963 43,178 5,855 . . . . . . . . 874,254 896 31,719 3,327 6,662 744 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Zuid-Nederland (LD) 2019 50 0 16 6 14 11 0 0 1 0 2 0 6,374 0 3,214 507 615 1,543 0 0 363 0 132 0 450,475 6,170 241,356 98,957 21,100 3,341 . . . . . . . . 450,475 497 18,392 2,291 3,729 435 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Groningen (PV) 2019 22 0 4 4 2 8 1 1 1 0 0 1 1,017 0 180 110 13 260 40 17 56 0 0 340 70,320 802 31,655 13,349 2,686 373 . . . . . . . . 70,320 81 3,259 373 472 55 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Fryslân (PV) 2019 27 1 0 4 1 19 0 0 1 1 0 0 1,380 54 0 214 16 964 0 0 41 91 0 0 88,865 1,031 38,983 15,839 3,823 550 . . . . . . . . 88,865 89 3,639 282 416 73 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Drenthe (PV) 2019 12 0 5 2 2 2 0 1 0 0 0 0 1,016 0 471 95 51 230 0 169 0 0 0 0 55,492 803 32,189 13,395 2,574 393 . . . . . . . . 55,492 61 2,222 243 349 48 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Overijssel (PV) 2019 32 0 9 6 8 2 0 1 5 0 0 1 2,228 0 929 632 219 218 0 21 186 0 0 23 114,022 1,958 77,990 30,270 6,386 1,024 . . . . . . . . 114,022 129 4,866 414 886 132 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Flevoland (PV) 2019 5 0 0 2 0 3 0 0 0 0 0 0 754 0 0 197 0 558 0 0 0 0 0 0 28,069 645 25,553 10,559 2,353 334 . . . . . . . . 28,069 27 1,021 76 169 21 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Gelderland (PV) 2019 48 0 4 7 13 19 0 2 1 0 2 0 3,799 0 1,023 1,013 139 1,363 0 164 25 0 72 0 222,605 3,579 140,954 55,635 12,109 1,685 . . . . . . . . 222,605 239 8,177 759 1,708 259 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Utrecht (PV) 2019 22 0 3 4 0 13 0 0 1 0 1 0 2,075 0 185 108 0 1,330 0 0 19 0 432 0 120,892 1,816 70,482 29,234 6,336 835 . . . . . . . . 120,892 105 3,813 360 821 76 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Noord-Holland (PV) 2019 30 1 8 5 3 8 0 3 2 0 0 0 4,585 54 1,930 1,033 82 795 0 433 258 0 0 0 286,146 3,486 120,925 67,986 15,345 2,057 . . . . . . . . 286,146 326 11,372 1,158 2,246 239 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Zuid-Holland (PV) 2019 54 0 4 14 3 30 0 2 1 0 0 0 5,757 0 1,784 786 16 2,443 0 163 564 0 0 0 419,105 5,304 202,200 84,294 19,321 2,679 . . . . . . . . 419,105 406 14,498 1,514 3,169 390 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Zeeland (PV) 2019 15 0 6 5 0 2 0 1 0 0 1 0 799 0 448 186 0 43 0 86 0 0 36 0 48,112 551 20,203 8,449 2,177 284 . . . . . . . . 48,112 59 2,037 295 427 38 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Noord-Brabant (PV) 2019 33 0 10 3 14 5 0 0 1 0 0 0 4,342 0 2,664 80 615 620 0 0 363 0 0 0 306,730 4,370 171,775 71,659 14,764 2,532 . . . . . . . . 306,730 323 12,020 1,250 2,451 321 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Limburg (PV) 2019 17 0 6 3 0 6 0 0 0 0 2 0 2,032 0 550 427 0 922 0 0 0 0 132 0 143,745 1,800 69,581 27,298 6,336 809 . . . . . . . . 143,745 173 6,372 1,041 1,278 114 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
The river Eems 2019 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 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
The river Rijn (North Rijn) 2019 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 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
The river Rijn (East Rijn) 2019 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 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
The river Rijn (Central Rijn) 2019
The river Rijn (West Rijn) 2019 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 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
The river Maas 2019 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 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
The river Schelde 2019 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