Deep sludge dewatering method and cement kiln comprehensive utilization method using same

A deep dewatering and cement kiln technology, applied in the direction of dewatering/drying/concentrating sludge treatment, etc., can solve the problems of reducing equipment processing capacity, affecting resource utilization, reducing the calorific value of mud cake, etc., to reduce operating costs, increase The effect of equipment processing efficiency and high replacement rate

Active Publication Date: 2014-05-28
华新环境工程有限公司 +1
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  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

At present, lime is mostly used for dewatering sludge, and it is used together with ferric chloride. Although the traditional ferric chloride + lime solution has low cost of chemicals, simple operation and maintenance, and high degree of sludge dehydration, there are some insurmountable problems: a large amount of investment Adding ferric chloride will introduce more chlorine elements into the mud cake, which will have adverse effects on the subsequent cement kiln co-processing and incineration disposal of the mud cake; adding a large amount of lime will greatly increase the amount of mud cake, reduce the processing capacity of the equipment, and reduce the mud cake The calorific value is greatly reduced, which affects the subsequent utilization of resources, and lime itself is a high-energy-consuming industry

Method used

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  • Deep sludge dewatering method and cement kiln comprehensive utilization method using same

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Experimental program
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Effect test

Embodiment 1

[0026] Embodiment 1: A kind of sludge deep dehydration process: specific steps:

[0027] Step A1: Dilute the wet sludge with a water content of about 80% from the sewage plant to a water content of 92-94%;

[0028] Step A2: Add ferric chloride as an inorganic iron salt coagulant, the dosage is controlled at 20-30kg / ton of wet sludge, and fully stirred for 5-10 minutes;

[0029] Step A3: Transport the evenly stirred sludge mixture to a high-pressure diaphragm plate-and-frame filter press through a screw pump, and add polyacrylamide as an organic macromolecule flocculant through pipelines while feeding the sludge. The mass concentration of acrylamide is diluted to about 1‰, and the dosage is 1.5-3kg / ton of wet sludge. The moisture content of the obtained mud cake is about 60%, that is, the moisture content is ±60%.

[0030] In the above technical solution, the polyacrylamide used in step A3 is cationic polyacrylamide.

[0031] In the above technical solution, in step A3: trans...

Embodiment 2

[0047] Transport the wet sludge with a moisture content of about 80% to the sludge conditioning and mixing tank, add water to dilute to a moisture content of 94%, and first add ferric chloride solution with a concentration of 38% to the sludge and fully stir for 10 minutes. The dosage of ferric chloride solution is 2.2% of the wet sludge mass, and then the sludge is transported to the high-pressure diaphragm plate and frame filter press through the screw pump, and polyacrylamide is added through the pipeline dosing method while transporting the sludge , the dosage of polyacrylamide is 2.2‰ of the mass of wet sludge. After the feed filtration and secondary pressing of the high-pressure diaphragm plate and frame filter, the sludge particles are trapped in the filter chamber and gradually form a filter cake. The moisture content of the final filter cake is 58.9%.

Embodiment 3

[0049] Transport the wet sludge with a moisture content of about 80% to the sludge conditioning and mixing tank, add water to dilute to a moisture content of 93%, and first add ferric chloride solution with a concentration of 38% to the sludge and fully stir for 10 minutes. The dosage of ferric chloride solution is 2.7% of the mass of wet sludge, and then the sludge is transported to the high-pressure diaphragm plate and frame filter press through the screw pump, and polyacrylamide is added through the pipeline dosing method while transporting the sludge , the dosage of polyacrylamide is 2.1‰ of the mass of wet sludge. After the feed filtration and secondary pressing of the high-pressure diaphragm plate and frame press, the sludge particles are trapped in the filter chamber and gradually form a filter cake. The final moisture content of the filter cake is 59.86%.

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Abstract

The invention relates to a deep sludge dewatering method and a cement kiln comprehensive utilization method using the same. Ferric trichloride is added and serve as an inorganic ferric salt coagulant, the uniformly stirred sludge mixed liquor is conveyed by a screw pump to a high pressure membrane plate-and-frame filter press for filter pressing, polyacrylamide is added to serve as an organic polymer flocculant while the sludge is fed, a sludge cake with the moisture content of 50-61.33% is finally obtained, and the sludge cake is subjected to dried with waste heat and is comprehensively utilized for a cement kiln after dewatered. The adsorption charge neutrality and the adsorption bridging action of cationic polyacrylamide are used to flocculate the sludge particles, meanwhile, as the selected polyacrylamide has a special branch chain cross-linked structure, the formed floc is small and pressuerproof, and is good for improving the dewatering degree of the sludge. Compared with the tradition, the dosage is reduced greatly, the yield of the cake and the introduction of a harmful element Cl are reduced, the equipment processing efficiency is increased, the heat value of the sludge is kept to the greatest extent, the treatment of the waste gas in a kiln head is taken into comprehensive consideration with a cement kiln system, the capital investment is saved, and the operation cost is lowered.

Description

technical field [0001] The invention relates to the technical field of sludge treatment, in particular to a method for deep dehydration of sludge and comprehensive utilization of cement kilns. Background technique [0002] In the sludge treatment process, before the sludge is subjected to filter press treatment, it is generally necessary to flocculate and modify the sludge for subsequent press filter and deep dehydration. At present, lime is mostly used for dewatering sludge, and it is used together with ferric chloride. Although the traditional ferric chloride + lime solution has low cost of chemicals, simple operation and maintenance, and high degree of sludge dehydration, there are some insurmountable problems: a large amount of investment Adding ferric chloride will introduce more chlorine elements into the mud cake, which will have adverse effects on the subsequent cement kiln co-processing and incineration disposal of the mud cake; adding a large amount of lime will gr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F11/12C02F11/14C04B7/43
Inventor 李叶青王焕忠张江黄晓理任跃军缪文娟
Owner 华新环境工程有限公司
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