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Curing agent for curing landfill leachate membrane concentrated liquor and evaporation mother liquor

A technology of landfill leachate and mother liquor evaporation, which is applied in the field of landfill leachate treatment in environmental engineering, can solve the problems of low strength and large consumption, and achieve the effects of improving early strength, reducing production costs, and reducing carbon emissions

Pending Publication Date: 2020-10-23
XIAMEN JIARONG TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to overcome the deficiencies in the prior art, and to provide a curing agent for curing landfill leachate film concentrate and evaporation mother liquor, which solves the slurry that occurs when cement solidification film concentrate and evaporation mother liquor The problems of bleeding and stratification, low strength of solidified body and large dosage can improve the early strength of solidified body, meet the concentration limit of leachate pollutants in domestic waste landfills, and meet landfill requirements

Method used

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  • Curing agent for curing landfill leachate membrane concentrated liquor and evaporation mother liquor
  • Curing agent for curing landfill leachate membrane concentrated liquor and evaporation mother liquor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] (1) Take the dry raw materials for the curing agent for the solidified film concentrate according to the following weights: 0.35kg of granulated blast furnace slag powder, 0.15kg of fly ash, 0.15kg of ordinary Portland cement, 0.05kg of calcium oxide, sodium sulfate 0.08kg, calcium formate 0.02kg, chitosan 0.04kg, diatomite 0.08kg, Wenlun glue 0.03kg, desulfurization gypsum 0.03kg, alum stone powder 0.02kg; put the above raw materials into the mixer and mix well Finally, a powdery curing agent is formed, sealed and stored;

[0018] (2) Mix the solidifying agent prepared above with 2.5 kg of the membrane filter concentrate with a water content of 86.6%, stir it evenly with a high-speed mixer, and mold it in a steel test mold, and remove the mold after losing plasticity. The final cured body is cured to the specified age in a standard curing room with a room temperature of 20±2°C and a relative humidity of ≥90%, and then the compressive strength of the cured sample is mea...

Embodiment 2

[0020] (1) Take by weighing the dry raw material of the solidifying agent that is used for curing evaporation mother liquor according to following weight: Granulated blast furnace slag powder 0.3kg, silica fume 0.15kg, ordinary portland cement 0.19kg, calcium hydroxide 0.08kg, sodium carbonate 0.05 kg, guar gum 0.08kg, calcium-based bentonite 0.07kg, natural gypsum 0.03kg, aluminum potassium sulfate dodecahydrate 0.05kg; put the above raw materials into a mixer and mix them to form a powdery curing agent after mixing. save;

[0021] (2) Mix the curing agent prepared above with 2.5 kg of the evaporated mother liquor with a water content of 75.78%, stir it evenly with a high-speed mixer, and mold it in a steel test mold. After losing the plasticity, the mold is removed, and the cured body after the mold is removed Measure the compressive strength of the cured sample after curing to the specified age in a standard curing room with a room temperature of 20±2°C and a relative humid...

Embodiment 3

[0023] (1) Take by weighing the dry raw material of the solidifying agent that is used for solidified film concentrated solution according to following weight: Granulated blast furnace slag powder 0.4kg, calcined coal gangue powder 0.1kg, ordinary portland cement 0.1kg, sodium sulfate 0.03kg, carbonic acid 0.09kg of sodium, 0.03kg of calcium formate, 0.08kg of sodium bentonite, 0.04kg of aluminum sulfate, 0.03kg of polymer water-absorbing resin, and 0.1kg of quick-hardening sulfur-aluminum cement; Form a powdery curing agent and keep it sealed;

[0024] (2) Mix the above-mentioned solidifying agent prepared with 2.5 kg of the membrane filter concentrate with a water content of 85.96%, stir it evenly with a high-speed mixer, and mold it in a steel trial mold. After losing the plasticity, remove the mold. The cured body is cured in a standard curing room with a room temperature of 20±2°C and a relative humidity of ≥90%, and then the compressive strength of the cured sample is me...

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Abstract

The invention discloses a curing agent for curing landfill leachate membrane concentrated liquor and evaporation mother liquor. The curing agent is suitable for curing treatment of landfill leachate (hereinafter referred to as membrane concentrated liquor) subjected to membrane treatment and mother liquor (hereinafter referred to as evaporation mother liquor) formed after evaporation of the membrane concentrated liquor. The curing agent is prepared by uniformly mixing a cementing material composed of a mineral admixture and ordinary Portland cement as a main raw material with an alkaline excitation component, a water absorption thickening component and an expansion component, wherein the contents of the components are as follows: 0.35-0.50 parts of mineral admixture, 0.10-0.25 parts of ordinary Portland cement, 0.05-0.15 parts of alkaline excitation component, 0.10-0.15 parts of water absorption thickening component and 0-0.1 parts of expansion component. The curing agent solves the problems of serious slurry bleeding, low cured body strength and later-stage expansion cracking when ordinary Portland cement is used for curing high-water-content, high-organic-matter and high-salt-content membrane concentrated liquor and evaporation mother liquor, and meets the limit value requirement of pollutant mass concentration when a cured sample enters a household garbage landfill to be buried.

Description

technical field [0001] The invention relates to a curing agent for treating landfill leachate film concentrate and evaporated mother liquor, belonging to the field of environmental engineering landfill leachate treatment. Background technique [0002] In 2017, the amount of landfill leachate produced in my country was about 76.794 million tons, and the amount increased year by year. Landfill leachate is wastewater with extremely complex components leached from landfills or incineration power plants. The water quality and quantity will change with the age and season of the landfill, and the content of COD, ammonia nitrogen and heavy metals is very high. Taking into account the relevant ecological and economic factors, the current treatment of landfill leachate is mainly based on reverse osmosis membrane filtration + evaporation, leaving 20%-30% of the raw liquid mass as membrane concentrate and / or evaporation mother liquor. Membrane concentrate after membrane treatment, the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/04
CPCC04B28/04C04B2111/00784C04B2201/50C04B2201/05C04B18/141C04B18/08C04B22/064C04B22/147C04B24/04C04B24/38C04B14/08C04B22/145C04B22/148C04B22/0046C04B18/146C04B22/10C04B14/104C04B22/143C04B18/12C04B2103/0051C04B22/142
Inventor 谢炜炫王舒东胡根福赵勇温联河曾志群
Owner XIAMEN JIARONG TECH CO LTD
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