In-Situ Remediation of Heavy Metals in Sewage Sludge Using Some Pesticides and Inorganic Amendments

2015 ◽  
Vol 55 (4) ◽  
pp. 453-462
Keyword(s):  
Heavy Metals ◽  
Sewage Sludge ◽  
In Situ Remediation ◽  
Inorganic Amendments

Evaluation of fly ash, apatite and rice straw derived-biochar in varying combinations for in situ remediation of soils contaminated with multiple heavy metals

2020 ◽  
Vol 66 (2) ◽  
pp. 379-388
Author(s):  
Van Minh Dang ◽  
Huu Tap Van ◽  
Hoa Thi Minh Duong ◽  
Duy Hai Nguyen ◽  
Huan-Ping Chao ◽  
...  
Keyword(s):  
Heavy Metals ◽  
Fly Ash ◽  
Rice Straw ◽  
In Situ Remediation ◽  
Multiple Heavy Metals

scholarly journals Effective Amendments on Cadmium, Arsenic, Chromium and Lead Contaminated Paddy Soil for Rice Safety

Agronomy ◽  
2020 ◽  
Vol 10 (3) ◽  
pp. 359
Author(s):  
Aman Ullah ◽  
Yibing Ma ◽  
Jumei Li ◽  
Nazia Tahir ◽  
Babar Hussain
Keyword(s):  
Heavy Metals ◽  
Iron Oxide ◽  
Soil Amendments ◽  
Cost Effective ◽  
Paddy Soils ◽  
In Situ Remediation ◽  
Metals And Metalloids ◽  
Rice Plants ◽  
Heavy Metals And Metalloids

Contamination of paddy soils with heavy metals and metalloids poses a risk to human health through the food chain. For safe agricultural production in contaminated paddy soils, “in situ” remediation through the unavailability of heavy metals from contaminated soils was investigated in order to develop cost-effective and eco-friendly approaches for soils contaminated with complexed heavy metals (HMs) and metalloids. In the present study, the effectiveness of different soil amendments, including sulfur-containing materials (hair or cysteine), manganese compounds as an antagonist and an oxidant, zeolite and iron oxide as adsorbents, and their combinations through coating or modification, was investigated by a pot experiment with rice plants and chemical analysis. Two levels of each treatment were made, termed X1 and X2, which were a single and double dose of each treatment respectively, while CaCO3 was used as a basal and pH enhancement amendment in all treatments to identify the best combination of the above treatments in the in situ remediation of heavy metals and metalloids. The rice plants were kept under the flooded condition. Results indicated that the bioavailability of As, Cd, Cr, and Pb in soil was significantly decreased with level two (X2) of iron oxide coated with modified hairs (T7X2) followed by level two (X2) of zeolite coated with KMnO4. The iron oxide coated with modified hairs (X2) decreased the concentrations of heavy metals and metalloids in rice plants in the order Pb ˃ As ˃ Cr ˃ Cd by 81%, 80%, 79% and 46%, respectively, followed by zeolite coated with KMnO4 (X2) in the order Pb ˃ As ˃ Cr ˃ Cd by 78%, 76%, 71%, and 31%, respectively, to control. The available content of these elements in soil was decreased in the order As > Cr> Pb > Cd by 67%, 66%, 64% and 60%, respectively, through iron oxide coated with modified hairs, followed by zeolite coated with KMnO4 in the order Pb ˃ Cr ˃ Cd ˃ As by 57%, 53%, 50%, and 46%, respectively, to control, which can explain the decreased bioavailability by these amendments. In addition, the maximum shoot dry and leaf area were noticed in the pots treated with iron oxide coated with modified hairs and zeolite coated with KMnO4. There is potential to use modified hairs (MHs) with iron oxide and KMnO4-coated zeolite as soil amendments to develop a cost-effective and efficient “in situ” remediation technology for As, Cd, Pb, and Cr-contaminated rice paddy soils, especially for the soils with complex contamination by Cd and As.

