Alkali aluminum chloride used to deal with pickling industrial wastewater process steps Process using basic aluminum chloride pickling industrial wastewater process steps Process Acid pickling Phosphating sewage has a higher concentration of zinc and iron , Phosphorus material, COD mass concentration between 300 ~ 400mg / L. The wastewater involved in the production process includes the cleaning wastewater produced during the processes of degreasing, pickling, surface conditioning and phosphating of metal parts, and the pickling and phosphating mother liquor. If the sewage is discharged directly without being treated, it will cause serious pollution to the environment. I plant for cleaning the characteristics of sewage water quality and long-term experience in sewage treatment. It is recommended to use chemical precipitation + coagulation float + activated carbon adsorption process pickling phosphate wastewater. The results of engineering operation show that the treatment effect is good, the treated effluent reaches the first grade in Integrated Wastewater Discharge Standard (GB8978-1996), and the effluent reuse rate reaches 80%, among which, COD, phosphate (calculated as P) , The average removal rates of petroleum and Zn2 + were 81.5%, 99.9%, 98.8% and 97.9% respectively. Pickling phosphating wastewater treatment with basic aluminum chloride to deal with, you can get a higher environmental and economic benefits. Pickling phosphating wastewater BOD main grease organic matter, and pickling wastewater contains a lot of acid, the use of basic aluminum chloride, the wastewater can be adjusted from acidic to neutral, and then flocculation and sedimentation. Pickling phosphating wastewater treatment often used in the treatment: pickling industrial wastewater mainly in the pickling and rust removal process of steel parts generated, the pH of the wastewater is generally 2-3, there is a high concentration of Fe2 +, SS concentration is also high . Can refer to the following industrial wastewater treatment process for treatment: wastewater → conditioning pool and the pool → aeration tank → coagulation reaction tank → sedimentation tank → filter tank → pH callback pond → discharge Phosphatizing wastewater, also known as membrane wastewater, refers to the iron Pieces containing manganese, iron, zinc and other phosphate solution after chemical treatment, the surface layer of phosphate-insoluble protective film formed in water, as the spray primer to prevent iron rust. The main pollutants in this type of industrial wastewater are: pH, SS, PO43-, COD, Zn2 + and so on. Can refer to the following industrial wastewater treatment process for treatment: wastewater → regulation pool → a coagulation reaction tank → settling tank → secondary coagulation reaction tank → secondary settling tank → filter tank → discharge of aluminum anodized industrial wastewater pollutants Mainly pH, COD, PO43-, SS, etc., so the phosphating industrial wastewater treatment process for anodizing wastewater treatment. Acid phosphating waste water treatment to take other methods such as: 1. Acid recovery of waste water; (if direct neutralization pickling waste water about 150 yuan / ton, add sodium hydroxide, and add lime is not realistic, because After adding lime, the entire waste water has become a sludge) 2. Precipitation and treatment of heavy metals, sludge, safe and reasonable treatment. (The pickling wastewater contains a large amount of heavy metals, which are hazardous wastes. Therefore, they must be strictly controlled, and their pH must be strictly controlled depending on the pH conditions under which they are precipitated.