tailieunhanh - Anaerobic digestion of sludge in wastewater treatment plant for energy recovery – A case study of HaNoi urban district

As a conventional treatment process, centrifugal dewatering of sludge required an additional energy of 1,376 kWh per day for recycling, pumping, mixing as well as transporting sludge. The conclusion was that anaerobic digestion can reduce the green-house gases versus conventional dewatering. The results from this research can thus demonstrate the applicability of anaerobic digestion on conversion of waste to energy, looking forward to resource recovery. | Journal of Science and Technology 54 (2A) (2016) 21-26 ANAEROBIC DIGESTION OF SLUDGE IN WASTEWATER TREATMENT PLANT FOR ENERGY RECOVERY – A CASE STUDY OF HANOI URBAN DISTRICT Thi Thuy Bui1, Viet Anh Nguyen2, * 1 Environmental Engineering Division, Faculty of Environment, Water Resources University, 2 Institute of Environmental and Science Engineering, Hanoi University of Civil Engineering * Email: vietanhctn@ Received: April 30th 2016; Accepted for Publication: June 15th, 2016 ABSTRACTS In a wastewater treatment plant (WWTP) energy optimization is a big concern whilst sludge stabilization and energy recovery by anaerobic digestion implementation has recently gained importance. The calculation of an urban district level (selected as Long Bien) with 352,000 populations showed that with a total energy required of 39,750 kWh per day in WWTP, it could be supplied by utilization of biogas production, varying from 0% to ~ % depending upon the non-application or application of anaerobic digestion for sludge treatment. In mesophylic anaerobic digestion, the biogas yields production of the calculated WWTP was obtained at 3,710 m3/day; equal to 8,394 kWh power and 13,919 kWh heat per day. As a conventional treatment process, centrifugal dewatering of sludge required an additional energy of 1,376 kWh per day for recycling, pumping, mixing as well as transporting sludge. The conclusion was that anaerobic digestion can reduce the green-house gases versus conventional dewatering. The results from this research can thus demonstrate the applicability of anaerobic digestion on conversion of waste to energy, looking forward to resource recovery. Keywords: Anaerobic digestion; biogas; energy; sewerage sludge treatment; resource recovery. 1. INTRODUCTION Energy consumption in a wastewater treatment plants is depended upon various factors (. the size, design and operation of the plant; the characteristics of wastewater; and other local aspects); but it is .