Method for co-processing arsenic-containing sludge and lake sediment

A co-processing and bottom sludge technology, which is applied in sludge treatment, chemical instruments and methods, water/sludge/sewage treatment, etc., can solve the problems of secondary pollution of arsenic-containing sludge environment, solve the solidification problem, realize Effect of secondary utilization and reduction of production cost

Inactive Publication Date: 2017-07-07
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The invention not only solves the storage problem of lake sediment, but also solves the problem of solidification of arsenic-containing sludge and the problem of secondary pollution to the environment

Method used

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  • Method for co-processing arsenic-containing sludge and lake sediment
  • Method for co-processing arsenic-containing sludge and lake sediment

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] The method for the co-processing of arsenic-containing sludge in the lake sediment, the specific steps are as follows:

[0019] (1) Pretreatment: First, control the moisture content of the arsenic-containing sludge (composition shown in Table 1) obtained after the arsenic-acid-containing wastewater lime-iron-salt treatment to 2 and Al 2 o 3 For lake sediments with a total content >50% (the composition is shown in Table 2), control the water content >50%;

[0020] Table 1 Composition of arsenic-containing sludge

[0021]

[0022] Table 2 The composition of lake sediment

[0023]

[0024] (2) Synergistic treatment: First, the arsenic-containing sludge, lake sediment, cement, lime, activator and admixture obtained through the pretreatment of step (1) are ball milled according to the mass ratio of 49:30:8:8:3:2 Mix evenly to obtain a dry basis, and the sum of the content percentages of the above components is equal to 100%; wherein the activator is water glass, and...

Embodiment 2

[0028] The method for the co-processing of arsenic-containing sludge in the lake sediment, the specific steps are as follows:

[0029] (1) Pretreatment: First, control the moisture content of the arsenic-containing sludge (composition shown in Table 1) obtained after the arsenic-acid-containing wastewater lime-iron-salt treatment to 2 and Al 2 o 3 For lake sediments with a total content >50% (the composition is shown in Table 2), control the water content >50%;

[0030] (2) Synergistic treatment: First, the arsenic-containing sludge, lake sediment, cement, lime, activator and admixture obtained through the pretreatment of step (1) are ball milled according to the mass ratio of 40:35:9:10:4:2 Mix evenly to obtain a dry basis, and the sum of the content percentages of the above components is equal to 100%; wherein the activator is water glass, and the admixture is silica fume;

[0031] (3) Curing: Add 8% water to the dry base obtained in step (2) and stir evenly, and then pres...

Embodiment 3

[0034] The method for the co-processing of arsenic-containing sludge in the lake sediment, the specific steps are as follows:

[0035] (1) Pretreatment: First, control the moisture content of the arsenic-containing sludge (composition shown in Table 1) obtained after the arsenic-acid-containing wastewater lime-iron-salt treatment to 2 and Al 2 o 3 For lake sediments with a total content >50% (the composition is shown in Table 2), control the water content >50%;

[0036] (2) Synergistic treatment: First, the arsenic-containing sludge, lake sediment, cement, lime, activator and admixture obtained through the pretreatment of step (1) are ball milled according to the mass ratio of 60:20:5:12:2:1 Mix evenly to obtain a dry basis, and the sum of the content percentages of the above components is equal to 100%; wherein the activator is water glass, and the admixture is silica fume;

[0037] (3) Curing: Add 16% water to the dry base obtained in step (2) and stir evenly, and then pre...

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Abstract

The invention relates to a method for co-processing arsenic-containing sludge and lake sediment and belongs to the technical field of solid waste resource utilization in environmental engineering. The method comprises the following steps: firstly, controlling the moisture content of the acquired arsenic-containing sludge to be below 15% after treating the arsenic acid wastewater and lime according to a ferric salt method; controlling the moisture content of the lake sediment containing more than 50% of SiO2 and Al2O3 in dry weight to be above 50%; ball-milling and uniformly mixing the pre-processed arsenic-containing sludge, lake sediment, cement, lime, excitant and additive, thereby acquiring a dry base; adding water into the acquired dry base, uniformly stirring and then pressing into a cured building block; placing the cured building block and standing by for 4-6h; maintaining for 6-12h under 0.8-2.0Mpa steam pressure; safely storing the standard cured building block or applying to industrial buildings. The method provided by the invention not only can solve the problem of stockpiling of the lake sediment but also can solve the problem of curing of the arsenic-containing sludge and the problem of secondary pollution to the environment.

Description

technical field [0001] The invention relates to a method for co-processing arsenic-containing sludge with lake bottom mud, and belongs to the technical field of resource utilization of solid waste in environmental engineering. Background technique [0002] At present, in the face of the increasing pollution of lakes, many countries, regions and governments have adopted different methods to deal with polluted lakes. This method is all about treating the symptoms rather than the root cause, which not only consumes a lot of manpower and material resources, but also makes the pollution more and more serious. Use clean water to replace polluted water, and the silt at the bottom of the lake will become a secondary pollution source, releasing pollutants and polluting the clean water; the sludge excavated by dredging and dredging is either discarded or landfilled. The sludge often contains germs and excessive heavy metals, and a large amount of sludge that has not undergone harmles...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F11/12C02F11/00C04B28/10C02F101/10C02F101/20
CPCC02F11/008C02F11/12C02F2101/103C02F2101/20C04B28/10C04B18/0418C04B7/00C04B12/04C04B18/146
Inventor 王华李勇祝星祁先进徐媛韦龙华李勋
Owner KUNMING UNIV OF SCI & TECH
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