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Sludge treating and utilizing method for reducing heavy metal in sludge discharged in soil

A sludge treatment and heavy metal technology, which is applied in water/sludge/sewage treatment, sludge treatment, chemical instruments and methods, etc., can solve problems such as polluting agricultural soil, improve plant yield, simplify collection, improve effect of structure

Inactive Publication Date: 2010-08-04
SOUTH CHINA AGRI UNIV
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Problems solved by technology

The invention solves the problem of agricultural soil pollution by heavy metals in the process of agricultural utilization of urban sludge by fixing sludge residues and heavy metals, allowing nutrient-rich fertilizer water to flow out for crops to absorb

Method used

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  • Sludge treating and utilizing method for reducing heavy metal in sludge discharged in soil
  • Sludge treating and utilizing method for reducing heavy metal in sludge discharged in soil
  • Sludge treating and utilizing method for reducing heavy metal in sludge discharged in soil

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Embodiment Construction

[0012] The following examples are used to further illustrate the present invention, but do not limit the protection scope of the present invention.

[0013] Remove the upper part of the discarded plastic bottle, make it into a cylinder, and drill 10 small holes with a diameter of 1 cm evenly around the circumference of 1 cm from the bottom to facilitate the release of nutrients in the sludge. Fresh dewatered sludge (about 80% water content) is mixed with heavy metal fixative: fly ash, lime, potassium sulfate respectively, and its proportion is to add 5-15g fixative per Kg of dry sludge to obtain 3 parts mixture. The soil is then placed in a plastic bottle and the bottle is placed on the soil where the plants grow. Its working principle is: sludge is stored in plastic containers, nutrients flow into the soil through small holes, while heavy metals are fixed and retained in the container, which is convenient for collection and reprocessing to prevent secondary pollution.

[00...

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Abstract

The invention discloses a sludge treating and utilizing method for reducing heavy metal in sludge discharged in soil, which takes flyash, potassium sulphate or lime as a fixing agent of heavy metal in the sludge and comprises the following steps: mixing the fixing agent with the sludge, placing the mixture on soil implanted with plants by a proper method, enabling fertilizers in the sludge to flow in the soil implanted with plants by manual water pouring or natural rainfall, and recovering residue and the heavy metal in the sludge. The method provided by the invention is simple and feasible, has low cost, improves sludge structure, replenishes parts of nutrient elements for the soil, reduces heavy metal shift to the soil, and realizes the environment-friendly target of changing waste into wealth and multipurpose use.

Description

technical field [0001] The invention relates to solid waste treatment and agricultural utilization, in particular to a sludge treatment and utilization method for reducing the discharge of heavy metals in the sludge into soil. Background technique [0002] With the development of my country's urban economy and the increase of population, sewage plants discharge about 5.5 to 6 million tons of dry sludge every year, and show a significant growth trend, resulting in serious environmental pollution. Nowadays, the popularization of sewage treatment facilities, the improvement of treatment capacity and the deepening of treatment level have increased the generation of sludge. How to properly dispose of urban sludge and solve its outlet has become a very urgent task. The composition of urban sludge is relatively complex. It is rich in N, P and organic matter (better than pig and cow dung). It is a good source of organic fertilizer, which can be used rationally in agriculture to redu...

Claims

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Application Information

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IPC IPC(8): C02F11/00C02F101/20
Inventor 吴启堂许田芬卫泽斌吕艳荷黑亮
Owner SOUTH CHINA AGRI UNIV
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