GB 18918-2002 Pollutant Discharge Standard for Urban Wastewater Treatment Plants GB18918-2002 Standard download decompression password: www.bzxz.net

ICS13. 060. 30
National Standard of the People's Republic of China
GB18918—2002
Discharge standard of pollutants for municipal wastewatertreatment plant
Promulgated on December 24, 2002
Implementation on July 1, 2003
State Environmental Protection Administration
General Administration of Quality Supervision, Inspection and Quarantine
GB 18918—2002
This standard is formulated in conjunction with China's "Technical Policy for Urban Wastewater Treatment and Pollution Control" in order to implement the Environmental Protection Law of the People's Republic of China, the Water Pollution Prevention and Control Law of the People's Republic of China, the Marine Environmental Protection Law of the People's Republic of China, the Air Pollution Prevention and Control Law of the People's Republic of China, the Solid Waste Pollution Prevention and Control Law of the People's Republic of my country, promote the construction and management of municipal wastewater treatment plants, strengthen the control of pollutant discharge from municipal wastewater treatment plants and the resource utilization of wastewater, protect human health and maintain a good ecological environment. This standard specifies the control items and standard values ​​of pollutants in the effluent, waste gas and sludge of urban sewage treatment. From the date of implementation of this standard, the discharge of water pollutants, air pollutants and sludge of urban sewage treatment plants shall comply with this standard.
Industrial wastewater and hospital sewage discharged into urban sewage treatment plants shall meet the corresponding specified limits of GB8978 "Comprehensive Sewage Discharge Standard", the national emission standards of relevant industries, the local emission standards and the requirements of local total amount control. This standard is published for the first time.
This standard is proposed by the Science and Technology Standards Department of the State Environmental Protection Administration. This standard is drafted by the Beijing Environmental Protection Science Research Institute and the Chinese Research Academy of Environmental Sciences. This standard was approved by the State Environmental Protection Administration on December 2, 2002. This standard is interpreted by the State Environmental Protection Administration. 334
1 Scope
Pollutant Emission Standard for Urban Sewage Treatment Plants GB 1891B—2002
This standard specifies the pollutant limits for effluent, waste gas emissions and sludge disposal (control) of urban sewage treatment plants. This standard applies to the management of effluent, waste gas emissions and sludge disposal (control) of urban sewage treatment plants. The management of pollutant emissions from independent domestic sewage treatment facilities in residential areas and industrial enterprises shall also be implemented in accordance with this standard. 2 Normative References
The provisions in the following standards become the provisions of this standard through reference in this standard and have the same effect as this standard. GB3838 Surface water environmental quality standard
GB 3097
Seawater quality standard
GB3095 Ambient air quality standard
GB4284 Pollutant control standard for agricultural sludgeGB 8978
Comprehensive sewage discharge standard
Noise standard for industrial enterprise boundary
GB 12318
GB 16297
Comprehensive emission standard for air pollutants
HJ/T55 Technical guide for monitoring unorganized emission of air pollutantsWhen the above standards are revised, the latest version shall be used. 3 Terms and definitions
3.1 Urban sewage refers to urban domestic sewage, drainage from government agencies, schools, hospitals, commercial service agencies and various public facilities, as well as industrial wastewater and initial rainwater allowed to be discharged into urban sewage collection systems. 3.2 Urban sewage treatment plant refers to a sewage treatment plant that purifies sewage entering the urban sewage collection system. 3.3 Enhanced primary treatment Enhanced primary treatment is a treatment process that adds chemical coagulation treatment, mechanical filtration or incomplete biological treatment on the basis of standard primary treatment (gravity sedimentation) to improve the effect of primary treatment.
