How To Deal With Electroplating Industry Wastewater?

Due to the different electroplating process, the wastewater produced is also different. Generally, the wastewater discharged by electroplating enterprises includes the treatment of wastewater such as acid and alkali, and the cyanide copper -plated cyanosal water, copper -containing wastewater, nickel -containing wastewater, chromium wastewater and other heavy metal wastewater. There are also various electroplating wastewater generation. How to deal with different industrial wastewater.

1. Chromium -containing industrial waste water.
The hexavalent chromium industrial wastewater is generally treated with chromium reduction method. The principle is to add sulfate, sodium sulfate, sodium sodium sulfate, sodium sulfate, sulfur dioxide, etc. under acidic conditions. Sodium hydroxide, calcium hydroxide, lime and other pH value are divided to generate three -valent chromium chromium hydroxide from the wastewater.
Conditional control of reaction: add sulfuric acid regulation pH value at 2.5 ~ 3, add a reducing agent for response, the final point of the reaction control controlled by ORP instrument is 300 ~ 330mv, the specific reaction time is determined by debugging, and the response time is about 15-20 minutes Essence You can use mechanical stirring, compressing air, or stirring with hydropower. PH value: 7 ~ 9, reaction time: 15 ~ 20 minutes, the condition of concrete reaction control.

2. Cyanis -containing wastewater.
At present, the process of treating cyanocytosis industry wastewater is relatively mature. It is treated with alkaline chloride. Pay attention to strict diversion of cyanide wastewater to avoid mixing nickel and iron and other metal ions, otherwise it will be difficult to deal with.
The principle of this method is that under alkaline conditions, wastewater is removed with chloride oxide and removed it. The treatment process is divided into two stages. The first stage is to oxidize cyanide to cyanate, which is not completely damaged. It is called an incomplete oxidation stage. The second stage is to further oxidize cyanate, which is called a complete oxidation stage.

3. Comprehensive treatment of heavy metal wastewater.
Heavy metal wastewater containing copper, nickel, zinc and other non -linked compounds, acidic and alkaline treatment of wastewater to form an industrial heavy metal comprehensive wastewater. The treatment of this type of wastewater is relatively simple. Generally, the precipitation process of generating hydroxide under alkaline conditions is generally used.
The processing process is as follows: Heavy metal comprehensive wastewater → adjustment pool → fast mixed pond → slow mixed pond → oblique tube sedimentation tank → filter → acid -base pool → emission reaction conditions are generally controlled at 9 ~ 10. Specifically, the best pH The conditions are determined by debugging. The response time of the fast mixing pool is 20 ~ 30 minutes, and the slow mixing pool is 10 ~ 20 minutes. The mechanical stirring method is the best, and it can also be stirred with air.

4. Comprehensive treatment of electroplating wastewater.
In a variety of electroplating wastewater such as cyanide wastewater, hexavalent chromium wastewater, cherries, pH, heavy metal copper, nickel, zinc, etc. Chromium wastewater, pH, heavy metal, nickel, zinc and other wastewater for diversion treatment. First, it contains cyanosal wastewater, chromium wastewater, hexavalent chromium wastewater, and then processed after the concrete process.

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