Underground secondary biochemical domestic sewage treatment equipment

Underground secondary biochemical domestic sewage treatment equipment

Underground secondary biochemical domestic sewage treatment equipmentIt is an integrated treatment system that adopts biological contact oxidation method and push flow process, with the characteristics of high efficiency, stability, and high degree of automation, suitable for treating domestic sewage and similar organic wastewater.

The device works in synergy through modules such as anaerobic biofilter, contact oxidation tank, and secondary sedimentation tank

Filtration and hydrolysis: Anaerobic filters intercept suspended solids through fillers and convert large organic molecules into small molecular substances. ‌

Biodegradation: In the contact oxidation tank, aerobic microorganisms adsorb and decompose organic pollutants, with COD and BOD removal rates of over 80%. ‌

Sedimentation and disinfection: The secondary sedimentation tank separates suspended sludge by gravity to ensure the quality of the effluent water; The disinfection pool adopts solid chlorine sterilization to meet the emission standards. ‌

Process principle of buried secondary biochemical domestic sewage treatment device:

Activated sludge process

Through the metabolic process of aerobic microbial communities, organic matter is degraded to form biological flocs that adsorb pollutants, significantly reducing BOD and COD indicators

Key links: maintenance of dissolved oxygen in the aeration zone, regulation of microbial food chain (bacteria → protozoa → protozoa)

Advantages: Adapt to water quality fluctuations and withstand impact loads

Biological contact oxidation method

Adopting a push flow design and equipped with elastic three-dimensional packing, the specific surface area is large, and microorganisms are prone to biofilm formation and detachment

Parameters: Gas water ratio of 12:1, residence time ≥ 6 hours Point: Fixed live cell process combined with external aeration system

Structural design of buried secondary biochemical domestic sewage treatment device:

Integrated steel structure: adopting fully buried design, saving surface space, suitable for scenarios such as hospitals and residential areas

Core Unit:

Hypoxia pool: equipped with elastic packing to promote microbial biofilm formation and enhance the ability to decompose organic matter

Aerobic tank: using a composite aeration method combined with three-dimensional packing to improve oxygen utilization efficiency and biofilm activity

Membrane separation unit: ultrafiltration membrane components intercept suspended solids and microorganisms, and the effluent can reach Class A standard

Auxiliary systems: PLC automatic control, chemical film cleaning device, and soil deodorization facilities

Process principle of buried secondary biochemical domestic sewage treatment device:

Anaerobic stage: Sewage enters the anaerobic tank, where anaerobic microorganisms decompose large molecular organic matter into small molecular organic matter (such as volatile fatty acids), while producing methane and carbon dioxide, reducing chemical oxygen demand (COD) and biochemical oxygen demand (BOD).

Aerobic stage: Sewage enters the aerobic tank and is provided with oxygen through aeration. Aerobic microorganisms further oxidize residual organic matter and use nitrification to remove ammonia nitrogen and denitrification to remove nitrate, ultimately achieving denitrification. ‌

The main application areas of the buried secondary biochemical domestic sewage treatment device are:

Domestic sewage treatment

Used for daily sewage treatment in urban, rural and other living areas, including toilet manure, laundry and bath water, kitchen drainage, etc. ‌

Industrial wastewater treatment

It can treat industrial wastewater from papermaking, pharmaceuticals, printing and dyeing, chemical fibers, leather making, food and beverage, traditional Chinese medicine extraction, circuit boards, smelting, electroplating, petrochemicals, and other industries. ‌

Special venue handling

Suitable for sewage treatment in ecologically fragile places without sewage pipe network systems (such as highway rest stations, scenic areas), as well as areas that require sewage reuse (such as boiler water, car washing industry). ‌

Livestock and medical wastewater

Used for the treatment of aquaculture wastewater and infectious disease hospital wastewater, medical wastewater needs to be treated through the process of "regulating tank → biological oxidation → contact disinfection"