三乙烯和Cr/As与高硫酸盐共同污染的土壤的电动生物修复
Qizheng Cai1, Chongwen Shi1, Zixuan Cao1
1State Key Laboratory of Biogeology and Environmental Geology, China University of Geosciences, No. 68 Jincheng Street, East Lake High-Tech Development Zone, Wuhan 430078, PR China.
Journal of hazardous materials
|February 16, 2024
概括
电动力学生物修复 (EK-BIO) 有效地从具有挑战性的土壤中去除化溶剂和重金属等共污染物. 这种方法通过促进营养物质的输送和为微生物活动创造有利条件来增强污染物去除.
科学领域:
- 环境科学 环境科学
- 地质化学 地质化学
- 微生物学 微生物学
背景情况:
- 复杂的地下条件和共同污染物带来了重大修复挑战.
- 具有高硫酸盐含量的低透性土壤特别难以处理.
研究的目的:
- 为了证明电动力学生物修复 (EK-BIO) 在具有挑战性的土壤环境中处理共污染物 (溶剂和重金属) 的有效性.
- 阐明在硫酸盐丰富,低透性土壤中的EK-BIO处理背后的机制.
主要方法:
- 使用受三乙烯 (TCE),CrVI和AsIII污染的田地土壤建立了EK-BIO列.
- 柱子供应了乳酸盐和硫酸盐,并定期注射了包括Dehalococcoides (Dhc) 在内的脱联盟.
- 治疗时间为199天,电位梯度约为1V/cm.
主要成果:
- 实现了顺序的硫酸盐降解,Cr/As固定,以及完全的TCE生物脱.
- EK-BIO促进了基本基质和污染物的运输,促进了减少条件.
- 硫酸盐通过硫化物生成促进了Cr6的固定,这也减轻了Cr6的毒性,增强了TCE的生物降解.
- 微生物群体对As(III表现出耐受性,甲基因组分析揭示了Dhc活性和金属排毒的潜在协同相互作用.
结论:
- EK-BIO是一种可行且有效的技术,用于在困难的土壤基质中修复复杂的共同污染物混合物.
- 硫酸盐在增强重金属固定和减轻毒性方面发挥着至关重要的作用,从而支持有效的生物修复.
- 这项研究为EK-BIO治疗期间微生物群体内的协同相互作用提供了有价值的机制性见解.
相关概念视频
Bioremediation
18.4K
Bioremediation is the use of prokaryotes, fungi, or plants to remove pollutants from the environment. This process has been used to remove harmful toxins in groundwater as a byproduct of agricultural run-off and also to clean up oil spills.
18.4K
Precipitation and Co-precipitation
1.8K
Precipitation and coprecipitation methods can be used to separate a mixture of ions in a solution. In qualitative inorganic analysis, ions that form sparingly soluble precipitates with the same reagent are separated based on the differences in solubility products. For example, consider the separation of Cu(II) and Fe(II) ions by precipitation as insoluble sulfides. First, copper(II) sulfide is precipitated by the addition of acidic H2S, where the dissociation of H2S is suppressed. Adding H2S...
1.8K
Extraction: Advanced Methods
447
Metal ions can be separated from one another by complexation with organic ligands–the chelating agent– to form uncharged chelates. Here, the chelating agent must contain hydrophobic groups and behave as a weak acid, losing a proton to bind with the metal. Since most organic ligands used in this process are insoluble or undergo oxidation in the aqueous phase, the chelating agent is initially added to the organic phase and extracted into the aqueous phase. The metal-ligand complex is...
447
Coagulation
297
Colloidal solids are solid particles suspended in solution. They are usually negatively charged, attracting a compact primary layer of positively charged ions, which attract more counterions to form an electrical double layer. Electrostatic repulsion between the charged double layers prevents the particles from colliding, stabilizing the colloids. These solids are often undesirable because they can contain toxins that are difficult to remove. Coagulation is a technique that helps aggregate and...
297


