Microbial community composition of a down-flow hanging sponge (DHS) reactor combined with an up-flow anaerobic sludge blanket (UASB) reactor for the treatment of municipal sewage.
The microbial community composition of a down-flow hanging sponge (DHS) reactor in an up-flow anaerobic sludge blanket (UASB)-DHS system used for the treatment of municipal sewage was investigated. The clone libraries showed marked differences in microbial community composition at different reactor heights and in different seasons. The dominant phylotypes residing in the upper part of the reactor were likely responsible for removing organic matters because a significant reduction in organic matter in the upper part was observed. Quantification of the amoA genes revealed that the proportions of ammonia oxidizing bacteria (AOB) varied along the vertical length of the reactor, with more AOB colonizing the middle and lower parts of the reactor than the top of the reactor. The findings indicated that sewage treatment was achieved by a separation of microbial habitats responsible for organic matter removal and nitrification in the DHS reactor.
Department of Civil and Environmental Engineering, Tohoku University, 6-6-06 Aoba, Aramaki, Aoba-ku, Sendai, Miyagi 980-8579, Japan. Electronic address: kengok@epl1.civil.tohoku.ac.jp.
Kengo
K
Kubota
Mikio
M
Hayashi
Kengo
K
Matsunaga
Akinori
A
Iguchi
Akiyoshi
A
Ohashi
Yu-You
YY
Li
Takashi
T
Yamaguchi
Hideki
H
Harada
D000641:Ammonia / Q000378:metabolism; D000693:Anaerobiosis; D001105:Archaea; D001419:Bacteria / Q000254:growth & development*; D001673:Biodegradation, Environmental; D019149:Bioreactors / Q000382:microbiology*; D002947:Cities; D015723:Gene Library; D005798:Genes, Bacterial; D008969:Molecular Sequence Data; D058458:Nitrogen Cycle; D009930:Organic Chemicals / Q000302:isolation & purification; D010084:Oxidation-Reduction; D010802:Phylogeny; D012336:RNA, Ribosomal, 16S / Q000235:genetics; D012722:Sewage / Q000382:microbiology*; D014865:Waste Disposal, Fluid / Q000295:instrumentation*
D009930:Organic Chemicals; D012336:RNA, Ribosomal, 16S; D012722:Sewage; D000641:Ammonia
Ammonia oxidation; Down-flow hanging sponge (DHS); Microbial community composition; Sewage treatment