Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Activated Sludge Deflocculation in Response to Chlorine Addition: The Potassium Connection
Chlorination is often used to control filamentous bulking in activated sludge systems. Pure culture and mixed‐liquor experiments showed that soluble potassium (K+) concentrations increased by 2.4 mg/L (80%) and 1.5 to 3.6 mg/L (11 to 30%) in the bulk liquid phase of pure and activated sludge cultures that were exposed to chlorine, relative to unchlorinated controls. Effluent turbidity and total suspended solids from settled mixed liquor increased significantly in both short‐term batch and sequencing batch reactor experiments when chlorine mass load increased above 6 milligrams of chlorine per gram mixed liquor volatile suspended solids (mg Cl2/g MLVSS) in a single dose, which correlated with a localized chlorine concentration at the dose point of 10 mg/L as Cl2 or greater. The results support the hypothesis that the glutathione‐gated potassium efflux (GGKE) bacterial stress response may contribute to increased effluent turbidity associated with high doses of mixed‐liquor chlorination. It is suggested that potassium is a useful parameter to monitor at full‐scale facilities when determining chlorine mass doses that should be used to control filaments and minimize increases in effluent turbidity.
Activated Sludge Deflocculation in Response to Chlorine Addition: The Potassium Connection
Chlorination is often used to control filamentous bulking in activated sludge systems. Pure culture and mixed‐liquor experiments showed that soluble potassium (K+) concentrations increased by 2.4 mg/L (80%) and 1.5 to 3.6 mg/L (11 to 30%) in the bulk liquid phase of pure and activated sludge cultures that were exposed to chlorine, relative to unchlorinated controls. Effluent turbidity and total suspended solids from settled mixed liquor increased significantly in both short‐term batch and sequencing batch reactor experiments when chlorine mass load increased above 6 milligrams of chlorine per gram mixed liquor volatile suspended solids (mg Cl2/g MLVSS) in a single dose, which correlated with a localized chlorine concentration at the dose point of 10 mg/L as Cl2 or greater. The results support the hypothesis that the glutathione‐gated potassium efflux (GGKE) bacterial stress response may contribute to increased effluent turbidity associated with high doses of mixed‐liquor chlorination. It is suggested that potassium is a useful parameter to monitor at full‐scale facilities when determining chlorine mass doses that should be used to control filaments and minimize increases in effluent turbidity.
Activated Sludge Deflocculation in Response to Chlorine Addition: The Potassium Connection
Wimmer, Robert F. (Autor:in) / Wimmer, Nancy G. (Autor:in)
Water Environment Research ; 76 ; 213-219
01.05.2004
7 pages
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
| British Library Conference Proceedings | 2004
Clays -- Deflocculation and casting control
| Engineering Index Backfile | 1947
Clays -- Deflocculation and casting control
| Engineering Index Backfile | 1947