Pursuing Simple and Low-cost Operation for Sludge Reduction via a Self-Oxidized Reduction Process in a Field-Scale Sewage Treatment Plant
Ryoko Sekifuji
School of Environmental Engineering, Toyama Prefectural University, 5180 Kurokawa, Imizu, Toyama 939-0398, Japan.
Satoru Takinami
Shouei Consul Co., Ltd., 4948-1 Kurokawa-Shin, Imizu, Toyama 939-0311, Japan.
Yukinori Harada
Shouei Consul Co., Ltd., 4948-1 Kurokawa-Shin, Imizu, Toyama 939-0311, Japan.
Masashi Watanabe
Shouei Consul Co., Ltd., 4948-1 Kurokawa-Shin, Imizu, Toyama 939-0311, Japan.
Masafumi Tateda *
School of Environmental Engineering, Toyama Prefectural University, 5180 Kurokawa, Imizu, Toyama 939-0398, Japan.
*Author to whom correspondence should be addressed.
Abstract
Aims: A self-oxidized sludge reduction process was installed in a municipal sewage treatment plant at full scale in order to verify the efficiency of the process.
Study Design: A full-scale (100 m3) self-oxidized sludge reduction tank was constructed in a municipal sewage treatment plant and was operated for collecting data.
Place and Duration of Study: The sewage treatment plant was located in a city of Toyama Prefecture, Japan. The field test was conducted from FY 2011 to 2015.
Methodology: By observing BOD, SS, and CODMN and controlling them to conform to industrial wastewater discharge standards, the cost reduction of waste sludge disposal resulting from sludge mass reduction via the self-oxidized process was evaluated.
Results: In this study, the operation cost for a local small government in charge of the plant was reduced by more than 50,000 USD per year.
Conclusions: The self-oxidized method can be an alternative sludge reduction method.
Keywords: Sewage treatment, sludge reduction, self-oxidized process, MLSS, WSSS.