2. For example, sedimentation (gravity separation method) to remove suspended matter in water with a relative density greater than 1.
3. Filtration (filter sand layer of activated carbon) can remove suspended solids in the water.
4. Evaporation is used to concentrate non-volatile and soluble substances in wastewater.
5. Chemical method: the use of chemical reactions or physicochemical treatment to recover soluble waste or colloidal substances.
6. For example, the neutralization method is used to neutralize acidic or alkaline wastewater.
7. Extraction method using soluble waste in the two-phase action of different solubility "distribution", recovery of phenols and heavy metals, etc..
8. Redox method is used to remove the reducing or oxidizing pollutants in the wastewater, kill pathogenic bacteria in natural waters.
9. Biological method: the use of microorganisms in the biochemical treatment of organic pollutants in wastewater.
10. For example, biological filtration and activated sludge method of treatment of domestic sewage or organic production of wastewater, so that the organic matter is converted and degraded into inorganic salts and purified.
11. Sludge land treatment method: for organic matter treatment.
12. Sewage irrigation, slow infiltration, fast infiltration.