Research On Effect Of Disinfection Of Reclaimed Water On Corrosion In Circulating Cooling Water System

Currently, the water shortage, water pollution as a constraint to economic and social development in China an important factor. At the same time, urban sewage water because of its stability, water stability, a reliable source of reclaimed water much attention, combined with the recycled water treatment technologies and processes are more mature. However, the disinfection of municipal wastewater treatment by the depth of its water quality of reclaimed water reuse system differences will have more or less affected. Therefore, this paper through the municipal sewage MBR+weak acid ion-exchange of oxygen after the recycled water by four different disinfectants (chlorine dioxide, sodium hypochlorite, isothiazolin-ketone, and quaternary ammonium salt) with a back problem after disinfection, sterilization, respectively, analysis of different agent after disinfection, water quality and water quality changes in corrosion of the impact of reuse system. Detail, in Chapter3, The effects of different disinfectants and microorganisms in water after anion changes; in Chapter4, through static experimental study of different disinfectants on A3carbon steel and316L stainless steel I-standard test piece corrosion, the results show that the optimal dosage of sodium hypochlorite for the16mg/l, chlorine dioxide is the best dosage of16mg/l, isothiazolin-ketone of the optimal dosage micro-120mg/l, ammonium salt of the most good dosage of180mg/l; in Chapter5, experimental studies through four different dynamic disinfectant after disinfection of reclaimed water to the circulatory system, the results showed that sodium hypochlorite disinfection and chlorine dioxide disinfection of water will be back corrosion rate with a relatively large system, the flow between the two different corrosion rates are higher than the quaternary ammonium thiazolidinone and reuse water after disinfection, resulting in both a disinfectant water back after the corrosion rate is mainly due to relatively large the role of NH4+, which is different from the conventional experiments the greatest impact on the corrosion rate is C1-this view.