ISSN: 1659-2751



Evaluation of an Anaerobic Treatment of Domestic Wastewater at EARTH University for Energy Production


An evaluation was made of a continuous flow (CF) anaerobic digester fed with human feces and urine and fed to an anaerobic colapsable plastic bag (batch) with septic waste from EARTH University’s dormitories septic tank. The volume of biogas produced failed to be measured with complete accuracy, for this reason an estechiometric estimation was undertaken which yielded an estimated 20.9 L/m3 per day (CF) and 26.7 L/m3 per day (batch), equivalent to 0.21 kWh/m3 per day and 0.27 kWh/m3 per day, respectively. Both had a 63 % of methane gas (CH4) concentration and reported values of 11.3 mg/L ± 6.2 (6) mg/L and 318.8 mg/L ± 3.4 (6) mg/L of hydrogen sulfide (H2S) in the CF and the batch digester, respectively. The results of water quality show that some parameters taken do not comply with the permissible limits of the Costa Rican environmental legislation.

Key words: wastewater, biodigesters, biogas, human manure, septic waste, methane.

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