At the biggest sewage treatment plant of Niersverband methane gas is recovered from surplus digestion gas and injected into low pressure public utility pipeline in compliance with low calorific natural gas quality standards. The necessary surplus gas yield availability is evaluated. The variations of supply to utility and the probability of peak load capacity running time are displayed. Operation expenditures costs and economy are evaluated. Utilization of 1,6 Million m3/a processed biogas is expected.

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