I. Product Features
  1、The entire set of equipment can be buried below the frost layer or placed above ground. The surface above the equipment can be used for greening or other purposes, eliminating the need for building construction, heating, or insulation.
  2、The secondary biological contact oxidation treatment process adopts a plug-flow biological contact oxidation method, which offers better treatment efficiency than completely mixed or two-stage series completely mixed biological contact oxidation tanks. It also has a smaller volume than activated sludge tanks, strong adaptability to water quality, and excellent impact load resistance.

, ensuring stable effluent quality without sludge bulking. The tank utilizes a new type of elastic three-dimensional filler with a large specific surface area, facilitating microbial biofilm attachment and detachment. Under the same organic load conditions, it achieves a high removal rate of organic matter and enhances the solubility of oxygen in water.

. 
  3、The biochemical tank uses the biological contact oxidation method, with a relatively low volumetric load of the filler. Microorganisms are in the endogenous respiration phase, resulting in minimal sludge production. Sludge removal is only required once every three months (90 days) or longer (extracted by suction truck or dewatered into sludge cakes for transport).
  4、In addition to conventional high-altitude exhaust for deodorization, this underground domestic sewage treatment equipment is equipped with soil deodorization measures.
  5、The entire equipment treatment system is equipped with a fully automatic electrical control system, ensuring safe and reliable operation. It generally does not require dedicated management on a daily basis, only periodic maintenance and upkeep. III. Several Usage Methods of Underground Domestic Sewage Treatment Devices
II. Usage Methods
    Capable of treating comprehensive domestic wastewater and similar organic sewage;
    Constructed with fiberglass reinforced plastic (FRP) or stainless steel, offering excellent corrosion resistance and anti-aging properties, with a service life of over 50 years;
    The entire system is simple to install and easy to operate, with all mechanical equipment automated. The entire setup can be installed below ground level; IV. Application Scope of Underground Domestic Sewage Treatment Devices 
III. Application Scope
  1、Hotels, restaurants, sanatoriums, hospitals; 
  2、Residential communities, villages, towns; 
  3、Stations, airports, seaports, ships; 
  4、Factories, mines, military units, tourist spots, scenic areas; 
  5、Various industrial organic wastewater similar to domestic sewage.