Full-scale application of a down-flow hanging sponge reactor combined with a primary sedimentation basin for domestic sewage treatment
2022
Okubo, Tsutomu | Tagawa, Tadashi | Takahashi, Masayoshi | Iguchi, Akinori | Oshiki, Mamoru | Araki, Nobuo | Kubota, Kengo | Tawfik, Ahmed | Uemura, Shigeki | Harada, Hideki
The down-flow hanging sponge (DHS) reactor is advantageous for sewage treatment since it produces an effluent quality that complies with the standards for reuse and there is little excess sludge. A full-scale DHS module was efficiently employed for the treatment of domestic sewage (200 m³ day⁻¹) flowing from a primary sedimentation basin (PSB), which was used to reduce the suspended solids loading rate and enhance the oxidation of organics by heterotrophs. The combined PSB-DHS was successfully operated at a total hydraulic retention time of 3.4 h (2.4 h for PSB and 1.0 h for DHS) for the relatively long period of 600 days at sewage temperatures of 10 °C to 32 °C. The PSB-DHS consistently produced an effluent quality with minimum values of chemical oxygen demand, biochemical oxygen demand, and suspended solids of 59 ± 15, 12 ± 3.0, and 15 ± 7 mg L⁻¹, respectively. The proposed system performed exceptionally well at removing organics and particulate matter over a short hydraulic retention time.
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