Overestimate of remediation efficiency due to residual sodium persulfate in PAHs contaminated soil and a solution

Paper-ash is used for remediation of heavily contaminated soils with metals, but remediation efficiency after longer periods has not been reported. To gain insights into the mechanisms of immobilization of cadmium (Cd), lead (Pb), and znic (Zn), a study was performed in the laboratory experiment in uncontaminated, artificially contaminated, and remediated soils, and these soils treated with sulfate, to mimic conditions in contaminated soil from zinc smelter site. Remediation was performed by mixing contaminated soil with paper-ash to immobilize Cd, Pb, and Zn in the geotechnical composite. Partitioning of Cd, Pb, and Zn was studied over one year in seven-time intervals applying the sequential extraction procedure and complementary X-ray diffraction analyses. This methodological approach enabled us to follow the redistribution of Cd, Pb, and Zn over time, thus, to studying immobilization mechanisms and assessing the remediation efficiency and stability of newly formed mineral phases. Cd, Pb, and Zn were effectively immobilized by precipitation of insoluble hydroxides after the addition of paper-ash and by the carbonization process in insoluble carbonate minerals. After remediation, Cd, Pb, and Zn concentrations in the water-soluble fraction were well below the limiting values for inertness: Cd by 100 times, Pb by 125 times, and Zn by 10 times. Sulfate treatment did not influence the remediation efficiency. Experimental data confirmed the high remediation efficiency and stability of insoluble Cd, Pb, and Zn mineral phases in geotechnical composites.

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Different Chemical Oxidant of Benzene Series Pollution Site Repair Effect

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.989-994.564 ◽

2014 ◽

Vol 989-994 ◽

pp. 564-567

Author(s):

Ding Long Li ◽

Xin Lei Fang ◽

Min Da Yu ◽

Hao Lv ◽

Yan Yang

Keyword(s):

Hydrogen Peroxide ◽

Contaminated Soil ◽

Removal Rate ◽

Antioxidant Effect ◽

Soil Bioremediation ◽

Sodium Persulfate ◽

Combined Pollution ◽

Fenton Reagent ◽

Experiment Research ◽

Benzene Series

this study intends to compare through the experiment research of potassium permanganate, Fenton reagent, sodium persulfate, hydrogen peroxide, four kinds of commonly used oxidant chlorobenzene in contaminated soil, the removal effect of O-O-dichlorobenzene;, selected a typical ground soil bioremediation is the best antioxidant effect. Research under the condition of different on the dose, 4 kinds of oxidants to chlorobenzene and O-O-dichlorobenzene; removal effect. Combined pollution ground soil properties screen of chlorobenzene in contaminated soil, the highest removal rate of dichlorobenzene oxidant and best delivery dosage, to apply typical ground soil bioremediation, the results show that the effect is the best Kmno4.

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Potential evaluation of different intercropping remediation modes based on remediation efficiency and economic benefits – a case study of arsenic-contaminated soil

International Journal of Phytoremediation ◽

10.1080/15226514.2021.1920571 ◽

2021 ◽

pp. 1-9

Author(s):

Yunxian Yan ◽

Jun Yang ◽

Yue Guo ◽

Junxing Yang ◽

Xiaoming Wan ◽

...

Keyword(s):

Contaminated Soil ◽

Economic Benefits ◽

Remediation Efficiency ◽

Potential Evaluation

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Bioremediation of engine-oil contaminated soil using local residual organic matter

10.7287/peerj.preprints.27696 ◽

2019 ◽

Author(s):

Kawina Robichaud ◽

Miriam Lebeau ◽

Sylvain Martineau ◽

Marc Amyot

Keyword(s):

Contaminated Soil ◽

Treatment Time ◽

Low Cost ◽

Carbon Sources ◽

Engine Oil ◽

Fertilizer Treatment ◽

Biolog Ecoplates ◽

Catabolic Diversity ◽

Remediation Efficiency ◽

Spent Grain

Soil remediation industries continue to seek technologies to speed-up treatment and reduce operating costs. Some processes are energy intensive and, in some cases, transport can be the main source of carbon emissions. Residual fertilizing matter (RFM), such as organic residues, have the potential to be beneficial bioremediation agents. Following a circular economy framework, we investigated the feasibility of sourcing RFMs locally to reduce transport and assess possible bioremediation efficiency gains. RFMs were recruited within 100 km of the treatment site: ramial chipped wood (RCW), horse manure (MANR) and brewer spent grain (BSG). They were added to the land treatment unit’s baseline fertilizer treatment (FERT, ‘F’) to measure if they improved the remediation efficiency of an engine oil-contaminated soil (7500 ± 100 mg kg-1). Results indicate that MANR-F was the only amendment more effective than FERT for PHC reduction, while emitting the least CO2overall. RCW-F was equivalent to FERT but retained more moisture. Although BSG contributed the most nitrogen to the soil, BSG-F retained excessive moisture, emitted more VOCs, contained less soil O2, and was less effective than the baseline treatment. Significantly more of the C16-C22fraction was removed (63 ± 22%) than all other fractions (C22-C28, C28-C34, C34-C40), which were equally removed. Microbial community-level physiological profiling (CLPP) was conducted with Biolog EcoplatesTM, and catabolic diversity differed between treatments (utilization rates of 31 carbon sources). MANR-F has the potential to increase PHC-remediation speed and efficiency compared to inorganic fertilizer alone. Other RFM promote moisture retention and diverse microbial catabolic activity. A variety of RFM are present across the globe and some can offer low-cost amendments to boost remediation efficiency, while reducing treatment time compared to traditional fertilizer-only methods.

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