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Method of restoring contaminated land

A technology of polluted land and land, applied in the restoration of polluted soil, chemical instruments and methods, soil conditioning materials, etc., can solve the problems of rainwater immersion, clay drying, cracking, etc., and achieve the effect of improving the environment

Inactive Publication Date: 2013-04-10
LICHEN PROPERTIES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, many landfills that already exist do not benefit from such linings
Also, attempts to cover landfills with clay to prevent water ingress are often unsuccessful because over time the clay dries out and cracks, allowing rainwater to infiltrate

Method used

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  • Method of restoring contaminated land

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Embodiment Construction

[0017] refer to figure 1 , the section of the covered landfill is shown in Figure 10. Landfills 10 include stored waste or landfills 12, which are typically collected by local municipal authorities and transported to landfills for long-term storage. As previously mentioned, if this waste 12 is not treated as described below, it will pollute the environment.

[0018] A pozzolanic layer or hard rock 14 is laid over the waste 12 . The pozzolanic pan is made of pulverized fly ash (PFA) mixed with lime. PFA is a waste from coal-fired power plants. Over time, PFA distributed in the form of free lime forms an impermeable volcanic rock formation. The rock effectively covers the waste 12, preventing by-products of the biodegradation process, such as methane and carbon dioxide gas, from rising to the surface. It also provides a barrier against ingress of rain and / or groundwater. The thickness of the pozzolanic layer is about 1m to 1.5m.

[0019] Although not shown in the figure ...

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Abstract

A method of restoring contaminated land, for example landfill (12), comprises covering the surface of the land with a substantially uninterrupted layer of a composition including pulverised fly ash mixed with lime, the preparation creating a pozzolanic pan (14). At least one soil horizon comprising varying mixtures of pulverised fly ash, biochar and secondary treated sewage sludge or other organic material is laid over the pozzolanic pan (14).

Description

technical field [0001] The invention relates to a method for repairing polluted land, which is especially suitable for but not limited to landfills. Background technique [0002] Currently, the re-use of contaminated land, for example for new buildings, roads, residential and commercial orchards, vineyards, gardens and sports fields, is of limited practicality because the pollution can be long-term toxic and thus harmful to health and Security poses a significant risk. Additionally, pollution may prevent or limit plant growth. [0003] In former landfills, landfilled waste typically produces one or more gases as by-products of natural degradation, depending on the age of the site and the type of landfilled waste. These gases, especially the emissions of so-called "greenhouse gases" such as methane and carbon dioxide, are harmful to the environment. [0004] In addition, rainwater seeps through landfills and becomes contaminated with decomposed waste to form leachate. Thi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C05F11/02B09C1/00
CPCB09B1/004C05F11/02C09K17/40Y02E50/30Y02W30/30Y02W30/40B09C1/00C09K17/06C09K17/10E02D31/006B09B3/25B09C1/08
Inventor Q·C·理查兹
Owner LICHEN PROPERTIES
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