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Combined conditioning method for sludge high-efficient dehydration

A sludge and high-efficiency technology, which is applied in the field of combined conditioning of high-efficiency sludge dewatering, can solve the problems of low moisture content of dewatered cakes, achieve the effects of improved sludge dewatering performance, good flocculation, and improved sludge dewatering performance

Inactive Publication Date: 2015-10-14
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it is often difficult for the existing conditioners to act alone to make the moisture content of the dewatered cake less than 60%. More and more attention has been paid to development research

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Dewatering the concentrated sludge of Gaobeidian Sewage Treatment Plant by plate and frame filter press, the specific process is as follows:

[0030] Take 300L of concentrated sludge and place it in a reaction tank, and take samples to measure the basic characteristics of the sludge to be dewatered. The pH value is 6.8, the water content is 98%, and the sludge capillary water absorption time (CST) is 39s, which is moderately difficult to dehydrate. Open stirring device (120r / min), and add the concentrated sulfuric acid that mass percentage concentration is 98% thereinto, until the pH of adjustment sludge is 4, continue stirring 15min; Calculate the total solid content of sludge to be dewatered to be 6kg, to Add 0.3% of strong oxidizing agent potassium ferrate (namely, add 18g of potassium ferrate) to the sludge that has been acidified. Stir at a slow speed for 30 minutes; add polyferric sulfate to the sludge conditioning system to be 10% of the total dry solid content o...

Embodiment 2

[0032] Dewatering the concentrated sludge of Gaobeidian Sewage Treatment Plant by plate and frame filter press, the specific process is as follows:

[0033] Take 300L of concentrated sludge and place it in a reaction tank, and take samples to measure the basic characteristics of the sludge to be dewatered. The pH value is 6.8, the water content is 98%, and the sludge capillary water absorption time (CST) is 39s, which is moderately difficult to dehydrate. Open stirring device (120r / min), and add the concentrated sulfuric acid that mass percent concentration is 98% thereinto, until the pH of adjustment sludge is 4, continue to stir 15min; Calculate the total solid content of dewatered sludge to be 6kg, to Add 2% of the strong oxidant potassium ferrate (that is, add 120g of potassium ferrate) to the sludge that has been acidified. Stir slowly for 40 minutes; add polyferric sulfate to the sludge conditioning system to be 8% of the total dry solid content of the sludge. Before add...

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Abstract

The invention relates to a combined conditioning method for sludge high-efficient dehydration, and belongs to the field of sludge dehydration pretreatment. The method comprises the following steps: acidifying sludge to be dehydrated by concentrated sulfuric acid, adjusting the pH value of the sludge system to a range of 3.5-5, continuously stirring the sludge system by a stirring pad for 15 to 30 minutes; adding a strong oxidant (potassium ferrate) accounting for 0.2 to 4% of the total dried sludge weight into the acidified sludge, wherein the potassium ferrate is dissolved by water before addition; rapidly stirring the sludge for 2 minutes at a stirring speed of 200 to 300 r / min, then slowly stirring the sludge for 20 to 40 minutes at a stirring speed of 80 to 150 r / min; then adding polymeric ferric sulfate accounting for 6 to 12% of the total dried sludge weight into the sludge conditioning system, wherein the polymeric ferric sulfate is dissolved by water to prepare a solution with a mass concentration of 20-50% before addition; keeping on stirring at a slow stirring speed for 15 to 30 minutes; then adding quicklime accounting for 3 to 8% of the total dried sludge weight into the sludge conditioning system, adjusting the pH value to a range of 6-8, evenly dispersing the quicklime, and immediately dehydrating the sludge.

Description

technical field [0001] The invention relates to a combined conditioning method for high-efficiency sludge dehydration, belonging to the field of sludge dehydration pretreatment. Background technique [0002] Sludge conditioning is a necessary preparation for sludge dewatering. In order to solve the problems of difficult dehydration and high water content after dehydration in the process of sludge treatment and disposal, it is necessary to use sludge pretreatment technology to condition or break the sludge to improve the sludge quality. Mud dehydration properties. From a large perspective, sludge pretreatment can generally be divided into three types: physical method, chemical method, biological method and their combination. [0003] (1) Physical method generally refers to the method of changing the properties of sludge through physical action. Such as freezing treatment, ultrasonic treatment, high pressure treatment, etc. [0004] (2) The chemical method is to change the ...

Claims

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Application Information

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IPC IPC(8): C02F11/14C02F11/12
Inventor 李军孟维举卞伟刘彬
Owner BEIJING UNIV OF TECH
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