title: Performance of down-flow hanging sponge (DHS) reactor coupled with up-flow anaerobic sludge blanket (UASB) reactor for treatment of onion dehydration wastewater.
abstract: In this study, a promising system consisting of up-flow anaerobic sludge blanket (UASB) reactor followed by down-flow hanging sponge (DHS) reactor was investigated for onion dehydration wastewater treatment. Laboratory experiments were conducted at two different phases, i.e., phase (1) at overall hydraulic retention time (HRT) of 11h (UASB reactor: 6h and DHS reactor: 5h) and phase (2) at overall HRT of 9.4h (UASB reactor: 5.2h and DHS reactor: 4.2h). Long-term operation results of the proposed system showed that its overall TCOD, TBOD, TSS, TKN and NH(4)-N removal efficiencies were 92 ± 5, 95 ± 2, 95 ± 2, 72 ± 6 and 99 ± 1.3%, respectively (phase 1). Corresponding values for the 2nd phase were 85.4 ± 5, 86 ± 3, 87 ± 6, 65 ± 8 and 95 ± 2.8%. Based on the available results, the proposed system could be more viable option for treatment of wastewater generated from onion dehydration industry in regions with tropical or sub-tropical climates and with stringent discharge standards.
authors.affiliation: Water Pollution Research Department, National Research Centre, El-Tahrir St., Dokki, PO Box, Cairo 12311, Egypt.
authors.forename: Hala
authors.initials: H
authors.lastname: El-Kamah
authors.forename: Mohamed
authors.initials: M
authors.lastname: Mahmoud
authors.forename: Ahmed
authors.initials: A
authors.lastname: Tawfik
mesh_terms: D000641:Ammonia / Q000032:analysis; D000693:Anaerobiosis; D001673:Biodegradation, Environmental; D057919:Biological Oxygen Demand Analysis; D019149:Bioreactors / Q000592:standards*; D003681:Dehydration; D009584:Nitrogen / Q000032:analysis / Q000302:isolation & purification; D019697:Onions / Q000737:chemistry*; D009930:Organic Chemicals / Q000302:isolation & purification; D012212:Rheology / Q000295:instrumentation*; D012722:Sewage / Q000737:chemistry*; D013997:Time Factors; D014865:Waste Disposal, Fluid; D018508:Water Purification / Q000295:instrumentation* / Q000379:methods*
chemical_list: D009930:Organic Chemicals; D012722:Sewage; D000641:Ammonia; D009584:Nitrogen