A kind of method of repairing nitrobenzene polluted soil

A technology of polluted soil and nitrobenzene, which is applied in the field of contaminated soil remediation, can solve the problems that the huge potential of pollutant degradation has not been fully explored, the treatment capacity of high-concentration pollutants is limited, and the construction of efficient bacteria is difficult. Remarkable removal effect, low operating cost, and reasonable design of process steps

Active Publication Date: 2020-08-21
BEIJING GEOENVIRON ENG & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At home and abroad, relatively mature biological bacterial agent products have been put into the market, but similar products are all exogenous strains, and the composition of the strains is relatively simple, and the adaptability to specific soil environments is poor, and it is difficult to become the dominant strain in the soil. Long-term continuous dosing is required, and the separation and construction of high-efficiency bacteria is difficult, and the research and development cycle is long. Therefore, most of the bacterial agent products are expensive and the operating cost is high, and the dosing of exogenous bacteria may also be due to differences with indigenous bacteria. Biosecurity concerns due to overlapping niches
In addition, relying on current biotechnology, only about 1% of the bacteria in nature can be isolated, and most of the bacteria cannot be isolated. Therefore, the huge potential of indigenous microorganisms in the ecological environment to degrade pollutants has not yet been fully explored.
[0005] The single bioremediation method also has obvious limitations, such as long repair period, limited ability to deal with high-concentration pollutants, etc.

Method used

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  • A kind of method of repairing nitrobenzene polluted soil
  • A kind of method of repairing nitrobenzene polluted soil

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0076] Soil remediation of a nitrobenzene-contaminated plot.

[0077] In the former site of a chemical factory, the pollutant in the soil is nitrobenzene, and the amount of polluted soil is 2400m 3 , the highest pollution concentration is 465mg / kg, using this process for soil remediation, the specific implementation is as follows:

[0078] The same amount of soil samples were collected at the points where the pollution concentration of the site was around 400mg / kg, 260mg / kg, and 120mg / kg respectively, and a total of 2t was collected.

[0079] The effective volume is 1000m 3 The pool is equipped with aeration facilities as a culture container, according to NH 4 NO 3 10 copies, K 2 HPO 4 5 parts, KH 2 PO 4 5 parts, CaCl 2 1 part, NaCl 2 parts, MgSO 4 1 part, MnSO 4 0.1 parts, FeSO 4 Weigh 1t of basic inorganic salt medium at a ratio of 0.1, put it into a pool and add water until the effective volume is completely dissolved, add 1t of inorganic carrier zeolite po...

Embodiment 2

[0088] Soil remediation of a plot contaminated with nitrochlorobenzene.

[0089] A nitrochlorobenzene leakage accident occurred in a plot. After pre-treatment, the concentration of nitrochlorobenzene in the soil still reached above 1300mg / L, and the amount of contaminated soil was 300m 3 , using this process for soil remediation, the specific implementation is as follows:

[0090] The same amount of soil samples were collected at the points where the pollution concentration of the site was around 1300mg / kg, 800mg / kg, and 450mg / kg respectively, and a total of 2t was collected.

[0091] The effective volume is 200m 3 The pool is equipped with aeration facilities as a culture container, according to NH 4 NO 3 8 copies, K 2 HPO 4 6 parts, KH 2 PO 4 4 parts, CaCl 2 1.2 parts, NaCl 1.5 parts, MgSO 4 1.2 parts, MnSO 4 0.05 parts, FeSO 4 Weigh 2t of the basic inorganic salt medium at a ratio of 0.15, put it into the pool and add water until the effective volume is co...

Embodiment 3

[0100] Soil remediation of a compound-contaminated plot of nitrophenol and nitroaniline.

[0101] The former site of a chemical factory, the soil was polluted by nitrophenol and nitroaniline, the maximum pollution concentration reached 628mg / L, and the polluted soil volume was about 1000m 3 , using this process for soil remediation, the specific implementation is as follows:

[0102] The same amount of soil samples were collected at the points where the pollution concentration of the site was around 600mg / kg, 350mg / kg, and 120mg / kg respectively, and a total of 1.6t was collected.

[0103] The effective volume is 400m 3 The pool is equipped with aeration facilities as a culture container, according to NH 4 NO 3 12 copies, K 2 HPO 4 4 parts, KH 2 PO 4 6 parts, CaCl 2 0.8 parts, NaCl 2.5 parts, MgSO 4 0.8 parts, MnSO 4 0.15 parts, FeSO 4 Weigh 2t of the basic inorganic salt medium at a ratio of 0.05 parts, put it into the pool and add water until the effective vo...

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Abstract

The invention relates to the technical field of contaminated soil remediation, in particular to a method for repairing nitrobenzene contaminated soil. The method comprises the following steps: carrying out in situ leaching and carrying out in situ remediation by using functional flora obtained by indigenous microorganism culture; a culture solution for indigenous microorganisms is prepared from aninducing substrate which is prepared from one or a combination of two of phenol and catechol. By synergizing in situ leaching with the indigenous microorganisms to perform enhanced repair on the nitrobenzene contaminated soil, the method has the advantages of obvious removing effect, fast-onset, stable and lasting effects, no need of long-term continuous addition, reasonable process, low cost, easiness in promotion and implementation as well as good environmental benefits, economic benefits and social benefits.

Description

technical field [0001] The invention relates to the technical field of contaminated soil remediation, in particular to a method for remediating nitrobenzene-contaminated soil. Background technique [0002] Nitrobenzene is an important chemical raw material, widely used in national defense, printing and dyeing, plastics, pesticides, medicine and other fields. With the acceleration of industrialization, more and more nitrobenzene substances enter the soil and groundwater along with industrial wastewater and waste residue. Nitrobenzene substances can be absorbed by the human body through the skin and respiratory tract, causing poisoning and even death, posing a serious threat to human health and the ecological environment. Many of these compounds have been listed as priority pollutants by the US Environmental Protection Agency (EPA). At present, the remediation methods of nitrobenzene-contaminated soil mainly include chemical reduction, chemical oxidation, thermal desorption, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B09C1/10B09C1/02
CPCB09C1/02B09C1/10B09C2101/00
Inventor 吕正勇朱湖地秦森苗竹李淑彩范吉强宋登慧郭明达
Owner BEIJING GEOENVIRON ENG & TECH
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