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All the technical contents of this standard are mandatory.
This standard is a revision of DB 4426-1989 Discharge Standard of Water Pollutants.
The following main changes have been made with respect to DB 4426-1989:
——It is prepared according to the requirements of GB/T 1.1-2000;
——The application scope is defined;
——Terms and definitions are added;
——Control area division and standard grading are adjusted;
——The year limit is adopted;
——In the first period, 16 new control items are added. The standard values of the former items are basically maintained at the Grades I and II standard values in the former standard; in the second period, 46 new control items are added, and chromaticity, suspended substance, biochemical oxygen demand, chemical oxygen demand, and the maximum allowable discharge concentration of petroleum, animal and vegetable oil, ammonia, nitrogen and the like are limited strictly as appropriate;
——Supporting monitoring requirements and analysis methods are provided.
Annexes A, B and C of this standard are normative.
This standard was proposed by the Department of Environmental Protection of Guangdong Province.
This standard was approved by People's Government of Guangdong Province.
This standard was firstly issued in 1989 and is revised for the first time.
Introduction
This standard is formulated in accordance with Environmental Protection Law of the People's Republic of China, Law of the People's Republic of China on Prevention and Control of Water Pollution, Marine Environment Protection Law of the People's Republic of China and relevant regulations, also in combination with actual conditions in Guangdong Province, with the aim to control water pollution, protect water quality, guarantee human health, maintain ecological balance and promote the economic and social development.
This standard replaces DB 4426-1989 Discharge Standard of Water Pollutants.
DB 4426-1989 is abolished from the implementation date of this standard.
Discharge Limits of Water Pollutants
1 Scope
This standard specifies the discharge limits of 74 kinds of water pollutants in different years, and specifies the various requirements in the executive standards.
This standard is applicable to the discharge control for the water pollutants from existing units, environmental impact assessment for construction projects, and design, completion acceptance and discharge control after commissioning for the construction projects beyond ships, shipping industry, marine petroleum exploitation industry, space propellant application, ordnance industry, and wastewater ocean disposal project, etc.
2 Normative References
The following normative documents contain provisions which, through reference in this text, constitute provisions of this standard. For dated reference, subsequent amendments (excluding corrections) to, or revisions of, any of these publications do not apply. However, parties to agreements based on this standard are encouraged to investigate the possibility of applying the most recent editions of the standards indicated below. For undated references, the latest edition applies.
GB 3097 Marine Water Quality Standard
GB 8703 Regulations for Radiation Protection
GB 12997 Water Quality — Technical Regulation on the Design of Sampling Programmes
GB 12999 Water Quality Sampling — Technical Regulation of the Preservation and Handling of Samples
GHZB 1 Environmental Quality Standards for Surface Water
Monitoring Technical Specification on Completion Acceptance of Environment Protection Facilities for Construction Project (Trial)
83 Monitoring and Analysis Methods for 74 Items (see Table 6).
3 Terms and Definitions
For the purposes of this standard, the following terms and definitions apply.
3.1
wastewater
general term for water discharged during production, operation and living activities.
3.2
drainage volume
discharge amount of water that is directly used in process production during the production process.
Note: Drainage volume does not include indirect cooling water and water discharged from plant boilers and power station.
3.3
all discharge units
all pollutant discharging units within the application scope of this standard.
3.4
other discharge units
all pollutant discharging units within a specific control item beyond the listed industries.
4 Technical Content
4.1 Control Area Division and Standard Grading
4.1.1 Control area division
According to GHZB 1 and GB 3097, waters and seas throughout the province are divided into the following three classes of control areas:
a) Special control area: Classes I and II waters and protected areas and swimming areas in Class III waters in GHZB 1, and Class I seas in GB 3097;
b) Class I control area: Class III waters (except for designated protected areas and swimming areas) in GHZB 1 and Class II seas in GB 3097;
c) Class II control area: Classes IV and V waters in GHZB 1 and Classes III and IV seas in GB 3097.
4.1.2 Standard grading
4.1.2.1 New drain outlets are prohibited in the special control are. The existing drain outlets shall conform to Grade I standard, the total discharge amount of pollutants from which shall not be increased.
