GB 39731-2020Discharge standard of water pollutants for electronic industry (English PDF)

3.5 Semiconductor device

Electronic devices with specific functions, which are manufactured using the special

electrical properties of semiconductor materials. It includes two major categories of

products. discrete devices and integrated circuits.

3.6 Display device

Device that presents information for visual perception based on electronic means. It

includes thin film transistor liquid crystal display devices, low-temperature

polycrystalline silicon thin film transistor liquid crystal display devices, organic

light-emitting diode display devices, vacuum fluorescent display devices, field

discharge display devices, plasma display devices, curved display devices, flexible

display devices.

3.7 Photoelectronic device

Various functional devices made using the semiconductor light-electron (or electric-

photon) conversion effect. It includes light-emitting diodes; photoelectric converters

and photodetectors in semiconductor optoelectronic devices; gas laser devices,

semiconductor laser devices, solid-state laser devices, electrostatic induction

devices in laser devices; optical communication circuits and other devices;

semiconductor lighting devices, etc.

3.8 Electronic terminal product

Electronic products or components with independent application functions, which

are assembled based on printed circuit board assembly technology. It includes

communication equipment, radar equipment, radio and television equipment,

electronic computers, audio-visual equipment, etc.

3.9 Existing facility

Electronic industrial enterprises, production facilities or research and development

lines that have been completed and put into production or whose environmental

impact assessment documents have been approved before the implementation of this

standard, as well as centralized sewage treatment facilities for the electronic industry.

3.10 New facility

New, rebuilt, expanded electronic industry or electronic industrial sewage treatment

facility construction projects whose environmental impact assessment documents

have been approved since the implementation of this standard.

3.11 Direct discharge

The act of a pollutant discharger directly discharging water pollutants into

environmental water bodies.

3.12 Indirect discharge

The act of a pollutant discharger discharging water pollutants into centralized

sewage treatment facilities.

3.13 Concentrated wastewater treatment facilities

Wastewater treatment facilities that provide wastewater treatment services for two

or more pollutant dischargers, including urban wastewater treatment facilities of

various sizes and types, centralized wastewater treatment facilities of industrial

agglomeration areas (economic and technological development zones, high-tech

industrial development zones, export processing zones and other industrial parks),

as well as other wastewater treatment facilities shared by two or more pollutant

dischargers.

3.14 Concentrated wastewater treatment facilities for electronic industry

Wastewater treatment facilities that provide wastewater treatment services

specifically for two or more electronic industry pollutant dischargers.

3.15 Effluent volume

The amount of wastewater discharged by an enterprise or production facility outside

the legal boundaries of the enterprise, including various types of effluents that are

directly or indirectly related to production (including domestic sewage, cooling

sewage, boiler drainage in the plant area, etc.).

3.16 Benchmark effluent volume per unit product

The upper limit of the effluent volume per unit product, which is used to determine

the concentration of water pollutants discharged.

3.17 Dilution level

The reciprocal of the total volume fraction of the original water sample after dilution,

generally expressed as D. For example, if the water sample is not diluted, the dilution

level D = 1; if 250 ml of the water sample is diluted to 1000 ml (i.e., the volume

fraction is 25%), the dilution level D = 4.

3.18 Lowest ineffective dilution

When the production facilities of an enterprise produce more than two products at the

same time, different discharge control requirements or national pollutant discharge

standards for different industries may be applied. When the wastewater generated by

the production facilities is treated and discharged in a mixed manner, the most stringent

concentration limit specified in the discharge standard shall be implemented,

meanwhile converted into the benchmark discharge volume concentration of water

pollutants according to formula (1).

C benchmark = (Q total / sumYiQi benchmark) x C measured (1)

Where.

C benchmark - Water pollutant benchmark discharge concentration, mg/L;

Q total - Measured total discharge, m3;

Yi - The i-th product output, see Table 2 for units;

Qi benchmark - The unit product benchmark discharge of the i-th product, see Table 2

for units;

C measured - The measured water pollutant discharge concentration, mg/L.

If the ratio of Q total to sumYiQi benchmark is less than 1, the measured concentration of water

pollutants is used as the basis for determining whether the discharge meets the standard.

5.1 Enterprises shall establish an enterprise environmental monitoring system and

formulate monitoring plans, in accordance with relevant laws and regulations such as

the "Environmental Monitoring Management Measures"; conduct self-monitoring of

pollutant discharges and their impact on the surrounding environment as required; keep

original monitoring records. For petroleum, total nitrogen, anionic surfactants, total

organic carbon, sulfides, the self-monitoring frequency of key pollutant discharge

organizations shall be at least once a month; the other pollutant discharge organizations

shall be at least once a year.

5.2 The requirements for new and existing facilities to install automatic monitoring

equipment for pollutant discharges shall be implemented, in accordance with relevant

laws and the "Measures for the Administration of Automatic Monitoring of Pollution

Sources". Key pollutant-discharging organizations shall install automatic monitoring

equipment for key water pollutant discharges; connect them to the monitoring

equipment of the ecological and environmental authorities; ensure the normal operation

of the monitoring equipment.

5.3 The setting of monitoring sampling points and sampling methods for water

6.1 The setting of sewage outlets and sampling points shall comply with the provisions

of HJ 91.1.

6.2 In accordance with the relevant provisions of GB 15562.1 and the "Notice on

Issuing the Technical Specifications of Discharge Outlet Signs", warning sewage outlet

signs shall be set up in conspicuous places near sewage outlets or sampling points and

retained for a long time.

7.1 The ecological environment authorities at or above the county level are responsible

for supervising the implementation of this standard.

7.2 Enterprises are the responsible entities for implementing discharge standards. Under

any circumstances, enterprises shall comply with the pollutant discharge control

requirements specified in this standard and take necessary measures to ensure the

normal operation of pollution prevention and control facilities. When conducting law

enforcement inspections on enterprises, the ecological and environmental authorities at

all levels can use the results of on-site real-time sampling or monitoring as the basis for

determining whether the discharge behavior complies with the discharge standards and

implementing relevant ecological and environmental protection management measures.

7.3 Key pollutant-discharging organizations shall set up electronic display screens at

locations such as the factory gate where the public can easily supervise; publish online

monitoring data of water pollutants and other environmental information to the public

in real time, in accordance with the "Measures for the Disclosure of Environmental

Information of Enterprises and Institutions".

7.4 Metering devices, monitoring devices, signboards, environmental information

disclosure facilities, etc. related to sewage discharge outlets shall be supervised and

managed as ecological and environmental protection facilities. Enterprises shall

establish special management systems and arrange special personnel to carry out

construction, management, and maintenance. No organization shall dismantle, move or

modify them without authorization.

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