Combining wastewater treatment and biofuel production is considered the cost-effective way for better waste remediation and lowering the environmental impact for biofuel production. In this study, an innovative integrated system incorporating sludge, scum and centrate treatment and biofuel production was developed. A comprehensive techno-economic analysis was conducted to evaluate the technology and economic feasibility of the integrated system with the consideration of biofuel production, wastewater treatment improvement, tax credits, carbon credit, and coproducts utilization. Benefited from the integrated system that the intermediate byproducts can be used in between the sub-systems, such as the glycerol generated from the scum-to-biodiesel production can be used as an organic carbon for the centrate-to-algae production, the estimated breakeven selling price of the bio-oil ($1.85/gallon) is very close to the 5-year averaged crude oil price. The assessment result showed the payback period and the IRRs of the integrated system are superior in comparison with others.
Bibliographical noteFunding Information:
This work was in part supported by the National Key Research and Development Program of China (2016YFC0801906), The YUEQI young scholar grants plan of China University of Mining and Technology (Beijing), Beijing Education Committee Technology Project of China (SQKM201710016007), The Minnesota Environment and Natural Resources Trust Fund as recommended by the Legislative-Citizen Commission on Minnesota Resources (LCCMR), the University of Minnesota Grand Challenge Program, and the University of Minnesota Center for Biorefining.
© 2017 Elsevier Ltd
- Centrate wastewater