厌氧过滤和厌氧混合的两步法处理低温生活污水 英文版.pdfVIP

Water Research 36 (2002) 2225–2232 Treatment of domestic sewage in a two-step anaerobic filter/anaerobic hybrid system at low temperature 1 2 Tarek A. Elmitwalli , Kim L.T. Oahn , Grietje Zeeman*, Gatze Lettinga Sub-Department of Environmental Technology, Wageningen University, P.O. Box 8129, 6700 EV Wageningen, Netherlands Received 24 August 2000; received in revised form 20 September 2001; accepted 26 September 2001 Abstract The treatment of domestic sewage at low temperature of 131C was investigated in a two-step system consisting of an anaerobic filter (AF) +an anaerobic hybrid (AH) reactor operated at different hydraulic retention times (HRTs). The AF reactor was efficient in the removal of suspended COD, viz. 81%, 58% and 57% at an HRT of, respectively, 4, 2 and 3 h. For optimisation of the removal of suspended COD and dissolved COD, an HRT of 4+4 h is required for the AF+AH system. For additional optimisation of colloidal COD removal, the AH reactor needs an HRT of 8 h. The AF+AH system operated at an HRT of 4+8 h at 131C provided a high removal efficiency for all COD fractions. The achieved total COD removal was as high as 71% which is similar to values found in tropical areas. Moreover, 60% of the removed COD was converted to methane. r 2002 Elsevier Science Ltd. All rights reserved. Keywords: Wastewater treatment; Domestic sewage; Anaerobic digestion; Anaerobic filter; Anaerobic hybrid; Polyurethane foam; Two step system 1. Introduction longer hydraulic retention time (HRT) is needed due to the lower rate of hydrolysis [1] and the higher