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Vol. 31 No. 10 (2019): Vol 31 Issue 10

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Improving Methane Generation by Co-Digestion of Sewage Sludge and Petrochemical Wastewater: Influence of Heat and Alkali Pretreatment

https://doi.org/10.14233/ajchem.2019.22195
M.N.I. Siddique
School of Ocean Engineering, Universiti Malaysia Terengganu, 21030 Kuala Nerus, Terengganu, Malaysia
B.K. Zaied
Faculty of Engineering Technology, Universiti Malaysia Pahang, 26300 Gambang, Kuantan, Pahang, Malaysia
S. Krishnan
Research Institute of Sustainable Environment, University Technology Malaysia, Johor Bahru 81310, Skudai, Malaysia
M.F. Ahmad
School of Ocean Engineering, Universiti Malaysia Terengganu, 21030 Kuala Nerus, Terengganu, Malaysia

Corresponding Author(s) : M.N.I. Siddique

m.nurul@umt.edu.my

Asian Journal of Chemistry, Vol. 31 No. 10 (2019): Vol 31 Issue 10

Abstract

With the target of amplifying methane generation from sewage sludge (SS), co-digestion with petrochemical wastewater (PWW) was examined. In addition, the use of both 165 °C heat treatment and alkali pretreatment to mixed SS/PWW wastewater was assessed. Batch tests demonstrated that refractory materials were generated from pretreatment for petrochemical wastewater at the 165 °C heat and alkali pretreatments at the 75 or 115 °C and with pH value of 8, 9 or 10 producing enhanced preliminary methane generation percentage and a little effect for generation capacity of methane of the miscellaneous waste (+3–6 %). Anaerobic reactors which were operated more than four months semi-continuously with sewage sludge and petrochemical wastewater mix with the proportion of 85:15, 55:45 and 85:15 pretreated at alkaline environments maintaining the temperature of 75 °C and pH = 8. This pretreatment enhanced the production of methane at semi-continuous anaerobic reactors to + 59 %. Finally, this investigation demonstrated the viability of the co-digestion of sewage sludge with a higher ratio of petrochemical wastewater [45 % volume, 50 % volatile solid (VS) and 74 % COD, comparable with volatile fatty acids of 8 g L–1]. The system produced an exact methane of 363 mL CH4 g–1 VS while only sewage sludge generated 117 mL CH4 g–1 VS.

Keywords

Methane Anaerobic Co-digestion Biochemical methane potential Semi-continuous reactors
Siddique, M., Zaied, B., Krishnan, S., & Ahmad, M. (2019). Improving Methane Generation by Co-Digestion of Sewage Sludge and Petrochemical Wastewater: Influence of Heat and Alkali Pretreatment. Asian Journal of Chemistry, 31(10), 2403–2409. https://doi.org/10.14233/ajchem.2019.22195
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