Performance evaluation of a down-flow hanging sponge (DHS) reactor as a decentralized domestic wastewater treatment system in tropical regions.

Autor: Danshita T; Center for Regional Environmental Research, National Institute for Environmental Studies, Tsukuba, Ibaraki, Japan.; Faculty of Engineering, Department of Environmental Engineering, Kasetsart University, Bangkok, Thailand., Yoochatchaval W; Department of Civil Engineering and Architecture, National Institute of Technology, Tokuyama College, Shuunan, Yamaguchi, Japan., Takemura Y; Center for Regional Environmental Research, National Institute for Environmental Studies, Tsukuba, Ibaraki, Japan., Miyaoka Y; Department of Civil and Environmental Engineering, Nagaoka University of Technology, Nagaoka, Niigata, Japan., Kada M; Department of Civil and Environmental Engineering, Nagaoka University of Technology, Nagaoka, Niigata, Japan., Tepjun W; Department of Civil Engineering and Architecture, National Institute of Technology, Tokuyama College, Shuunan, Yamaguchi, Japan., Thonglee S; Department of Civil Engineering and Architecture, National Institute of Technology, Tokuyama College, Shuunan, Yamaguchi, Japan., Sonaka H; Department of Civil and Environmental Engineering, Nagaoka University of Technology, Nagaoka, Niigata, Japan., Yamaguchi T; Department of Science and Technology Innovation, Nagaoka University of Technology, Nagaoka, Niigata, Japan., Tomioka N; Center for Regional Environmental Research, National Institute for Environmental Studies, Tsukuba, Ibaraki, Japan., Banjongproo P; Department of Drainage and Sewerage, Bangkok Metropolitan Administration, Dindang, Bangkok, Thailand., Okadera T; Center for Regional Environmental Research, National Institute for Environmental Studies, Tsukuba, Ibaraki, Japan., Ebie Y; Center for Material Cycles and Waste Management Research, National Institute for Environmental Studies, Tsukuba, Ibaraki, Japan., Syutsubo K; Center for Regional Environmental Research, National Institute for Environmental Studies, Tsukuba, Ibaraki, Japan.
Jazyk: angličtina
Zdroj: Journal of environmental science and health. Part A, Toxic/hazardous substances & environmental engineering [J Environ Sci Health A Tox Hazard Subst Environ Eng] 2020; Vol. 55 (7), pp. 847-857. Date of Electronic Publication: 2020 Apr 07.
DOI: 10.1080/10934529.2020.1748472
Abstrakt: In this study, a pilot-scale down-flow hanging sponge (DHS) reactor was operated in the community plant of Bangkok for the treatment of domestic wastewater (COD 285 mg/L, BOD 105 mg/L) collected by separate sewer to evaluate the reactor's feasibility as a decentralized treatment system. The DHS reactor was operated for 600 days at ambient temperatures of 25-30 °C, both with constant flow conditions and with fluctuating flow conditions that simulated wastewater discharge patterns of the community. The results indicate that under constant flow at an HRT of 5 h, the volumetric loading rates of 0.36 kgBOD/m 3 -sponge/day and 0.16 kgN/m 3 -sponge/day were the optimum operational conditions of the DHS reactor in order to satisfy the effluent discharge standards. The DHS achieved removal rates of 89, 95, 91 and 90% for COD, BOD, TSS and NH 4 -N. Under the fluctuating flow condition, improvement of denitrification was confirmed at volumetric loading rates of 0.50 kgBOD/m 3 -sponge/day and 0.18 kgN/m 3 -sponge/day. The fluctuating flow of wastewater positively affects retained sludge activities in terms of homogenizing sludge concentration and stimulating oxygen uptake rates. These results suggest that the DHS reactor can be applied as a decentralized treatment system for domestic wastewater with fluctuating flow rates in tropical regions.
Databáze: MEDLINE
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