PMID- 18456942
OWN - NLM
STAT- MEDLINE
DCOM- 20080605
LR  - 20190911
IS  - 0273-2289 (Print)
IS  - 0273-2289 (Linking)
VI  - 144
IP  - 2
DP  - 2008 Feb
TI  - Feasibility of 2,4,6-trichlorophenol and malonic acid as metabolic uncoupler for 
      sludge reduction in the sequence batch reactor for treating organic wastewater.
PG  - 101-9
AB  - The activated sludge process generates a large amount of excess sludge as a 
      byproduct, which is one of the most serious challenges in biological wastewater 
      treatment. In the present study, the feasibility of 2,4,6-trichlorophenol (TCP) 
      and malonic acid (MA) as metabolic uncouplers to reduce sludge generation in the 
      sequence batch reactor (SBR) for treating organic wastewater for a long period 
      was studied. The results showed that 2 mg/L TCP could reduce sludge generation by 
      about 47%, while chemical oxygen demand (COD) removal efficiency and sludge 
      settlability were not obviously influenced. Although 10 mg/L MA could also reduce 
      excess sludge production by about 30% while slightly affecting COD removal, it 
      seriously deteriorated sludge settlability. Accordingly, TCP is a better 
      uncoupler for sludge reduction for a longer period in the SBR for treating 
      organic wastewater, and MA can only be used as a short-term or transitional 
      uncoupler. Microscopic and 16S ribosomal deoxyribonucleic acid analyses showed 
      that the microbial population of sludge varied when uncouplers were fed to the 
      activated sludge system. Occurrence of large amounts of filament and the 
      disappearance of protozoa may be the main reason for the aggravation of sludge 
      settlability under uncoupled metabolic conditions caused by MA.
FAU - Zheng, G H
AU  - Zheng GH
AD  - School of Environmental Science and Engineering, State Key Laboratory of 
      Pollution Control and Resource Reuse, Tongji University, Shanghai 200092, China.
FAU - Li, M N
AU  - Li MN
FAU - Wang, L
AU  - Wang L
FAU - Chen, Z Y
AU  - Chen ZY
FAU - Qian, Y F
AU  - Qian YF
FAU - Zhou, Q
AU  - Zhou Q
LA  - eng
PT  - Journal Article
PT  - Research Support, Non-U.S. Gov't
PL  - United States
TA  - Appl Biochem Biotechnol
JT  - Applied biochemistry and biotechnology
JID - 8208561
RN  - 0 (Chlorophenols)
RN  - 0 (Environmental Pollutants)
RN  - 0 (Malonates)
RN  - 0 (Organic Chemicals)
RN  - 0 (Sewage)
RN  - 0 (Uncoupling Agents)
RN  - 9007-49-2 (DNA)
RN  - 9KX7ZMG0MK (malonic acid)
RN  - MHS8C5BAUZ (2,4,6-trichlorophenol)
SB  - IM
MH  - *Bioreactors
MH  - Chlorophenols/chemistry/*pharmacology
MH  - DNA/analysis
MH  - Electrophoresis, Polyacrylamide Gel
MH  - Environmental Pollutants/chemistry/metabolism
MH  - Feasibility Studies
MH  - Malonates/chemistry/*pharmacology
MH  - Microbial Viability/drug effects
MH  - Organic Chemicals/chemistry/*metabolism
MH  - Sewage/chemistry/*microbiology
MH  - Uncoupling Agents/chemistry/*pharmacology
MH  - Water Purification/*methods
EDAT- 2008/05/06 09:00
MHDA- 2008/06/06 09:00
CRDT- 2008/05/06 09:00
PHST- 2008/05/06 09:00 [pubmed]
PHST- 2008/06/06 09:00 [medline]
PHST- 2008/05/06 09:00 [entrez]
AID - 10.1007/s12010-007-8101-3 [doi]
PST - ppublish
SO  - Appl Biochem Biotechnol. 2008 Feb;144(2):101-9. doi: 10.1007/s12010-007-8101-3.