Efficiency of high rate treatment of low-strength municipality sewage by a pilot-scale combination system of a sedimentation tank and a down-flow hanging sponge reactor
| Autor: | Thotsaphon Wong-asa, Krit Choeisai, Masashi Hatamoto, Takashi Yamaguchi, Watcharapol Khotwieng, Piyanuch Panchaban, Takahiro Watari, Pairaya Choeisai, Yoshihiro Kirishima |
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| Rok vydání: | 2021 |
| Předmět: |
Nitrogen
Sedimentation (water treatment) Trickling filter 0208 environmental biotechnology Flow (psychology) Sewage 02 engineering and technology 010501 environmental sciences Waste Disposal Fluid 01 natural sciences Bioreactors Environmental Chemistry Combination system Waste Management and Disposal 0105 earth and related environmental sciences Water Science and Technology Biological Oxygen Demand Analysis High rate biology business.industry Environmental engineering General Medicine Thailand biology.organism_classification Nitrification 020801 environmental engineering Sponge Environmental science Sewage treatment business |
| DOI: | 10.6084/m9.figshare.13851148.v2 |
| Popis: | Down-flow hanging sponge (DHS) reactor that is sponge-based trickling filter was considered to be an alternative aerobic treatment system for low strength sewage treatment under tropical conditions. This study aims to determine the process performance of the DHS reactor combined with a pre-treatment sedimentation tank (SED) system installed at the municipality sewage treatment plant in Khon Kaen, Thailand over, 1,600 days. The DHS reactor was operated with three operational periods: low (0.2 kgBODm3 per day), high (0.5–1.3 kgBODm3 per day), and super rates (1.7–2.2. kgBODm3 per day). The results showed effective reductions in biochemical oxygen demand (BOD) and suspended solids by more than 74% and 78%, respectively, during the entire experimental period. Moreover, the final effluent met the Thailand discharge standard with an external short hydraulic retention time of 0.2 h. In addition, the combined system facilitates simultaneous nitrification and denitrification and effectively removed up to 43% of total nitrogen. The self-degradation of the organic compounds occurs owing to the retained sludge in the DHS reactor; this leads to undisputed clogging in sponge media. Therefore, the combined SED-DHS system could be an appropriate sewage treatment system for tropical conditions. |
| Databáze: | OpenAIRE |
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