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>Effect of ethylene glycol-bis(β-aminoethyl ether)-N,N-tetraacetic acid (EGTA) on stability and activity of methanogenic granular sludge
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Effect of ethylene glycol-bis(β-aminoethyl ether)-N,N-tetraacetic acid (EGTA) on stability and activity of methanogenic granular sludge
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机译：Effect of ethylene glycol-bis(β-aminoethyl ether)-N,N-tetraacetic acid (EGTA) on stability and activity of methanogenic granular sludge
The effect of the calcium-specific chelant ethylene glycol-bis(-aminoethyl ether)-N,N-tetraacetic acid (EGTA) on methanogenic granular sludge from a laboratory-scale upflow anaerobic sludge-blanket (UASB) reactor fed propionate and from a full-scale reactor treating paper-mill waste-water was studied. Upon treatment with EGTA both sludge types showed a decrease in the calcium and phosphorus content and a release of protein and polysaccharides, leading to a decrease in strength of papermill granular sludge and a disintegration of propionate-grown granules. After treatment of propionate-grown granular sludge with high EGTA concentrations, the methanogenic activity with propionate and acetate as test substrates decreased by 88 and 33, respectively. The marked reduction in propionate oxidation activity may be caused by a disruption of the special juxtapositioning of bacteria in the granules.
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