A method for deep dehydration of sludge at room temperature

A deep dehydration and sludge technology, which is applied in water/sludge/sewage treatment, sludge treatment, chemical instruments and methods, etc. It can solve the problems of large amount of sludge modification agents, large energy and resource consumption, and water content in mud cakes. High efficiency and other problems, to achieve the effect of reducing sludge surface potential, reducing treatment costs, and reducing dehydration efficiency

Active Publication Date: 2016-09-07
SHENZHEN HONGKONG INSTITUTION OF IND EDUCATION & RES ENVIRONMENTAL ENG TECH CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, there have been some researches and applications on sludge deep dewatering technology, but there are still problems such as large amount of sludge modification agents, low dehydration efficiency, high water content of mud cake after dehydration, high pressing pressure, and large energy resource consumption. question

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] (1), take the dewatered sludge (moisture content 75%, organic content 35%) of a domestic sewage treatment plant in Nanshan District, Shenzhen, and dilute it to a moisture content of 90%;

[0023] (2), add type I sludge modifier to the above-mentioned diluted sludge, the addition amount is 4.0% of the absolute dry sludge, fully stir for 15 minutes, wherein by weight, sulfuric acid in the type I sludge modifier The aluminum content is 15%, the sodium chloride content is 30%, the sodium sulfate content is 20%, and the magnesium chloride hexahydrate content is 35%;

[0024] (3), add type II sludge modifier, the addition is 5.0% of absolute dry sludge amount, fully stirs 10 minutes, wherein by weight, calcium hydroxide content is 70% in the type II sludge modifier, Sodium hydroxide content is 30%,;

[0025] (4), add III type sludge modifying agent, addition is 1.0% of absolute dry sludge amount, fully stirs 5 minutes, wherein by weight, polyferric sulfate content is 30% in ...

Embodiment 2

[0029] 1. Take the dehydrated sludge (moisture content 83%, organic content 43%) from a domestic sewage treatment plant in Baoan District, Shenzhen, and dilute it to a moisture content of 95%;

[0030] 2. Add Type I sludge modifier to the above-mentioned diluted sludge, the added amount is 3.0% of the absolute dry sludge, and fully stir for 15 minutes. Among them, by weight, the content of aluminum sulfate in Type I sludge modification The content of sodium chloride is 20%, the content of sodium chloride is 30%, the content of sodium sulfate is 15%, and the content of magnesium chloride hexahydrate is 35%;

[0031] 3. Add Type II sludge modifier, the addition amount is 5.0% of the absolute dry sludge, and fully stir for 10 minutes. In terms of weight, the content of calcium hydroxide in Type II sludge modifier is 90%, hydroxide Sodium content is 10%;

[0032] 4. Add Type III sludge modifier, the addition amount is 2.0% of the absolute dry sludge, and stir for 5 minutes. Among...

Embodiment 3

[0036] 1. Take the dewatered sludge (moisture content 73.4%, organic matter content 37.0%) from a domestic sewage treatment plant in Binzhou City, Shandong Province, and dilute it to a moisture content of 93%;

[0037] 2. Add Type I sludge modifier to the above-mentioned diluted sludge, the added amount is 0.1% of the absolute dry sludge, and fully stir for 15 minutes. Among them, by weight, the content of aluminum sulfate in Type I sludge modification The content of sodium chloride is 18%, the content of sodium chloride is 20%, the content of sodium sulfate is 32%, and the content of magnesium chloride hexahydrate is 30%;

[0038]3. Add type II sludge modifier, the addition amount is 15.0% of the absolute dry sludge, and fully stir for 10 minutes, of which the content of calcium hydroxide in type II sludge modifier is 80% and hydroxide Sodium content is 20%;

[0039] 4. Add type III sludge modifier, the addition amount is 2.0% of the absolute dry sludge, and stir for 5 minut...

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PUM

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Abstract

The invention discloses a sludge normal-temperature deeply dehydrating method which includes following steps: (1) adding a I-type sludge modification agent, a II-type sludge modification agent and a III-type sludge modification agent to the sludge being 90-98% in water content for conditioning and modification; (2) pumping the conditioned and modified sludge into a press-filtering machine and maintaining the pressure at 1.2-1.6 MPa for 40-50 min to dehydrate the sludge. In the invention, by means of the addition of the specially-use high-efficient composite sludge modification agents and an optimized press-filtering dehydrating process, the dehydration effect of sludge can be improved greatly. The sludge from a waste water treatment plant can be dehydrated to the water content of 40-50% by one step at the normal temperature, thereby satisfying national relative standard and specified requirement.

Description

technical field [0001] The invention belongs to the field of sludge treatment, and in particular relates to a method for deep dehydration of sludge at normal temperature. Background technique [0002] With the development of my country's urban economy and the increase of population, environmental pollution is becoming more and more serious, and the state has increased investment in the construction of sewage treatment facilities. With the popularization of sewage treatment facilities, the improvement of treatment capacity and the deepening of treatment degree, the generation of sludge has also increased greatly. [0003] While the sewage treatment plant is purifying the sewage, the amount of sludge produced accounts for about 0.3% to 0.5% of the total sewage treatment volume (the water content is calculated as 97%). If the sewage is treated in depth, the amount of sludge may increase by 0.5 ~ 1.0 times. Sludge usually contains a large amount of toxic and harmful substances...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F11/14C02F11/12
CPCC02F11/122C02F11/14C02F2303/06
Inventor 王波杨小毛李旭宁
Owner SHENZHEN HONGKONG INSTITUTION OF IND EDUCATION & RES ENVIRONMENTAL ENG TECH CO LTD
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