Underground sewage treatment equipment is a modular and efficient sewage biological treatment device, which is a sewage biological treatment system with biofilm as the purification main body. It fully utilizes the characteristics of biofilm reactors such as anaerobic biofilters and contact oxidation beds, such as high biological density, strong pollution resistance, low power consumption, stable operation, and easy maintenance.

The working principle of buried domestic sewage treatment and anaerobic biological filter:

1. Filtration function: The packing material intercepts and filters large particles and suspended solids in the incoming water

2. Hydrolysis: Anaerobic microorganisms can hydrolyze insoluble substances of large molecules into soluble substances of small molecules

3. Absorption function: Anaerobic microorganisms adsorb and absorb organic pollutants in water, partially for their own growth and reproduction, and partially in the form of biogas sealed by U-shaped water

4. Denitrification: Denitrifying bacteria that reflux the effluent from the contact oxidation bed to the anaerobic microorganisms in the anaerobic filter can utilize the nitrate nitrogen in the reflux water and convert it into nitrogen to remove nitrogen substances from the wastewater. The treatment of rural sewage by anaerobic filters reduces the concentration of suspended solids, organic pollutants, and nitrogen, as well as the subsequent load on the contact oxidation bed.

Characteristics of Underground Sewage Treatment“

1. Buried below the ground surface, the surface above the equipment can be used for greening or other purposes, without the need for building houses, heating, or insulation.

2. The secondary biological contact oxidation treatment process adopts push flow biological contact oxidation, which has a better treatment effect than fully mixed or two-stage series fully mixed biological contact oxidation tanks. And it has a smaller volume than activated sludge tanks, strong adaptability to water quality, good shock load resistance, stable effluent quality, and will not cause sludge expansion. A new type of elastic three-dimensional packing material is used in the pool, with a large specific surface area and easy biofilm formation and detachment by microorganisms. Under the same organic load conditions, it has a high removal rate of organic matter and can improve the solubility of oxygen in the air in water.

3. The biochemical tank adopts the biological contact oxidation method, which has a relatively low volume load of the filling material, and the microorganisms are in their own oxidation stage, resulting in low sludge production. It only takes more than three months (90 days) to discharge the sludge (using fecal trucks to suction or dehydrate into sludge cakes for external transportation).

4. In addition to conventional high-altitude exhaust, the deodorization method of the buried domestic sewage treatment equipment is also equipped with soil deodorization measures.

5. The entire equipment processing system is equipped with a fully automatic electrical control system and equipment fault alarm system, which operates safely and reliably. Generally, there is no need for dedicated personnel to manage it, and only timely maintenance and upkeep of the equipment is required.

Application scope of buried sewage treatment:

1. Hotels, restaurants, sanatoriums, and hospitals;

2. Residential communities, villages, and towns;

3. Stations, airports, seaports, and ships;

4. Factories, mines, troops, tourist attractions, and scenic spots;

5. Various industrial organic wastewater similar to domestic sewage.