Mobilization of heavy metals from contaminated paddy soil by EDDS, EDTA, and elemental sulfur

2007 ◽  
Vol 29 (3) ◽  
pp. 221-235 ◽  
Author(s):  
Guoqing Wang ◽  
Gerwin F. Koopmans ◽  
Jing Song ◽  
Erwin J. M. Temminghoff ◽  
Yongming Luo ◽  
...  
Keyword(s):  
Heavy Metals ◽  
Paddy Soil ◽  
Elemental Sulfur ◽  
Contaminated Paddy Soil

scholarly journals Remediation of arsenic-contaminated paddy soil: Effects of elemental sulfur and gypsum fertilizer application

2021 ◽  
Vol 223 ◽  
pp. 112606
Author(s):  
Dengxiao Zhang ◽  
Guanghui Du ◽  
Wenjing Zhang ◽  
Ya Gao ◽  
Hongbin Jie ◽  
...  
Keyword(s):  
Paddy Soil ◽  
Elemental Sulfur ◽  
Fertilizer Application ◽  
Soil Effects ◽  
Contaminated Paddy Soil

Effects of Biochar Amendment on the Dynamics of Enzyme Activities from a Paddy Soil Polluted by Heavy Metals

2012 ◽  
Vol 610-613 ◽  
pp. 2129-2133 ◽  
Author(s):  
Yage Yang ◽  
Jin Long Yan ◽  
Cheng Ding
Keyword(s):  
Heavy Metals ◽  
Soil Ph ◽  
Paddy Soil ◽  
Enzyme Activities ◽  
Physicochemical Analysis ◽  
Soil Enzyme ◽  
Soil Enzyme Activities ◽  
Undisturbed Soil ◽  
Agricultural Use ◽  
Contaminated Paddy Soil

Reducing heavy metals mobility and improve the soil physical-chemical property in order to reduce plant uptake would be an urgent demand for safe rice production in China. A field experiment was conducted for the research of biochar (BC) amendment on the dynamics of soil enzyme activities in a contaminated paddy soil after 2 years. BC was applied in 2009 before rice transplantation at rates of 0, 10, 20, 40 t ha-1, and three undisturbed soil cores of 0 to 15 cm depth were sampled from each plot for physicochemical analysis and enzymatic monitoring. Compared to the control, the soil pH and SOC were significantly increased by 2–5 % and 16–51 % after BC amendment. The activities of cellulase, urine enzyme, neutral phosphatase and sucrase were also found to increase by 117.4–178.3 %, 31.1–37.6 %, 29.7–193.8 % and 36.5–328.6 %, respectively. Furthermore, there were positive correlation of soil enzyme activities with soil pH and SOC content. Data in this research indicated that BC amendment may be potential in improvement of soil properties to some extent to achieve the agricultural use. Introduction

Biolixiviation des métaux lourds et stabilisation des boues d'épuration : essai en bioréacteur opéré en mode cuvée

1993 ◽  
Vol 20 (1) ◽  
pp. 57-64 ◽  
Author(s):  
R. D. Tyagi ◽  
J. F. Blais ◽  
N. Meunier ◽  
D. Kluepfel
Keyword(s):  
Heavy Metals ◽  
Sewage Sludge ◽  
Suspended Solids ◽  
Elemental Sulfur ◽  
Batch Reactor ◽  
Fecal Coliforms ◽  
Sludge Stabilization ◽  
Sludge Digestion ◽  
Batch Time ◽  
Phosphorus And Potassium

A biological process of heavy metals solubilization and sewage sludge stabilization was studied in a batch reactor of 30-L capacity. The acclimatized leaching microflora was composed of two major groups of thiobacilli: less acidophilic and acidophilic. A batch time of 10 days allows a substantial metal solubilization: cadmium (100%), copper (80%), manganese (80%), nickel (46%), and zinc (100%). The bioleaching process also causes a significative decrease in sludge total suspended solids (25%) and volatile suspended solids (32%), and a considerable reduction (under the detection limit of 10 cfu∙mL−1) of indicator bacteria (total coliforms, fecal coliforms, fecal streptococci). After filtration or centrifugation of the leached sludge, the solubilized metals were precipitated by lime neutralization. The phosphorus and potassium sludge contents were not affected by bioleaching process. These results indicate that the process of sludge digestion and metal leaching can be conducted in parallel in the same reactor. Key words: sewage sludge, heavy metals, bioleaching, stabilization, thiobacilli, elemental sulfur.

Evolution of Compositions and Contents of Capsule and Slime EPSs for Adaptation to and Action on Energy Substrates and Heavy Metals by Typical Bioleaching Microorganisms

2017 ◽  
Vol 262 ◽  
pp. 466-470 ◽  
Author(s):  
Zhen Yuan Nie ◽  
Hong Chang Liu ◽  
Jin Lan Xia ◽  
Huan Liu ◽  
Yun Lu Cui ◽  
...  
Keyword(s):  
Heavy Metals ◽  
Heavy Metal Ions ◽  
Elemental Sulfur ◽  
Uronic Acids ◽  
Energy Substrates ◽  
Inorganic Matter ◽  
Acidianus Manzaensis ◽  
First Time ◽  
Extracellular Polymer ◽  
Mineral Interaction

Adaption to the energy substrates and heavy metals by bioleaching micoorganisms is the prerequisite for efficient microbe-mineral interaction in bioleaching process. It is known extracellular polymer substances (EPSs) take important role in mediating the adaption to and action on energy substrates and heavy metals. This report presents the evolution of compositions and contents of the major components of EPSs of the typical bioleaching microorganisms (Acidithiobacillus ferrooxidans, Leptospirillum ferriphilum, Sulfobacillus thermosulfidooxidans, and Acidianus manzaensis,) exposed to different energy substrates and heavy metal ions. These strains were acclimated firstly to Fe2+ substrate, and then on the substrates elemental sulfur (S0), pyrite and chalcopyrite, respectively. It was found that the major components of capsule and slime EPSs in terms of proteins, polysaccharides, as well as uronic acids were quite different in contents for the Fe2+-acclimated strains, and they even changed more when the Fe2+-acclimated strains were further acclimated to the other substrates. When exposed to heavy metals, all strains demonstrated much decrease in contents of capsule EPSs, and much increase in slime EPSs contents and the heavy metals were found to bound to the slime parts. It was for the first time the EPSs of the bioleaching strains were fractionated into capsule part and slime part, and it was also for the first time we found the differences in evolution of compositions and contents of the major organic components as well as the inorganic matter of capsule EPSs and slime EPSs when the bioleaching strains were exposed to different energy substrates and heavy metals.

Remediation of arsenic-contaminated paddy soil by iron-modified biochar

2018 ◽  
Vol 25 (21) ◽  
pp. 20792-20801 ◽  
Author(s):  
Chuan Wu ◽  
MengQian Cui ◽  
ShengGuo Xue ◽  
WaiChin Li ◽  
Liu Huang ◽  
...  
Keyword(s):  
Paddy Soil ◽  
Modified Biochar ◽  
Contaminated Paddy Soil
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