Preparation method and application of biochar-based carrier modified through high-temperature alkalization

A biochar, modified technology, applied in the direction of immobilization on or in an inorganic carrier, can solve the problems of poor immobilization effect and weak microbial activity, and achieve increased hydrophobicity, high biological activity, and increased specific surface area. Effect

Inactive Publication Date: 2017-12-29
CHINA NAT PETROLEUM CORP SAFETY & ENVIRONMENTAL TECH RES INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In order to solve the above problems, the present invention provides a biochar-based carrier preparation method for bioremediation of petroleum-contaminated soils, with controlled etching of internal pores and surface alkalization modification, to solve the problem of weak microbial activity, The immobilization effect is poor and other shortcomings, and agricultural waste such as straw and corncobs are used as raw materials, providing an effective way for the resource utilization of agricultural waste

Method used

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  • Preparation method and application of biochar-based carrier modified through high-temperature alkalization
  • Preparation method and application of biochar-based carrier modified through high-temperature alkalization
  • Preparation method and application of biochar-based carrier modified through high-temperature alkalization

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Embodiment 1

[0041] The present invention will be further described below in conjunction with accompanying drawing of description and specific embodiment:

[0042] In this example, a carbon-based immobilized bioremediation bacterial agent was prepared for the soil in the petroleum hydrocarbon-contaminated area of ​​the Changning shale gas well site in Sichuan.

[0043] Using corncobs as raw materials, the lignin content is 18%, and the total cellulose content is 70%. Wash the corn cobs with tap water and pure water in turn, dry at 60°C for 12 hours, crush the dried raw materials, and pass through a 20-mesh sieve. Take the pulverized raw materials, put them in a heating furnace, raise the temperature to 400°C at a heating rate of 10°C / min, and pyrolyze for 3 hours. During the heating process, the oxygen concentration is controlled at 10% (v / v). After cooling and taking out, the prepared The biochar-based carrier is ground and passed through a 200-mesh sieve.

[0044] The cooled corncobs a...

Embodiment 2

[0053] In this example, a carbon-based immobilized bioremediation bacterial agent was prepared for the soil in the petroleum hydrocarbon-contaminated area of ​​Tarim Oilfield, Xinjiang.

[0054] Using straw as raw material, the lignin content is 20%, and the total cellulose content is 65%. Wash the straw with tap water and pure water successively, dry at 54°C for 15 hours, pulverize the dried raw materials, and pass through a 20-mesh sieve. Take the pulverized raw materials, put them in a heating furnace, raise the temperature to 500°C at a heating rate of 15°C / min, and pyrolyze for 4 hours. During the heating process, the oxygen concentration is controlled at 12% (v / v). After cooling and taking out, the prepared The biochar-based carrier is ground and passed through a 200-mesh sieve.

[0055] Considering that during the growth and collection of straw, the frequency of contact with inorganic substances is high, and the inorganic substances in the raw materials are high, which...

Embodiment 3

[0066] This example is aimed at the preparation of carbon-based immobilized bioremediation bacterial agents for the soil in petroleum hydrocarbon-contaminated areas of Shaanxi Changqing Oilfield.

[0067] Using corncobs as raw materials, the lignin content is 15%, and the total cellulose content is 68%. Wash the corn cobs with tap water and pure water in turn, dry at 62°C for 11 hours, crush the dried raw materials, and pass through a 20-mesh sieve. Take the pulverized raw materials, put them in a heating furnace, raise the temperature to 450°C at a heating rate of 10°C / min, and pyrolyze for 3 hours. During the heating process, the oxygen concentration is controlled at 11% (v / v). After cooling and taking out, the prepared The biochar-based carrier is ground and passed through a 200-mesh sieve.

[0068] The cooled corncobs are placed in a mixed acid of 1.5% (v / v) nitric acid and 0.8% (v / v) hydrofluoric acid, soaked for 3 hours, and filtered to remove the residual acid solution...

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Abstract

The invention belongs to the technical field of environmental remediation and the field of microbial immobilization and particularly relates to a preparation method and an application of a biochar-based carrier modified through high-temperature alkalization. The preparation method is characterized in that by means of the steps of drying and smashing of biomass materials, pyrolysis, cooling, acidification and alkalization as well as controlled etching processing for pore channels in biochar, the pore channel structure in the biochar is beneficial to microbial growth and metabolism, and the biochar whose surface is modified with a high-temperature alkaline solution is used for preparing a carbon-based immobilized microbial agent. According to the preparation method, the biochar is prepared from the biomass materials such as straw and corncob, the pore diameter and length of gaps in the prepared biochar-based carrier are controlled precisely through controlled etching of the pore channels in the biochar, so that the pore channel structure in the biochar is beneficial to microbial growth and metabolism, finally, the biochar subjected to surface modification can be used for preparing the carbon-based immobilized microbial agent, and the biochar-based carrier is used for remediating petroleum hydrocarbon contaminated soil and treating agricultural waste.

Description

technical field [0001] The invention belongs to the field of environmental remediation technology and the field of microorganism immobilization, and specifically relates to a preparation method and application of a high-temperature alkalization modified biochar-based carrier. It is a method for immobilizing petroleum-degrading bacteria and applying it to remediate petroleum-contaminated soil. Background technique [0002] With the operation of the petrochemical industry, the soil pollution caused by the exploitation, storage, transportation and refining of oil and shale gas has seriously threatened people's health. The organic hydrocarbons in petroleum not only destroy the soil structure, reduce the soil function, make the land unable to cultivate and soil compaction, because it is difficult to be degraded in the natural environment, but also inhibit microbial metabolic activities, and the petroleum hydrocarbons accumulated in plants , causing food safety issues, pollutan...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C12N11/14
CPCC12N11/14
Inventor 任宏洋王兵马伶俐谢红丽李珍珍
Owner CHINA NAT PETROLEUM CORP SAFETY & ENVIRONMENTAL TECH RES INST CO LTD
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