Water treatment includes: sewage treatment and drinking water treatment two kinds, some places also divide sewage treatment into two kinds, namely sewage treatment and medium water return to use two kinds.
The commonly used water treatment agents are: polymerized aluminum chloride, polymeric aluminum chloride, basic aluminum chloride, polyacrylamide, activated carbon and various filter materials.
Water treatment effects can be measured by water quality standards.
The processing of raw water (raw water) in order to meet the water quality requirements of finished water (domestic water, production water or effluent).
When raw water is used as water for life or industry, it is called water treatment;
When processing waste water, it is called waste water treatment.
The purpose of wastewater treatment is to discharge waste water (into water or land) or reuse it (see waste water disposal, waste water reuse).
In the recycling water system and the regeneration treatment of water, the raw water is the waste water, the finished water is the water, the processing process has the nature of water treatment and wastewater treatment.
Water treatment also includes treatment and final disposal of waste water and sludge produced during treatment (see sludge treatment and disposal), and sometimes waste gas treatment and discharge.
Water treatment can be summarized in three ways: the most commonly used is to obtain the required water quality by removing some or all impurities in the original water;
To obtain the desired water quality by adding new components in the original water and by physical or chemical reaction;
The processing of raw water does not involve removing impurities or adding new components.