Underground integrated sewage treatment equipment

Usage Introduction

With the growth of the economy and population, the pollution of nature is receiving increasing attention from humans. On the basis of summarizing the introduction of foreign domestic sewage treatment equipment, combined with our own scientific research achievements and engineering practice, we have designed a complete set of organic sewage treatment equipment that can be buried underground. The equipment adopts imported foreign processes and manufacturing technologies, and produces WSZ-F buried sewage treatment equipment mainly made of fiberglass and WSZ-A series buried integrated sewage treatment equipment mainly made of carbon steel. Its main purpose is to meet the discharge standards required by users after treating domestic sewage and similar industrial organic wastewater with this equipment.

Application scenarios

1. Factory domestic sewage treatment, mine domestic sewage treatment, school canteen sewage treatment, tourist destination sewage treatment, highway service area toll station sewage treatment, scenic area sewage treatment.

2. Hotel wastewater treatment, restaurant wastewater treatment, sanatorium wastewater treatment, hospital wastewater treatment.

3. Residential area sewage treatment, villa area sewage treatment, commercial building sewage treatment, new rural sewage treatment, and town domestic sewage treatment.

4. Station sewage treatment, airport sewage treatment, harbor terminal sewage treatment, ship factory sewage treatment

5. Wastewater treatment in aquatic processing plants, livestock processing plants, fresh milk processing plants, as well as production and domestic wastewater treatment in various factories.

6. Various industrial wastewater treatments similar to domestic sewage.

Working principle

The removal of organic pollutants and ammonia nitrogen by underground integrated sewage treatment equipment mainly relies on the AO biological treatment process in the equipment. Its working principle is at level A. Due to the high concentration of organic matter in sewage, microorganisms are in a state of hypoxia. At this time, microorganisms are facultative microorganisms, which convert and decompose organic nitrogen in sewage into NH3-N. At the same time, they use organic carbon sources as electron donors to convert NO2-N and NO3-N into N2, and also use some organic carbon sources and NH3-N to synthesize new cellular substances. So A-level tanks not only have a certain organic matter removal function, but also reduce the organic load of subsequent aerobic tanks. Beneficial for nitrification and relying on the high concentration of organic matter present in the raw water to complete denitrification and eliminate nitrogen eutrophication pollution. At level O, although the concentration of organic matter has significantly decreased, there is still a certain amount of organic matter and high NH3-N present in the sewage treatment equipment. In order to further oxidize and decompose organic matter, and to ensure the smooth progress of nitrification after carbonization is completed. Set up aerobic biological contact oxidation tanks with low organic load at level O. There are mainly aerobic microorganisms and self oxidizing bacteria in the O-level pool. Aerobic microorganisms decompose organic matter into CO2 and H2O; Self oxidizing bacteria use inorganic carbon produced by the decomposition of organic matter or CO2 in the air as a nutrient source to reflux NO2-N and NO3-N from O-grade wastewater to A-level tanks. Provide electron acceptors for A-level pools to eliminate nitrogen pollution through denitrification.

Product Features

1. The buried integrated sewage treatment equipment is capable of treating comprehensive wastewater from domestic systems and similar organic wastewater.

2. The secondary biological contact oxidation treatment process of the buried integrated sewage treatment equipment adopts the contact oxidation process, which has a smaller volume than activated sludge and better adaptability to water quality. The effluent water quality is stable and does not produce sludge swelling.

3. The buried integrated sewage treatment equipment can be buried below the ground surface, which can be used as green or square land. Therefore, the equipment does not occupy the surface area, does not require building, and does not require heating and insulation.

4. The underground integrated underground sewage treatment equipment is easy to construct and operate, with all mechanical equipment controlled by automation. All equipment is located below the surface.

5. The entire buried sewage treatment equipment generally does not require dedicated management, only timely maintenance and upkeep of the equipment.

6. No need to compress the container. Equipment such as air compressors and circulation pumps greatly reduce investment costs.

7. Low required power, minimal maintenance and manual operation.

8. If an underground sewage treatment equipment is used in cold areas, the inspection hole can be raised to bury the equipment below the frozen soil.

9. The buried sewage treatment equipment consists of two levels of tanks. The first level is a reinforced concrete structure with a larger burial depth, while the other group is a steel structure with a shallower burial depth. The steel structure pool adopts interpenetrating network anti-corrosion coating for corrosion prevention. It is an interpenetrating polymer formed by the interpenetrating of a rubber network and a plastic network. It is resistant to acid, alkali, salt, gasoline, kerosene, aging, abrasion, and rust. After applying the coating, the anti-corrosion life of the equipment can generally reach more than 15 years.

Technological process

Process description

1. Grille pool: responsible for intercepting floating miscellaneous goods in sewage to ensure the normal operation of subsequent treatment equipment.

2. Regulating tank: used to regulate water quality and quantity. Generally, the capacity of the regulating tank is 6-10 times the processing capacity per hour, and it is lifted to the anoxic tank by a lift pump.

3. Anoxic tank (Class A): The anoxic tank is designed for denitrification treatment. The sewage separated by the grid is pumped into the anoxic tank by the sewage lift pump in the regulating tank and mixed with the reflux nitrification liquid in the tank. Rope shaped biological packing is placed in the anoxic tank as a carrier for denitrifying bacteria to control nitrogen; Phosphorus; The removal effect of sulfides is good, with a residence time of 1.5 hours, combined with the sludge tank in the previous process to form the AO treatment process, thereby achieving the purpose of phosphorus and nitrogen removal.

4. Biological contact oxidation tank (Grade O): It is divided into two stages with a total biochemical time of 6 hours. Rope type biological packing is used, which has the characteristics of large specific surface area and high porosity, which is conducive to microbial growth and treatment of a load of 30kg BOD/m3d, which is more than 7 times that of general elastic packing. The biochemical tank adopts a central gallery microporous explosion gas, and the sewage continuously circulates in the biochemical tank, fully contacting the organisms on the packing to achieve rapid degradation of organic matter.

5. Secondary sedimentation tank: The biochemical wastewater enters the secondary sedimentation tank, which is designed with a surface load of 0.9-1.2m3/m2h and a toothed collection tank. The tank collects water evenly and produces good effluent. The sludge in the secondary sedimentation tank is lifted to the sludge tank and Class A using an external reflux pump.

6. Disinfection pool: The residence time is 30 minutes, and the disinfectant used is solid chlorine pills or bleach powder.

7. Sludge tank: The pollutants intercepted by the grid and the sludge from the secondary sedimentation tank enter the sludge tank, which is equipped with a sludge digestion system. The clear liquid on the sludge tank flows back to the regulating tank.

8. The fan and distribution cabinet are both located in the equipment room. Generally, there are two fans running alternately in the equipment room. When one fan fails, the other can start the equipment on its own and continue to operate; When the sewage is cut off, the fan can automatically stop running to protect the normal growth of organisms.

Detailed parameters