Organic composite flocculant for conditioning and dehydration of sludge

Abstract

The invention discloses an organic composite flocculant for conditioning and dehydration of sludge. An active substance of the organic composite flocculant mainly comprises a cationic organic compound A and a polymeric organic flocculant B in a mass ratio of (1-20):1. By combination of the two compounds, the unexpected synergistic effect can be obtained on the basis of no increase of the cost of the flocculant for sludge treatment, so that flocs formed in the flocculation process of the sludge are dense, the formation of large gelatinous flocs caused by adding a polymeric flocculant is avoided, and the moisture in the flocs can be optimally released so as to reduce the final water content in the sludge; and meanwhile, the specific resistance of the sludge can be remarkably improved, so that the filtration characteristic of the sludge is improved.

Description

technical field [0001] The invention belongs to the field of sludge dewatering, in particular to a high molecular polymer used for sludge dewatering. Background technique [0002] With the popularization of sewage treatment facilities and the improvement of treatment rate, the amount of sludge produced by sewage plants has increased significantly. The sludge produced by sewage treatment has a relatively high water content. Generally, the water content in the sludge reaches 95% to 99.5%. Because the water is very tightly combined with the sludge particles, it is difficult to separate the water in the sludge at low cost and efficiently. It is necessary to add a flocculant to improve the colloidal properties of the sludge, neutralize the surface charge of the sludge, make the sludge aggregate into large particles, and at the same time separate the water from the sludge particles to strengthen the dehydration of the sludge. Since the cost of sludge treatment and disposal accoun...

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Problems solved by technology

[0004] The domestic application number is 200810198538.2. The patent uses the surfactant dodecyl dimethyl benzyl ammonium chloride (1227) to treat the sludge. Although it can reduce the specific resistance of the sludge, the researchers found that the single use of dodecane Dimethyl benzyl ammonium chloride has the disadvantages of small sludge floc aggregation particles, which are easy to stick to the filter cloth and make it difficult to filter the void, and the effect will be obvious only when the amount of the surfactant is large.

The patents with domestic application number 200810048825.5 and application number 200710150706.6 use inorganic composite conditioners to treat sludge, and the treatment effect is good, but there are problems such as a decrease in the calorific value of sludge after treatment due to the high addition of inorganic flocculants

The patent with the domestic application number of 200810046020.7 provides a sludge dewatering agent combined with an inorganic flocculant and an organic flocculant. Although it effectively reduces the specific resistance of sludge, it has the disadvantage of increasing the amount of dry sludge, and because of the addition of metal Ions may limit the subsequent utilization of dewatered sludge (or sewage)