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Method for solidifying and stabilizing sludge

A sludge and dewatered sludge technology, applied in chemical instruments and methods, sludge treatment, water/sludge/sewage treatment, etc., can solve the problems of unfavorable utilization of landfills, high price of bentonite, obstacles to hydration reactions, etc. problem, to achieve the effect of enhanced lateral compressive strength, reduced leaching rate, and reduced capacity expansion ratio

Inactive Publication Date: 2013-12-18
HUNAN UNIV
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Problems solved by technology

The addition of fly ash can reduce the cost of solidification, but fly ash has a certain hindering effect on the hydration reaction of cement; lime and local soil can improve the strength of the solidified body and reduce the amount of cement, but the addition of local soil and lime The volume increase ratio is relatively large, which is unfavorable for the effective use of landfills; bentonite is a good additive to assist cement solidification, but the price of bentonite is relatively high

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  • Method for solidifying and stabilizing sludge
  • Method for solidifying and stabilizing sludge
  • Method for solidifying and stabilizing sludge

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Embodiment Construction

[0022] The technical solutions of the present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0023] From figure 1 It can be seen that when the cement addition is 0.25kg / kg, the compressive strength of the solidified / stabilized sludge increases with the addition of sepiolite, and when the addition of sepiolite is 0.17kg / kg, the solidified sludge The strength of the mud is greater than 50kPa, which meets the requirements of the landfill plant; the addition of sepiolite is 0.3kg / kg, and the strength of the solidified sample reaches 100kPa, which meets the requirements of the building backfill. When the cement content is 0.35kg / kg, the effect of adding sepiolite to improve the strength of solidified sludge is very obvious. When the amount of sepiolite increases from 0 to 0.17kg / kg, the strength of solidified sludge rises from 32.7kPa to 54.8kPa, when the amount of sepiolite is 0.3kg / kg, the strength of solidifie...

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Abstract

The invention relates to a method for solidifying and stabilizing sludge. The ratio of the added amount of cement to the mass of sludge is 0.25, and the ratio of the added amount of sepiolite to the mass of sludge is 0.05-0.30; the sepiolite, cement and sludge are mixed and stirred uniformly and conserved for 28 days. According to the method, sepiolite is used as an additive which is uniformly mixed with residual sludge and cement after mechanical dehydration at certain proportion so as to solidify and stabilize the sludge. Experiments indicate that after adding the sepiolite and conserving the sludge solidified body based on cement solidification for 28 days, the no-lateral confinement compressive strength is greater than or equal to 50-100kPa, the lateral pressure resistance is greatly enhanced, the leaching rate of harmful substances in the sludge is greatly reduced, the sludge solidifying and stabilizing cost is greatly lowered, and the capacity increasing ratio is greatly reduced.

Description

technical field [0001] The invention belongs to the technical field of sewage treatment and relates to a method for solidifying and stabilizing sludge. Background technique [0002] The sludge produced by urban sewage treatment plants is a kind of semi-dry waste with high water content, low shear strength and complex rheology. Considering that indicators such as heavy metals in sludge cannot meet the standards for agricultural use, the cost of incinerating sludge is too high, and the environmental requirements for ash disposal are high. Considering my country's national conditions, sludge landfill is a more reasonable choice. [0003] The mechanism of adding sepiolite to sludge to assist cement in hydration reaction - sepiolite is first added to sludge, sepiolite first absorbs a certain amount of water in sludge, and adsorbs in the early stage of cement hydration reaction Heavy metals released from sludge promote the formation of hydration reactions. After the sepiolite an...

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Application Information

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IPC IPC(8): C02F11/00C02F11/14C02F11/12
Inventor 余健姜明杰
Owner HUNAN UNIV
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