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Lime drying sludge stabilizer of heavy metal compound contaminated soil and application method thereof

A technology for drying sludge and compound pollution, which is applied in the field of ecological environment management to achieve the effects of obvious physical properties, improved physical properties, and reduced leachable components

Active Publication Date: 2014-06-11
ENVIRONMENTAL PROTECTION RES INST OF LIGHT IND
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0010] Aiming at the defect that a single stabilizer has a selective effect on the stabilization of heavy metals in the existing in-situ remediation technology of heavy metal-contaminated soil, the purpose of the present invention is to provide a lime-dried sludge stabilizer for heavy metal-contaminated soil and its Instructions

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  • Lime drying sludge stabilizer of heavy metal compound contaminated soil and application method thereof
  • Lime drying sludge stabilizer of heavy metal compound contaminated soil and application method thereof

Examples

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Effect test

Embodiment 1

[0034] Example 1 Handling of artificially prepared heavy metal compound polluted soil and planting crops

[0035] The artificially prepared heavy metal compound polluted soil was used as the test material, which was the natural soil from the Huangyuan quarry in Zhoukoudian Town, Fangshan District, Beijing, and added Pb(Ac) 2 ·3H 2 O, ZnSO 4 ·7H 2 O and CdCl 2 2.5H 2 The aqueous solution of O was prepared by mixing in soil, air-drying, grinding and mixing. The amount of the heavy metal aqueous solution is calculated by the weight of the heavy metal salt, and the specific addition amount is m(CdCl 2 2.5H 2 O)=0.10157g / kg soil, m(ZnSO 4 ·7H 2 O)=83.92338g / kg soil, m(Pb(Ac) 2 ·3H 2 O)=45.76637g / kg soil.

[0036] Firstly, the artificially prepared heavy metal complex polluted soil was crushed, and the particle size was controlled to be ≤2cm. After crushing, it was evenly spread in the field, and the thickness of the tile was 25cm.

[0037] Sprinkle stabilizer evenly on ...

Embodiment 2

[0049] Example 2 Treating heavy metal compound polluted soil in Jiahe County, Hunan Province and planting crops

[0050] Firstly, the heavy metal compound polluted soil in the lead-zinc mining area of ​​Jiahe County, Hunan Province was crushed, and the particle size was controlled to be ≤2cm.

[0051] Sprinkle stabilizer evenly on above-mentioned soil, described stabilizer comprises lime dried sludge and ferrous sulfate, described lime dried sludge (taken from Beijing Xiaohongmen Sewage Treatment Plant, this plant adopts lime treatment process Reduce the moisture content of the dewatered sludge and stabilize the sterilization. The lime drying sludge obtained after the lime dehydration treatment of the sludge in the secondary sedimentation tank of the sewage treatment plant is used in the present invention. After crushing, the particle size is ≤ 2cm) and ferrous sulfate (purchased from Shijiazhuang Zijin Copper Industry Co., Ltd., Fe≥30.0%) with a mass ratio of 10:3, and 20 par...

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Abstract

The invention discloses a lime drying sludge stabilizer of heavy metal compound contaminated soil. The lime drying sludge stabilizer is prepared from the following components in parts by weight: 10 parts of lime drying sludge, and 2-3 parts of ferrous sulfate. The invention also provides an application method of the lime drying sludge stabilizer. The method concretely comprises the following steps: 1) paving the heavy metal compound contaminated soil on flat ground after crushing; 2) scattering the lime drying sludge stabilizer on the heavy metal compound contaminated soil; 3) carrying out rotary cultivation for the first time; 4) carrying out alternation of wetting and drying for 15 days, and carrying out rotary cultivation for the second time to obtain stabilized soil; 5) doping straw according to the volume ratio, and carrying out rotary cultivation for the third time, so as to obtain the tillable repaired soil. The invention also provides application of the lime drying sludge stabilizer of the heavy metal compound contaminated soil and the application method thereof in soil heavy metal pollution control. The invention also provides application of repaired soil obtained by using the application method of the lime drying sludge stabilizer in crop planting. The soil processed by the method is significant in heavy metal stabilization effect.

Description

technical field [0001] The invention belongs to the field of ecological environment treatment, and in particular relates to a lime-dried sludge stabilizer for heavy metal compound polluted soil and a use method thereof. Background technique [0002] At present, the remediation of heavy metal soil pollution mainly adopts physical methods, chemical methods and phytoremediation methods. Whether it is physical chemical remediation or plant or microbial remediation, it can be summarized into two types in terms of mechanism: one is to change the existing form of heavy metals in the soil, so that it changes from an active state to a stable state, thereby reducing its mobility and property in the environment. Bioavailability; the second is to remove heavy metals from the soil so that their remaining concentrations are close to or reach the background value. Commonly used heavy metal contaminated soil remediation technologies mainly include excavation, stabilization / solidification (...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K17/40C09K101/00
Inventor 李翔宋云刘永兵贾斌程言君
Owner ENVIRONMENTAL PROTECTION RES INST OF LIGHT IND
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