Hospital sewage treatment method

Hospital sewage, in addition to general domestic sewage, also contains chemical substances, radioactive wastewater and pathogens. Therefore, it must be treated before discharge, especially hepatitis and other infectious diseases wards discharged sewage, must be sterilized before discharge. Hospital departments have different functions, facilities and staff composition, the main departments and facilities that produce sewage are: diagnostic and treatment rooms, laboratories, wards, laundries, X-ray photographic washing and printing, animal rooms, isotope treatment and diagnosis, operating rooms and other drainage. Different departments and sections of the sewage generated by the composition and volume of water are different, such as heavy metal wastewater, oily wastewater, printing and washing wastewater, radioactive wastewater, etc.

There are three types of basic methods of medical wastewater treatment: physical method, chemical method and microbiological method, the hospital is more often used in the chemical method, the physical method is mainly for the hospital wastewater for sedimentation, separation, hot and cold treatment and other operations. Chemical methods are more widely used in hospital wastewater treatment, the current commonly used methods include: chlorination disinfection, oxidant disinfection, radiation disinfection, etc. Microbial treatment method as the current science and technology higher value-added methods, gradually favored by people.

Physical treatment methods

1. Sedimentation and filtration method

Sedimentation method is an important aspect of the physical treatment of medical wastewater, the main principle is to use the density of suspended sewage in medical wastewater and pollutants are different, in accordance with the principle of gravitational sedimentation and levitation of the suspended medical sewage to separate out. The use of filter media to intercept the suspended matter in the sewage. Filter media are steel bars, screen, sand cloth, plastic, microporous tubes, etc. Commonly used filtration equipment are grates, grids, microfilters, sand filters, vacuum filters, filter presses, etc., to separate the sewage out.

Centrifugal separation method

In hospital medical wastewater treatment, sewage containing suspended pollutants in high-speed rotation, due to the suspended particles (such as emulsified oil) and sewage is subject to the centrifugal force of different sizes and is separated from the method. Commonly used centrifugal equipment according to the centrifugal force generated by the way can be divided into two kinds: by the water itself rotates to generate centrifugal force for the cyclone separator, by the equipment rotates at the same time also drive the liquid rotation to generate centrifugal force for the centrifugal separator. Cyclone separator is divided into pressure type and gravity type. Because it has the advantages of small size and high processing capacity per unit volume. There are many types of centrifuges, according to the separation factors are normal speed centrifuges and high-speed centrifuges.