HJ 984-2018Technical guidelines of accounting method for pollution source intensity electroplating industry (English PDF)

4.1 General principles

The strong source accounting procedures include pollution source identification and pollutant determination, accounting method and parameter selection, source strength accounting, and accounting results.

For details, see HJ 884 for details.

4.2 Identification of pollution sources

Electroplating source identification should cover all sites, equipment or devices that may generate exhaust, wastewater, noise, solid waste contaminants, See Table 1.

The identification of pollution sources shall comply with the technical guidelines of HJ 2.1, HJ 2.2, HJ 2.3, HJ 2.4 and so on.

4.3 Determination of pollutants

The determination of electroplating pollutants of various pollution sources shall include pollutants in national and local emission standards such as GB 21900, as shown in Table 1. Correct Contaminants that may be produced in the production process but not included in national or local pollutant discharge standards may be based on environmental quality standards and other industries.

Environmental quality improvement requirements of standards, local people's governments or ecological environment authorities, based on raw and auxiliary materials and fuel use and production processes Analyze and determine.

4.4 Accounting method selection

The methods of calculating the source of electroplating pollution include the actual measurement method, the analogy method, the material balance algorithm and the pollution yield coefficient method.

Table 1. The source strength accounting method should be selected in order. If the priority method cannot be adopted, reasonable reasons should be given.

Table 1 Selection table of strong accounting methods for electroplating pollution sources

Elemental pollution source/discharge pollutant project Accounting method and prioritization New (reform, expansion) Engineering pollution source Existing engineering Pollution source a Organized waste Workshop or production facility Exhaust Hydrogen chloride, sulfuric acid mist, chromic acid mist, cyanide, nitrogen oxides, fluorine Compound Analogy method 2. Pollution coefficient method Actual measurement method Unorganized waste Electroplating production site Hydrogen chloride, sulfuric acid mist, chromic acid mist, cyanide, nitrogen oxides, fluorine Compound Analogy method Waste water Production unit outlet Chemical oxygen demand, suspended solids, petroleum, fluoride, total nitrogen, ammonia Nitrogen, total phosphorus, total iron, total aluminum Analogy method Total cyanide, total copper, total zinc, total lead, total mercury, total chromium, hexavalent Chromium, total cadmium, total nickel, total silver Analogy method 2. Material balance algorithm Actual measurement method 2. Material balance algorithm Workshop or production facility Wastewater discharge Total chromium, hexavalent chromium, total nickel, total cadmium, total silver, total lead, total mercury Analogy method 2. Pollution coefficient method Actual measurement method Total wastewater discharge from enterprises Total copper, total zinc, total iron, total aluminum, suspended solids, chemical oxygen demand, Ammonia nitrogen, total nitrogen, total phosphorus, petroleum, fluoride, total cyanide Analogy method 2. Pollution coefficient method Actual measurement method Noise-high noise equipment equivalent continuous A sound level 1. Analogy method Actual measurement method 2. Analogy Solid waste electroplating wastewater treatment sludge, waste tank liquid, slag, plating material packaging, filter material, etc.

Analogy method

2. Material balance algorithm Actual measurement method 2. Material balance algorithm

Note 1. The outlet of the production unit refers to the pre-treatment tank, the plating treatment tank, the post-treatment tank and the water outlet of each washing tank.

Note 2. For the centralized sewage treatment plant workshop or production facility discharge that specializes in electroplating wastewater, it refers to the specific treatment of the first type of pollutant wastewater.

The water outlet of the unit (before the wastewater containing the first type of pollutants is mixed with other wastewater).

a The existing project pollution source is not in accordance with the relevant management requirements for manual monitoring, installation of automatic pollutant monitoring equipment or automatic monitoring equipment does not meet the requirements, the ring in the process of environmental impact assessment management, it shall be accounted for according to the method in this table after rectification according to law; in the process of sewage permit management, nuclear shall be carried out in accordance with the relevant provisions of the pollutant discharge permit.

Count.

4.4.1 Exhaust gas

4.4.1.1 New (reconstruction, expansion) construction project pollution source

The pollution factors of the organized exhaust gas are preferably accounted for by the analogy method, and the second is calculated by the pollution yield coefficient method.

The pollution factors of unorganized exhaust gas are accounted for by the analogy method.

4.4.1.2 Existing engineering pollution sources

The pollution factors of organized exhaust gas are calculated by the actual measurement method.

The pollution factors of unorganized exhaust gas are accounted for by the analogy method.

