The hospital sewage is treated by septic tank and then enters the grid well of the sewage treatment plant. After removing suspended solids, cotton swabs, gauze, and fecal debris through the grille, it enters the sewage regulating tank。
The regulating tank is a steel-concrete structure with a pre aeration device installed inside. To prevent sludge deposition and increase dissolved oxygen in wastewater, microporous aeration method is adopted. After aeration, the sewage is lifted into the vertical flow primary sedimentation tank by an unobstructed submersible sewage pump。
Vertical flow typeThe sludge at the bottom of the sedimentation tank (with a moisture content of 95%) is transported by air lift to the sludge digestion tank for aerobic digestion treatment, and its supernatant flows into the biological contact oxidation tank by gravity for biochemical treatment.
The biological contact oxidation tank adopts a push flow type. The pool is equipped with semi soft filling material, which is easy to form conjunctiva, non clogging, and non balling. Use a fan to blow air for oxygen supply。
Contact oxidation technology utilizes microbial communities to attach to the surface of fiber fillers to form biofilms. Under aerobic conditions, wastewater flows through the surface of filter media, and organic matter in the wastewater is oxidized into inorganic carbon dioxide and water through microbial adsorption, oxidation, reduction, and synthesis processes. The main equipment is a semi soft packing and aeration system for maintaining aerobic bacteria。
The secondary sedimentation tank adopts a vertical flow inclined tube type。二The sludge at the bottom of the sedimentation tank is sent to the sludge digestion tank for aerobic digestion treatment by gas extraction method, and the supernatant enters the disinfection tank.
Add solid chlorine tablets (or sodium hypochlorite solution) to the disinfection pool for disinfection and sterilization treatment。
The sludge from both the primary and secondary sedimentation tanks is subjected to aerobic digestion treatment using a sludge digestion tank. The principle of aerobic digestion treatment is to mix and aerate sludge to reach its own oxidation stage, which is the endogenous respiration stage. After the endogenous respiration period, only inorganic non decomposing substances are present in the sludge, making the sludge tend towards a stable state. The purpose of aerobic digestion is to reduce the amount of sludge. Most of the sludge is converted into volatile substances such as CO2, NH3, H2, etc. through aerobic digestion.
After aerobic digestion, drug disinfection and sterilization treatment, the sludge is transported for disposal, and the sewage is treated byStandard discharge after disinfection treatment。
