Munetaka Ishikawa

Antimony survey in yodo river basin, Japan in 1994–1995

Antimony survey in Yodo river basin, Japan was conducted in 1994 and 1995. The concentration ranged from 0.3 μg/L to 4 μg/L in average. Background level of 0.3 μg/L were detected in Kizu river and Lake Biwa. On the other hand severe anthropogenic contamination in the lower reaches of Katsura river was observed, where 3 ∼ 4 μg/L were detected in 1994. However, the contamination was presumably improved, as the concentration there decreased in 1995. Antimony load in 1995 was reduced by ca.30% compared to 1994.

Carbon Sink Evaluation for Biochar Production Process

We have proposed consideration of Carbon sink and CO2 emissions derived from electric power and fuel energy, the following A and B facilities were to be an objection.The scenario was prepared in order to get four kind by two cutting method and two carbonizing method were combined. Energy consumption of each scenario were calculated for its machinery specification of A and B company. This study revealed the following results.

A Study on Decrease in Excess Sludge of the Activated Sludge Process by the Addition of Humus or the Extract of Field Horsetail

現在, 汚泥処分法として利用されている埋立地の確保は困難になってきている.そのため生成汚泥低減化技術の開発が課題になっている.そこで本研究では腐植土を添加剤として用い生成汚泥量削減効果を, 累積汚泥量と動力学パラメータの2つの面から検討を行った.また, スギナエキスにおいても同様に検討した.実験結果から以下のような知見が得られた.(1) 累積汚泥量において1日あたりの生成汚泥量を求めると腐植土添加槽で1.45g, 無添加槽で1.74gとなった.(2) 動力学パラメータから腐植土を添加することで無添加槽と比較すると40%生成汚泥量が削減された.(3) スギナエキスを添加剤として用いた場合も腐食土使用時と同等の生成汚泥量削減効果が見られた.