Comparison of the co-gasification of sewage sludge and food wastes and cost-benefit analysis of gasification- and incineration-based waste treatment schemes

Abstract

The compositions of food wastes and their co-gasification producer gas were compared with the existing data of sewage sludge. Results showed that food wastes are more favorable than sewage sludge for co-gasification based on residue generation and energy output. Two decentralized gasification-based schemes were proposed to dispose of the sewage sludge and food wastes in Singapore. Monte Carlo simulation-based cost-benefit analysis was conducted to compare the proposed schemes with the existing incineration-based scheme. It was found that the gasification-based schemes are financially superior to the incineration-based scheme based on the data of net present value (NPV), benefit-cost ratio (BCR), and internal rate of return (IRR). Sensitivity analysis was conducted to suggest effective measures to improve the economics of the schemes.

Biomass gasification for syngas and biochar co-production: Energy application and economic evaluation

“…A general form of momentum balance for porous bed, Brinkman-Forchheimer equation, was applied in this work [35,36]. (4) where is the viscous resistance term, , is the inertial resistance term, .…”

“…Among the plethora of renewable energy sources and technologies, thermochemical conversion of biomass is regarded to be one of feasible routes to realize a sustainable future since biomass is a carbon neutral energy source and can reduce our dependence on fossil fuels [2]. Downdraft gasification has been proved as a standout choice for small to medium size throughputs [3,4] due to its higher efficiency as compared to other thermochemical processes such as pyrolysis, direct combustion and liquefaction [5][6][7].…”

Co-gasification of woody biomass and chicken manure: Syngas production, biochar reutilization, and cost-benefit analysis

“…Since gasification is conducted in an oxygen deficient environment as opposed to the oxygen-rich environment in incineration, the formation of the toxic pollutants is effectively restrained [9,12]. Furthermore, the gasification technique is well suitable for a decentralised application [13]. On-site treatment of chicken manure at the farms will benefit in two ways: (1) the environmental concerns (e.g., pathogen transmission and odour spread) during the transport of chicken manure to incineration plants is avoided; (2) the power generation (e.g., electricity converted from syngas) from gasification could be used to satisfy a part of the energy demand of the farms.…”

Effect of Ni/Al2O3-SiO2and Ni/Al2O3-SiO2with K2O Promoter Catalysts on H2, CO and CH4Concentration by CO2Gasification ofRosa MultifloraBiomass

“…The biomass gasification process for syngas (synthesis gas) and hydrogen production seems to be among the most economically affordable processes [15] after supercritical water partial oxidative gasification [16,17]. Thereby, a hydrogen rich gas production from biomass (e.g.…”

“…In this study, we report the catalytic conversion of plant biomass (Rosa multiflora) into bio-gaseous yields (H 2 , CO and CH 4 [15][16][17][18][19][20] kg and investigated at the research laboratory under the Faculty of Production and Power Engineering, Krakow University of Agriculture, Poland. Afterwards, the biomass of Rosa multiflora (further designated as RM) was weighted by using a weight balance and data was recorded.…”