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What to do if the residual chlorine in the sewage treatment plant exceeds the standard

by:BOQU     2023-03-27
When urban sewage treatment plants accept medical sewage, there may be excessive residual chlorine in the influent, which will lead to the reduction or inhibition of activated sludge activity and affect the normal operation of biological treatment units. Therefore, it is necessary to strengthen the observation of activated sludge properties, and the proportion of hospital sewage High sewage plants should also monitor the residual chlorine in the influent. When the residual chlorine content in the influent is high, measures can be taken to appropriately increase the sludge return ratio, reduce the excess sludge discharge, increase the sludge concentration, and appropriately increase the aeration rate. If necessary, fresh sludge should be added. Before entering the biochemical system, add reducing agent for dechlorination to ensure the effect of sewage treatment. Chlorine can kill harmful organisms in sewage and beneficial organisms in natural water bodies, so it is necessary to control the amount of total residual chlorine, not as much as possible. In other words, when it comes to the use of disinfectants, especially chlorine-containing disinfectants, sewage treatment units must strictly abide by the lower limit and use them in sufficient quantities to ensure the disinfection and sterilization effect; they must also control the upper limit and use them appropriately to avoid other negative impacts on the water environment. Urban sewage treatment plants should ensure the stable operation of existing disinfection units. For sewage treatment plants without disinfection units, emergency disinfection devices should be added according to local conditions. For example, measures such as adding chlorine-containing disinfectants or ozone disinfection devices to the effluent can be taken to ensure sufficient disinfection contact time; for those using ultraviolet disinfection, it is recommended to increase ultraviolet rays Irradiation intensity, or temporarily increase chlorine-containing disinfection facilities at the water outlet; ensure that the number of fecal coliforms in the effluent meets the requirements of the 'Pollutant Discharge Standards for Urban Sewage Treatment Plants' (GB 18918-2002). Strengthen the supervision of sewage treatment and improve the emergency plan. Pay close attention to the changes in the residual chlorine index of the wastewater treatment plant, and take targeted measures in a timely manner to ensure that the effluent meets the standard. Strengthen the control of disinfection process units and the disinfection of tail water to ensure that the tail water, especially the indicators of fecal coliform bacteria, meet the 'Pollutant Discharge Standards for Urban Sewage Treatment Plants' (GB18918-2002). Strengthen the inspection of the pipe network to reduce the risk of blockage of the sewage pipe network, ensure the smooth flow of the pipe network system, and promptly report and repair any problems found. Operation management and operators may come into contact with the production areas (sites) of sewage and sludge. While strengthening sanitation and cleaning, they should also spray and disinfect the operation area, temporary garbage storage area and the surrounding environment. Operation and management personnel should always wear protective equipment such as masks and gloves, wash hands frequently, disinfect frequently, and touch less.
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