Method for treating viscose sludge by utilizing modified dextran

Abstract

The invention relates to a method for treating viscose sludge by utilizing modified dextran. The method comprises the following steps of: (1) blending a modified dextran solution; (2) mixing pretreated sludge and activated sludge in the viscose fiber production process, adding a blended modified dextran solution, and stirring to obtain a sludge-water mixed solution; and (3) dehydrating the sludge-water mixed solution by using squeezing dehydration equipment. The modified dextran is adopted to treat sludge, and the process operation is more stable and safer. Due to the organic characteristics of the modified dextran, the modified dextran can be degraded in the process, and the solid content of the sludge cannot be increased. The modified dextran is not adhered to filter cloth in the filterpressing process, and the cost of the filter cloth can be saved. Large-particle substances are not added into the sludge, and equipment such as a pump body cannot be abraded. The produced high-zinc sludge can be sold outside, and the operation cost is reduced. The modified dextran is applied to treatment of viscose sludge, reduction and synergy of solid waste are achieved, and the method has promotion and guidance significance for sludge treatment in the viscose industry.

Description

technical field [0001] The invention relates to a method for treating viscose fiber sludge by using modified dextran, which belongs to the field of viscose fiber production, in particular to the field of sludge treatment in viscose fiber water treatment. Background technique [0002] At present, most viscose fiber factories adopt biochemical treatment system. The activated sludge produced by the biochemical system contains a large amount of colloidal particles and has a strong affinity with water. Without proper treatment, sludge dehydration will be very difficult. The current sludge treatment methods in the chemical fiber industry are roughly divided into two categories: one is to add cationic flocculants to the sludge and then add polyaluminum or polyferric salt, and use a belt filter machine or ordinary plate and frame filter press to treat the sludge, and the dehydrated filter cake contains water In 75%-80%, due to the addition of more heavy metal substances in this kind...

AI Technical Summary

Problems solved by technology

This method has high operating costs, and the leachate in the sludge treatment process contains a high concentration of heavy metals, which is likely to pollute the water body; another method is to use calcium carbide slag or lime powder to increase the sludge skeleton during the treatment process to achieve Sludge effect, because calcium carbide slag or lime powder is highly alkaline, in order to ensure that the pH index of the mud cake after dehydration is strictly controlled within a certain range (pH2 SO 4 Resetting the pH value of the sludge, this process often causes the filter cloth to be clogged during the subsequent pressing and filtering process of the ordinary plate and frame filter press or high pressure plate and frame filter press, and the large particles in the sludge wear the screw pump and other equipment

The operation control is unstable, which may cause the water content of the mud to be high, and the mud cake will not be formed, resulting in difficulties in external transportation and easy to cause secondary pollution.