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Spiral stirring type bioreactor and method for repairing soil with organic contamination

A bioreactor and screw stirring technology is applied in the field of bioremediation of organic polluted soil, which can solve the problems of limited remediation efficiency, complex process and high cost, and achieve the effects of high solid-liquid separation efficiency, improved treatment efficiency and improved environmental conditions.

Pending Publication Date: 2021-02-26
GUANGXI BOSSCO ENVIRONMENTAL PROTECTION TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, when bioreactors are used to remediate organically polluted soils, organic pollutants are tightly adsorbed on the surface of soil particles and even occupy a small portion of soil pores due to the finer particles of cohesive soil, large specific surface area, and high content of strongly bound water between fine particles. , and most of the microorganisms exist in the water phase of the soil, so it is difficult for microorganisms to come into contact with pollutants to effectively biodegrade
At the same time, organic pollutants are highly hydrophobic, and the use of clean water alone cannot effectively promote the desorption and transfer of pollutants from soil particles, resulting in limited contact area between pollutants and microorganisms, and limited remediation efficiency. It usually takes 2 to 3 months. maintenance time
Therefore, when bioreactor technology is used to remediate organically polluted soil, there are defects such as long remediation time, complicated process, and high cost.

Method used

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  • Spiral stirring type bioreactor and method for repairing soil with organic contamination
  • Spiral stirring type bioreactor and method for repairing soil with organic contamination

Examples

Experimental program
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Effect test

Embodiment 1

[0031] When dealing with PCB-contaminated soil, put 4m into the tank through the feed port 3 Contaminate the soil, and at the same time, the liquid spraying device sprays biosurfactant with a concentration of 4% (v / v) according to the liquid-solid ratio of 3:1, dilutes the contaminated soil to a certain concentration of mud, and adjusts the pH to 6.5. Turn on the left and right spiral stirring device and aeration device, control the stirring speed to 150r / min, the mud temperature to 30°C, and the air velocity to 0.5m 3 / h. Stir for 10 minutes to make the surfactant fully contact with the soil, promote the transfer of pollutants to the liquid phase, and prepare for the efficient and rapid degradation of pollutants. Turn on the liquid spray device and press 5.5×10 7 Bacteria solution / kg soil is added to the bacterial solution, and the volume and mass of the bacterial solution is 1L / m 3 Soil, nutrients in the bacterial solution C:N:P=100:10:1. Stirring and aeration are contin...

Embodiment 2

[0033] When treating phthalate-contaminated soil, put 4m into the tank 3 To pollute the soil, spray the biosurfactant with a concentration of 1% (v / v) according to the liquid-solid ratio of 2:1 at the same time, dilute the contaminated soil to a certain concentration of mud, and adjust the pH to 7.1. Turn on the left and right spiral stirring device and aeration device, control the stirring speed to 100r / min, the mud temperature to 25°C, and the air velocity to 0.1m 3 / h. Stir for 5 minutes to make the surfactant fully contact with the soil and promote the transfer of pollutants to the liquid phase. Turn on the liquid spray device Press 3×10 7 Bacteria solution / kg soil is added to the bacterial solution, and the volume and mass of the bacterial solution is 0.5L / m 3 Soil, nutrients in the bacterial solution C:N:P=100:10:1. Stirring and aeration are continued at the same time, and the online monitoring system is used to observe the pH, temperature, and oxygen content indicat...

Embodiment 3

[0035] When dealing with petroleum hydrocarbons and polycyclic aromatic hydrocarbons compound polluted soil, put 4m into the tank 3 To pollute the soil, spray the biosurfactant with a concentration of 2% (v / v) according to the liquid-solid ratio of 3:1 at the same time, dilute the contaminated soil to a certain concentration of mud, and adjust the pH to 7.5. Turn on the left and right spiral stirring device and aeration device, control the stirring speed to 120r / min, the mud temperature to 28°C, and the air velocity to 0.3m 3 / h. Stir for 10 minutes to make the surfactant fully contact with the soil and promote the transfer of pollutants to the liquid phase. Turn on the liquid spraying device and add the bacterial liquid at 4×107 strains / kg of soil, the added volume and mass of the bacterial liquid is 0.8L / m3 soil, and the nutrients in the bacterial liquid are C:N:P=100:10:1. Stirring and aeration are continued at the same time, and the online monitoring system is used to ob...

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Abstract

The invention discloses a spiral stirring type bioreactor and method for repairing soil with organic contamination, belonging to the field of bioremediation of soil with organic contamination. The reactor mainly comprises a reactor tank body, a base bracket, a liquid spraying device, a leftward-and-rightward-rotating spiral stirring device, an excitation solid-liquid separation device, a driving device, an aeration device and the like. The method for repairing the soil with organic contamination by using the reactor comprises the following steps: feeding the contaminated soil into the tank body from a feeding hole, and spraying biological cleaning liquid and bacterial liquid by using the spraying device; enabling the soil and the cleaning liquid to be fully mixed through spiral stirring; ensuring that the oxygen content in the tank body to be not lower than 1.5 mg / L by using the aeration device; and after synchronous stirring and aerating for a certain period of time, separating waterand soil by utilizing the excitation solid-liquid separation device to finish remediation. The method is good in mass transfer effect, thorough in reaction, low in sewage treatment load, high in treatment efficiency and capable of effectively treating soil having medium-and-high-concentration organic contamination and difficult to degrade.

Description

technical field [0001] The invention relates to the technical field of bioremediation of organic polluted soil, in particular to a spiral stirring bioreactor and method for remediating organic polluted soil. Background technique [0002] With the rapid development of industrial production, township enterprises and rural urbanization, the problem of organic soil pollution has become increasingly serious. The treatment of organic polluted soil mainly uses physical, chemical and biological remediation methods. Although the physical remediation method can reduce the concentration of pollutants, the treatment cost is relatively high; although the chemical remediation method can achieve the removal of various pollutants, it also has the disadvantages of secondary pollution and high treatment costs; the bioremediation method uses microorganisms Life metabolism activities reduce the concentration of organic pollutants or make them completely harmless, and can degrade different type...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09C1/10
CPCB09C1/10
Inventor 曹斐姝陈建平廖长君韦湘贵朱红祥颜德鹏杨燕媛林月婕廖妤婕
Owner GUANGXI BOSSCO ENVIRONMENTAL PROTECTION TECH
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