4.4.2 Waste water

4.4.2.1 New (reconstruction, expansion) construction project pollution source

For the production plant outlet, chemical oxygen demand, suspended solids, petroleum, fluoride, total nitrogen, ammonia nitrogen, total phosphorus, total iron, total aluminum mining Calculated by analogy; total cyanide, total copper, total zinc, total lead, total mercury, total chromium, hexavalent chromium, total cadmium, total nickel, total silver are preferably used in analogy Method accounting, followed by material balance algorithm accounting.

For total corporate wastewater discharge, total copper, total zinc, total iron, total aluminum, suspended solids, chemical oxygen demand, ammonia nitrogen, total nitrogen, total phosphorus, stone Oils, fluorides and total cyanide are preferentially accounted for by the analogy method, followed by the pollution coefficient method.

For the wastewater discharge from the workshop or production facility, the total chromium, hexavalent chromium, total nickel, total cadmium, total silver, total lead, and total mercury are preferably used in analogy.

Accounting, followed by accounting for the pollution coefficient method.

4.4.2.2 Existing engineering pollution sources

For the production plant outlet, chemical oxygen demand, suspended solids, petroleum, fluoride, total nitrogen, ammonia nitrogen, total phosphorus, total iron, total aluminum mining Calculated by actual measurement method; total cyanide, total copper, total zinc, total lead, total mercury, total chromium, hexavalent chromium, total cadmium, total nickel, total silver are preferably measured Method accounting, followed by material balance algorithm accounting. When using the actual measurement method to calculate the source strength, the self-monitoring technical guide for the electroplating industry the enterprise's sewage permit requires the use of automatically monitored pollution factors, which can only be validated by effective automatic monitoring data;

The self-monitoring technical guide and enterprise sewage permit do not require the use of automatic monitoring of pollution factors, and the use of automatic monitoring data is preferred.

Second, manual monitoring of data is used.

For total corporate wastewater discharge, total copper, total zinc, total iron, total aluminum, suspended solids, chemical oxygen demand, ammonia nitrogen, total nitrogen, total phosphorus, stone Oil, fluoride and total cyanide are calculated by actual measurement.

For the wastewater discharge port of the workshop or production facility, total chromium, hexavalent chromium, total nickel, total cadmium, total silver, total lead and total mercury are calculated by the actual measurement method.

4.4.3 Noise

4.4.3.1 New (reconstruction, expansion) construction project pollution source

The source of pollution is strongly calculated using the analogy method.

4.4.3.2 Existing engineering pollution sources

The source of pollution is prioritized by the actual measurement method, followed by the analogy method.

4.4.4 Solid waste

4.4.4.1 New (reconstruction, expansion) construction project pollution source

The pollution source is prioritized by the analogy method, and the material balance algorithm is used for accounting.

4.4.4.2 Existing engineering pollution sources

The source of pollution is prioritized by the actual measurement method, followed by the material balance algorithm.

4.5 Summary of accounting results

See Appendix A for the format of the strong source accounting results.

5.1 Analogy

The emission of exhaust pollutants can be accounted for in comparison with the valid measured data of existing engineering waste pollutants that meet the requirements. Meet the following If the five principles apply, the analogy method may apply.

a) the same type of raw materials and the same ingredients related to pollutant discharge;

b) the same plating process;

c) the same type of plating;

d) pollution control measures are similar, and the efficiency of pollutant design removal is not lower than the efficiency of analog object removal;

e) The production lines are similar in scale (the difference in scale is not more than 20%), and the surface area of the workpiece in the plating tank is close.

5.2 Pollution coefficient method

5.2.1 Exhaust pollutant production

The method for estimating the amount of pollutants generated according to the pollution coefficient of the pollutant discharge law of the same kind of pollution source survey can be calculated according to the formula.

(1) Calculation.

610-= × × ×SD GA t (1) where. the amount of pollutants generated during the D-accounting period, t;

Gs-unit plating tank liquid surface area per unit time exhaust gas pollutant production, g/(m2 · h);

A-plating tank liquid level, m2;

The time during which the contaminant is produced during the t-accounting period, h.

The amount of chromic acid mist generated without adding a chromium mist inhibitor is calculated according to the formula (2).

910-chromic acid mist = × × × ×AD GJS t (2) where. D chromic acid mist - the amount of pollutants generated during the accounting period, t;

GA-hexavalent chromium chrome-plated ampere-hour chromic acid mist production, mg/(A · h);

J-cathode current density, A/dm2;

Total plating area in the S-accounting period, dm2;

T-plating time, h.

See Appendix B for the fouling coefficient of the main exhaust gas pollutants.

See Appendix C for the calculation method of the plated workpiece area.

5.2.2 Exhaust pollutant emissions

Exhaust pollutant emissions during the accounting period are calculated using equation (3).

