Page 78 - 2016地大报告-电子书

2016

dominant in the reactor. Six different bacterial strains were randomly isolated from the reactor.

Function and gene analysis indicated that all the isolates possess arsenite-oxidizing activity,
and five of them are chemoautotrophic. Further analysis showed that a large diversity of AioAs

and two types of RuBisCOs are present in the microbial community. This suggests that many
chemoautotrophic arsenite-oxidizing microorganisms were responsible for quick oxidation o

f arsenite in the reactor. We also found that the reactor is easily regenerated and its number is
readily expanded. To the best of our knowledge, the arsenite-oxidizing efficiency, which was

expressed as the minimum time for complete oxidization of a certain concentration of As(III)
under a single operation, of this bioreactor is the highest among the described bioreactors; it

is also the most stable, economic and environment-friendly. (C) 2016 Elsevier Ltd. All rights
reserved.

论文链接：https://doi.org/10.1016/j.watres.2016.05.058
16. Wastewater sludge dewaterability enhancement using hydroxyl aluminum

conditioning: Role of aluminum speciation
作 者：Cao, BD (Cao, Bingdi )[ 1 ] ; Zhang, WJ ( 张伟军 ) [ 2 ] ; Wang, QD (Wang,

[ 2 ]
Qiandi) [ 2 ] ; Huang, YR (Huang, Yangrui) [ 2 ] ; Meng, CR(Meng, Chenrui) ; Wang, DS (Wang,
Dongsheng) [ 2 ]

摘 要：Chemical conditioning is one of the most important processes for
improve the performance of sludge dewatering device. Aluminum salt coagulant has

been widely used in wastewater and sludge treatment. It is generally accepted that pre-
formed speciation of aluminum salt coagulants (ASC) has an important influence

on coagulation/flocculation performance. In this study, the interaction mechanisms
between sludge particles andaluminum salt coagulants with different speciation of h

ydroxy aluminum were investigated by characterizing the changes in morphological
and EPS properties. It was found that middle polymer state aluminum (Al-b) and high

polymer state aluminum (Al-c) performed better than monomer aluminumand oligomeric
state aluminum (Al-a) in reduction of specific resistance to filtration (SRF) and compressibil

ity of wastewater sludge due to their higher charge neutralization and formed more compact
flocs. Sludge was significantly acidified after addition Al-a, while pH was much more stable

under Al-b and Al-c conditioning due to their hydrolysis stability. The size of sludge flocs
conditioned with Al-b and Al-c was small but flocs structure was denser and more compact,

and floc strength is higher, while that formed from Ala is relatively large, but floc structure was

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