| 摘要 |
PURPOSE:To provide a titled extractant which diminishes remaining sludge in a sludge treatment by microorganisms and improves the dehydration property of anaerobic sludge and consists of citric acid, H2O2, water in a specified ratio. CONSTITUTION:A solution consisting of, by weight, 0.5-65% citric acid, 0.01- 20% H2O2 and the balance water is added to a mixture consisting of 0.05-10% Al, 1-25% zeolite, 0.1-5% zeolite powder, 0.01-1% glycol, 0.01-0.1% copper sulfate to produce a 100% composition. By heating the composition, an extractant consisting of citric acid and zeolite substituted by Al in which active ions are extracted is obtd. The sludge remaining after cleaning treatment of sewage by microorganisms is further activated and cleaning actions such as deodoration, diminishing of org. matters, adsorption of inorg. matters or the like are carried out to diminish the remaining sludge. The above-mentioned aqueous solution is used only in the cases of diminishing the viscosity of the anaerobic sludge at the first stage and of improving the separation of water in a precipitation tank by increasing separation and dehydration properties and improving the dehydration action.
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