Underground integrated sewage treatment equipment

Underground integrated sewage treatment equipmentThe sewage from the living area is treated with a grid (net) to remove hair, skin, floating slag, and large suspended particles from the sewage, and then flows into the oil separation tank. After removing most of the oil and mud, it flows into the regulating tank. The regulating tank ensures the normal operation of the subsequent treatment facilities and achieves the designed effluent quality, while also regulating the water volume and homogenizing the water quality. The water from the regulating tank is pumped up to the laminar flow air flotation sedimentation integrated machine. The suspended solids (SS) in the water are removed in advance, with a removal rate of over 90%. The effluent enters the integrated domestic sewage treatment equipment, which consists of a hydrolysis acidification tank, a secondary contact oxidation tank, and a sedimentation tank

Biochemical treatment mainly uses aerobic treatment to remove the vast majority of organic matter in wastewater by relying on the adsorption and degradation of aerobic microorganisms, while providing sufficient dissolved oxygen in the wastewater.

The aerobic biological treatment methods for wastewater are mainly divided into activated sludge method and biofilm method, both of which are commonly used domestically and internationally and have relatively mature processes. The biofilm method is divided into three categories based on the attachment of different biofilm materials: biological disc, biological filter, and contact oxidation method. With the development of the chemical industry, biological fillers are constantly being updated, from the original plastic honeycomb fillers to soft fillers and then to semi soft fillers. The contact oxidation method is becoming increasingly effective. Due to the rich biological phase of contact oxidation, especially in low concentration wastewater treatment, the contact oxidation method has gradually replaced the activated sludge method. The contact oxidation method has the following characteristics:

·Rich biological phase: There is abundant dissolved oxygen and organic matter in the contact oxidation tank. Under the intense mixing of gas and water, the mass transfer process of organic matter is accelerated, and the renewal of membrane surface water and biofilm is conducive to the growth and proliferation of microorganisms. Therefore, the biological phase on the biofilm is very rich. There are bacteria, jersey bacteria, filamentous fungi, protozoa, and metazoa, forming a rich and stable food chain of organic matter bacteria protozoa and metazoa.

·High concentration of biomass: Biological fillers have a large specific surface area. Under the conditions of uniform air distribution and sufficient aeration intensity, the fillers are covered by active biofilm, forming a large biofilm main structure, which is conducive to maintaining the purification function of the biofilm. According to statistics, the biomass in the contact oxidation tank is about 3-7 times that of the activated sludge process.

·The process flow is simple, the equipment operation is reliable, and the operation is easy: the contact oxidation method has rich biological phases and high concentrations of biomass, and has a high volumetric load in operation, and can adapt to the impact of high loads, resulting in less sludge generation. Due to the much better settling performance of attached biofilm carriers compared to activated sludge, filamentous bacteria attached to the membrane are less likely to cause sludge swelling hazards. And it has a certain ability to remove phosphorus and nitrogen, which can ensure the quality of the effluent. Basically, there is no need for residual sludge reflux, which is easy to manage, does not produce mosquitoes or flies, does not emit odors, is not easy to block, and runs smoothly. The filler has strong corrosion resistance, low cost, small size, light weight, strong adaptability, and good treatment effect.

·It has strong resistance to shock loads caused by changes in sewage quality and quantity, and has a significant buffering effect on pH and toxic substances.