Hospital comprehensive sewage treatment equipment - selection criteria:
（1） Select the process based on the size, nature, and discharge direction of the hospital's wastewater treatment. According to hospital classification, it is divided into infectious disease hospitals and comprehensive hospitals. The discharge direction of hospital sewage after treatment is divided into two categories: discharging into natural water bodies and discharging into urban sewage treatment plants through municipal sewers.
1. Infectious disease hospitals must adopt secondary treatment and carry out pre disinfection treatment.
2. Hospitals at or above the county level that discharge treated effluent into natural water bodies must adopt secondary treatment.
3. Comprehensive hospitals that discharge treated effluent into urban sewers (downstream with secondary sewage treatment plants) recommend using secondary treatment, and for those using primary treatment processes, the treatment effect must be strengthened.

4. For small comprehensive hospitals in economically underdeveloped areas, simple biochemical treatment can be used as a transitional measure when conditions are not available, and then gradually achieve secondary treatment or primary treatment with enhanced treatment effects.

Okunlai Hospital Comprehensive Sewage Treatment EquipmentThe secondary processing technology

(1) Process description

The secondary treatment process is "regulating tank → biological oxidation → contact disinfection". The hospital sewage enters the regulating tank through the septic tank. Automatic grille is installed at the front of the regulating pool. A lifting water pump is installed in the regulating tank. After the sewage is lifted, it enters the aerobic tank for biological treatment. The effluent from the aerobic tank enters the contact tank for disinfection, and the effluent meets the discharge standards.

The sludge and slag generated in the sewage treatment station, such as the regulating tank, biochemical treatment tank, and contact tank, are centrally disinfected and transported for incineration. Disinfection can be achieved through methods such as pasteurization with steam or adding lime.

Collect sewage and feces from infectious disease hospitals separately. Domestic sewage directly enters the pre disinfection tank for disinfection treatment and then enters the regulating tank. The patient's feces should be independently disinfected first and then enter the septic tank or treated separately through the sewer (as shown in the dashed line). Each structure must operate in a sealed environment and be ventilated through a unified ventilation system. Waste gas is discharged after disinfection, which can be achieved through a UV disinfection system.

(2) Process characteristics

The aerobic biochemical treatment unit removes organic pollutants such as CODCR and BOD5. Aerobic biochemical treatment can choose contact oxidation, activated sludge, and high-efficiency aerobic treatment processes, such as membrane bioreactors, aerated biofilters, etc. By adopting an efficient aerobic treatment process with filtering function, the concentration of suspended solids can be reduced, which is beneficial for subsequent disinfection.

(3) Scope of application

Suitable for sewage treatment in infectious disease hospitals (including comprehensive hospitals with infectious disease wards) and comprehensive hospitals discharging into natural water bodies.