活性汚泥容量の変化とその原因物質 : 乳業廃水の処理に関する研究(第2報)

概要

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Patterns of sludge volume reuction in a mixed liquor obtained from two different sources were investigated. The first sample, obtained from a dairy wastewater treatment plant, showed a constant sludge volume in the pH range of 5.0 to 11.0. The sludge volume decreased, however, when the pH was changed to 3.0 or 12.6. The second sample, obtained from a sewage treatment plant, showed a gradual change in sludge volume with pH, with the largest sludge volume at pH 9.0 and the smallest at pH 3.0. Both samples showed the largest sludge volume reduction when pH was changed from 5.0 to 3.0. And the largest amount of polymers was isolated from the alkaline extracts of both activated sludges by reducing the pH from 5.0 to 3.0 (=pH 3 fraction). It was, however, interesting that while the first sample yielded negligible amounts of polymers with pH shifts other than from 5.0 to 3.0,the second sample showed a gradual reduction in the amount of polymers isolated when pH was gradually increased. The polymers isolated were capable of flocculating such substances as kaolinite, alumina, and baker's yeast. These results suggest a possible correlation between the amount of polymers isolated and the degree of sludge volume reduction and role of the polymers in the flocculation of activated sludges.
社団法人日本生物工学会の論文
1981-03-25