Desorption Kinetics and Removal Characteristics of Pb-Contaminated Soil by the Soil Washing Method: Mixing Ratios and Particle Sizes

2012 ◽  
Vol 17 (3) ◽  
pp. 145-150 ◽  
Author(s):  
Yun-Hee Lee ◽  
Seong-Wook Oa
Keyword(s):  
Contaminated Soil ◽  
Soil Washing ◽  
Desorption Kinetics ◽  
Particle Sizes ◽  
Mixing Ratios ◽  
Washing Method

Characterizing the Photodegradation Ability of Pentachlorophenol in β-Cyclodextrin Soil Washing Solution

2015 ◽  
Vol 768 ◽  
pp. 155-163 ◽  
Author(s):  
Ze Yu Zhou ◽  
Hong Tao Wang ◽  
Wen Jing Lu
Keyword(s):  
Soil Remediation ◽  
Contaminated Soil ◽  
Degradation Rate ◽  
Soil Washing ◽  
Aeration Rate ◽  
Degradation Processes ◽  
Photodegradation Rate ◽  
Washing Method ◽  
Sun Light

The objective of this study was to characterize the photodegradation ability of pentachlorophenol (PCP) in β-cyclodextrin (β-CD) soil washing solution. After contaminated soil remediation by β-CD soil washing method, solution contained target contaminant was further treated with photodegradation technique. Degradation processes with Xe lamp to simulate natural sun light was investigated under different temperature, and various aeration rate. TiO2employed as photocatalyst was also tested in the soil washing system. The result demonstrated that photodegradation rate of PCP in soil washing solution was related to the aeration rate. The reaction could be slightly accelerated by increasing the temperature. TiO2adding will decrease the degradation speed, while using it together with H2O2will extremely increase the degradation rate of the target contaminant in this condition.

scholarly journals Integrated Nanozero Valent Iron and Biosurfactant-Aided Remediation of PCB-Contaminated Soil

2016 ◽  
Vol 2016 ◽  
pp. 1-11 ◽  
Author(s):  
He Zhang ◽  
Baiyu Zhang ◽  
Bo Liu
Keyword(s):  
Contaminated Soil ◽  
Soil Washing ◽  
Zero Valent Iron ◽  
Temperature Changes ◽  
Initial Ph ◽  
Washing Method ◽  
Deep Underground ◽  
Ph Level ◽  
Pcb Dechlorination ◽  
Historical Issues

Polychlorobiphenyls (PCBs) have been identified as environmental hazards for years. Due to historical issues, a considerable amount of PCBs was released deep underground in Canada. In this research, a nanoscale zero valent iron- (nZVI-) aided dechlorination followed by biosurfactant enhanced soil washing method was developed to remove PCBs from soil. During nZVI-aided dechlorination, the effects of nZVI dosage, initial pH level, and temperature were evaluated, respectively. Five levels of nZVI dosage and two levels of initial pH were experimented to evaluate the PCB dechlorination rate. Additionally, the temperature changes could positively influence the dechlorination process. In soil washing, the presence of nanoiron particles played a key role in PCB removal. The crude biosurfactant was produced using a bacterial stain isolated from the Atlantic Ocean and was applied for soil washing. The study has led to a promising technology for PCB-contaminated soil remediation.

Remediation of Heavy Metals Contaminated Soil and Soil Washing

2015 ◽  
Vol 5 (3) ◽  
pp. 1-6 ◽  
Author(s):  
Zainab Siddiqui ◽  
◽  
S.M Ali Jawaid ◽  
Sandeep Vishen ◽  
Shreya Verma ◽  
...  
Keyword(s):  
Heavy Metals ◽  
Contaminated Soil ◽  
Soil Washing

scholarly journals Applicability of soil washing method for radionuclide-contaminated soils from road maintenance in Fukushima

2015 ◽  
Vol 10 (4) ◽  
pp. 489-502
Author(s):  
Osamu TAKAHATA ◽  
Shojirou KUMADA ◽  
Junya ANDO ◽  
Shinji MIYAGUCHI ◽  
Koji ISHIYAMA ◽  
...  
Keyword(s):  
Contaminated Soils ◽  
Soil Washing ◽  
Road Maintenance ◽  
Washing Method

scholarly journals Changes in Soil Properties after Soil Washing of Metal-contaminated Soil near the former Janghang Smelter

