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Excess sludge deep dehydration conditioner

A deep dehydration and sludge dehydration technology, applied in the direction of dehydration/drying/thickened sludge treatment, etc., can solve the problems of large dosage of sludge conditioner, corrosion of incineration equipment, lower calorific value, etc., and achieve resource utilization , the effect of wide source of raw materials and low price

Inactive Publication Date: 2015-09-23
JIANGNAN UNIV
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Problems solved by technology

[0003] In order to promote the development of sludge incineration technology that can fully carbonize sludge organic matter, kill pathogens, and minimize sludge volume and heavy metal hazards, it is necessary to solve the problems of large dosage of sludge conditioner, corrosion of incineration equipment, and reduction of organic matter. Lower calorific value is not conducive to incineration and other issues

Method used

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  • Excess sludge deep dehydration conditioner

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Effect test

Embodiment 1

[0035] The test sludge was taken from Huilian Thermal Power Plant, the moisture content of the raw sludge was 84.67%, and the moisture content of the sludge was adjusted to 95% before the test. Add 30% rice husk + 0.3% PAM, 30% rice husk + 0.3% PAM + 5% FeCl of sludge dry solids 3 , 30% lime + 0.3% PAM + 5% FeCl 3 , PAM as a 0.1% solution, FeCl 3 as a 33% solution. After stirring and conditioning, press with a plate and frame filter press, wherein the feeding pressure is 0.5-0.8Mpa, the time is 25-30min, and the pressing pressure is 1.8Mpa, and the time is 40min. Adopt rice husk powder after passing through 30 mesh sieves. The main test indicators are sludge moisture content, organic matter content and calorific value, and the results are shown in Table 1.

[0036] Table 1 Results of dehydration experiment of rice husk powder

[0037]

[0038] It can be seen from Table 1 that adding 30% rice husk + 0.3% PAM and 30% rice husk + 0.3% PAM + 5% FeCl 3 After conditioning, ...

Embodiment 2

[0041] The present invention compares the effects of rice husk powder and lime on the dry basis calorific value of sludge. It was found that with the increase of CaO dosage, the sludge wall was broken under the action of high temperature and high pH, ​​a large amount of organic matter was transferred to the liquid phase, and its calorific value decreased accordingly. When the dosage was 60%, It is only 1600kJ / kg, a decrease of 36%, indicating that although the use of CaO can reduce the water content, it is not suitable to use CaO for dehydration. However, when rice husk powder is added, the calorific value of sludge gradually increases. On the one hand, because rice husk powder is organic matter, adding it will increase the calorific value; on the other hand, it is because rice husk powder only acts as a skeleton structure , will not destroy the microbial cell structure of the sludge, making it easy to incinerate.

[0042]In addition, the impact of rice husk and lime on the u...

Embodiment 3

[0044] Get sludge (water content 95%) in conditioning cup, add the rice husk (crossing 60 mesh sieves) that the quality is 20% of sludge dry solids, conditioning cup is placed on the blender, first quick stirring (300r / min) for 5 min, then stir slowly (50r / min) for 20 min. After the conditioned sludge was evenly stirred with a glass rod, it was subjected to suction filtration, and various parameters of the sludge were measured after suction filtration. Each group of experiments was repeated twice to reduce errors. The results show that the sludge specific resistance is 2.9x10 13 m / kg, the moisture content of the filter cake is 82.3%, the organic matter content is 67.2%, and the calorific value is 2686kJ / kg. Under the same conditions, compared with the sludge conditioned by adding sawdust, the sludge conditioned by adding rice husk powder, the sludge specific resistance and filter cake water content decreased by 3.3% and 2.5% respectively, and the organic matter content and c...

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Abstract

The invention discloses an excess sludge deep dehydration conditioner, and belongs to the technical field of sludge treatment. Rice hull powder is adopted as the sludge dehydration conditioner, so that the defects that at present, FeCl3 and CaO can corrode incineration facilities, and incineration is influenced along with the reduction of organic matters are overcome; compared with a manner that chemical conditioners or wood chips are used, the effect of rice hull powder is better, the raw materials source is wide, the price is low, and the problem of how to realize waste resource utilization of rice hull powder in the prior art can also be solved.

Description

technical field [0001] The invention relates to a conditioner for deep dehydration of surplus sludge, which belongs to the technical field of sludge treatment. Background technique [0002] At the end of the "Twelfth Five-Year Plan", my country's urban sewage treatment plants will reach 4,000, and the construction and operation of sewage treatment plants will produce a large amount of surplus sludge. Based on a moisture content of 80%, the total annual sludge production in the country will soon be Exceeding 30 million tons, it is estimated that by 2020, my country's sludge output will exceed 60 million tons per year. At the same time, due to the high sand content and heavy metal concentration in sludge, it will significantly affect the effect of sludge anaerobic digestion and land use. Therefore, it is adopted The disposal method of sludge incineration is more appropriate. When sludge incineration is carried out, the deep dehydration method of chemical conditioning is general...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F11/14C02F11/12
Inventor 王硕沈佳楠陈晓光李激杨倩倩
Owner JIANGNAN UNIV
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