Acid pickling phosphating is a common process in the electroplating industry, which involves removing oil--wash--acid pickling--wash--Phosphating--wash--bake--Spray painting is mainly aimed at improving the protective and decorative performance of metals. The generated sewage is due tophgreater than6-9Causing difficulty for microorganisms to survive, it is necessary to first mix this type of wastewaterPHGo to the appropriate range and then treat the sewage.

1、 The source of electroplating wastewater

Electroplating wastewater mainly comes from cleaning of plated parts, floor washing, hanging fixtures, and electrode plate washing, while electroplating waste liquid mainly comes from the replacement of waste tank solution. Plating cleaning wastewater is one of the main sources of electroplating wastewater, accounting for the total discharge of production wastewater80%Above, various pollutants are carried into the plating cleaning wastewater by the bath solution attached to the surface of the plated parts. A small amount of wastewater is generated during the processes of floor washing, hanging tool washing, and laboratory analysis in the workshop. All of it should be collected and discharged into the wastewater treatment station.

2、 The water quality of electroplating wastewater

There are various types and complex electroplating processes, and the water quality of electroplating wastewater from different enterprises varies greatly. However, the common feature is that they all contain pollutants such as heavy metal ions, acids, and alkalis. Common heavy metal ion pollutants include chromium, copper, nickel, zinc, gold, silver, and lead. Common acid and alkali pollutants include sulfuric acid, hydrochloric acid, nitric acid, phosphoric acid, sodium hydroxide, sodium carbonate, etc. In addition, wastewater also contains a certain amount of organic matter, ammonia nitrogen, etc

3、 Equipment advantages

Simple structure, capable of automatic control;

Low frequency and time period of backwashing;

High filtration efficiency;

The filling material is used for a long time and does not need to be replaced frequently;

The price of fillers is cheap