2020 ◽  
Vol 42 (10) ◽  
pp. 482-492
Author(s):  
Keong-Hyeon An ◽  
Songhee Kim ◽  
Seung-Woo Jeong
Keyword(s):  
Soil Quality ◽  
Soil Texture ◽  
Contaminated Soil ◽  
Soil Property ◽  
Soil Health ◽  
Soil Washing ◽  
Fine Soil ◽  
Before And After ◽  
Chemical Washing ◽  
Changes In Soil Properties

Objectives : Changes in soil properties after washing of metal-contaminated soil near the former Janghang Smelter were investigated in this study. Contaminated input soils and remediated output soils were sampled from three different soil washing plants and analyzed for soil physical and chemical properties. Soil quality was evaluated by the soil fertilization guideline suggested by the Korea Rural Development Administration (KRDA). This study revealed the necessity of soil quality management for the remediated soil as an ecosystem member.Methods : Three soil washing plants (1OU, 2OU, 3OU) were commonly divided into the five steps: 1) the particle separation (crushing and grinding etc.) → 2) soil particle classification (big stone, fine soil, minimal fine soil) → 3) chemical washing (fine soil) → 4) neutralization of washed soil (lime) → 5) return-back to the original position. The separating minimum particle diameters of the 1OU, 2OU, and 3OU washing processes were 5 µm, 20 µm, and 10 µm, respectively, and the chemical washing solutions used were respectively 0.1 M H2SO4, 0.5 M H2SO4/0.5 M H3PO4, and 0.1 N NaOH-Na2CO3 (alkali reduction). Soils were collected before and after washing, air-dried, sieved with < 2 mm and analyzed for soil texture, bulk density, aggregate stability (AS), water holding capacity (WHC), pH, electrical conductivity (EC), organic matter content (OM), total nitrogen (TN), available phosphate (AvP), cation exchange capacity (CEC), exchangeable cations (potassium, calcium, magnesium, sodium).Results and Discussion : Sandy soil showed a big change in soil texture before and after soil washing, while there was no change in soil texture for fine soil. Sandy soil showed an increase in bulk density, a decrease in WHC, and a decrease in AS. The pH of remediated soil was affected by the type of washing chemical. The acidic washing processes (1OU, 2OU) resulted in low pH soils, while an alkali reduction process (3OU) showed high pH soil. The soil OM, TN, AvP and CEC decreased after soil washing. In the case of silty paddy soil, OM and TN were significantly reduced by washing. The most important change in soil property after washing was EC. After soil washing, the soil electrical conductivity increased sharply in all OUs : 1OU 0.51 → 6.21 ds/m, 2OU 1.09 → 3.73 ds/m, 3OU 0.99 → 9.30 ds/m. The EC values of the contaminated soil before washing were all less than 2 ds/m, which is an appropriate agricultural level. However, EC was significantly increased after washing, implying a strong salty soil level. The soil quality evaluation results before and after washing showed that the soil quality of heavy-metal contaminated soil was apparently degraded by washing. The number of soil property in the optimal range before washing (contaminated soil) was 10, but the number decreased to 5 after washing (remediated soil).Conclusions : Soil quality may be significantly changed after soil washing. The most noticeable change was the significant increase in the EC of soil and the soil health should be restored first to recycle the remediated soil. The important causes of changes in the soil quality were the separation of fine soil particles containing relatively high heavy metals from the bulk soil, soil disturbance by chemical washing solution and addition of high salts such as coagulants and pH adjust. Soil management schemes considering soil health should be soon prepared to restore the remediated soil back as an ecosystem member.

scholarly journals Effect of chelating agents on removal of 137Cs from contaminated soil

2018 ◽  
Vol 15 (35) ◽  
pp. 158-168
Author(s):  
Firas M. Radhi
Keyword(s):  
Removal Efficiency ◽  
Contaminated Soil ◽  
Chelating Agents ◽  
Soil Samples ◽  
Coarse Grained ◽  
Tetraacetic Acid ◽  
Mixing Ratio ◽  
Soil Mixing ◽  
Chemical Washing ◽  
Washing Method

In the present research, the chemical washing method has been selected using three chelating agents: citric acid, acetic acid and Ethylene Diamine Tetraacetic Acid (EDTA) to remove 137Cs from two different contaminated soil samples were classified as fine and coarse grained. The factors that affecting removal efficiency such as type of soil, mixing ratio and molarity have been investigated. The results revealed that no correlation relation was found between removal efficiency and the studied factors. The results also showed that conventional chemical washing method was not effective in removing 137Cs and that there are further studies still need to achieve this objective.

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