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Combination type efficient sludge dewatering conditioning method

A combined and sludge technology, which is applied in the direction of dehydration/drying/thickened sludge treatment, etc., can solve the problem of low moisture content in dewatered cakes, and achieve the effects of enhanced lysis effect, good flocculation, and sufficient dehydration

Active Publication Date: 2015-09-09
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 capillary water absorption time (CST) of the sludge 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; adjust the pH of the sludge conditioning system to 4, add ferrous sulfate to 5% of the total...

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 capillary water absorption time (CST) of the sludge 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 2% of the strong oxidant potassium ferrate (that is, add 120g of potassium ferrate) to the sludge that has been acidified. Stir at a slow speed for 40 minutes; adjust the pH of the sludge conditioning system to 4, add ferrous sulfate to 6% of the total dry...

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Abstract

The invention relates to a combination type efficient sludge dewatering conditioning method and belongs to the field of sludge dewatering preprocessing. According to the technical scheme, the method includes performing acidification treatment on sludge to be dewatered through concentrated sulfuric, adjusting the pH of a sludge system to range from 3.5 to 5, and stirring for 15 to 30min through a stirring blade; adding strong oxidizing agent, namely potassium ferrate, with the content of 0.2% to 4% of the total solid sludge into acidified sludge after water dissolving, stirring for 2min in the speed of 200 to 300 r / min rapidly, and stirring for 20 to 40min in the speed of 80 to 150 r / min slowly; adjusting the pH to range from 3.5 to 5 through concentrated sulfuric, adding ferrous sulfate with the content of 4% to 8% of the total solid sludge after preparing the ferrous sulfate as solution with the concentration of 20% to 50%, after stirring and scattering, adding H2O2, with the concentration of 30%, with the content of 4% to 8% of the total solid sludge, and reacting for 30 to 50min completely during slow stirring; finally, adding quicklime with the content of 3% to 8% of the total solid sludge into the sludge conditioning system, adjusting the system pH to range from 6 to 8, scattering the quicklime evenly, and dewatering.

Description

technical field [0001] The invention relates to a conditioning method for combined efficient dehydration of sludge, which belongs 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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Patent Type & Authority Applications(China)
IPC IPC(8): C02F11/14
Inventor 李军孟维举卞伟刘彬
Owner BEIJING UNIV OF TECH
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