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Method for pretreating and strengthening sludge dehydration by using acetylene sludge

A technology of sludge dehydration and carbide slag, which is applied in the direction of dehydration/drying/concentrated sludge treatment, etc., can solve the problems of high energy consumption, threats to the surrounding environment of transportation routes, and increase the difficulty of transportation, etc., and achieve significant technical and economic effects. Facilitate disposal and utilization, reduce dehydration energy consumption

Active Publication Date: 2012-05-02
BEIJING BUILDING MATERIALS ACADEMY OF SCI RES
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] The construction of urban sewage treatment plants in my country has begun to take shape, but the development of sludge treatment and disposal is relatively slow. At present, many sewage treatment plants in my country only carry out simple concentration and dehydration of sludge and then transport it abroad. The sludge treatment is not in place. greatly affects the final disposal of sludge
Even if the sludge is concentrated and dehydrated in the sewage treatment plant, it often fails to meet the requirements, and the moisture content of the sludge is still high. This treatment not only increases the difficulty of transportation, but also poses a threat to the surrounding environment of the transportation route, which is even more serious The most important thing is to bring great inconvenience to the subsequent sludge disposal
[0003] Under normal circumstances, the water content of sludge can be reduced from above 98% to 75% to 86% after being pressed by a filter press. However, continuing to reduce the water content through mechanical pressing not only consumes a lot of energy, but also has no obvious volume reduction effect. related to the characteristics of the sludge itself

Method used

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  • Method for pretreating and strengthening sludge dehydration by using acetylene sludge
  • Method for pretreating and strengthening sludge dehydration by using acetylene sludge

Examples

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Embodiment 1

[0021] An embodiment of a method for utilizing carbide slag pretreatment to strengthen sludge dehydration, see figure 1 , the method comprises adding a modifying agent to the sludge and extruding the sludge, wherein the sludge is firstly processed by adding carbide slag before adding the modifying agent, and the steps of the sludge dehydration method are:

[0022] a. Mix sludge with a moisture content greater than 70% into calcium carbide slag and mix evenly for more than 10 minutes to obtain mixed sludge. The amount of calcium carbide slag is 1% to 50% of the total amount of sludge;

[0023] b. Continue to add 0.5% to 2% modifier of the total amount of sludge for stirring, and the stirring time is longer than 1 minute to obtain sludge with modifier added;

[0024] c. The sludge added with modifier is sent to a plate and frame filter press for extrusion to obtain a dehydrated cake.

[0025] Calcium carbide slag is the waste residue with calcium hydroxide as the main component...

Embodiment 2

[0029] Referring to Example 1, this example is a further preferred example of the content of Example 1. Therefore, the method is further as follows: mixing sludge with a moisture content of 80% and a particle size of 80 mesh to 80 mesh with a moisture content of not more than 30% 100-mesh carbide slag, the mixed calcium carbide slag is 5% of the total volume of the sludge, stirred for 15 minutes, then added a modifier of 0.5% to 2% of the total volume of the sludge, continued to stir for 2 minutes, and sent to the plate Frame filter press to obtain a mud cake with a moisture content of 62% to 64%.

Embodiment 3

[0031] Referring to Example 1, this example is a further preferred example of the content of Example 1. Therefore, the method is further as follows: mixing sludge with a moisture content of 80% and a particle size of 80 mesh to 80 mesh with a moisture content of not more than 30% 100-mesh carbide slag, in which the mixed calcium carbide slag accounts for 8% of the total volume of the sludge, stirred for 15 minutes, then added a modifier that is 0.5% to 2% of the total volume of the sludge, continued to stir for 2 minutes, and sent into Plate and frame filter press to obtain mud cake with a moisture content of 54% to 56%.

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Abstract

The invention discloses a method for pretreating and strengthening sludge dehydration by using acetylene sludge. The method comprises adding a modifier and extruded sludge into sludge, wherein acetylene sludge is added before the modifier is added. The method comprises the following steps of: a, doping sludge of which the water content is higher than 70 percent into acetylene sludge, and stirringand mixing uniformly to obtain mixed sludge, wherein the doping amount of the acetylene sludge is 1-50 percent by volume based on the total amount of the sludge; b, continually adding a modifier in an amount which is 0.5-2 percent by volume based on the total amount of the sludge, and stirring to obtain sludge into which the modifier is added; and c, feeding the sludge into which the modifier is added into a plate-and-frame type filter press for extruding to obtain a dehydrated mud cake. In the method, the acetylene sludge is used together with a general modifier, so that the dehydration rateof mechanical filter pressing is increased, the amount and volume of sludge are reduced, and the dehydration energy consumption is lowered greatly simultaneously. In the method, useful components in acetylene sludge are fully utilized, the aims of changing waste into valuable and protecting the environment are fulfilled, and positive technical progress and remarkable economic effect are achieved.

Description

technical field [0001] The present invention relates to the field of sludge treatment and disposal, in particular to a method for pretreating and strengthening sludge dehydration by using carbide slag, which is a method for pretreating sludge by using carbide slag as a modifier, which can absorb a large amount of solid waste, It is also a method for making full use of useful components in carbide slag. Background technique [0002] The construction of urban sewage treatment plants in my country has begun to take shape, but the development of sludge treatment and disposal is relatively slow. At present, many sewage treatment plants in my country only carry out simple concentration and dehydration of sludge and then transport it abroad. The sludge treatment is not in place. It greatly affects the final disposal of sludge. Even if the sludge is concentrated and dehydrated in the sewage treatment plant, it often fails to meet the requirements, and the moisture content of the slu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F11/14
Inventor 顾军殷杰李春萍芦澍
Owner BEIJING BUILDING MATERIALS ACADEMY OF SCI RES
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