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Do you know Common Sewage Treatment Processes?

Jun. 09, 2020

As a Formaldehyde Production Plant, share with you.

01 Physical Law

1. Precipitation method: mainly remove inorganic particles and SS in waste water 2. Filtration method: mainly remove SS and oily substances in waste water 3. Oil separation: remove floatable oil and dispersed oil 4. Air floatation method: separation of oil and water, useful substances Recovery and suspended solids with a relative density close to 1 (the density of water is approximately 1) 5. Centrifugal separation: removal of tiny SS 6. Magnetic separation: removal of SS and colloids that are difficult to remove by precipitation

02 Chemical Law

1. Coagulation and precipitation method: remove colloid and fine SS2. Neutralization method: treatment of acid and alkali wastewater 3. Oxidation reduction method: removal of toxic and difficult biodegradable substances 4. Chemical precipitation method: heavy metal ions, sulfur ions, sulfuric acid Root ion, phosphate, ammonium, etc. removal

03 Physical Chemistry Method

1. Adsorption method: a small amount of heavy metal ions, hardly biodegradable organic matter, decolorization and deodorization, etc. 2. Ion exchange method: recovery of precious metals, radioactive waste water, organic waste water, etc. 3. Extraction method: hardly biodegradable organic matter, heavy metal ions, etc. 4. Stripping and stripping: removal of solubility and volatile substances.

04 Biological Law

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1. Activated sludge method:

A general term for various methods of micro-organism suspended in water in wastewater biological treatment.

(1) SBR method Sequencing Batch Reactor Activated Sludge Process (Sequencing Batch Reactor Activated Sludge Process) is an abbreviation of activated sludge sewage treatment technology that operates by intermittent aeration, also known as sequential batch activated sludge method . The core of SBR technology is the SBR reaction tank, which integrates the functions of homogenization, primary settling, biodegradation, secondary settling, etc. into one tank without a sludge return system. Advantages: 1) Simple process and cost saving 2) Ideal push flow process makes the biochemical reaction with high thrust and high efficiency 3) Flexible operation mode, good effect of nitrogen and phosphorus removal 4) The best process to prevent sludge expansion 5) Impact resistance Strong load and handling capacity

(2) CASS method The CASS method is an improved version of the SBR method, characterized by small footprint, low operating costs, mature technology, and stable process. The CASS method is to set a biological selection area in the front of the CASS reaction tank, and an automatic decanting device that can be raised and lowered in the rear. (3) AO method AO process method is also called anaerobic aerobic process method, A (Anacrobic) is an anaerobic section, used for nitrogen and phosphorus removal; O (Oxic) is an aerobic section, used to remove organic matter in water. Advantages: 1) The system is simple, the operating cost is low, and the floor space is small. 2) The carbon-containing organic matter and endogenous metabolites in the raw sewage are used as the carbon source, which saves the cost of adding an external carbon source. Organic matter can be further removed 4) The anoxic tank comes first, because denitrification consumes part of the carbon source organic matter, which can reduce the load of the aerobic tank 5) The alkalinity generated by denitrification can compensate for the alkalinity consumption of the nitrification process

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