4 Technical content
4.1 Discharge standard of pollutants
4.1.1 Control items and classification
4.1.1.1 According to the source and nature of pollutants, pollutant control items are divided into basic control items and optional control items. Basic control items mainly include conventional pollutants that affect the water environment and can be removed by general treatment processes of urban sewage treatment plants, as well as some Class I pollutants, a total of 19 items. Optional control items include pollutants that have a long-term impact on the environment or are highly toxic, a total of 43 items. 4.1.1.2 Basic control items must be implemented. The local environmental protection administrative department shall select the control items according to the types of industrial pollutants accepted by the sewage treatment plant and the water environment quality requirements. 335
GB18918—2002
4.1.2 Standard classification
According to the environmental functions and protection targets of urban sewage treatment plants discharged into surface waters, as well as the treatment processes of sewage treatment plants, the standard values ​​of conventional pollutants in basic control items are divided into primary standards, secondary standards, and tertiary standards. --Level standards are further divided into A standards and B standards. Some Class I pollutants and selected control items are not divided. 4.1.2.1 Level A standards of the primary standards are the basic requirements for urban sewage treatment effluent as recycled water. When the effluent of the sewage treatment plant is introduced into rivers and lakes with a small dilution capacity for urban landscape water and general indoor water use, the level A standards of the primary standards shall be implemented. 4.1.2.2 When the effluent of urban sewage treatment plants is discharged into the functional waters of Class IV and V surface waters of GB3838 (except for designated drinking water source protection areas and swimming areas), Class II functional waters of seawater of GB3097, and closed or semi-closed waters such as lakes and reservoirs, the Class B standard of the Class I standard shall be implemented. 4.1.2.3 When the effluent of urban sewage treatment plants is discharged into the functional waters of Class IV and V surface waters of GB3838 or Class III and IV functional waters of seawater of GB3097, the Class II standard shall be implemented.
4.1.2.4 For sewage treatment in established towns in non-key control basins and non-water source protection areas, the Class III standard shall be implemented when the Class I enhanced treatment process is adopted according to local economic conditions and water pollution control requirements, and the location of the Class II treatment facilities must be reserved to reach the Class II standard in stages. 4.1.3 Standard values
4.1.3.1 The basic control items of water pollutant discharge from urban sewage treatment plants shall be implemented in accordance with the provisions of Tables 1 and 2. 4.1.3.2
Select the control items according to the provisions of Table 3. Table 1 Basic control items Maximum allowable emission concentration (daily average) First-level standard
Basic control items Daily
Chemical energy hydrogen content (CCTD)
Biochemical oxygen demand (B) D.)
Environmental substances (SS)
Animal and vegetable oils
Petroleum
Anions and surfactants
Total nitrogen (in √)
Hydrogen and nitrogen (in PT)
20L: 5 years 12 Sichuan 31 before the construction
2006 1H Construction from the 1st
Chroma (exposure multiple)
Strong coliform count/)
A standard
B standard
Unit is mg/1
Secondary standard
25(30)
Third level standard
The removal rate shall be implemented in the following cases: When the inlet water density is greater than 350m/1, the removal rate shall be greater than 60%; when the B ()D is greater than 160mg/L, the removal rate shall be greater than 50%
The values ​​outside the brackets are the control indicators when the water temperature is 12℃; the values ​​inside the brackets are the control indicators when the water temperature is 12℃. 336
Table 2 Maximum allowable emission concentrations of some pollutants (daily average) Item
Mercury
Hexavalent mercury
Selected control items Maximum allowable emission concentrations (daily average) Table 3
Selected control items
Morphine (a) Bi
Volatile phenols
Total chlorinated substances
Sulfides
Anilines
Total nitro compounds
Organophosphorus pesticides (P)
Malathion
Parathion
Dichloromethane
