Energy Return on Investment for Algal Biofuel Production Coupled with Wastewater Treatment
Abstract:This study presents a second-order energy return on investment analysis to evaluate the mutual benefits of combining an advanced wastewater treatment plant (WWTP) (with biological nutrient removal) with algal biofuel production. With conventional, independently operated systems, algae production requires significant material inputs, which require energy directly and indirectly, and the WWTP requires significant energy inputs for treatment of the waste streams. The second-order energy return on investment values for independent operation of the WWTP and the algal biofuels production facility were determined to be 0.37 and 0.42, respectively. By combining the two, energy inputs can be reduced significantly. Consequently, the integrated system can outperform the isolated system, yielding a second-order energy return on investment of 1.44. Combining these systems transforms two energy sinks to a collective (second-order) energy source. However, these results do not include capital, labor, and other required expenses, suggesting that profitable deployment will be challenging.
Document Type: Research Article
Affiliations: 1: The Center for Electromechanics, University of Texas at Austin, Austin, 1 University Station R7000, Austin, TX 78712 2: Department of Civil, Architectural, and Environmental Engineering, University of Texas at Austin 3: Center for International Energy and Environmental Policy, University of Texas at Austin 4: Department of Mechanical Engineering, University of Texas at Austin 5: Austin Water Utility, Environmental and Regulatory Services Division, City of Austin, Austin, Texas
Publication date: September 1, 2012
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