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Waster Water Treatment Method Do You Know?

Waster Water Treatment method you know?

The purpose of Waster Water Treatment is to separate the contaminants in the waste water in a way, or to convert it into harmless substances, so that the sewage is purified. Generally to prevent the prevention of poison and pathogens of infection; to avoid the smell of smell and hate visible objects to meet the requirements of different purposes.

The basic method of waste treatment is to use physical, chemical or biological methods, or several methods to use to remove harmful substances in the wastewater, according to the water quality and treatment of the fate of the water to determine its treatment, Waster Water Treatment can be divided into a general, Secondary and tertiary processing.

Waster Water Treatment Basic methods: (1) primary treatment using physical treatment methods, that is, with grille, sieve, sediment pool, sedimentation tank, grease trap and other structures, remove the waste water in the suspended solids, oil slick, the initial adjustment PH, reduce the degree of corruption of the wastewater. Wastewater after a level of treatment, generally not meet the emission standards (BOD removal rate of only 25-40%). It is usually a pretreatment stage, in order to reduce the follow-up process load and improve the processing effect.

Basic methods of Waster Water Treatment: (2) secondary treatment is the use of biological treatment methods and some chemical methods to remove the waste water in the degradation of organic matter and part of the colloidal pollutants. After secondary treatment, the removal rate of BOD in wastewater can reach 80-90%, that is, the amount of BOD can be less than 30mg / L. After secondary treatment of water, generally can meet the agricultural irrigation standards and wastewater discharge standards, so the secondary treatment is the main body of Waster Water Treatment. But after the secondary treatment of water also retains a certain amount of suspended solids, biological decomposition of dissolved organic matter, dissolved inorganic and nitrogen and other algae value-added nutrients, and contains viruses and bacteria. And thus can not meet the requirements of higher emission standards, such as processing into the flow of smaller, poor dilution of the river may cause pollution, can not be directly used as tap water, industrial water and groundwater recharge water.

Waster Water Treatment basic methods: (3) tertiary treatment is to further remove the secondary treatment failed to remove the pollutants, such as phosphorus, nitrogen and biological difficult to degrade organic pollutants, inorganic pollutants, pathogens and so on. The tertiary treatment of wastewater is based on the secondary treatment, further using chemical methods (chemical oxidation, chemical precipitation, etc.), physical and chemical methods (adsorption, ion exchange, membrane separation technology, etc.) to remove some of the specific pollutants Kind of "deep processing" method. Obviously, the tertiary treatment of waste water is costly, but can make full use of water resources. The following are the same as the "

Waster Water Treatment is quite complex and the choice of treatment method must be based on the water quality and quantity of the wastewater, the use of water or water to be taken into consideration. But also to consider the waste water treatment process of sludge, the use of residue and the possible secondary pollution problems, as well as the recovery of flocculants.

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