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Janesville WWTP Employs Multiple Uses for Digester Gas

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The Janesville WWTP upgraded digester gas utilization to maximize revenue potential from biogas resources by improving gas treatment, increasing electricity generated, recovering waste heat and converting biogas to compressed natural gas (CNG) vehicle fuel. High-strength waste can be accepted to increase gas production in the anaerobic digesters. 4, 65 kW microturbines with integral heat recovery were installed initially. A 200kW microturbine and the CNG treatment and compression system were added in a subsequent project. The City sells electricity to the utility at 0.12/kWh during on-peak hours and 0.07/kWh off peak. The City purchases natural gas at 0.74/therm. The plant's control system prioritizes the best use of gas based on time of day/day of week. The City projects being able to offset all purchased energy costs with revenue from electricity sales and offset natural gas for heating. Finding a reliable source of suitable high-strength waste has proved challenging.
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Document Type: Research Article

Publication date: 2012-01-01

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