采用机械加速澄清池+多介质过滤器+活性炭过滤器+CM大表面积块片式陶瓷超滤膜+反渗透工艺处理化工无机废水。60d连续运行期间,CM陶瓷超滤膜产水SDI_(15)在1.1~1.6之间,浊度在0.01~0.03 NTU之间,运行压差由44 k Pa上升至67 kPa。CM陶瓷...采用机械加速澄清池+多介质过滤器+活性炭过滤器+CM大表面积块片式陶瓷超滤膜+反渗透工艺处理化工无机废水。60d连续运行期间,CM陶瓷超滤膜产水SDI_(15)在1.1~1.6之间,浊度在0.01~0.03 NTU之间,运行压差由44 k Pa上升至67 kPa。CM陶瓷超滤膜产水水质完全满足反渗透系统进水水质要求。反渗透系统产水水质优异,完全满足GB 50335-2002中关于"再生水用作循环冷却用水的水质控制指标"的要求。与传统陶瓷膜产品相比,CM-131陶瓷膜具有更大的表面积。CM-131陶瓷超滤膜作为反渗透的预处理工艺,其安装、运行、反洗方式类同于传统中空纤维超滤膜。CM陶瓷超滤膜不存在断丝问题,孔径分布、操作压力、温度、系统回收率、耐油性、耐腐蚀性、产水SDI值、使用寿命等方面均优于中空纤维超滤膜。展开更多
Here the effect of solid retention time(SRT) on the concentration of the mixed liquor suspend solid(MLSS),the sludge characteristics,the content of extra-cellular polymeric substances(EPS),the viscosity of mixed liquo...Here the effect of solid retention time(SRT) on the concentration of the mixed liquor suspend solid(MLSS),the sludge characteristics,the content of extra-cellular polymeric substances(EPS),the viscosity of mixed liquor and effluent quality in the immersed membrane bioreactor(IMBR) was investi-gated.The results indicate that the increase of the EPS content is the main reason for the increase of mixed liquor viscosity,the former is positively correlated with the latter(R2 = 0.9751).The size distribution profile of particles in the mixed liquor presents double-peak shape at SRT more than 30 days.The filtration resistance of membrane in IMBR is mainly caused by the tiny particles and the viscosity of the mixed liquor.In this study,the extension of SRT can hardly affect the removal efficiency of Chemical Oxygen Demand(COD) and NH+4―N,and when SRT is below 30 days,silt density index(SDI15) is less than 3,the effluent can be deeply treated by using reverse osmosis system(RO) or nano-filtration system(NF).The method of controlling SRT is put forward by analyzing the relationship between SRT and the minimum generation-time of dominant bacteria(at the maximum specific growth rate under the operation temperature).展开更多
基金Supported by Natural Science Foundation of Tianjin (Grant No.08JC2DJC24300)
文摘Here the effect of solid retention time(SRT) on the concentration of the mixed liquor suspend solid(MLSS),the sludge characteristics,the content of extra-cellular polymeric substances(EPS),the viscosity of mixed liquor and effluent quality in the immersed membrane bioreactor(IMBR) was investi-gated.The results indicate that the increase of the EPS content is the main reason for the increase of mixed liquor viscosity,the former is positively correlated with the latter(R2 = 0.9751).The size distribution profile of particles in the mixed liquor presents double-peak shape at SRT more than 30 days.The filtration resistance of membrane in IMBR is mainly caused by the tiny particles and the viscosity of the mixed liquor.In this study,the extension of SRT can hardly affect the removal efficiency of Chemical Oxygen Demand(COD) and NH+4―N,and when SRT is below 30 days,silt density index(SDI15) is less than 3,the effluent can be deeply treated by using reverse osmosis system(RO) or nano-filtration system(NF).The method of controlling SRT is put forward by analyzing the relationship between SRT and the minimum generation-time of dominant bacteria(at the maximum specific growth rate under the operation temperature).
