Enhancing anaerobic digestion for rural wastewater treatment with granular activated carbon (GAC) supplementation

Park, Jeong-Hoon; Park, Jong-Hun; Lee, Sang-hoon; Jung, Sokhee P.; Kim, Sang-Hyoun

Enhancing anaerobic digestion for rural wastewater treatment with granular activated carbon (GAC) supplementation

2020

Park, Jeong-Hoon | Park, Jong-Hun | Lee, Sang-hoon | Jung, Sokhee P. | Kim, Sang-Hyoun

Notwithstanding many efforts to increase the efficiency of anaerobic digestion at low-temperature (winter) conditions, a cost-effective and efficient method is lacking. This study proposes a low-cost method of low-temperature (<35 °C) anaerobic digestion of wastewater, involving supplementation with granular activated carbon (GAC). Supplementation with GAC was found to reduce the lag time by 29.8% (from 15.1 to 10.6 days) and increase the maximum methane production rate by 23.4% (from 6.4 to 7.9 mL/day) at 25 °C. Network analysis demonstrated a strong co-occurrence of Syntrophobacteriales and hydrogenotrophic methanogens (Methanobacteriaceae; WSA2; Methanoregulaceae). GAC supplementation can drastically reduce the time required for organic matter decomposition and methane production, thereby increase the efficiency of wastewater treatment.

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