EFFECT OF FREEZING/THAWING PRETREATMENT ON EXCESS SLUDGE DISINTEGRATION AND TREATMENT EFFICIENCY OF MICROBIAL ELECTROLYSIS CELL

SUN Xing; HU Kai; LEI Chen-yu; CHEN Wei

doi:10.13205/j.hjgc.202104023

Volume 39 Issue 4

Jul. 2021

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SUN Xing, HU Kai, LEI Chen-yu, CHEN Wei. EFFECT OF FREEZING/THAWING PRETREATMENT ON EXCESS SLUDGE DISINTEGRATION AND TREATMENT EFFICIENCY OF MICROBIAL ELECTROLYSIS CELL[J]. ENVIRONMENTAL ENGINEERING , 2021, 39(4): 147-155. doi: 10.13205/j.hjgc.202104023

Citation:

SUN Xing, HU Kai, LEI Chen-yu, CHEN Wei. EFFECT OF FREEZING/THAWING PRETREATMENT ON EXCESS SLUDGE DISINTEGRATION AND TREATMENT EFFICIENCY OF MICROBIAL ELECTROLYSIS CELL[J]. ENVIRONMENTAL ENGINEERING , 2021, 39(4): 147-155. doi: 10.13205/j.hjgc.202104023

Citation:

SUN Xing, HU Kai, LEI Chen-yu, CHEN Wei. EFFECT OF FREEZING/THAWING PRETREATMENT ON EXCESS SLUDGE DISINTEGRATION AND TREATMENT EFFICIENCY OF MICROBIAL ELECTROLYSIS CELL[J]. ENVIRONMENTAL ENGINEERING , 2021, 39(4): 147-155. doi: 10.13205/j.hjgc.202104023

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EFFECT OF FREEZING/THAWING PRETREATMENT ON EXCESS SLUDGE DISINTEGRATION AND TREATMENT EFFICIENCY OF MICROBIAL ELECTROLYSIS CELL

doi: 10.13205/j.hjgc.202104023

SUN Xing^1,2,
HU Kai^{1,2
,
,},
LEI Chen-yu^1,2,
CHEN Wei^1,2

1. Key Laboratory of Integrated Regulation and Resource Development on Shallow Lake of Ministry of Education, Hohai University, Nanjing 210098, China;
2. College of Environment, Hohai University, Nanjing 210098, China

Received Date: 2020-08-28
Available Online: 2021-07-21

Abstract

Abstract

In this study, freezing/thawing pretreatment was adopted to disrupt sludge matrix in order to improve hydrolysis rate and degradation of organic matter in microbial electrolysis cell (MEC) feeding with excess sludge. The influence of freezing/thawing on sludge characteristics and performance of subsequent MEC was discussed. The results showed that freezing/thawing pretreatment could effectively promote the floc disintegration, cell rupture and organics dissolution of the sludge. When being freezed at -18℃ for 72 h and then thawed at 26℃ for 3 h, the SCOD content in the sludge increased by 2.58 times. At applied voltage of 0.7 V, with freezing/thawing-pretreated sludge as the substrate, the removal rates of SS and TCOD in MEC exceeded 40% and 60%, respectively. Compared with raw sludge, the pretreatment increased coulomb efficiency and cathode hydrogen recovery in MEC by 5.8% and 6.7%, respectively. Microbial community analysis showed that freezing/thawing pretreatment facilitated the enrichment of exoelectrogens (including Proteobacteria and Firmicutes) in MEC, therefore improved the overall utilization and energy recovery from excess sludge via MEC.
- freezing/thawing pretreatment,
- excess sludge,
- microbial electrolysis cell,
- microbial community structure,
- sludge disintegration

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References(34)

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