Carbon monoxide
Sampling and on-site testing
4. 1. 4. 1
Standard value
GB 18918—2002
Unit is mg/1
Standard value
Not detectable
Unit is m/L
Select control items
Fluoroethylene
Tetrachloroethylene
Von-xylene
Liu-=,Toluene
\,A
1,4-chlorobenzene
1,2-chlorobenzene
p-nitrochlorobenzene
2,2-Hydroxychlorobenzene
Me-chlorophenol
2.4,8-Trichlorophenol
Dioctyl phthalate
Propylene
Adsorbable organic halides
(AOX)
Standard value
Water quality sampling is carried out at the discharge port at the end of the treatment process of the sewage treatment plant. The discharge port should be equipped with a sewage water volume automatic metering device and an automatic proportional sampling device. The main water quality indicators such as PI, water temperature, C (1) should be installed with online monitoring devices. 4.1.4.2 The sampling frequency is at least once every two hours, and a 24-hour mixed sample is taken, calculated based on the daily average value. The monitoring and analysis methods shall be in accordance with Table 1 or the substitute method or equivalent method approved by the State Environmental Protection Administration. 4.1.4.3
GB18918—2002
Control Items
Chemical Oxygen Demand (COD)
Biochemical Oxygen Demand (BOL)
Suspended Solids (SS)
Animal and Vegetable Oils
Petroleum
Anions and Surfactants
Extra Large Coliform Groups
Alkyl Mercury
Hexavalent Chromium
Table 4 Water pollutant monitoring and analysis methods
Determination methods
Dichromic acid method
Dilution and inoculation method
Weight method
Infrared photometry
Infrared photometry
Methylene blue spectrophotometry
Alkaline potassium persulfate-digestion UV spectrophotometry distillation and titration method
Ammonium aluminate spectrophotometry
Dilution multiple method
Glass electrode method
Multi-tube fermentation method
Cold source electron absorption spectrophotometry|| tt||Dithiol spectrophotometry
Gas chromatography
Atomic absorption spectrophotometry (chelate extraction method) Dithiol spectrophotometry
Potassium permanganate oxidation·phenylcarbohydrazide spectrophotometry Diphenylcarbohydrazide spectrophotometry
Triethyldithiocarbamate silver spectrophotometry Atomic absorption spectrophotometry (chelate extraction method) Dithiol spectrophotometry
Flame atomic absorption spectrophotometry
Diacetyl umbilical spectrophotometry
Activated carbon adsorption of monochrome cyanine S Photometry
Flame atomic absorption spectrophotometry
Pot reagent 2B spectrophotometry
Atomic absorption spectrophotometry
Sodium diethylphenyl diamino formate spectrophotometryAtomic absorption spectrophotometry
Dithiol spectrophotometry
Flame atomic absorption spectrophotometry
Periodic acid spectrophotometry
2,3-Diaminobenzene fluorescence method
Lower limit of determination/(mg/1.)
0. 25 μg/1.
Method source
GB 11914—89
GB7488—87
G 11901—89
GB/T 15488
(GI3/T 16488—1996
GB 7424.-87
GB 11894—89
GB 7478--87
GB 11893—89
GB 11903—89
GB 6920---86
GB 7468-87
GB746987
GB/T 14204-93
GB7475: 87
GB 7471-87
GB7467-87
GB7485-87
GB 747587 | | tt | 7475--87
GB 7472-87
GB 11911—89
Gt 11906—89
GB11902.--89
Controlled items
Benzo[(2-chloro-1-yl)]
Volatile phenol
Total cyanide
Sulfide
Aniline
Total nitro compounds
Organophosphorus pesticides (measured in P)
Malathion
Parathion
Methylparathion
Triazine
Carbon tetrachloride
Trichloroethylene
Tetrachloroethylene
O-dichlorobenzene
P-xylene
M-dimethylbenzene
1.4-Dichlorobenzene
1,2-Diaminobenzene
P-Nitrochlorobenzene
2,4 Dinitrochlorobenzene
m-Cresol
Table 4 (continued)
Determination method
High pressure liquid chromatography
Acetylated filter paper chromatographyFluorescence spectrophotometryFluorescence spectrophotometry of 4-aminoantipyrine after distillationSilver nitrate titration
Isonicotinic acid pyrazoline colorimetry
Pyridine-barbituric acid colorimetry
Methylene blue spectrophotometry Photometry
Direct colorimetric spectrophotometry
Acetyllactone spectrophotometry
N-(2-aminoethyl)amine spectrophotometry Gas chromatography
Gas chromatography
Gas chromatography
Gas chromatography
Gas chromatograph
Gas chromatograph
Gas red T Spectrophotometry
Headspace chromatography
Headspace chromatography
Headspace gas chromatography
Gas chromatography
Gas chromatography
Rainbow chromatography
Gas chromatography
Gas chromatography
Gas chromatography
Gas chromatography
Gas chromatography
Gas chromatography
Gas chromatography
Gas chromatography
Gas chromatography
Liquid chromatography
Lower limit of determination/(mg/L)
0. 001 μg/1
0. 004 μg/L
5 μg/ L ||tt || ug/1.
