Hospital wastewater after treatment and disinfection, should meet the following standards: a. Three consecutive samples of 500 ml each for testing, shall not detect intestinal pathogenic bacteria and tuberculosis bacilli.
Total coliforms shall not be greater than 500 per liter.
When chlorination is used for disinfection, the contact time and residual chlorine content in the effluent water of the contact pool shall meet the requirements of Table 2-02:
Sludge in the sewage treatment structure must be treated harmlessly, and the sludge discharge shall meet the following standards:
The mortality rate of ascaris lumbricoides eggs is greater than 95%; second, the value of fecal coliform bacteria is not less than 10 -2; Third, per 10 grams of sludge (in the original test sample), enteric pathogenic bacteria and tuberculosis bacilli shall not be detected.
When sludge is composted using high-temperature composting method for harmless treatment, the temperature of the compost must be greater than 50 ℃, and should last for more than 5 days.
Hospitals without upper or lower sewerage facilities or centralized sewage treatment structures must carry out separate disinfection or other harmless treatment of infectious feces. Article 2.0.6 hospital sewage after treatment and disinfection, the content of pollutants and harmful substances contained therein shall comply with the requirements of the current relevant standards.
New standards
1, the new standards of sewage, waste gas and sludge generated by hospitals to carry out comprehensive control, emphasizing the disinfection of pathogen-containing wastewater at the same time, taking into account the safety of the ecological environment.
2, in the biological indicators, the new standard on the discharge into the sewer and into the water body of hospital sewage put forward different requirements. The new standard strictly differentiate between the nature of the hospital, while according to the sewage destination is divided into two levels, and on the basis of the original standard put forward strict control of indicators at all levels.
3, the new standard takes into account the effect of disinfection and ecological safety issues, for different nature of hospitals and sewage destination of disinfection time and chlorine residual amount are clearly defined, strict chlorine residual standard upper limit.
4, in the physical and chemical indicators, discharged into surface water bodies of hospital sewage and infectious disease hospital sewage COD, BOD5, SS, animal and plant oils, petroleum, anionic surfactants and other indicators are based on the original standard for strict control, in order to enhance the sewage treatment system of the risk of resistance. Considering that ammonia nitrogen also consumes disinfectants, strict requirements have also been imposed on ammonia nitrogen.