1, aeration biofilter method
Hospital sewage mainly from the consultation room, ward, laboratory, operating room, laundry, administration and canteen, dormitory and other discharges of sewage, the main pollutants for organic pollutants, pathogenic microorganisms and viruses. Hospital sewage is now only by the grating and disinfection after treatment both discharge, the use of chlorine dioxide disinfectant, residual chlorine and bacteriological indicators can meet the standard, but the organic matter has not been removed.
In order to fully meet the standards, the hospital added aeration biofilter sewage treatment process to treat sewage. Considering the hospital wastewater treatment plant occupies a limited area and the water contains a certain amount of disinfectant characteristics, it was decided to take a high load, occupies a small area, the influent organic concentration range of adaptability of the money of the aeration biofilter process.
Aerated biofilter has the following characteristics:
(1) high organic load, occupies an area of less
(2) large biomass, high activity, shock resistance
(3) with biodegradation and filtration of the double function of the reaction, do not need to be a second sedimentation tank
(4) due to the cutting of the filter media, the high rate of oxygen utilization
(5) Stable and reliable operation, convenient management
2, chlorination method
(1) sodium hypochlorite method. Sodium hypochlorite is a common chemical reagent, transportation, storage and purchase are relatively convenient. Sodium hypochlorite dissolved in water to produce hypochlorite ion, can be used for disinfection and sterilization, but it is not stable, light, moisture is easy to decomposition, disinfection ability is very weak.
(2) liquid chlorine method. Liquid chlorine in water can quickly produce hypochlorite ion. The method is now widely used in hospital sewage disinfection. The effective chlorine content in liquid chlorine is 5-10 times higher than that of sodium hypochlorite solution, with strong disinfection capacity and cheap. Since chlorine is a strong irritating toxic gas, it should be stored in special storage equipment.
(3) Chlorine dioxide method. Chlorine dioxide is a strong oxidizing agent, which can kill bacteria, propagules, fungi and viruses. Relevant research shows that chlorine dioxide dissolved in water, 50% -7o% transformed into hypochlorite ion and chlorite ion, damage to red blood cells, will interfere with the body's absorption of iodine, but also can make the blood cholesterol rise. Therefore, at present, the first two methods are generally used to treat hospital sewage.
Expanded Information
Principles of treatment
1, the principle of whole process control. The whole process of hospital sewage generation, treatment and discharge control.
2, the principle of reduction. Strict hospital internal health and safety management system, strict control and separation of sewage and dirt at the source of the occurrence of sewage, hospital sewage and sewage collected separately from the sick area, that is, the source control, sewage diversion.
It is strictly prohibited to dispose of the hospital's sewage and dirt into the sewers at will.
3, the principle of local treatment. In order to prevent pollution and hazards in the hospital sewage conveyance process, in the hospital must be treated locally.
4, the principle of classification guidance. According to the nature of the hospital, scale, sewage discharge and regional differences in hospital sewage treatment for classification guidance.
5, the principle of standardization and risk control. Comprehensive consideration of general hospitals and infectious disease hospitals to meet the basic requirements of sewage discharge, while strengthening the awareness of risk control, process technology, engineering construction and supervision and management to improve the ability to deal with unexpected events.
6, the principle of ecological safety. Effective removal of toxic and hazardous substances in sewage, reduce disinfection by-products in the treatment process and control of excessive residual chlorine in the effluent, to protect the ecological environment.
Baidu Encyclopedia - Hospital Sewage Treatment