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Effect of Hydraulic Retention Time on the Treatment of Real Cattle Slaughterhouse Wastewater and Biogas Production from HUASB Reactor

1
Department of Civil Engineering, Faculty of Engineering, Universiti Putra Malaysia, Serdang, Selangor 43400, Malaysia
2
Department of Civil and Water Resources Engineering, University of Maiduguri, P.M.B., Maiduguri 1069, Borno State, Nigeria
*
Author to whom correspondence should be addressed.
Water 2020, 12(2), 490; https://doi.org/10.3390/w12020490
Received: 3 October 2019 / Revised: 11 November 2019 / Accepted: 18 November 2019 / Published: 11 February 2020
(This article belongs to the Section Wastewater Treatment and Reuse)
Anaerobic digestion technology provides an alternative route for sustainable management of organic waste. In this study, the performance of the hybrid upflow anaerobic sludge blanket (HUASB) reactor consisting of synthetic grass media as attached growth surface was investigated for the treatment of cattle slaughterhouse wastewater under mesophilic (35 ± 1 °C) condition. After acclimatization with synthetic wastewater, the reactor was loaded up to OLR 10 g L−1d−1, corresponding to 20 g COD/L at a varying hydraulic retention time (HRT) of 24, 30, 36, 42, and 48 h. The system attained a maximum COD removal efficiency of 97% total suspended solids (TSS), volatile suspended solids (VSS), fats, oil, and grease (FOG), color removal, and turbidity were found as 97%, 284 mg/L, 79%, 78%, and 91% respectively. The biogas production after 48 h was found as 38 L/d, with about 85% methane and specific methane production of 0.24 LCH4/gCODadded. The ratio of alkalinity was 0.22, while ammonia nitrogen concentration reached a maximum of 839 mg/L at a steady state. Scanning electron microscopic (SEM) analysis revealed a predominance of Methanosarcina bacteria with the coccoidal shape at the end of the performance study. Therefore, the results of the experiment showed that increasing HRT significantly affects the performance of the system. View Full-Text
Keywords: acclimatization of seed sludge; biogas production; HRT; OLR; COD removal; TSS removal acclimatization of seed sludge; biogas production; HRT; OLR; COD removal; TSS removal
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Musa, M.A.; Idrus, S. Effect of Hydraulic Retention Time on the Treatment of Real Cattle Slaughterhouse Wastewater and Biogas Production from HUASB Reactor. Water 2020, 12, 490.

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