Abstract
The possibility of reed chip as a carrier material for the thermophilic oxic process was examined by comparing with the cedar chip. The water holding capacity of reed chip (2-3mm) was about 34% less than cedar chip, but the ventilation was about 17% higher than cedar chip. As a result, 6% decrease in water holding capacity and 12% increase in ventilation were realized when reed and cedar chip were mixed equally compared with single use of cedar chip. By using mixed chip of reed and cedar, the average temperature during treatment by the thermophilic oxic process was 10°C higher, resulting in 7% improvement in treatment efficiency and 50% less residual accumulation than those with cedar chip. These results demonstrated an enough possibility of mixed chip of reed and cedar enabling higher treatment performance in the thermophilic oxic process than conventional system.
