A pilot-scale study of a down-flow hanging sponge reactor as a post-treatment for domestic wastewater treatment system at short hydraulic retention times. (December 2022)

• Record Type: Journal Article
• Authors: Takemura, Yasuyuki; Yoochatchaval, Wilasinee; Danshita, Tsuyoshi; Miyaoka, Yuma; Aoki, Masataka; Thao, Tran P.; Tomioka, Noriko; Ebie, Yoshitaka; Syutsubo, Kazuaki
• Is Part Of: Journal of water process engineering. Volume 50(2022)
• Publication Date: 2022-12
• Subjects: Domestic wastewater -- Post-treatment -- DHS reactor -- Escherichia coli -- Arcobacter spp.; Water-supply engineering -- Periodicals; Saline water conversion -- Periodicals; Seawater -- Distillation -- Periodicals; Sanitary engineering -- Periodicals; Sewage -- Purification -- Periodicals; 627
• DOI: 10.1016/j.jwpe.2022.103313
• Languages: English
• ISSNs: 2214-7144

Abstract

Abstract: This study proposes a down-flow hanging sponge (DHS) reactor as a post-treatment process for sewage treatment systems. A pilot-scale DHS reactor was operated over 1000 days under relatively short hydraulic retention times (HRT) of 1–3 h to evaluate its effectiveness as a post-treatment technology. The DHS reactor consistently achieved superior effluent water quality with total suspended solid <10 mg/L, biochemical oxygen demand < 10 mg/L, and ammonium nitrogen < 5 mg/L. The effective removals (> 2-log10 reduction) of Escherichia coli, a fecal contaminant indicator, and Arcobacter spp., a potentially pathogenic bacterial group, were achieved. The treatment performance was compared with the previous operation treating raw domestic wastewater under long HRTs of 4 and 5 h. As a result, the DHS reactor under short HRT conditions showed advantages for biological oxidation and fecal contaminant removal. These results indicate that the DHS reactor could be a compact post-treatment technology. Graphical abstract: Unlabelled Image Highlights: DHS was successfully demonstrated as a post-treatment process of existing WWTP. DHS achieved superior effluent quality in terms of TS, BOD, NH4 -N and E. coli . The retained sludge can adapt to treat wastewater in different conc ranges. Short HRT conditions exhibit efficient BOD and NH4 -N oxidation and E. coli removal.