Pilot study on treatment of low turbidity and low temperature water by coagulation-immersed membrane process

KANG Hua¹, HE Wen-jie^1,2, HAN Hong-da², LI Chen³

1.School of Municipal and Environmental Engineering,Harbin Institute of Technology,Harbin 150090,China;2.Tianjin Water Group Corp.,Tianjin 300040,China;3.School of Environmental and Municipal Engineering,Xi’an University of Architecture and Technology,Xi’an 710055,China



Abstract:

The objective of this paper was to investigate the practicability of coagulation-immersed membrane process during low-temperature period through the study of steady operation,chemical cleaning methods,water quality and agent consumption.Experimental results showed that:membrane performance decreases with the reduction of temperature,but low temperature has little effect on stable operation of immersed membrane when coagulation as pretreatment.EFM with 1200 mg/L sodium hypochlorite after every 48 filtration cycles was made for reducing membrane fouling efficiently,and the method,with 1.5% sodium hydroxide and 3500 mg/L sodium hypochlorite for 10 h and then 2% hydrochloric acid for 4 h,is an appropriate cleaning method under low temperature.Compared with convention treatment process,immersed membrane process not only has same agent consumption,but also permeated water quality is more superior such as fine removal effect on turbidity with average 0.10 NTU.Therefore,coagulation-immersed membrane process is more appropriate for increasing water quality demand and the treatment of low turbidity and low temperature water.

Key words:  low temperature  coagulation-immersed membrane process  filter performance  chemical cleaning  water quality

DOI：10.11916/j.issn.1005-9113.2011.02.008

Clc Number:TU991.2

Fund: