MASS BALANCE AND ENERGY ANALYSIS OF A WASTEWATER SLUDGE ANAEROBIC DIGESTION SYSTEM FOR ENERGY RECOVERY
Abstract
In wastewater treatment plant (WWTP), energy optimization is a big concern whilst sludge stabilization and energy recovery by anaerobic digestion implementation have recently gained importance. The mass balance and energy balance calculations in a case study of the urban district of Long Bien, Hanoi city with 352,000 populations showed that from 0 to 42.1% of total energy of 39,750kWh per day required for WWTP operation could be supplied from biogas production depending on application of anaerobic digestion process for sewage sludge treatment. The mesophylic anaerobic digestion at the studied WWTP with a capacity of 75,000m3/day could generate 3,710m3/day of biogas, equal to 8,394kWh of power and 13,919kWh of heat per day. In the other scenario, a conventional treatment process with centrifugal dewatering and dumping of sludge at landfill required 1,309kWh of energy per day for sludge treatment and disposal while total energy requirement for the WWTP was 41,051kWh/day. The results from this case study demonstrated the potential application of anaerobic digestion for sewage sludge treatment and energy recovery which could bring more benefits than conventional sewage sludge treatment options.
Keywords: Anaerobic digestion; biogas; energy; resource recovery sewerage sludge treatment.
Received: September 8th, 2016, revised: September 22th, 2016, accepted: October 13th, 2016
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