模拟泳池水中氯化消毒副产物的生成规律

Formation of disinfection by-products in chlorination of simulated swimming pool water

以模拟泳池水为研究对象,研究不同的氯化时间、氯投加量、pH值、反应温度条件对泳池水在氯化消毒过程中生成消毒副产物(DBPs)的影响.研究结果表明:延长氯化反应时间,二氯乙酸(DCAA)、三氯乙酸(TCAA)和三氯甲烷(TCM)的浓度不断升高,二氯乙腈(DCAN)、三氯硝基甲烷(TCNM)和1,1,1-三氯丙酮(1,1,1-TCP)的浓度则先升高再降低.DBPs浓度在氯化反应的前24h增幅较大,48h后趋于平缓;随着氯投加量的增加,DCAA、TCAA、TCM、TCNM和1,1,1-TCP浓度一直呈上升趋势,而DCAN浓度则先升高再降低.在氯投加量为2mg/L时,DBPs的浓度较低;在pH值从6升高到8的过程中,DCAA、TCAA、DCAN和1,1,1-TCP浓度先升高再降低,TCM和TCNM浓度则一直升高.pH值在6～7范围内可有效控制DBPs的形成;随着反应温度的升高,DCAA、TCAA、TCM和TCNM浓度持续升高,DCAN和1,1,1-TCP则逐渐降低.综上所述,应合理调节泳池水的氯化消毒条件,在保证舒适度的同时有效控制DBPs的生成.

The objective of present study was to investigate the formation of disinfection by-products by simulated swimming pool water chlorination process under different conditions. Evaluated factors included chlorination time, chlorine dosages, pH and reaction temperature. The concentration of DCAA, TCAA and TCM increased constantly, the concentration of DCAN, TCNM and 1,1,1-TCP increased firstly and then decreased with the prolonged chlorination time. The concentration of DBPs increased significantly within 24h of chlorination reaction, and became flat after 48h. In response to increased dosage of chlorine, the concentration of DCAA, TCAA, TCM, TCNM and 1,1,1-TCP showed a tendency of increase, but the concentration of DCAN increased firstly and then decreased. The concentration of DBPs was lower when the chlorine dosage was controlled at 2mg/L;With the pH increased from 6to 8, the concentration of DCAA, TCAA, DCAN and 1,1,1-TCP initially increased and then decreased, and the concentration of TCM and TCNM increased gradually. When the pH was between 6and 7, the formation of DBPs can be effectively controlled;With the increased of reaction temperature, the concentration of DCAA, TCAA, TCM and TCNM increased continuously, while the concentration of DCAN and 1,1,1-TCP decreased gradually. Overall, the chlorination conditions of the swimming pool water should be reasonably adjusted to effectively control the generation of DBPs and ensure the comfort level of the pool.