= ×d D (3)

Where. the discharge amount of certain pollutants in the exhaust gas during the d-accounting period, t;

The amount of certain pollutants in the exhaust gas during the D-accounting period, t;

The efficiency of removal of certain pollutants by the exhaust gas treatment facility during the eta-accounting period, %.

Refer to Appendix F for the removal efficiency of typical exhaust gas treatment technologies.

5.3 Measurement method

5.3.1 The actual measurement method is to calculate the pollutant discharge amount through the actual exhaust gas emission and the corresponding pollutant discharge concentration, which is suitable for effective measurement.

Existing engineering sources of data for manual monitoring of data.

5.3.2 Using manual monitoring data accounting

When using manual monitoring data such as law enforcement monitoring and self-monitoring by pollutant discharge units for accounting of pollutant emissions, the accounting period should be used.

There are effective manual monitoring data for calculations. The frequency of self-monitoring by the pollutant discharge unit, the production conditions during the monitoring period, the validity of the data, etc.

GB 21900, GB/T 16157, HJ/T 373, HJ/T 397, HJ 630, HJ 819, self-monitoring technical guide for electroplating industrial sewage units and the discharge permit of the sewage unit. Except for law enforcement monitoring, the production load of all other manual monitoring periods should be no less than this monitoring and the average production load during the last monitoring period and gives a comparison of production load.

The source of exhaust gas pollutants is calculated according to formula (4).

Where. D - the amount of pollutants discharged during the accounting period, t;

Irho - the i-th monitoring measured hourly emission mass concentration in standard state, mg/m 3;

Iq - the i-th monitoring hour of exhaust emissions under standard conditions, m 3/h;

n - the amount of data that is effectively monitored during the accounting period, the quantity of dimension one;

h - the discharge time of pollutants during the accounting period, h.

6.1 Analogy

The discharge of wastewater pollutants can be compared with the valid measured data of existing engineering wastewater pollutants that meet the requirements. Electroplating industry analogy the applicable principles of the law are as follows. 5.1. The centralized sewage treatment plant that specializes in electroplating wastewater treats similar types of wastewater.

The plating process is similar, the plating area is similar (the scale difference principle is less than 30%), the pollution control measures are similar, and the pollutant design removal efficiency is similar.

Not less than the analog object removal efficiency.

6.2 Material Balance Algorithm

For metal ions (or CN-), the amount produced can be calculated according to equation (5).

610= -× × ×DSVC (5)

Where. the amount of pollutants generated during the D-accounting period, t;

Plating area in the S-accounting period, m2;

V-per square meter plating area volume (L/m2), the value can refer to Appendix D;

The concentration of metal (or total cyanide (in terms of CN-)) in the C-plate bath, g/L.

The concentration of metal ion (or CN-) pollutants in the outlet of the production unit can be calculated in combination with the amount of water used for cleaning the plated parts.

Can refer to the process design parameters to determine, if there is no process design parameters, please refer to Appendix E for the calculation of the amount of cleaning water.

For metal ions (or CN-), the emissions can be calculated according to equation (6).

= ×d D (6)

Where. the discharge amount of certain pollutants in the wastewater during the d-accounting period, t;

The amount of certain pollutants in the wastewater during the D-accounting period, t;

The pollutant removal efficiency of wastewater treatment technology during eta-accounting period, %.

6.3 Pollution coefficient method

Refers to the statistical average of the amount of pollutants produced in a unit of production, and the unit time according to the coefficient of production and the output of the product per unit time.

The amount of waste water pollutants generated, according to the amount of wastewater pollutants produced per unit time and the removal efficiency of pollution control measures, accounting for unit time and wastewater pollutants Emissions.

The discharge of a certain pollutant during the accounting period is calculated using equation (7).

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eta eta

beta= × × × ×iD M (7) where. D-unit time pollutant emissions, t;

M-unit time product output, m2;

Ii - the amount of production of a certain pollutant in a wastewater, g/m 2;

1eta - removal efficiency of a wastewater treatment facility for a wastewater treatment facility, %;

2eta - wastewater reuse rate, %.

The pollution yield coefficient of production wastewater is taken from the "Notice on the Release of the Pollution Discharge Coefficient of Pollutant Discharge and Material Accounting Method" the actual calculation of the actual emissions calculation method in the electroplating industry, Appendix A, after the national census of industrial pollution sources survey data, the latest version will prevail. Domestic sewage discharge can refer to the parameters in GB 50015. Total pollutant emissions equal to production wastewater and domestic sewage the sum of pollutants discharged.

Electroplating wastewat...