4.1.2.2 Wastewater discharged into Class I control area shall be subject to Grade I standard.
4.1.2.3 Wastewater discharged into Class II control area shall be subject to Grade II standard.
4.1.2.4 Each control area shall conform to the standard at corresponding grade. When the receiving water does not meet the functional water quality requirements, the drain outlet shall be subject to control on the total discharge amount of water pollutants, so as to meet the functional water quality standards.
4.1.2.5 Wastewater discharged into the urban secondary wastewater treatment plant that is completed and put into operation shall be subject to Grade III standard.
4.1.2.6 Wastewater discharged into the urban drainage system of the secondary wastewater treatment plant that is not established or not put into operation shall be subject to 4.1.2.1, 4.1.2.2, 4.1.2.3 and 4.1.2.4 respectively according to the functional requirements of the drainage water receiving waters and seas.
4.2 Pollutant Classification and Standard Values
4.2.1 Classification of pollutants
4.2.1.1 Class I pollutants refer to hazardous substances that can accumulate in the water environment or in animals and plants, resulting in long-term adverse effects on human health.
4.2.1.2 Class II pollutants refer to hazardous substances whose long-term effects are less than those of Class I pollutants.
4.2.2 Standard values
4.2.2.1 According to the construction time, the construction project shall conform to the following requirements with regard to the discharge of water pollutants and the maximum allowable drainage volume of some industries:
a) For projects constructed before January 1, 2002, the discharge of water pollutants and the maximum allowable drainage volume of some industries shall be subject to the standard values of the first period, that is, the limits specified in Tables 1, 2 and 3.
b) For projects constructed from January 1, 2002, the discharge of water pollutants and the maximum allowable drainage volume of some industries shall be subject to the standard values of the second period, that is, the limits specified in Tables 1, 4 and 5.
4.2.2.2 The construction time of the construction project shall be based on the date of approval in the environmental impact report, report form and registration form.
4.3 Others
4.3.1 When two or more different types of wastewater with different discharge limits are discharged from the same discharge outlet, the discharge limit of the combined wastewater is calculated according to Annex A.
4.3.2 The maximum allowable discharge load of industrial wastewater pollutants is calculated according to Annex B.
4.3.3 The maximum allowable annual discharge of pollutants is calculated according to Annex C.
4.3.4 For the discharge of wastewater containing radioactive materials, in addition to this standard, it shall also comply with the requirements of GB 8703.
5 Monitoring
5.1 Sampling Point
5.1.1 Wastewater containing Class I pollutants, regardless of the industry and wastewater discharge mode, and the functional category of the receiving water, shall be sampled at the discharge outlet of the workshop or workshop processing facility.
5.1.2 Wastewater containing Class II pollutants shall be sampled at the discharge outlet of the discharge unit.
5.1.3 A discharge outlet mark, a wastewater water metering device and a wastewater proportional sampling device shall be provided at the discharge outlet.
5.2 Sampling Frequency
5.2.1 The monitoring frequency for the completion acceptance of the environment protection facilities in construction projects shall comply with Supervisory Technical Specification on Completion Acceptance of Environment Protection Facilities for Construction Project (Trial) developed by the Ministry of Ecology and Environment of the People’s Republic of China.
5.2.2 Conventional monitoring frequency of industrial wastewater shall be determined according to the production cycle. If the production cycle is within 8 hours, the sampling frequency is once every 2 hours; if the production cycle is greater than 8 hours, the sampling frequency is once every 4 hours. Other wastewater sampling: not less than twice every 24 hours. The maximum allowable discharge concentration is calculated as the daily mean.
5.2.3 In the case of supervision and management and pollution charge monitoring by the environmental protection department, samples can be randomly taken according to the actual situation, and the maximum allowable discharge concentration is calculated as the momentary concentration.
Foreword i
Introduction ii
1 Scope
2 Normative References
3 Terms and Definitions
4 Technical Content
4.1 Control Area Division and Standard Grading
4.2 Pollutant Classification and Standard Values
4.3 Others
5 Monitoring
5.1 Sampling Point
5.2 Sampling Frequency
5.3 Sample Collection and Storage
5.4 Drainage Volume
5.5 Statistics
5.6 Analysis Methods
6 Standard Implementation
Annex A (Normative) Calculation of Combined Discharge Concentration Limit
Annex B (Normative) Calculation of Maximum Allowable Discharge Load of Pollutant
Annex C (Normative) Calculation of Maximum Allowable Annual Discharge Volume of Pollutant
