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Sludge and straw mixed squeezing treatment method and device

A treatment method and sludge technology, applied in the fields of sludge treatment, water/sludge/sewage treatment, dehydration/drying/concentrated sludge treatment, etc., can solve the problems of secondary pollution, low utilization efficiency, long time consumption, etc. Achieve the effect of increasing calorific value, low moisture content and reducing affinity

Inactive Publication Date: 2016-03-30
EVERBRIGHT ENVIRONMENTAL PROTECTION TECH RES INST SHENZHEN CO LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it takes 15-50 days to dehydrate sludge and straw with aerobic composting, the utilization efficiency is low, and the odor generated by sludge composting has secondary pollution

Method used

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  • Sludge and straw mixed squeezing treatment method and device

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Effect test

Embodiment 1

[0047] In order to overcome the problems existing in the prior art, the present invention provides an economical, efficient and environmentally friendly technology for mixing and pressing sludge and agricultural waste straw to produce fuel. The core of the method is that the sludge is mixed with the crushed straw powder, and then subjected to deep dehydration in a plate and frame press, and the mud cake after deep dehydration is used for co-incineration with garbage. On the one hand, the moisture content of the sludge is further reduced to 50-55%, on the other hand, the agricultural waste straw is effectively used to realize the resource utilization of the sludge and straw.

[0048] The method for mixing and pressing sludge and agricultural waste straw according to the present invention includes:

[0049] Step S1: Pretreating the sludge to remove part of the water in the sludge;

[0050] Step S2: crushing the agricultural waste straw to the target particle size, and mixing it...

Embodiment 2

[0068] In a certain urban sewage treatment plant, the scale of sewage treatment is 40,000 tons / day, and the sludge output from the secondary sedimentation tank (with a moisture content of 99%) is 480 tons / day. The remaining sludge in the secondary settling tank was filtered through a belt filter press. The flocculant was commercially available PAM, and the dosage was 0.5% by mass of the absolute dry weight of the sludge. 82%, the belt filter press mud output is 26.7 tons / day (moisture content 82%).

[0069] The sludge treated by the belt filter press enters the sludge and straw mixed press incineration system, and the following three processes are carried out:

[0070] (1) The straw is broken into 20mm with a crusher, and the straw powder, flocculant and sludge with a moisture content of 82% are evenly stirred and mixed in a mixer. 20% by mass of the dry weight, the flocculant is polyaluminum chloride, and the dosage is 2% by mass (calculated as 80%);

[0071] (2) The unifor...

Embodiment 3

[0074] In a certain urban sewage treatment plant, the scale of sewage treatment is 100,000 tons / day, and the sludge output from the secondary settling tank (with a moisture content of 99%) is 1,200 tons / day. The remaining sludge in the secondary settling tank is filtered through a belt filter press. The flocculant is commercially available PAM, and the dosage is 0.3% by mass of the absolute dry weight of the sludge. 80% or so, then the mud output of the belt filter press is 60 tons / day (calculated with a moisture content of 80%).

[0075] The sludge treated by the belt filter press enters the sludge and straw mixed press incineration system, and the following three processes are carried out:

[0076] (1) The straw is broken into 25mm with a crusher, and the straw powder, flocculant and sludge with a moisture content of 82% are uniformly stirred and mixed in a mixer. 10% by mass of the dry weight, the flocculant is polyaluminum chloride, and the dosage is 3% by mass (80%);

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Abstract

The invention provides a sludge and straw mixed squeezing treatment method and device. The method comprises the following steps: step S1: pre-treating the sludge so as to remove partial water in the sludge, and allowing the water content of the sludge to be decreased to 75 to 85 percent; step S2: crushing straws to a target granularity, and mixing the crushed straws with the sludge in the step S1; and step S3: squeezing and dehydrating a mixture obtained in the step S2 to obtain a squeezed filter cake. The sludge and straw mixed squeezing treatment method and device have the following advantages: 1, the sludge and the straw powder are ensured to be uniformly mixed; a screw transport mixer is employed in the stirring and mixing process of the sludge and the straw powder, and the rotation speed of the screw transport mixer is 40 to 60 rpm / min, so that the sludge and the straw powder are uniformly mixed, and the sludge and the straw are transported forwards while in stirring and mixing, therefore, not only can the mixing time be controlled, but also the sludge is not thinned due to the excessively stirring, and the adherence of the sludge onto the wall is avoided; and 2, the water content is low after the sludge is squeezed, so that the total heat value is increased.

Description

technical field [0001] The invention relates to a technique for mixing and pressing sludge and agricultural waste straw and using it in a waste incineration plant, which is suitable for waste incineration power generation projects. The method can realize sludge reduction, stabilization, harmlessness and resource utilization, and belongs to the technical field of sludge treatment and disposal. Background technique [0002] As an inevitable product of sewage treatment plants, municipal sludge is solid waste generated during the treatment of urban domestic sewage and industrial wastewater. With the development of society and the gradual improvement of living standards, the output of urban sewage is also increasing, which leads to an increase in the output of urban sludge. According to statistics, the amount of sludge discharged each year in my country is about 22 million tons (calculated with a water content of 80%), and if such a huge amount of urban sludge is not properly di...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F11/12C02F11/14C02F11/00C10L5/46F23G7/00F23G7/10
CPCY02E50/10Y02E50/30C02F11/12C02F11/00C02F11/14C02F2303/06C10L5/46C10L2290/08C10L2290/24C10L2290/30F23G7/001F23G7/10F23G2201/20F23G2201/702F23G2201/80
Inventor 阮燕霞肖诚斌高兴斋苏勇唐侠李成海徐伟江朱浩何志锋叶明琪
Owner EVERBRIGHT ENVIRONMENTAL PROTECTION TECH RES INST SHENZHEN CO LTD
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