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Lining material for garbage burying field

A landfill and layered material technology, applied in the field of modified bentonite materials, can solve the problems of ineffective adsorption, inability to prevent the migration of organic pollutants, and extravasation of organic pollutants, and achieve good economic benefits and social benefits. Benefit, increase adsorption capacity, improve the effect of adsorption capacity

Inactive Publication Date: 2003-10-15
鲁安怀
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But in fact, in some landfills built with natural soft layers in the past, it has been found that the organic pollutants in the site have seepage phenomenon, which is closely related to the excessive organic matter components in municipal solid waste.
Because the inorganic clay mineral soft layer has strong hydrophilicity and cannot effectively absorb hydrophobic organic pollutants, it cannot achieve the purpose of preventing the migration of organic pollutants and preventing the leakage of organic pollutants

Method used

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  • Lining material for garbage burying field
  • Lining material for garbage burying field

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0023] This example is the preparation of organic bentonite.

[0024] The natural bentonite used in the experiment is natural calcium-based bentonite from Xuanhua, Hebei. The main mineral components are: bentonite 87.4%, quartz 3.6%, α-cristobalite 7.3%, potassium feldspar 0.7%, and other 1.0%. The cation exchange capacity is 83.87mlg / 100g soil, its chemical composition is shown in Table 1; Used modifying agent is chemically pure cetyltrimethylamine bromide (CTMAB).

[0025] Preparation:

[0026] Pass through a 100-mesh sieve after drying as it is and place it in a jar for later use. Weigh 40g of the original sample for each experiment, pour it into 200ml of a certain concentration of CTMAB solution, shake it well, put it into a constant temperature oscillator for 2.5h at a constant temperature, the temperature is 50°C, and the vibration speed is 170r·min -1 . Take it out, filter and wash it until there is no bromide ion, dry it at about 90°C, grind it and pass it through ...

example 2

[0032] This example is the preparation of metal bentonite.

[0033] through Na + , Ca 2+ 、Cu 2+ and Cr 3+ Saturated bentonite (raw material is with example 1) carries out X-ray analysis, and its bottom surface reflection d 001 The value of surface mesh spacing is shown in Table 3, that is, the order of the layer spacing of these kinds of bentonites from small to large is Na + 2+ 2+ al 3+ 3+ The larger interlayer distance of bentonite is conducive to the entry of organic molecules into the interlayer of bentonite.

[0034] Containing Na + , Ca 2+ 、Cu 2+ al 3+ and Cr 3+ The chemical analysis of bentonite, which contains CaO, Na 2 O, CuO, Al 2 o 3 、Cr 2 o 3 and the mass percentage of adsorbed water are shown in Table 4. It can be seen from Table 4 that more water molecules surround the high-valence cations, and these water molecules can form hydrogen bonds with hydroxyl organic molecules, thereby absorbing a larger amount of organic matter.

example 3

[0036] This example is the adsorption experiment of organic bentonite on phenol, aniline, benzene series and chloroform.

[0037] 1. Organobentonite adsorption of phenol experiment

[0038] Experimental conditions: The initial concentration of phenol is 10mg / 1, the amount of bentonite is 2.5g, and the adsorption experiment is carried out. The experimental process is to shake at a constant temperature for 10 minutes at a vibration speed of 150r / min at room temperature, centrifuge, pass through the membrane, and measure the remaining concentration. The same below. The results are shown in Table 5, which shows that with the increase of the amount of modifier, the adsorption capacity of organobentonite to phenol is enhanced.

[0039] 2. Organobentonite adsorption of aniline experiment

[0040] Experimental conditions: organic bentonite dosage 2.0g, solution volume 25ml, initial concentration of aniline 20mg / l, neutral pH value, removal rate of aniline up to 90%, and equilibrium...

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Abstract

The lining material for garbage-burying field features by blending the organic, metal and natural bentonites together to construct the laminar lining material. The invented material has strong absorption ability to the organic pollutants such as carbolic acid, aniline, benzol series material and halocarbon containing in the percolating liquid of the garbage so that it can prevent the leakage of organic pollutants so as to protect underground water from pollution.

Description

technical field [0001] The present invention belongs to clay materials for producing layered products, more specifically a modified bentonite material for landfill liners and wall structures. Background technique [0002] In recent years, with the high concentration of population and the rapid development of urbanization, the garbage in all countries in the world is growing at an average rate three times faster than their economic growth rate, and the huge amount of garbage is increasingly seriously affecting human existence. The problem of urban waste disposal has become increasingly prominent. Today, both developed and developing countries are inevitably facing the serious threat of waste and harm of natural resources. There have been accidents of garbage dumps polluting drinking water both at home and abroad. Currently, municipal waste disposal methods generally include sanitary landfill, open stacking, incineration, pyrolysis, biodegradation, composting, and throwing i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B32B13/00B32B19/00E02D31/00
Inventor 鲁安怀韩丽荣张佥郑红
Owner 鲁安怀
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