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title How to treat industrial electroplating wastewater

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Provider: GOP instruments (Shanghai) Co., Ltd Release time: July 29, 2020 reading times: 31 times >>Enter the company's stand
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How to treat industrial electroplating wastewater

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Electroplating technology is a very important modern surface processing technology, which is widely used in metal surface protection, decoration processing, electronic industry, communication, military industry, aerospace and other fields, and is an indispensable link in the manufacturing industry chain. As one of the three major pollution industries in the world, electroplating industry is the main output industry of heavy metal wastewater (including nickel, copper, chromium, zinc and other heavy metals). and The wastewater contains heavy metal ions, organic and inorganic mediators and other harmful substances. When these substances enter the environment, they will cause extensive and serious harm to the ecological environment and human beings. The treatment of electroplating wastewater is still a small problem that can be ignored.

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1. Main treatment methods of electroplating wastewater

There are many methods to treat electroplating wastewater, which can be divided into physical method, chemical method, physicochemical method and biological method.

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1.1 physical method

Physical method is to use physical action to separate the main suspended pollutants in wastewater, and the chemical properties of the substances will not be changed in the process of treatment, such as oil removal in electroplating wastewater, evaporation concentration and reuse water. As a common method, electrodialysis is only used in the treatment of wastewater.

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1.2 chemical method

To change the nature of a chemical substance from wastewater by chemical treatment. At present, the application of chemical method in electroplating wastewater treatment is Z = 0 Extensive. This method has the advantages of simple and reliable operation, less investment, able to bear large amount of water and high concentration load, stable effect and so on. It is suitable for various types of electroplating enterprises to treat wastewater. However, there is a secondary pollution problem of electroplating sludge, and enterprises generally entrust qualified units to dispose of it.

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1.3 physicochemical method

Physicochemical method refers to the comprehensive action of physics and chemistry to purify wastewater. The electrolysis method and ion exchange method are widely used, both of which can realize the recovery of heavy metals, and the effluent quality is better, but the equipment cost and operation cost are relatively high, so there are certain restrictions on the promotion, and they are usually combined with other processes.

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1.4 biological method

The biological treatment process of wastewater mainly uses the life activity process of microorganisms to transfer and transform the pollutants in the wastewater, so as to purify the wastewater. Biological treatment of electroplating wastewater is a promising technology. In terms of process flow and operation control, the factory is easy to accept. If biologists can further improve the functional bacteria, rapid reaction and efficient reproduction can be realized Reduce the cost used (e.g. equipment investment), This new technology can become a simple, reliable, economical and practical advanced technology for electroplating wastewater treatment.

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Problems and solutions in the process of electroplating wastewater treatment and reuse

At present, many electroplating enterprises, in the electroplating wastewater treatment and recovery, is usually the electroplating wastewater for conventional chemical treatment, after reaching the discharge standard, directly discharged, not recycled. Although heavy metal ions are almost completely removed, the proportion of non heavy metal ions, soluble salts and other impurities in the water is still very high. The conductivity of the water is about 0.15 ~ 0.25 s / m. The nature of this kind of water is similar to that of sea water. It can only be used for toilet flushing and limited water landscape in factories, and even can not be used for greening for a long time. Due to the more and more strict requirements for reclaimed water reuse in China, enterprises need to improve the wastewater treatment process and add advanced treatment devices to meet the reclaimed water reuse index. At present, the combined processes of reverse osmosis, ion exchange, nanofiltration and ultrafiltration are widely used, and the conductivity of treated water is reduced to 0.035-0.045 S / m, which can only be reused in part of the roughing process of pretreatment of electroplating production line, and the reuse rate of reclaimed water can reach about 50% - 60%. In the actual wastewater treatment and reuse process, there are still many problems, need to further improve the process, improve the level.

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three New development trend of electroplating wastewater treatment industry

Electroplating industry is related to the national economy and people's livelihood, but also high pollution, high water consumption industry. If the wastewater is discharged without treatment, it will cause great damage to the water body It is harmful to aquatic animals and plants, crops, animals and human beings. For electroplating wastewater, a variety of treatment methods should be combined and treated separately to achieve the best treatment effect. and On the basis of the traditional treatment methods, actively develop new methods to reduce the energy consumption and cost of treatment, improve the treatment effect, and meet the call of clean production, energy conservation and emission reduction

key word: On line water quality analyzer ??

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