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Hospital wastewater treatment process

Release time:2019-12-17Author:admin

Hospital wastewater treatment process
1. The primary treatment process to strengthen the treatment effect
A, process
For general hospitals where the treated effluent enters the secondary treatment urban sewage treatment plant, it should strengthen its treatment effect, increase the removal rate of SS, and reduce the amount of disinfectant. Strengthening the primary treatment effect should be achieved in two ways: transforming the existing primary treatment process to enhance the removal effect and adopting the primary intensification treatment technology.
The transformation of the existing primary treatment process to enhance the treatment effect should be based on the actual situation, make full use of the existing treatment facilities, and modify the structure or operation mode of the septic tanks and contact tanks that are more commonly used in existing hospitals. Add some facilities from time to time to improve the treatment effect as much as possible in order to meet the discharge standards of hospital sewage treatment. First-level enhanced treatment For general hospital (without infectious ward) sewage treatment, the process of "pretreatment → first-level enhanced treatment → disinfection" can be used. Through coagulation sedimentation (filtration) to remove particles that carry viruses and germs, improve the disinfection effect and reduce the amount of disinfectant, so as to avoid the adverse impact of the excessive amount of disinfectant on the environment.
B, process characteristics
The first-level intensive treatment that enhances the treatment effect can improve the treatment effect, remove particles that carry viruses and germs, improve the effectiveness of subsequent deepening disinfection, and reduce the amount of disinfectant. Among them, the modification of the existing primary treatment process can make full use of existing facilities and reduce investment costs.
C 、 Scope of application
    The first-level enhanced treatment to enhance the treatment effect is suitable for general hospitals where the treated effluent ends up in the second-stage urban sewage treatment plant.
2. Secondary treatment process
A, process
The secondary treatment process is "regulation tank → biological oxidation → contact disinfection". Hospital sewage enters the conditioning tank through the septic tank. An automatic grille is set at the front of the adjustment tank. A lifting pump is set 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 reaches the standard and is discharged.
Wastes from sewage treatment stations such as control tanks, biochemical treatment tanks, contact tanks, and sludge, etc. are centrally disinfected and transported for incineration. Sterilization can be done by pasteurization or adding lime.
Sewage and feces from infectious disease hospitals are collected separately. Domestic sewage directly enters the pre-sterilization tank for disinfection and then enters the conditioning tank. Patient's feces should be independently disinfected first, then enter the septic tank through the sewer or be treated separately (as shown by the dotted line). Each structure must be operated in a closed environment. Ventilation is performed through a uniform ventilation system. Exhaust gas is discharged after disinfection. Ultraviolet disinfection systems can be used for disinfection.
B. Process characteristics
The aerobic biochemical treatment unit removes organic pollutants such as CODcr and BOD5. The aerobic biochemical treatment can be selected from contact oxidation, activated sludge, and efficient aerobic treatment processes, such as membrane bioreactors and aerated biological filters. Adopting a highly efficient aerobic treatment process with a filtering function can reduce the concentration of suspended solids, which is beneficial to subsequent disinfection.
C 、 Scope of application
    It is suitable for sewage treatment in infectious disease hospitals (including general hospitals with infectious wards) and general hospitals discharged into natural water bodies.
3.Simple biochemical treatment process
A, process
The simple biochemical treatment process is "biogas purification tank → disinfection". The biogas purification tank is divided into a solid-liquid separation zone, an anaerobic filter and a sedimentation filtration zone. The main functions of the three zones are to remove suspended solids, adsorb colloids and soluble substances, further remove and degrade organic pollutants, and then remove remaining suspended matters and degrade organic pollutants through precipitation and filtration units to ensure the quality of effluent. The generated biogas is treated differently according to the amount of gas. When the biogas produced by 1m3 of sludge reaches more than 15m3, it is collected and used; when the biogas produced by 1m3 of sludge is less than 15m3, it is collected and treated.
B, process characteristics
The biogas purification tank uses the principle of anaerobic digestion to degrade solid organic matter. The treatment efficiency of biogas purification tank is better than that of decay tank and biogas tank, with low cost, low power consumption and simple management.
C 、 Scope of application
As a transitional measure for sewage treatment in hospitals in remote mountainous areas and underdeveloped areas, secondary treatment or primary treatment with enhanced treatment effects will be gradually realized.
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