A, the use of chlorine-containing disinfectant disinfection process control requirements:
① The contact time of disinfection contact pool of infectious diseases and tuberculosis medical institutions is ≥ 1.5h, and the total residual chlorine at the outlet of contact pool is 6.5-10mg/L. ..
② The contact time of disinfection contact tanks in general medical institutions and other medical institutions is ≥ 1h, and the total residual chlorine at the outlet of contact tanks is 3 3- 10 mg/L 0 mg/L. ..
(3) If it is directly discharged into surface water and sea areas, dechlorination shall be carried out to make the total residual chlorine less than 0.5mg/L, and no other disinfectants are needed for the total residual chlorine.
Free chlorine refers to chlorine in the form of hypochlorous acid, hypochlorite ions and dissolved elemental chlorine.
Combined chlorine refers to chlorine in the form of chloramine and organochloramine.
Total chlorine refers to the chlorine existing in the form of "free chlorine" or "combined chlorine" or both.
Chloramine refers to derivatives in which one, two or three hydrogen atoms of ammonia are replaced by chlorine atoms (such as monochloramine, dichloramine and nitrogen trichloride) and chlorinated derivatives of organic nitrogen compounds.
Chlorine dioxide interferes with the determination of free chlorine and total chlorine and chlorite interferes with the determination of total chlorine. Chlorine dioxide and chlorite can be corrected by measuring their concentrations. See GB/T 5750. 1 1 and GB/T 5750. 10.
Second, ultraviolet disinfection should be used, the concentration of suspended solids in sewage should be less than 10mg/L, the irradiation dose should be 30-40mJ/cm2, and the irradiation contact time should be longer than 10s or determined by experiments.
Third, ozone disinfection, the concentration of suspended solids in sewage should be less than 20mg/L, the ozone dosage should be greater than 65438 00 mg/L, and the contact time should be greater than 65438±02min or determined by experiments.
In addition, affected by the epidemic situation, the ecological and environmental protection department has strengthened the supervision of hospital sewage treatment and disinfection, and the online detection of total residual chlorine in drainage has reached the requirements of chlorine-containing disinfectants in infectious diseases and tuberculosis medical institutions, that is, the contact time of disinfection contact pool is ≥ 1.5h, and the total residual chlorine at the outlet of contact pool is 6.5-10 mg/L. Hospitals disinfected with chlorine dioxide have the same requirements whether they are discharged into water or not.