scholarly journals Coupled Electrokinetics-Adsorption Technique for Simultaneous Removal of Heavy Metals and Organics from Saline-Sodic Soil

2013 ◽  
Vol 2013 ◽  
pp. 1-9 ◽  
Author(s):  
Salihu Lukman ◽  
Mohammed Hussain Essa ◽  
Nuhu Dalhat Mu'azu ◽  
Alaadin Bukhari
Keyword(s):  
Heavy Metals ◽  
Contaminated Soils ◽  
Contaminant Removal ◽  
In Situ Remediation ◽  
Sodic Soils ◽  
Sodic Soil ◽  
Mixed Contaminants ◽  
Removal Of Heavy Metals ◽  
Promising Solution

In situ remediation technologies for contaminated soils are faced with significant technical challenges when the contaminated soil has low permeability. Popular traditional technologies are rendered ineffective due to the difficulty encountered in accessing the contaminants as well as when employed in settings where the soil contains mixed contaminants such as petroleum hydrocarbons, heavy metals, and polar organics. In this study, an integrated in situ remediation technique that couples electrokinetics with adsorption, using locally produced granular activated carbon from date palm pits in the treatment zones that are installed directly to bracket the contaminated soils at bench-scale, is investigated. Natural saline-sodic soil, spiked with contaminant mixture (kerosene, phenol, Cr, Cd, Cu, Zn, Pb, and Hg), was used in this study to investigate the efficiency of contaminant removal. For the 21-day period of continuous electrokinetics-adsorption experimental run, efficiency for the removal of Zn, Pb, Cu, Cd, Cr, Hg, phenol, and kerosene was found to reach 26.8, 55.8, 41.0, 34.4, 75.9, 92.49, 100.0, and 49.8%, respectively. The results obtained suggest that integrating adsorption into electrokinetic technology is a promising solution for removal of contaminant mixture from saline-sodic soils.

scholarly journals Chromium(VI) Heavy Metal Biosorption in Citarum River Water Sample Using Saccharomyces cerevisiae and Rhizopus oryzae Biomass

2020 ◽  
Vol 8 (2) ◽  
pp. 119
Author(s):  
Suci Rizki Nurul Aeni ◽  
Ni'matul Murtafi'ah ◽  
Handarini Handarini
Keyword(s):  
Heavy Metals ◽  
Saccharomyces Cerevisiae ◽  
Heavy Metal ◽  
River Water ◽  
Rhizopus Oryzae ◽  
In Situ Remediation ◽  
Standard Curve ◽  
Chromium Vi ◽  
Metal Biosorption

The Citarum River was regarded as the World’s dirtiest river in 2018, characterized by a Basin situated adjacent to several textile and electroplating industries. Hexavalent chromium metal (Cr6+) is a toxic, carcinogenic heavy metal found in the wastes of these industries. Furthermore, biosorption with biological adsorbents, including Saccharomyces cerevisiae and Rhizopus oryzae, is an alternative method for treating water polluted with heavy metals. This study therefore aims to adsorb Cr6 + heavy metals from Citarum River water using S. cerevisiae and R. oryzae biomass in two locations: Nanjung and Pangauban, with various biomass concentrations and stirring speeds. For this study, 0.25, 0.5, and 0.75 g of R. oryzae suspension, as well as 250, 500, and 750 µ of S. cerevisiae were used as adsorbent, while rotated at speeds of 250 rpm, 750 rpm and 1500 rpm. Subsequently, the Cr6 + metal content was measured using a UV-Vis spectrophotometer at a wavelength of 525 nm, and calculated based on a standard curve. The results showed S. cerevisiae and R. oryzae are able to reduce the levels of Cr6+ in Citarum river water. The most reduction was obtained with the highest concentration of the adsorbents, 750 µ for S. cerevisiae and 0.75 g for R. oryzae, at the speed of 1500 rpm. S. cerevisiae and R. oryzae have great potential as biosorbents for the in situ remediation of Citarum River contaminated with heavy metals.

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