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Combined process for ex-situ remediation of degradation-resistant organic contaminated soil by microorganisms

A technology of polluted soil and combined process, which is applied in the process field of repairing organic polluted soil, can solve problems such as heavy workload, inability to provide environmental conditions for microbial growth and metabolism, and inability to evenly distribute and stack piles of rotting pools, etc., so as to reduce treatment costs, The effect of avoiding secondary pollution

Inactive Publication Date: 2014-04-02
CHENGDU EN SHAIN TECH INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the method of this patent, solid bacterial agents are used as the organic pollutants in the degraded contaminated soil. The preparation method of the solid bacterial agents disclosed in the specification is complicated and the workload is relatively large; while the facility structure design of the shed-like structure in the disclosed facilities The method is not reasonable enough. For the pre-remediation contaminated soil, it cannot be evenly distributed and stacked in the compost tank; this process cannot provide the most suitable environmental conditions for microbial growth and metabolism, and cannot well control temperature, air, pH, etc. Not enough to maximize the degradation rate

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Example 1: This example is to repair soil contaminated by dichlorobiphenyl with a concentration of 1000 ppm. Desulfitobacterium High-efficiency anaerobic degradation bacteria and green manure, the number of high-efficiency anaerobic degradation bacteria accounted for 1.5% of the volume of the contaminated soil, so that C:N:P:K=1650:13:3:1.5 in the total nutrients, the contaminated soil will be turned into organisms Pile and compact the mound, then cover it with multi-layer geomembrane, and control the temperature at 40~55℃. After 2 months of treatment, when the dichlorobiphenyl drops to 350-500ppm, the concentration of pollutants cannot continue to drop rapidly, so aerobic treatment is changed. Aerobic process, first adjust the pH to 7.2, add S.chlorophenolica or Acinetobacter High-efficiency aerobic degradation bacteria and nutrients, while adding the corresponding co-metabolism substrate-molasses discarded from sugar factories, the number of high-efficiency aerobic d...

Embodiment 2

[0017] Embodiment 2: This embodiment is to repair the soil contaminated by o-(p-)dinitrochlorobenzene with a concentration of 5000 ppm. Join first Clitrobacter frenmdii High-efficiency anaerobic degradation bacteria and biogas residue, the number of high-efficiency anaerobic degradation bacteria accounts for 1% of the volume of the contaminated soil, so that C:N:P:K=1300:7:2:0.75 in the total nutrients will build the contaminated soil Biopile, compact the mound, and then cover it with multi-layer geomembrane at a temperature of 45-60℃. After 5 months of treatment, when the o-(p-)dinitrochlorobenzene drops to 2200-2600ppm, the concentration of pollutants cannot continue to drop rapidly, so it is changed to aerobic treatment. First, adjust the pH to 7 and add Pseudomonas sp. High-efficiency aerobic degradation bacteria and nutrients. The number of high-efficiency aerobic degradation bacteria accounts for 0.7% of the total volume of contaminated soil. At the same time, the corres...

Embodiment 3

[0018] Example 3: This example is to remediate soil contaminated by DDTs with a concentration of 2000ppm. First add Proteus vulgaris High-efficiency anaerobic degrading bacteria and mature animal feces, the number of high-efficiency anaerobic degrading bacteria accounted for 1.2% of the volume of contaminated soil, so that C:N:P:K=1200:8:2.3:0.8 in the total nutrients, to build a biopile , The mound is compacted, and then covered with multiple layers of geomembrane, the temperature is 50~60℃. After 3 months of treatment, when DDT dropped to 1220-1350ppm, the concentration of pollutants could not continue to drop rapidly, and changed to aerobic treatment. First, adjust the pH to 7.4 and add Alcaligeness The number of high-efficiency aerobic degradation bacteria and nutrients, the number of high-efficiency aerobic degradation bacteria accounted for 0.75% of the total volume of contaminated soil, while adding the corresponding co-metabolism substrate-sugar mill waste molasses, to...

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Abstract

The invention relates to a contaminated soil repair process, and particularly relates to a combined process for ex-situ remediation of degradation-resistant organic contaminated soil by microorganisms. The process comprises the following steps: first, carrying out an anaerobic process, namely adding efficient anaerobic degrading bacteria and nutritional matters, wherein C:N:P:K=(1,200-2,000):(5-15):(0.5-5):(0.2-2) in the nutritional matters, and the temperature is controlled at 40-60 DEG C; after treating for 2-5 months, carrying out aerobic treatment when concentration of the contaminated soil meets the demand; and adjusting the PH to 7-7.5, adding efficient anaerobic degrading bacteria, nutritional matters and corresponding co-metabolic primers, wherein C:N:P:K=(80-140):(7-15):(0.5-5):(0.2-1.5) in the nutritional matters, and the temperature is controlled at 10-40 DEG C; and treating for 2-5 months again till the total degradation rate reaches over 90%. The process provided by the invention avoids secondary pollution on the environment, and the degradation rate reaches up to over 96%.

Description

Technical field [0001] The invention relates to a process for repairing organic contaminated soil, in particular to a combined process for repairing difficult-to-degrade organic contaminated soil by microorganisms ex-situ. Background technique [0002] At present, in the production and manufacturing industries, such as chemical industry, coking, pharmacy, pigment synthesis, wood preservatives, plastic manufacturing, herbicide manufacturing, mineral industry, etc., a large number of organic pollutants containing toxic chemicals are generated. These organic pollutions The materials have also seriously polluted the soil. With the rapid development of industrialization and urbanization in my country, a large number of industrially polluted sites have been left behind by the shutdown and relocation of polluting enterprises. In addition, the policies of “retreating two into three” and “retreating from the city to enter the garden” implemented by the state have led to a large number of...

Claims

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Application Information

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IPC IPC(8): B09C1/10
Inventor 雷继雨李建洲
Owner CHENGDU EN SHAIN TECH INC
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