Journal
PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
Volume 95, Issue -, Pages 1-11Publisher
ELSEVIER
DOI: 10.1016/j.psep.2015.01.012
Keywords
Anaerobic digestion; Compost leachate; Hybrid EGSB-FB; ECF process; Response surface methodology (RSM); Wastewater treatment
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In this research, treatability of high-load compost leachate in a hybrid expanded granular sludge bed (EGSB) and fixed-bed (FB) bioreactor followed by electrocoagulation-flotation (ECF) system was examined. The operational factors in EGSB-FB were influent chemical oxygen demand (COD), hydraulic retention time (HRT) and COD/nitrogen ratio (COD/N). And, their interactive effects on the efficiency of COD removal and biogas production rate (BPR) as responses were analyzed and correlated by response surface methodology (RSM). The optimum conditions of the hybrid EGSB-FB reactor were acquired at COD = 7800 mg/L, HRT = 35 h, COD/N=70, in which COD removal efficiency was 83% and BPR 94 mL/h. The amount of confidence interval was 95%. COD (relevant coefficient = 9.8) and HRT (relevant coefficient = -24) were resulted respectively as the most effective parameters on COD removal and BPR. Yet, COD/N parameter imposed negative effect on COD removal and BPR in values less than about 100. The outcomes indicated that operated ECF as post-treatment in constant conditions (electrolysis time=75 min, electrodes distance = 3 cm, voltage=20V) successfully satisfied discharge criteria in the most part of experimental domains. (C) 2015 The Institution of Chemical Engineers. Published by Elsevier B.V. All rights reserved.
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