title: Anaerobic treatment of rice winery wastewater in an upflow filter packed with steel slag under different hydraulic loading conditions.
abstract: Rice-washing drainage (RWD), a strong organic wastewater, was anaerobically treated using an upflow filter filled with blast-furnace slag. The continuous performance of the reactor was examined at varying hydraulic retention times (HRTs). The reactor achieved 91.7% chemical oxygen demand removal (CODr) for a 10-day HRT (0.6 g COD/Ld organic loading rate) and maintained fairly stable performance until the HRT was shortened to 2.2 days (CODr > 84%). Further decreases in HRT caused process deterioration (CODr < 50% and pH < 5.5 for a 0.7-day HRT). The methane production rate increased with decreasing HRT to reach the peak level for a 1.3-day HRT, whereas the yield was significantly greater for 3.4-day or longer HRTs. The substrate removal and methane production kinetics were successfully evaluated, and the generated kinetic models produced good performance predictions. The methanogenic activity of the reactor likely relies on the filter biofilm, with Methanosaeta being the main driver.
authors.affiliation: School of Urban and Environmental Engineering, Ulsan National Institute of Science and Technology (UNIST), 50 UNIST-gil, Eonyang-eup, Ulju-gun, Ulsan 689-798, Republic of Korea.
authors.forename: Yeadam
authors.initials: Y
authors.lastname: Jo
authors.affiliation: School of Urban and Environmental Engineering, Ulsan National Institute of Science and Technology (UNIST), 50 UNIST-gil, Eonyang-eup, Ulju-gun, Ulsan 689-798, Republic of Korea.
authors.forename: Jaai
authors.initials: J
authors.lastname: Kim
authors.affiliation: School of Environmental Science and Engineering, POSTECH, Pohang, Gyungbuk 790-784, Republic of Korea.
authors.forename: Seokhwan
authors.initials: S
authors.lastname: Hwang
authors.affiliation: School of Urban and Environmental Engineering, Ulsan National Institute of Science and Technology (UNIST), 50 UNIST-gil, Eonyang-eup, Ulju-gun, Ulsan 689-798, Republic of Korea. Electronic address: cslee@unist.ac.kr.
authors.forename: Changsoo
authors.initials: C
authors.lastname: Lee
mesh_terms: D000693:Anaerobiosis / Q000502:physiology*; D018441:Biofilms / Q000254:growth & development; D057919:Biological Oxygen Demand Analysis / Q000379:methods; D019149:Bioreactors / Q000382:microbiology; D019605:Euryarchaeota / Q000378:metabolism; D007700:Kinetics; D008697:Methane / Q000378:metabolism; D008962:Models, Theoretical; D012275:Oryza / Q000382:microbiology*; D012722:Sewage / Q000382:microbiology*; D013232:Steel / Q000737:chemistry*; D014865:Waste Disposal, Fluid / Q000379:methods; D062065:Wastewater / Q000382:microbiology*; D014920:Wine / Q000382:microbiology*
chemical_list: D008697:Methane; D012722:Sewage; D013232:Steel; D062065:Wastewater
keywords: Blast furnace slag; Kinetic evaluation; Microbial community structure; Rice-washing drainage; Upflow anaerobic filter