ZHU, LIEPING The United Graduate School of Agricultural Sciences, Tottori University
KOZAKI, YUKI Faculty of Life and Environmental Science, Shimane University
AGARI, YOSHIHIRO Faculty of Life and Environmental Science, Shimane University
YOSIDA, ISAO The United Graduate School of Agricultural Sciences, Tottori University
MORI, TADAHIRO Institute of Green, Land and Water
A laboratory scale study was undertaken to investigate the potential of decomposition of algae sludge by a thermophilic oxic process (TOP) . The characteristics of the thermophilic oxic process are that, a minute amount of excess sludge is formed, and organic materials are efficiently degraded, as well as all water is evaporated by the heat generated by bio-degradation.Feasibility of this study was assessed by determining the decomposition efficiency of added organic material, transference of organic carbon to CO2 and decrease efficiency of chlorophyll-a in media. By using cedar chips as media and waste food oil as an additional energy source, algae sludge could be decomposed by the thermophilic oxic process with the following conditions: total solid (TS) load of 1.5 kg⋅m-3⋅d-1, hydraulic volumetric load of 35l·m-3·d-1, waste food oil addition rate of 15% as added algae sludge and aeration rate of 200l⋅m-3⋅min-1.From above manipulation, more than 98% of chlorophyll-a in added algae sludge was decreased, more than 80% of total organic carbon was transferred into CO2, and due to it, low excess sludge production rate of 0.15 kg/kg-BOD treated has been certified in this process.
thermophilic oxic process
Japanese Society of Water Treatment Biology