Integrated soil washing and bioreactor systems for the treatment of hexachlorocyclohexane contaminated soil: A review on enhanced degradation mechanisms, and factors affecting soil washing and bioreactor performances

Srivastava, Vartika; Puri, Mehak; Srivastava, Tanmay; Nidheesh, P.V.; Kumar, Manish

doi:10.1016/j.envres.2022.112752

Cited by 20 publications

(4 citation statements)

References 89 publications

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“…The degradation rate of α-HCH was 3.5% with a degradation amount of 0.426 mg/kg after 84 days, while the degradation rate of γ-HCH was 6.1% with a degradation amount of 3.382 mg/kg, which may be mainly due to volatilization [34]. In the blank experimental group, the degradation rates of α-HCH and γ-HCH were 50.2% and 77.0% after 84 days, respectively, which may The degradation rate of α-HCH was 3.5% with a degradation amount of 0.426 mg/kg after 84 days, while the degradation rate of γ-HCH was 6.1% with a degradation amount of 3.382 mg/kg, which may be mainly due to volatilization [34]. In the blank experimental group, the degradation rates of α-HCH and γ-HCH were 50.2% and 77.0% after 84 days, respectively, which may be due to the degradation effect of indigenous microorganisms.…”

Section: Results Of Hchs Degradation In Soilmentioning

confidence: 95%

“…The concentrations of α-HCH and γ-HCH in the soil of the sterilization experimental group showed a slightly decreasing trend. The degradation rate of α-HCH was 3.5% with a degradation amount of 0.426 mg/kg after 84 days, while the degradation rate of γ-HCH was 6.1% with a degradation amount of 3.382 mg/kg, which may be mainly due to volatilization[34]. In the blank experimental group, the degradation rates of α-HCH and γ-HCH were 50.2% and 77.0% after 84 days, respectively, which may be due to the degradation effect of indigenous microorganisms.…”

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confidence: 95%

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Analysis of the Degradation of OCPs Contaminated Soil by the BC/nZVI Combined with Indigenous Microorganisms

Zhang

Wan

et al. 2023

IJERPH

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Organochlorine pesticides (OCPs) were typical persistent organic pollutants that posed great hazards and high risks in soil. In this study, a peanut shell biochar-loaded nano zero-valent iron (BC/nZVI) material was prepared in combination with soil indigenous microorganisms to enhance the degradation of α-hexachlorocyclohexane(α-HCH) and γ-hexachlorocyclohexane(γ-HCH) in water and soil. The effects of BC/nZVI on indigenous microorganisms in soil were investigated based on the changes in redox potential and dehydrogenase activity in the soil. The results showed as follows: (1) The specific surface area of peanut shell biochar loaded with nano-zero-valent iron was large, and the nano-zero-valent iron particles were evenly distributed on the peanut shell biochar; (2) peanut shell BC/nZVI had a good degradation effect on α-HCH and γ-HCH in water, with degradation rates of 64.18% for α-HCH and 91.87% for γ-HCH in 24 h; (3) peanut shell BC/nZVI also had a good degradation effect on α-HCH and γ-HCH in soil, and the degradation rates of α-HCH and γ-HCH in the 1% BC/nZVI reached 55.2% and 85.4%, second only to 1% zero-valent iron. The degradation rate was the fastest from 0 to 7 days, while the soil oxidation-reduction potential (ORP) increased sharply. (4) The addition of BC/nZVI to the soil resulted in a significant increase in dehydrogenase activity, which further promoted the degradation of HCHs; the amount of HCHs degradation was significantly negatively correlated with dehydrogenase activity. This study provides a remediation strategy for HCH-contaminated sites, reducing the human health risk of HCHs in the soil while helping to improve the soil and increase the activity of soil microorganisms.

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Section: Results Of Hchs Degradation In Soilmentioning

confidence: 95%

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confidence: 95%

Analysis of the Degradation of OCPs Contaminated Soil by the BC/nZVI Combined with Indigenous Microorganisms

Zhang

Wan

et al. 2023

IJERPH

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“…Increasing retention time may also increase the amount of water required for soil washing, which can lead to higher costs and potential environmental effects, such as increased water usage and discharge. Overall, while increasing retention time can improve soil washing efficiency sometimes, it is important to consider other factors such as cost-effectiveness and environmental effects when determining optimal retention times for specific soil remediation projects 28 , 35 , 36 . In Bianco and coworkers' 37 and Kang and coworkers 38 studies, 60 min reported as an optimum retention time to PAHs removal from soil.…”

Section: Resultsmentioning

confidence: 99%

“…Therefore, the mixing speed plays a crucial role in the soil washing process performance. The effect of mixing speed on soil washing process can be summarized as follows 35 : Extraction efficiency: The extraction efficiency of contaminants from soil increases with increasing mixing speed. This is because higher mixing speeds create more turbulence, which enhances the contact between the soil particles and the washing solution, resulting in better extraction of contaminants.…”

Section: Resultsmentioning

confidence: 99%

Optimisation of soil washing method for removal of petroleum hydrocarbons from contaminated soil around oil storage tanks using response surface methodology

Zoghi,

Mafigholami

2023

Sci Rep

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Total petroleum hydrocarbons (TPHs), which are often found in soil, water, sediments, and air. These compounds are a type of pollutant that can have a serious negative impact on living things and human health. Soil washing method is a remediation technique used to remove contaminants from the soil. This process involves the use of water or other solvents to extract contaminants from the soil, followed by separation and disposal of the contaminated solution. This research engineered the effectiveness of soil washing method to remove TPHs from a genuine, sullied soil sample. After analyzing the physical and chemical properties of the soil, the Box-Benken Design (BBD) technique was used to optimize the variables that influence the process's effectiveness. A quadratic model was suggested based on the BBD design, correlation coefficients, and other factors. The minimum, maximum and mean removal of TPHs during the stages of the study were 63.5, 94.5 and 76.7%, respectively. The correlation between the variables was strong, as shown by the analysis of variance (ANOVA), F-value (1064.5) and P-value (0.0001), and the proposed model was highly significant. The most effective soil washing method (SWM) was obtained with pH 7.8, liquid to solid ratio 50:1, reaction time 52 min, surfactant concentration 7.9 mg kg−1, and three washings. A removal rate of 98.8% was accomplished for TPHs from the soil in this context. The kinetic results indicate that the kinetic of TPHs removal follows the first-order kinetics (R2 = 0.96). There was not a major difference in the process's efficiency based on temperature. The removal efficiency heightened from 0 to 150 rpm and then remained steady. Introducing air flow increased the rate of removal, and the combination of ultrasonic waves with the reaction environment increased the process efficiency and decreased the time for the process and the amount of times it needed to be washed. An analysis of the washed soil both physically and chemically revealed a substantial decrease in the concentration of other elements.

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A review for recent advances on soil washing remediation technologies

Zhang

Shen

et al. 2022

Bull Environ Contam Toxicol

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Integrated soil washing and bioreactor systems for the treatment of hexachlorocyclohexane contaminated soil: A review on enhanced degradation mechanisms, and factors affecting soil washing and bioreactor performances

Cited by 20 publications

References 89 publications

Analysis of the Degradation of OCPs Contaminated Soil by the BC/nZVI Combined with Indigenous Microorganisms

Analysis of the Degradation of OCPs Contaminated Soil by the BC/nZVI Combined with Indigenous Microorganisms

Optimisation of soil washing method for removal of petroleum hydrocarbons from contaminated soil around oil storage tanks using response surface methodology

A review for recent advances on soil washing remediation technologies

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