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Efficient dehydration method for urban construction waste mud

A waste mud, high-efficiency technology, applied in chemical instruments and methods, water/sludge/sewage treatment, sludge treatment, etc., can solve the problem of not considering the influence of the flocculant filter press dehydration performance, etc., to facilitate outbound disposal. Or reuse, improve dehydration efficiency, and quickly reduce the effect of dehydration

Active Publication Date: 2020-06-19
南京环境集团有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, most of the flocculants and their additions required for mud treatment in most projects are determined by the index of mud flocculation and sedimentation rate, which only considers the rapid dehydration reduction, and does not consider the influence of flocculants on the dewatering performance of mud press filtration.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] The moisture content of the waste mud produced by the foundation excavation of a construction site is 620% (moisture content on a dry basis, the same below).

[0025] Through the flocculation test, cationic polyacrylamide (molecular weight 12 million) was finally selected as the optimal flocculant, and the optimal addition amount was 0.2% (according to the addition of mud dry matter, the same below). The Cu of the mud after flocculation was 7.8, and the moisture content of the concentrated mud is 186%.

[0026] According to the percentage by weight, 55% of lime, 12% of sawdust, 18% of fly ash, and 15% of slag are added to the mud with a weight ratio of 7%, and stirred evenly.

[0027] Press filter at 0.9 MPa for 35 minutes on a plate and frame filter press, and the moisture content of the mud cake after the filter press is 28.2%.

Embodiment 2

[0029] The moisture content of the waste mud generated from the construction of cast-in-place piles at a construction site is 850%.

[0030] Through the flocculation test, anionic polyacrylamide (molecular weight: 15 million) was finally selected as the optimal flocculant, the optimal addition amount was 0.1%, the Cu of the mud after flocculation was 6.5, and the moisture content of the concentrated mud was 170%.

[0031] According to the weight percentage calculation, 50% of lime, 10% of sawdust, 20% of fly ash, and 20% of slag are added to the mud at a weight ratio of 5%, and stirred evenly.

[0032] Press filter at 0.8 MPa for 30 minutes on a plate and frame filter press, and the moisture content of the mud cake after the filter press is 27.2%.

[0033] The present invention fully combines the mud-water separation rate and the mud dehydration performance after flocculation to select the flocculant and the addition amount, which not only ensures the mud settlement rate, real...

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PUM

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Abstract

The invention discloses a high-efficiency dehydration method for urban construction waste mud. The method comprises the following steps: (1) carrying out a mud flocculation and sedimentation test, anddetermining an optimal flocculant and an optimal additive amount according to two indexes, namely an after-flocculation mud particle non-uniform coefficient Cu and a mud sedimentation rate; (2) carrying out flocculation treatment on waste mud by using the optimal flocculant with the addition amount of the optimal flocculant being the optimal addition amount, and discharging the supernatant afterflocculating and settling for a period of time to obtain concentrated mud; (3) adding a medicament consisting of lime, fly ash, sawdust and slag into the concentrated mud, and stirring; and (4) carrying out filter pressing on the concentrated mud by using a mud-water separation device to generate a mud cake with low water content. According to the invention, with the method, the problem of safe disposal of urban construction waste mud is solved, and resource cyclic utilization is achieved to a certain extent; and the produced mud cake has high strength, can be reutilized, and has good social benefit and economic benefit.

Description

technical field [0001] The invention belongs to the technical field of resource and environment protection, and in particular relates to a high-efficiency dehydration method for urban construction waste mud. Background technique [0002] Large-scale urban construction will produce a large amount of waste construction mud. If it is not disposed of properly, it will not only occupy a large amount of valuable land resources for stacking, but also the pollutants contained in the mud will pollute the soil, groundwater, and surface water. The safe disposal and resource utilization of construction mud has become one of the bottlenecks restricting the development of urban construction. [0003] The current treatment method is to first dehydrate and reduce the weight by adding flocculant, and then use belt filter press, plate and frame filter press, centrifuge and other machinery to dehydrate the flocculated mud deeply, and finally transport it abroad. The flocculant destabilizes th...

Claims

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Application Information

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IPC IPC(8): C02F11/122C02F11/143C02F11/145
CPCC02F11/143C02F11/145C02F11/122
Inventor 张吕林韩学祥龚习炜曾文超单磊
Owner 南京环境集团有限公司