し尿処理汚泥の有機高分子凝集剤処理における凝集剤の吸着と凝集汚泥の脱水性

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  • Polyelectrolyte adsorption and its effect on dewatering characteristics of night soil treatment sludge.
  • シニョウ ショリ オデイ ノ ユウキ コウブンシ ギョウシュウザイ ショリ ニ

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The effect of adsorption of polyelectrolyte on dewatering characteristics was investigated for night soil treatment sludge.<BR>The results obtained were as follows.<BR>1) Under an apparently saturated condition, the adsorbed weight of polyelectrolyte per unit weight of suspended solid (Xw*) was constant for polyelectrolytes of low-molecular weight, but it came to decrease with increasing molecular weight for those of higher molecular weight.<BR>2) Under the apparently saturated condition, the adsorbed charge of polyelectrolyte per unit weight of suspended solid showed a similar dependency on the molecular weight to Xw*.<BR>3) Dewatering characteristics with high-molecular weight polyelectrolyte was optimum at break point, i.e., a polyelectrolyte dosage above which residual polyelectrolyte was observed in centrifugally separated water. At the break point a large number of sites, to which cationic polyelectrolyte molecules could adsorb, remained on the suspended solid surface.<BR>4) Dewatering by using both a low-molecular weight cationic polyelectrolyte and a high-molecular weight anionic polyelectrolyte in series was optimum at the break point dosages for each polyelectrolyte. The more a sludge which was treated with a cationic polyelectrolyte amount less than the break point dosage had adsorbed cationic charge, the lower the moisture ratio became for the dewatered cake.

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