0. 2 μg/L.
1. 0 μg/L.
0.8 μg/L
GB 189182002
Method source
GB 13198-.91
G13 11895—89
GB 7490--87
GB 7486-87
GB 748687
GB 748687
GB/T16489—1996
GE/T 17133—1997
GK 13197 . -91
GB1188989
GB 4919—85
GB 13192—91
GB13192—91
G3 13192—91
GB 13192—91
GB13102---91
GB 8972—88
GB 980388
GB/T 17130--1997
GB/T17130---1997
GB/T 17130.--1997
GB/T 17130—1997
GR 11890-89
GH 11890 89
GB1189080
GB 1189089
GB118909
GB 1189u89
II/T 74—2001
GB/T17131—1997
GB/ T 17131
Gh 13194-91
GB 13194
GE 18918--2002
Control project
2.4-cyanophenol
2,4,6 Trichlorophenol
Dibutyl phthalate
Dioctyl phthalate
Acrylonitrilebzxz.net
Absorbable organic halides
(AOX)(measured in CI)
4 (continued)
Determination method
Liquid chromatography
Liquid chromatography
Gas, liquid chromatography
Gas chromatography
Microcoulometric method
Ion chromatography
Note: The following method is adopted instead. After the national method standard is issued, the national standard is implemented. The lower limit is set/(mg/L)
1.1 ug/L.
0. 8 μg/ L
10 μg/L
1) "Water and Wastewater Monitoring and Analysis Methods (Edition 1, 4th Edition)", China Environmental Science Press, 4.2 Air Pollutant Emission Standards
4.2.1 Standard Classification
Method Source
[IJ/T 72—2001
H/T 72—2001
HI/T 73--2001
GB/T 15959—1995
HJ/T 83—2001
Based on the air environment quality requirements and air pollutant control technology and facility conditions in the areas where urban sewage treatment plants are located, the standards are divided into three levels.
4. 2. 1. 1
, all (including existing and newly built, rebuilt and expanded) urban sewage treatment plants in the Yan area, from the implementation of this standard located in GR 3095
, the Class 1 standard shall be implemented.
4.2.1.2 Urban sewage treatment plants located in Class II and Class III areas of GB3095 shall implement Class II and Class III standards respectively. Among them, urban sewage treatment plants built (including renovation and expansion) before June 30, 2003 shall implement the standard on January 1, 2006: Urban sewage treatment plants newly built (including renovation and expansion) on July 1, 2003: implementation shall begin from the date of implementation of this standard. 4.2.1.3 Green belts shall be built around newly built (including renovation and expansion) urban sewage treatment plants, and a certain protection distance shall be set. The size of the protection distance shall be determined by the environmental impact assessment.
4.2.2 Standard value
The discharge standard value of urban sewage treatment plant waste shall be implemented in accordance with the provisions of Table 5. Table 5 Maximum allowable concentration of waste gas emissions at the factory boundary (edge ​​of the protection zone) Stock number
Control item
Sulfurization number
Odor concentration (without grass)
Methane (maximum volume fraction in the factory area)/%
4.2.3 Sampling and monitoring
First level standard
Second level standard
Unit: mg/m2
Third level standard
4.2.3.1 Monitoring points for hydrogen, hydrogen sulfide and odor concentrations are set at the highest concentration point at the factory boundary or edge of the protection zone of the urban sewage treatment plant; the methane monitoring point is set at the highest concentration point in the factory area.
4.2.3.2 The layout method of monitoring points and sampling methods shall be implemented in accordance with the relevant provisions of Appendix C of GB 16297 and HJ/T 55. 4.2.3.3 Sampling frequency: sampling once every two hours, a total of 4 times, and the maximum measured value is taken. The monitoring and analysis methods shall be implemented in accordance with Table 6.
