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my country's industrial production consumes more and more chemicals, and the extensive use of phosphorus-containing degreasing agents and phosphating solutions has caused phosphorus pollution.

Traditional phosphate wastewater treatment

The main pollution factors of traditional phosphating process are:

, Mn, Ni, etc.

For coating wastewater, PH=9, heavy metal ions (such as Zn2+, Fe2+, Mn 2+, Ni 2+, etc.

A three-tank treatment method can be used: the first tank is homogenized with lime water and demulsifier to neutralize the sedimentation, the second tank is added with polymer flocculants and other flocculation sedimentation; after clarification, enter the third tank to adjust the pH value and discharge.

Silane process wastewater treatment

The main pollution factors of the silane process are: surfactants, corrosion inhibitors, inorganic salts, a small amount of fluoride ions, COD, a small amount of silicon and zirconium ions, etc.

For coating wastewater, PH=9, heavy metal ions (such as zirconium ion) almost completely precipitate; pH value is maintained at about 8.

A three-tank treatment method can be used: the first tank is homogenized with lime water and demulsifier to neutralize the sedimentation, the second tank is added with polymer flocculants and other flocculation sedimentation; after clarification, enter the third tank to adjust the pH value and discharge.

Wastewater treatment cost comparison

 Phosphate in phosphating is about 15000PPM, the total of zinc, nickel, and manganese is about 3000PPM, and the washing factor is calculated as 100.

 Silane technology does not contain phosphorus.

 Based on the average monthly treatment of 1,000,000 square meters and the production of about 15L of wastewater per square meter, the monthly processing of 15,000 tons of wastewater will increase the cost of phosphating by 25,500 yuan.