ニトリロ三酢酸に馴養した活性汚泥の性質

概要

論文の詳細を見る
Activated sludge acclimatized to nitrilotriacetate as both a sole carbon and nitrogen source showed good flocculant growth and settling characteristics at various sludge loads. Even at sludge loads from 0.56 to 1.03 kg COD_<cr>/kg MLSS・day, the sludge had good settling properties.Mucilage obtained by hot water extraction and subsequent ethanol precipitation from the activated sludge consisted of sugars (0.8-1.1%) proteins (0.7-1.0%), DNA (0.6-0.9%), and RNA (0.9-1.2%). This composition did not change significantly with sludge load. Mucilage polysaccharides were hydrolyzed satisfactorily with 0. 05 N H_2SO_4 in the presence of Dowex (H^+ form) at 100℃ for 48 h. Sugar components of the mucilage polysaccharide were rhamnose, fucose, arabinose, xylose, mannose, galactose, glucose, galacturonic acid, and glucuronic acid. The major component was glucose (50-60%). The composition of sugars was different from that of mucilage polysaccharides in the activated sludge obtained from municipal sewage treatment plant.Through the reason for the good flocculant properties of the activated sludge acclimatized to NTA was not clarified, it seems reasonable to assume that the sludge-constituting bacteria are regulated by the sole carbon source, NTA, and remain unaltered even when sludge loads are greatly increased.
公益社団法人日本生物工学会の論文
1984-01-25