A new process: be a brilliant man of wide learning closed centralized treatment of electroplating wastewater

2015-10-07 21:30:38

Electroplating is one of the basic technology in machine manufacturing. It is an essential processing technology in modern economy. It plays a very important role in industrial production. But in the promotion of economic development at the same time, China's electroplating production pollution is worrying, according to incomplete statistics, in 1999 the national industrial and urban sewage discharge total 40100000000 m3, electroplating factory emissions of waste water reached 4000000000 m3, this shows that the discharge of electroplating wastewater is about 10% of the total industrial wastewater. In the electroplating factory Zhou x, river pollution is serious, the death of fish. More seriously, some heavy metals. Such as lead, chromium into the crops through the absorption of the soil, after people eat in the body caused by accumulation of toxic or carcinogenic.

At present, the majority of electroplating enterprises through the end of treatment can achieve more effective treatment of pollution, but this is the first pollution control method, there are many problems and defects. In particular, there are economic benefits. Control investment and operating costs are higher, the pollution control of the economy to the enterprise to bring a heavy burden, seriously affect the enthusiasm of employees. Moreover, most of the factory's processing facilities are not up to standard, from the economic and environmental point of view, can be considered a city or a region to focus on recycling, the establishment of regional electroplating wastewater treatment center, the use of decentralized pretreatment, collection and centralized processing and management methods, combined with mobile processing units and processing technology to achieve a certain economic benefits. The following introduction of the process.

Electroplating wastewater produced by electroplating process of plating pieces in addition to oil, rust and other wastewater pretreatment, plating parts rinsing wastewater and electroplating, passivation, stripping and so on process of waste stillage. In the past, the electroplating industry is usually treated by a separate treatment of the sewage, the processing scale is very small, the construction of investment and high cost, there is the scale effect, resulting in the waste of social capital. In addition, the disposal of the sludge can not be properly disposed of, very easy to produce two pollution. And the socialization of electroplating wastewater centralized treatment overcomes the shortcomings mentioned above, in this regard, no Er region of Germany and Japan Tokyo waste society of centralized treatment are quite successful example. China has also proposed the establishment of regional electroplating wastewater and sludge treatment center, professional factory or Service Corporation in 1979, and gradually do waste treatment industrialization and social group's proposal". According to "the people's Republic of China Environmental Protection Law" and the eight environmental management system "regional pollutant concentration control system requirements, Tianjin Development Zone of electroplating wastewater treatment using pre dispersed processing, collection and centralized processing and management of a combination of measures: containing low concentration of Sn, Pb, Cr, Cu and heavy metal ions and a small amount of organic matter coating multistage countercurrent rinsing waste water within the various electroplating enterprises in situ necessary pre processing (cyanide breaking, adjusted to pH). Then fluid conveying to the factory storage regulation pool waiting for centralized treatment.

In view of the development zone pollution sources and wide, wastewater transport pipeline corrosion requirements, engineering cost and the water recycling pipe network investment huge, etc., the Development Zone electroplating wastewater treatment is not used usually pipeline centralized wastewater treatment, but the use of the mobile treatment vehicle loaded ion exchange column for the treatment of the electroplating factory points. After the ion exchange resin is exchanged, the mobile treatment vehicle returns to the wastewater treatment center to receive the regeneration.

Use 10 sets of movable treatment trolley, including Sn / Pb movable treatment trolley 6 sets, mobile Cu processing vehicle 2 sets, mobile / Cr treatment 2 sets were treated mixed wastewater of tin and lead, cyanide copper plating wastewater with chromium plating wastewater containing. The effluent can be directly back to the electroplating factories and collection equipment, for electroplating rinsing process. Mobile car ion exchange using Shuangyang double anion series process, if negative column effluent cannot meet can also be taken into account in the anion exchange column connected in series of the mixed bed. Ion exchange resins were selected with the purpose of high efficiency, easy regeneration, good stability of the principle, the column cation resin selected sp112, anion exchange column ion exchange resin used MP64 and mixed bed cation resin and anion resin respectively for sp112 and mp500, above three kinds of resin were for the German Bayer production.

The treatment center consists of a wastewater treatment unit, a regeneration unit, an electrolytic cell, and a water unit. The brief functional description of each unit is as follows:

(1) regeneration unit. After the ion exchange resin is saturated, the processing center of the vehicle returns to the processing center. In the regeneration unit, the ion exchange resin can be regenerated so that it can be renewed. The regeneration of the cation exchange column in Sn/Pb and Cu mobile treatment vehicle needs to enter the electrolytic cell, recycling metal resources and regeneration agent. In order to improve the electrolysis efficiency and the concentration of the regeneration agent, the first discharge of the concentrated regeneration liquid and the back of the dilute regeneration liquid separate collection, the former direct electrolysis, the latter by the choice of ion exchange column metal ion concentration, the saturation of the elution solution and electrolysis.

(2) electrolytic cell. The electrolysis unit mainly recovered the acid and metal in the regeneration liquid of the positive column of the Sn/Pb mobile unit and the Cu mobile unit, and the acid back was used for the regeneration of the ion exchange column. Using Sn / Pb mobile unit of the positive column regeneration liquid diaphragm electrolysis, 8 units, every day can be recycled metal 90kg, Cu mobile unit of the positive column regeneration liquid using plate type electrolysis, 2 units, every day can be recycled metal 12kg.

(3) pure water unit. Electroplating wastewater treatment center of pure water unit of construction is to provide required for regeneration of backwash water, water leaching and preparation of regeneration agent, agent, such as water, to avoid the purchase additional water to increase the processing cost.

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