论文部分内容阅读
针对闽江水质特征,开发了混凝/沉淀/超滤一体化装置,并通过中试考察其在低温水质期对闽江水的净水效能。试验结果显示:在水温为9~15℃的低温水质期,一体化装置运行稳定之后,出水浊度平均为0.085 NTU,远低于水厂传统工艺出水浊度;出水COD_(Mn)平均为1.34 mg/L,对CODMn的平均去除率为58.8%;超滤对细菌的去除率可达99%以上,出水菌落总数最大不超过3 CFU/m L。低温水质时期系统的平均产水率为95.9%;恢复性化学清洗(CIP)能够有效缓解膜污染,提高超滤膜的过滤性能,CIP之后的出水浊度显著改善,膜通量提高了11.9%。水温会影响超滤膜的过滤性能,11.0℃时的膜比通量为14.4℃时的88%左右,水温越低,超滤系统的膜比通量就越小;通过缩短过滤时间或增加反冲洗时间可以提高超滤膜通量,增加系统的反冲洗时间对提高系统通量的效果更好,且耗电量的增加量也相对较小。
According to the characteristics of water quality of Minjiang River, a coagulation / sedimentation / ultrafiltration integrated device was developed and the water purification efficiency of Minjiang River water was evaluated through the pilot test. The results showed that the average turbidity of the effluent was 0.085 NTU after the operation of the integrated plant was stable at the low temperature of 9-15 ℃ and far below the turbidity of the effluent of the traditional water treatment plant. The average effluent COD Mn was 1.34 mg / L, the average removal rate of CODMn was 58.8%. The removal rate of bacteria by ultrafiltration was over 99%, and the total number of effluent colonies did not exceed 3 CFU / m L. The average water yield of the system was 95.9% at low temperature and water quality. CIP was effective in alleviating membrane fouling and improving the filtration performance of ultrafiltration membrane. The turbidity of effluent after CIP was significantly improved and membrane flux increased by 11.9% . Water temperature will affect the ultrafiltration membrane filtration performance, 11.0 ℃ when the membrane specific flux of 14.4 ℃ when the 88%, the lower the water temperature, ultrafiltration membrane flux than the smaller; by reducing the filtration time or increase the anti Flushing time can increase the ultrafiltration membrane flux, increase the system backwash time to improve the system flux better, and the increase of power consumption is relatively small.