RECOVERY OF EXTRACELLULAR POLYMERIC SUBSTANCE: IMPACT FACTORS IN FORWARD OSMOSIS SEPARATION OF SODIUM ALGINATE

CAO Da-qi; SUN Xiu-zhen; FANG Xiao-min; JIN Jing-yi; YANG Xiao-xuan; HAO Xiao-di

doi:10.13205/j.hjgc.202008012

Volume 38 Issue 8

Nov. 2020

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Article Navigation > ENVIRONMENTAL ENGINEERING > 2020 > 38(8): 71-75

CAO Da-qi, SUN Xiu-zhen, FANG Xiao-min, JIN Jing-yi, YANG Xiao-xuan, HAO Xiao-di. RECOVERY OF EXTRACELLULAR POLYMERIC SUBSTANCE: IMPACT FACTORS IN FORWARD OSMOSIS SEPARATION OF SODIUM ALGINATE[J]. ENVIRONMENTAL ENGINEERING , 2020, 38(8): 71-75. doi: 10.13205/j.hjgc.202008012

Citation:

CAO Da-qi, SUN Xiu-zhen, FANG Xiao-min, JIN Jing-yi, YANG Xiao-xuan, HAO Xiao-di. RECOVERY OF EXTRACELLULAR POLYMERIC SUBSTANCE: IMPACT FACTORS IN FORWARD OSMOSIS SEPARATION OF SODIUM ALGINATE[J]. ENVIRONMENTAL ENGINEERING , 2020, 38(8): 71-75. doi: 10.13205/j.hjgc.202008012

Citation:

CAO Da-qi, SUN Xiu-zhen, FANG Xiao-min, JIN Jing-yi, YANG Xiao-xuan, HAO Xiao-di. RECOVERY OF EXTRACELLULAR POLYMERIC SUBSTANCE: IMPACT FACTORS IN FORWARD OSMOSIS SEPARATION OF SODIUM ALGINATE[J]. ENVIRONMENTAL ENGINEERING , 2020, 38(8): 71-75. doi: 10.13205/j.hjgc.202008012

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RECOVERY OF EXTRACELLULAR POLYMERIC SUBSTANCE: IMPACT FACTORS IN FORWARD OSMOSIS SEPARATION OF SODIUM ALGINATE

doi: 10.13205/j.hjgc.202008012

Sino-Dutch R & D Centre for Future Wastewater Treatment Technologies/Key Laboratory of Urban Stormwater System and Water Environment, Beijing University of Civil Engineering and Architecture, Beijing 100044, China

Received Date: 2020-03-20

Abstract

Abstract

Extracellular polymeric substances (EPSs) in excess sludge have great recycling value. However, the solutions of recycled EPSs afford the moisture contents of nearly 100% and therefore the dehydration of these solutions is an urgent problem. Forward osmosis (FO) membrane separation having advanteges of low membrane fouling, high concentration efficiency, and high concentration resistance, has become a novel low-energy dewatering technology. A novel dead-end FO concentration method was proposed and the FO dewatering of simulated EPS (sodium alginate) was investigated. The results showed that the decline rate of flux deceased when the active layer of FO membrane was towards the feed side; similar to external pressure drive, the cross flow mode could reduce FO membrane fouling and improve flux; the spacer, which was used for preventing the tensile deformation of the FO membrane, should be designed reasonably such as the appropriate holed ratio to reduce the flux decline; the mitigation of FO membrane fouling with Ca²⁺ addition was insignificant although it was reduced, different from the external pressure drive.
- extracellular polymeric substance,
- recovery,
- forward osmosis,
- membrane fouling,
- sodium alginate

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References(19)

References

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