GB 18486-2001 Pollution Control Standard for Sewage Marine Disposal Projects GB18486-2001 Standard download decompression password: www.bzxz.net

ICS 13. 030. 01wwW.bzxz.Net
National Standard of the People's Republic of China
GB18486—2001
Replaces GWKB4---2000
Standard for pollution control of sewage marine disposal engineeringIssued on November 12, 2001
Implementation on January 1, 2002
State Environmental Protection Administration
General Administration of Quality Supervision, Inspection and Quarantine
GB 18486—2001
This standard is formulated to implement the Environmental Protection Law of the People's Republic of China and the Marine Environment Protection Law of the People's Republic of China, to standardize the planning, design, construction and operation management of sewage marine disposal projects, to ensure the prevention and control of marine pollution, the protection of marine resources, the maintenance of sustainable utilization of the ocean, the maintenance of marine ecological balance and the protection of human health while making rational use of the natural purification capacity of the ocean. This standard specifies the emission concentration limits, initial dilution, mixing zone range and other general provisions of major water pollutants in sewage marine disposal projects.
The content of this standard (including the implementation date) is equivalent to the "Pollution Control Standard for Sewage Marine Disposal Projects" (GWKB4-2000) issued by the State Environmental Protection Administration on February 29, 2000. From the date of implementation of this standard, it will replace GWKB4-2000. The "Surface Water Environmental Quality Standard" (GB3838-1988) is being revised. Before the revised draft of GB3838-1988 is issued, the referenced standards of this standard shall temporarily implement the "Surface Water Environmental Quality Standard" (GHZB1-1999). This standard shall be interpreted by the State Environmental Protection Administration. 756
1 Subject matter and scope of application
1.1 Subject matter
Pollution control standard for sewage marine disposal projects GB 18486-2001
This standard specifies the discharge concentration limits, initial dilution, mixing zone range and other general provisions for sewage marine disposal projects.
1.2 Scope of application
This standard applies to all sewage marine disposal projects that use discharge pipes and underwater diffusers to discharge sewage (excluding warm drainage) into the sea or into estuarine waters with an annual probability of salinity greater than 5% and greater than 10% at the discharge point. 2 Cited standards
The provisions contained in the following standards, when cited in this standard, constitute the provisions of this standard. GB3097-1997 Seawater Quality Standard
GB8978-1996 Comprehensive Sewage Discharge Standard
GHZB1-1999 Surface Water Environmental Quality Standard When the above standards are revised, the latest version shall be used. 3 Definitions
3.1 Sewage Diffuser
A facility that sets multiple outlets along the pipeline axis to disperse and discharge sewage from underwater is called a sewage diffuser. Its shapes include linear, L-shaped and Y-shaped.
3.2 Drainage Pipe
The pipeline or tunnel that transports sewage from the onshore sewage treatment facility to the diffuser is called a drainage pipe. Large drainage pipes are generally equipped with vertical shafts on the shore.
3.3 Sewage Marine Disposal
The drainage pipe plus the sewage diffuser is collectively called the sewage drainage system; the sewage discharged from the onshore treatment facility through the drainage system from underwater to the ocean is called sewage marine disposal.
3.4 ​​Initial dilution
After the sewage is discharged from the diffuser, it mixes with the ambient water and is diluted under the action of the momentum and buoyancy of the outlet. The multiple of sewage dilution when the momentum and buoyancy of the outlet are basically completed is called the initial dilution. 3.5 Mixing zone
When sewage is continuously discharged from the diffuser, the superposition (i.e., envelope) of the plane ranges that cause the concentration of pollutants in the nearby waters to exceed the target limit of the water quality of the waters at each instant is called the mixing zone. 3.6 Daily allowable discharge efficiency of pollutants
Refers to the total daily allowable discharge of each pollutant covered by this standard through the sewage marine disposal project. 757
GB 18486
4 Technical content
4.1 Standard value
The daily average concentration of water pollutants entering the discharge pipe must meet the requirements of Table 1. Items not listed in Table 1 may refer to GB8978-1996 for implementation. Table 1 Discharge concentration limits of major water pollutants in sewage marine disposal projects No. pH (unit) Suspended solids (SS) Total α radioactivity (Bq/L) Total β radioactivity (Bg/L) Coliform bacteria (pieces/ml.) Pollutant items Fecal coliform bacteria (pieces/ml.) Biochemical oxygen demand (BODs) Chemical oxygen demand (CODcr) Petroleum Animal and plant oils Volatile Volatile phenol
Total cyanide
Sulfide
Fluoride
Inorganic nitrogen
Benzo(a) fluorine (μg/L)
Organophosphorus pesticides (in terms of P)
Benzene series
Standard value
Unit: mg/L
Chlorobenzenes
Anilines
Nitrobenzenes
Acrylonitrile
Pollutant items
Anionic surfactants (LAS)
Total organic carbon (TOC)
4.2 Provisions for initial dilution
Table 1 (end)
GB 18486—2001
Standard value
The selection of discharge point for marine sewage disposal and the design of discharge system shall ensure that the initial dilution meets the initial dilution requirements specified in Table 2 at a time guarantee rate of 90% of the year.
Table 2 Initial dilution requirements at a time guarantee rate of 90% Discharge water area
Water quality category
Initial dilution ≥
Class III
Class IV
Estuarine waters classified as surface water
Note: For the case of setting up marine sewage disposal discharge point in a certain range in Class II sea area with special approval, the initial dilution shall be ≥55 at a 90% guarantee rate. 4.3 Mixing zone regulations
The mixing zone regulations for pollutants in marine sewage disposal projects are as follows: If sewage is discharged to open sea or bays and wide estuaries with an area of ​​≥600km2 (based on the theoretical depth datum), the allowed mixing zone range is: A≤3. 0km2.
If sewage is discharged to a bay of <600km2, the area of ​​the mixing zone must be less than the smaller of the allowable values ​​(A.) calculated by the following two methods:
(-)A.=2400(L+200)(m2)
Where: L--diffuser length, m.
(II) A = 200
X106(m2)
Where: A.
Calculate the bay area to the bay mouth, m2. For key sea areas and sensitive sea areas, the water flow exchange conditions and marine aquatic ecology of the sea area where the discharge point is located must also be considered when delineating the mixing zone of pollutants in the sewage marine disposal project. 4.4 General provisions
4.4.1 The discharge point of sewage marine disposal must be selected in the sea area that is conducive to the transfer and diffusion of pollutants to the open sea, and avoid eddies and wave breaking zones caused by specific terrain such as corners.
4.4.2 The location of the sewage marine disposal discharge point shall not affect the fish migration channel and the use function of the adjacent functional area outside the mixing zone. In the estuary area, the lateral width of the mixing zone shall not exceed 1/4 of the width of the estuary. 4.4.3 The diffuser must be laid at the bottom of the water with a depth of at least 7m at any time of the year, and its starting point must be at least 200m away from the low tide line. 4.4.4 The water quality conditions of the sea area where the discharge point is located, the requirements of the functional area and other surrounding emission sources must be comprehensively considered to calculate the allowable discharge of each type of pollutant listed in Table 1. For key sea areas where total pollutant emission control is implemented, when determining the allowable discharge of pollutants for sewage marine disposal projects, the total pollutant emission control indicators of the sea area should be considered. 4.4.5 Sewage must undergo at least one level of treatment before being discharged through the discharge system. 4.4.6 Sewage marine disposal shall not lead to degradation and change of the biological community structure outside the mixing zone of the receiving water area. 759
GB 18486—2001
4.4.7 The marine disposal of sewage shall not lead to the accumulation of toxic substances in the sediments or organisms in the sewage receiving area to a harmful level. 5 Monitoring
5.1 Sewage monitoring
5.1.1 Sampling point: The water quality monitoring of sewage entering the discharge pipe is sampled at the outlet of the onshore treatment facility or in the vertical pipe. 5.1.2 Sampling frequency: The measured water pollutant discharge concentration is calculated according to the daily average value. Each monitoring shall be sampled continuously for 24 hours, and a sample shall be collected every 4 hours. 5.1.3 Sewage sampling monitoring shall be carried out in accordance with the method specified in the "Comprehensive Sewage Discharge Standard". 5.2 Initial dilution and mixing zone monitoring
5.2.1 Initial dilution: According to the water flow conditions at each sampling time, appropriate sampling points are arranged around the outlet along the diffuser axis for monitoring, and the initial dilution at that time is calculated by taking the average of the monitoring values ​​at each point at the same time. Each monitoring time must cover at least one tidal cycle, and sampling shall be carried out at least 8 times at equal time intervals.
5.2.2 Mixing zone: Sampling and monitoring points are reasonably arranged according to the specific hydrological conditions at the discharge point. Each point must take upper, middle and lower mixed samples. Each monitoring sampling time must cover at least one tidal cycle, and the sampling time should capture specific water flow conditions such as high tide, low tide, rapid rise and fall. 5.2.3 Seawater sample monitoring shall be carried out in accordance with the method specified in GB3097. 6 Standard Implementation Supervision
6.1 The environmental protection administrative department of the people's government at or above the county level shall be responsible for supervising the implementation of this standard. 6.2 The people's governments of coastal provinces, autonomous regions and municipalities directly under the central government may formulate local pollution control standards for sewage marine disposal projects according to local actual needs and report them to the national environmental protection administrative department for filing.
Tip: This standard content only shows part of the intercepted content of the complete standard. If you need the complete standard, please go to the top to download the complete standard document for free.