Kazuyoshi Matsunaga*, Keijirou Morita*, Motoichi Kondoh*, Tsutomu Itatani*, Tadashige Mori*, Kouji Shishido** and Motohiro Ohbu**

*Okayama Prefectural Institute for Environmental Science and Public Health
**Kawatetsu Transpotation & Technology Co., Ltd.

+ Correspondence should be addressed to Kazuyoshi Matsunaga:
Okayama Prefectural Institute for Environmental Science and Public Health
(739-1 Uchio, Okayama 701-02 Japan)

Abstract

In Japan, the yearly production of sewage sludge amounted to 1.50million tons in 1992 and about eighty percent of the sludge produced has been treated by landfill disposal. Studies of effective utilization and recovery of sewage sludge have become important and urgent problems as a necessary consequence of limited landfill sites. We developed the new production method for high adsorptive activated charcoal from organic sludge containing sewage and food industrial waste water treatment, etc.

The dried sludge was carbonized for 2hours at 650*C[Celsius degeree] under wrapping vessels with aluminium foil without nitrogen gas flow. The carbonized substances were heated for 10 min. at 650*C[Celsius degeree] with potasium hydroxide flake and washed with hot water. The activated ones were treated for 30min. at 100*C[Celsius degeree] with 35% hydrochloric acid and then the high adsorptive activated charcoal was produced. The characteristic values of this activated charcoal were as follows: methylene blue number was 160-250ml/g; specific surface area was 793-1,771m2/g. The developed charcoal can be utilized for the advanced waste water treatment and/or environmental purification such as deodorization and decolorization.

Key words: organic sludge, production method of the high adsorptive activated charcoal, KOH/HCl treatment, methylene blue number, advanced waste water treatment