Microbe stabilization solidification restoration method of chromium-contaminated soil

A chromium-contaminated soil and repair method technology, applied in the field of environmental protection, can solve the problems of reducing agent consumption, large power consumption, and high cost of chemical cleaning methods, and achieve the effects of reducing toxicity, low price, and environmental friendliness

Inactive Publication Date: 2014-08-13
苏州市环境科学研究所 +2
View PDF3 Cites 20 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the commonly used treatment methods for chromium-contaminated sites include: chemical reduction, chemical cleaning, electric repair and other technologies. It is easy to convert into hexavalent chromium again; the cost of chemical cleaning is extremely high, and it is difficult to be popularized and applied; electric repair technology consumes a lot of electricity, and the repair effect is not ideal

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Example 1: A microbial stabilization and solidification repair method for chromium-contaminated soil

[0018] This embodiment selects the chromium-contaminated soil of Suzhou Specialty Chemicals Co., Ltd., and detects it by using HJ491-2009 "Determination of Total Chromium in Soil by Flame Atomic Absorption Spectrophotometry". The total chromium concentration in the soil of this plot is 4670mg / kg , the determination of hexavalent chromium refers to the "solid waste?? Hexavalent chromium analysis sample pretreatment? Alkaline digestion method" (GB5085.3-200) for sample pretreatment, and then through the "solid waste hexavalent chromium determination diphenyl Carbohydrazide spectrophotometry" (GB / T15555.4-1995) was used to measure the concentration of hexavalent chromium in the filtrate and convert it to the total concentration of hexavalent chromium in the soil. The concentration of hexavalent chromium in the soil in this area is 964mg / kg.

[0019] Treatment method: Inc...

Embodiment 2

[0026] Example 2: A microbial stabilization and solidification repair method for chromium-contaminated soil

[0027] In this example, the source of polluted soil, operation steps and related measurement methods are the same as in Example 1, the difference is that in step (3), 100ml of ethyl lactate solution is added, which accounts for 5% of the chromium-contaminated soil, and cultured at 28°C After 60 days, the remaining concentration of hexavalent chromium in the soil was 21.5mg / kg, the concentration of hexavalent chromium in the leaching solution was 0.26mg / L, the concentration of total chromium was 0.63mg / L, and the concentration of hexavalent chromium in the leaching solution after oxidation of potassium permanganate It was 2.68 mg / L. The above aqueous ethyl lactate solution also contained 0.3 glucose.

Embodiment 3

[0028] Example 3: A microbial stabilization and solidification repair method for chromium-contaminated soil

[0029] In this example, the source of the polluted soil, operation steps and related measurement methods are the same as in Example 1, the difference is that in step (3), 200ml of ethyl lactate solution is added, accounting for 10% of the chromium-contaminated soil, and cultured at 28°C After 60 days, the remaining concentration of hexavalent chromium in the soil is 28.5 mg / kg, the concentration of hexavalent chromium in the leach solution is 0.20 mg / L, and the concentration of total chromium is lower than 0.43 mg / L. The concentration is 1.95 mg / L. Also contain 0.5% surfactant in the above-mentioned ethyl lactate aqueous solution.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

A method comprises the following steps: Step 1, mixing chromium-contaminated soil and lime sulphur and uniformly stirring to carry out a reaction so as to reduce the content of hexavalent chromium in the chromium-contaminated soil to less than 200mg / kg to obtain restored soil, wherein the mass ratio of hexavalent chromium in the chromium-contaminated soil to lime sulphur is 1:1-5; and Step 2, adding an aqueous solution of ethyl lactate into the stored soil obtained from the Step 1, uniformly stirring, culturing for 50 days or more so as to obtain restored soil, wherein 10-200 ml of the aqueous solution of ethyl lactate is added into 1 kg of the restored soil; and mass concentration of the aqueous solution of ethyl lactate is 1%. The restoration method has low cost and is environmentally friendly. By the restoration method, defects that technologies such as a traditional chemical reduction method, a chemical cleaning method and the like have high cost and are easy to produce secondary pollution are overcome.

Description

technical field [0001] The invention relates to a microbial stabilization and solidification restoration method for chromium-contaminated soil, which belongs to the technical field of environmental protection. Background technique [0002] Chromium salt is one of the main series of inorganic chemical products in my country. It is widely used in industries such as metallurgy, tanning, pigments, dyes, spices, metal surface treatment, wood preservation, and military industry. It is listed as the eight most competitive resources. One of the raw material products. my country is the main producer of chromium salts, with an annual output of about 400,000 tons and an annual increase of 10%, accounting for about 40% of the world's output. In my country, chromium salts are mainly produced by roasting with calcium. Usually, 2.5 to 3 tons of chromium slag will be discharged for every ton of chromium salt produced. The accumulation of a large amount of chromium slag will lead to chromium...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
Patent Type & Authority Applications(China)
IPC IPC(8): B09C1/10
Inventor 张建荣郑家传许伟沈帧夏婷婷施维林王永强辜晓平
Owner 苏州市环境科学研究所
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap