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Environ Technol. 2015 Nov 21:1-24. [Epub ahead of print]

Development of a BR-UASB-DHS system for natural rubber processing wastewater treatment.

Author information

1
a Department of Environmental Systems Engineering , Nagaoka University of Technology , 1603-1 Kamitomioka, Nagaoka, Niigata , Japan , 940-2188, Tel: +81 258 47 9612.
2
b Department of Biotechnology , Hanoi University of Science and Technology , No.1, Dai Co Viet, Hai Ba Trung district, Hanoi , Vietnam , Tel: +84 4 38682453.
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c Department of Civil and Environmental Engineering , National Institute of Technology , Kure College, 1-2-11. Aga- minami, Kure , Japan , 737-8506, Tel; +81 823 73 8955.
4
d Department of Chemical Engineering , Hanoi University of Science and Technology , No.1, Dai Co Viet, Hai Ba Trung district, Hanoi , Vietnam, Tel.: + 84 4 38684376, E-mail: nguyen.minhtan@gmail.com.
5
e School for Environmental Science and Technology , Hanoi University of Science and Technology , No.1, Dai Co Viet, Hai Ba Trung district, Hanoi , Vietnam, Tel.: +84 4 38681686, E-mail: hai.huynhtrung@hust.edu.vn.
6
f Center for Regional Environmental Research , National Institute for Environmental Studies , 6-2, Onogawa, Tsukuba , Japan 305-8506, Tel.: + 81 29 850 2058, E-mail: stubo@nies.go.jp.
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g Department of Bioengineering , Nagaoka University of Technology , 1603-1 Kamitomioka, Nagaoka, Niigata , 940-2188, Tel.: +81 258 47 9405, E-mail: masao@vos.nagaokaut.ac.jp.

Abstract

Natural rubber processing wastewater contains high concentrations of organic compounds, nitrogen, and other contaminants. In this study, a treatment system composed of a baffled reactor (BR), an upflow anaerobic sludge blanket (UASB) reactor, and a downflow hanging sponge (DHS) reactor was used to treat natural rubber processing wastewater in Vietnam. The BR showed good total suspended solids removal of 47.6%, as well as acidification of wastewater. The UASB reactor achieved a high chemical oxygen demand (COD) removal efficiency of 92.7% ± 2.3% and energy recovery in the form of methane with an organic loading rate of 12.2 ± 6.6 kg-COD·m-3·day-1. The DHS reactor showed a high performance in residual organic matter removal from UASB effluent. In total, the system achieved high-level total COD removal of 98.6% ± 1.2% and total suspended solids removal of 98.0% ± 1.4%. Massive parallel 16S rRNA gene sequencing of the retained sludge in the UASB reactor showed the predominant microbial phyla to be Bacteroidetes, Firmicutes, Proteobacteria, WWE1, and Euryarchaeota. Uncultured bacteria belonging to the phylum Bacteroidetes and Phylum WWE1 were predominant in the UASB reactor. This microbial assemblage utilizes the organic compounds contained in natural rubber processing wastewater. In addition, the methane-producing archaea Methanosaeta sp. and Methanolinea sp. were detected.

KEYWORDS:

baffled reactor; downflow hanging sponge; microbial community analysis; natural rubber; upflow anaerobic sludge blanket

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