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Sewage treatment with what chemicals?

Release time: 2024-09-21

The suspended solids in the water are condensed into larger particles, which is convenient for subsequent precipitation or filtration.

There are many kinds of chemicals used in the sewage treatment process, and the selection and application of these chemicals often depend on the specific process and discharge standards. The following is an overview of common chemicals used in sewage treatment according to different technological processes and discharge standards:

1. common sewage treatment chemicals

flocculant

Function: The suspended solids in the water are condensed into larger particles, which is convenient for subsequent precipitation or filtration.

Common types: polyacrylamide (PAM), polyaluminium chloride (PAC), polyferric sulfate (PFS), etc.

Application: widely used in primary sedimentation tank, secondary sedimentation tank, depth treatment and other links.

Coagulant aid

Function: The auxiliary flocculant plays a role to improve the coagulation effect.

Commonly used types: according to the specific water quality and flocculant type selection.

conditioner

Function: conditioning the residual sludge before dewatering to improve its dewatering performance.

Common types: including organic and inorganic conditioners, the specific choice should be determined according to the nature of the sludge.

Demulsifier

Function: It is mainly used for the pretreatment of oily wastewater, destroying the emulsified state of oil and water, and making the oil droplets gather and float.

Commonly used types: such as polyether, phenolic resin, etc.

Defoamer

Function: Eliminate a large number of bubbles generated during aeration or stirring, and prevent foam overflow from affecting the treatment effect.

Commonly used types: silicone, polyether, etc.

pH Adjuster

Function: Adjust the acidity and alkalinity of the sewage to meet the requirements of the subsequent treatment process.

Common types: hydrochloric acid, sulfuric acid, sodium hydroxide, liquid alkali, etc.

oxidation reducing agent

Function: Treatment of wastewater containing oxidizing substances or reducing substances, and removal of pollutants through oxidation-reduction reactions.

Common types: sodium hypochlorite, potassium permanganate, ferrous sulfate, etc.

Disinfectant

Function: Disinfection treatment before wastewater discharge or reuse to kill pathogens.

Commonly used types: chlorine-containing disinfectants (such as sodium hypochlorite), ozone, etc.

2024-05-16 00:00