Method for improving dewatering performance of concentrated sludge

Abstract

The invention discloses a method for improving the dewatering performance of concentrated sludge, and relates to the technical field of sludge dewatering. The method includes the steps: a, feeding sulfuric acid into the sludge, adjusting the PH (potential of hydrogen) of the sludge to be 3-3.5, feeding flocculating agents into the sludge and flocculating sludge particulates; b, adding surfactants,performing low-speed stirring for 7-9 minutes, adding hydrogen peroxide mixed solution, performing oxidization for 34-36 minutes and finishing primary dewatering of the sludge by a vacuum filter; c,adding hydrolytic acidification bacteria into the sludge subjected to primary dewatering in the step b under the condition of 33-35 DEG C, increasing temperature to 53-55 DEG C, adding acetogenic bacteria and methanogenic bacteria, degrading organic substances in the sludge and then feeding calcined lime and walnut shells; d, treating the sludge in the step c by ultrasonic waves with the power of11.5-12W / L. Ultrasonic time is 125-130 seconds, sound energy density is 0.14-0.15W / mL, the regulated sludge to be dewatered is conveyed to a centrifugal dehydrator, secondary dewatering treatment is finished, and the sludge can be dewatered.

Description

technical field [0001] The invention relates to the technical field of sludge dewatering, in particular to a method for improving the dewatering performance of concentrated sludge. Background technique [0002] The dehydration of concentrated sludge has always been a worldwide problem, especially the concentrated sludge produced by industrial wastewater treatment contains a large amount of organic matter, which has strong hydrophilicity and high bound water content. Plate and frame filter press, belt dehydrator, vacuum dehydration The dehydration rate is slow when the machine is used for mechanical dehydration, the water content of the mud cake is high, the effect is generally not ideal, the specific resistance of the sludge is high, and the dehydration rate is slow. Contents of the invention [0003] The technical problem to be solved by the invention is how to reduce the sludge specific resistance and improve the dewatering performance. [0004] In order to solve the ab...

AI Technical Summary

Problems solved by technology

[0002] The dehydration of concentrated sludge has always been a worldwide problem, especially the concentrated sludge produced by industrial wastewater treatment contains a large amount of organic matter, which has strong hydrophilicity and high bound water content. Plate and frame filter press, belt dehydrator, vacuum dehydration The dehydration rate is slow when the machine is used for mechanical dehydration, the water content of the mud cake is high, the effect is generally not ideal, the specific resistance of the sludge is high, and the dehydration rate is slow