Control Item
Hydrogen peroxide
Odor concentration
4.3 Sludge control standard
Table 6 Monitoring and analysis methods for air pollutants
Determination method
Sodium hypochlorite-salicylamide spectrophotometry
Gas chromatography
Three-point comparison odor bag method
Gas chromatography
GB 18918
Method source
GB/T14679-93
GL/1 14678--93
GE/T 14675-93
CI/T 3037-S5
The sludge in urban sewage treatment plants shall be stabilized and shall meet the requirements of Table 7 after stabilization. Table 7 Sludge stabilization control index
Stabilization method
Anaerobic purification
Aerobic digestion
Aerobic composting
Regulations,
Control items
Organic matter degradation rate/%
Organic matter degradation rate/%
Moisture content/%
Organic matter degradation rate/%
Insecticide mortality/%
Fecal coliform bacteria value
Control index
Sludge from urban sewage treatment plants should be dehydrated and buried. The moisture content of the sludge after dehydration should be less than 80%. When the treated sludge is landfilled, it should meet the environmental protection requirements of safe landfill. When the treated sludge is used for agricultural purposes, its pollutant content should meet the requirements of Table 8, and its application conditions must comply with the relevant Table 8 of GB4284. Control standard limit value of pollutants in sludge for agricultural use Project
Petroleum
Benzene(a)
Polychlorinated dioxins/polychlorinated dioxins (PCDD/PCDF unit: ng/kg)
Adsorbable organic halides (AUX) (calculated in CI) Polychlorinated biphenyls (PCH)
Maximum allowable content (calculated in sludge)/(rmg/kg) Acidic soil (pH ≥ 6.5)
Neutral and alkaline soil (pH ≥ 6.5)
GB18918---2002
4.3.5 Sampling and monitoring
4.3.5.1 Sampling method: multi-point sampling is adopted, and the samples should be representative. The sample weight is less than 1kg. The monitoring and analysis methods shall be carried out according to Table 9.
4. 3. 5.2
Table 9 Sludge characteristics and pollutant monitoring and analysis methods No.
Control items
Sludge moisture content
Organic matter
Lizard egg mortality
Escherichia coli group
Benzo(a)
Polychlorinated, benzodioxane
Polychlorinated diphenylfuran
(PCDD/PCDF)
Absorbable organic halides
Polychlorobiphenyls (PCB)
Determination method
Drying method
Chromic acid riveting method
Microscopy method
Fermentation method
Graphite furnace atomic absorption spectrophotometry
Cold atomic absorption spectrophotometry
Graphite furnace atomic absorption spectrophotometry
Fire-roasted atomic absorption spectrophotometry
Potassium hydride-silver nitrate spectrophotometry
Curcumin colorimetry
Infrared spectrophotometry
Gas chromatography
Flame atomic absorption spectrophotometry
Flame atomic absorption spectrophotometry
Flame atomic absorption spectrophotometry
Isotope dilution high resolution capillary
Gas chromatography/high resolution mass spectrometry
Gas chromatography
Note: The following methods are temporarily adopted. After the national method standard is issued, the national standard shall be implemented. 1) Monitoring and analysis method for urban garbage for agricultural use\. 2) "Monitoring and analysis method for agricultural sludge". 4.4 Noise control in urban sewage treatment plants shall be carried out in accordance with GB12348. Source of method
GB 7959--87
GB 7959--87
GB/T 17141—1997
GB/T 17136—1997
GB/T 17141-1997
GB/T17137—1997
GB/T 17135—1997
GB/T 17138-:1997
GB/T 17138—1997
GR/T 17139—1997
HJ/T 77---2001
4.5 The construction (including modification and expansion) time of urban sewage treatment plants shall be based on the time of approval of the environmental impact assessment report. 5 Other provisions
When the effluent from urban sewage treatment plants is used as water resources for different purposes such as agriculture, industry, municipal administration, and groundwater recharge, it shall also meet the corresponding water quality requirements and shall not cause adverse effects on human health and the ecological environment. 342
6 Implementation and supervision of standards
GB189182002
6.1 When this standard is issued, the environmental protection administrative department of the people's government at or above the county level shall be responsible for supervising the implementation. 6.2 When the people's governments of provinces, autonomous regions, and municipalities directly under the central government cannot meet the environmental function requirements of the region by implementing the national pollutant emission standards, they may formulate local pollutant emission modification standards that are stricter than this standard based on the total amount control requirements and the results of environmental impact assessment, and report them to the national environmental protection administrative department for filing.
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