There are two types of materials used in sewage treatment equipment: FRP and carbon steel. When purchasing the equipment, you need to ask the supplier about the materials used. When the process and other conditions are the same, the price will vary greatly.

As a matter of fact, no matter how the supplier describes the superior performance of the equipment, you should ask the supplier to provide running successful cases, and then send someone to inspect the on-site sewage treatment effect.

Many companies in the purchase did not indicate sewage treatment standards in the contract, so the buyer and seller in the later protection work will have disputes.

Before purchasing sewage treatment equipment, buyer should make a comparison, then sign a contract and indicate the payment process. Buyer shall select several suppliers for reference, and then make a comprehensive comparison on their adoption process, successful cases, price and other factors.

Sewage treatment equipment mainly removes suspended solid pollutants in sewage. Physical processing methods for the most part can only fulfill the requirements of primary processing. After the primary treatment of sewage, BOD can generally be removed about 30%, not up to the discharge standard. Primary treatment belongs to the pretreatment of secondary treatment. Further treatment of refractory organic matter, nitrogen and phosphorus and other soluble inorganic substances that can lead to eutrophication of water bodies will be carried out later.

The main methods include biological nitrogen and phosphorus removal, coagulation and precipitation, sand filtration, activated carbon adsorption, ion exchange and electrodialysis.