Bioresource Technology 249 (2018) 851–857 Contents lists available at ScienceDirect Bioresource Technology journal homepage: www.elsevier.com/locate/biortech Enhanced granulation and methane recovery at low load by downﬂow sludge circulation in anaerobic treatment of domestic wastewater Yangyang Liu, Lihui Huang , Guihua Dong, Gaofeng Liu, Xueyuan Wu, Chuang Wang, Xiaowei Liu, Lisha Wang School of Environmental Science and Engineering, Shandong University, Jinan 250100, China GR APHICAL A BSTRACT ARTICLE I NFO ABSTRACT Keywords: The eﬀects of downﬂow sludge circulation on granulation and methane recovery at low load were investigated Downﬂow sludge circulation for domestic wastewater treatment in a modiﬁed anaerobic reactor. Compared with conventional upﬂow Granulation anaerobic reactors, enhanced granulation with shortened start-up time was achieved and stable granules were Mass transfer successfully cultivated only after 58 days operations. The introduction of downﬂow sludge circulation resulted in Methane recovery reverse wastewater-sludge ﬂow and uniform sludge distribution in the reaction zone, which contributed to Microbial community enhanced wastewater-sludge mass transfer and satisfactory performance with a high soluble chemical oxygen demand (SCOD) removal eﬃciency of 94.8% at hydraulic retention time (HRT) 6 h. Besides, enhanced liquid-to- gas mass transfer caused a lower dissolved CH saturation index of 1.11 and a higher CH recovery eﬃciency
Bioresource Technology – Elsevier
Published: Feb 1, 2018
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