In-situ chemical oxidation: peroxide or persulfate coupled with membrane technology for wastewater treatment

2021 ◽  
Author(s):  
Huchuan Yan ◽  
Cui Lai ◽  
Dongbo Wang ◽  
Shiyu Liu ◽  
Xiaopei Li ◽  
...  
Keyword(s):  
Wastewater Treatment ◽  
Organic Pollutants ◽  
Health And Safety ◽  
Chemical Oxidation ◽  
Membrane Technology ◽  
In Situ Chemical Oxidation ◽  
Refractory Organic Pollutants

Refractory organic pollutants in wastewater have the characteristics of persistence and toxicity, which seriously threaten the health and safety of humans and other organisms. Many researchers have committed to developing...

scholarly journals Remediating Potentially Toxic Metal and Organic Co-Contamination of Soil by Combining In Situ Solidification/Stabilization and Chemical Oxidation: Efficacy, Mechanism, and Evaluation

2018 ◽  
Vol 15 (11) ◽  
pp. 2595 ◽  
Author(s):  
Yan Ma ◽  
Zhenhai Liu ◽  
Yanqiu Xu ◽  
Shengkun Zhou ◽  
Yi Wu ◽  
...  
Keyword(s):  
Organic Pollutants ◽  
Toxic Metals ◽  
Contaminated Soil ◽  
Combined Treatment ◽  
Chemical Oxidation ◽  
Pollutant Removal ◽  
Potentially Toxic Metals ◽  
In Situ Chemical Oxidation ◽  
Activated Persulfate

Most soil remediation studies investigated single contaminants or multiple contaminants of the same type. However, in field conditions, soils are often contaminated with potentially both toxic metals and organic pollutants, posing a serious technical challenge. Here, batch experiments were conducted to evaluate the performance of combining in situ solidification/stabilization (ISS) and in situ chemical oxidation (ISCO) for the simultaneous removal of aniline (1000 mg/kg) and Cd (10 mg/kg). All four tested ISS amendments, especially quick lime and Portland cement, promoted in situ chemical oxidation with activated persulfate in contaminated soil. Combined ISS/ISCO remediation effectively removed aniline and reduced the bioavailable Cd content at optimal initial persulfate and ISS amendment concentrations of 1.08 mol/kg and 30 wt% with a seven-day curing time, and significantly reduced leaching. Persulfate inhibited the reduction of the bioavailable Cd content, and ISS amendment with persulfate did not synergistically remediate Cd in co-contaminated soil. Strong alkalinity and high temperature were the main mechanisms driving rapid pollutant removal and immobilization. The reaction of CaO with water released heat, and Ca(OH)2 formation increased the pH. The relative contributions of heat vs. alkaline activation, as well as the contaminant removal efficiency, increased with ISS amendment CaO content. Combined treatment altered the soil physicochemical properties, and significantly increased Ca and S contents. Activated persulfate-related reactions did not negatively impact unconfined compressive strength and hydraulic conductivity. This work improves the selection of persulfate activation methods for the treatment of soils co-contaminated with both potentially toxic metals and organic pollutants.

scholarly journals Decontamination of dense nonaqueous-phase liquids in groundwater using pump-and-treat and in situ chemical oxidation processes: a field test

RSC Advances ◽  
2021 ◽  
Vol 11 (7) ◽  
pp. 4237-4246
Author(s):  
Tian Xie ◽  
Zhi Dang ◽  
Jian Zhang ◽  
Qian Zhang ◽  
Rong-Hai Zhang ◽  
...  
Keyword(s):  
Field Test ◽  
Chemical Oxidation ◽  
Nonaqueous Phase Liquids ◽  
Dense Nonaqueous Phase Liquids ◽  
In Situ Chemical Oxidation ◽  
Oxidation Processes ◽  
Pump And Treat

The combination of pump-and-treat and in situ chemical oxidation processes can effectively accelerate the remediation of DNAPL pollutant in groundwater.

Comparison of the effectiveness of soil heating prior or during in situ chemical oxidation (ISCO) of aged PAH-contaminated soils

2017 ◽  
Vol 24 (12) ◽  
pp. 11265-11278 ◽  
Author(s):  
Bérénice Ranc ◽  
Pierre Faure ◽  
Véronique Croze ◽  
Catherine Lorgeoux ◽  
Marie-Odile Simonnot
Keyword(s):  
Contaminated Soils ◽  
Chemical Oxidation ◽  
Soil Heating ◽  
In Situ Chemical Oxidation

Impacts of Changing Operational Parameters of In Situ Chemical Oxidation (ISCO) on Removal of Aged PAHs from Soil

2012 ◽  
Vol 15 (2) ◽  
Author(s):  
Paula Cajal-Mariñosa ◽  
Ruth G. de la Calle ◽  
F. Javier Rivas ◽  
Tuula Tuhkanen
Keyword(s):  
Hydrogen Peroxide ◽  
Removal Efficiency ◽  
Contaminated Soil ◽  
Chemical Oxidation ◽  
Contaminant Removal ◽  
Operational Parameters ◽  
In Situ Chemical Oxidation ◽  
Different Types ◽  
Wood Impregnation

AbstractThe removal efficiency of two different types of peroxide addition, catalyzed hydrogen peroxide (CHP) and sodium percarbonate (SPC) were compared on a highly PAH-contaminated soil from a wood impregnation site. In an attempt to simulate real in situ reagents delivery, experiments have been carried out in acrylic columns. The main parameters affecting contaminant removal were the reagent’s temperature and the total addition of peroxide (g

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