Effects of pH Manipulation, Biological Reduction, and Plant Growth on Cu2+and Zn2+Removal from Mine Drainage Using Iron-Oxide-Enriched Red Earth Soils

2014 ◽  
Vol 42 (9) ◽  
pp. 1272-1279 ◽  
Author(s):  
Youchi Zhang ◽  
Chaohua Hu ◽  
Wensui Luo
Keyword(s):  
Iron Oxide ◽  
Plant Growth ◽  
Mine Drainage ◽  
Biological Reduction ◽  
Effects Of Ph ◽  
Red Earth

Mechanisms and Remediation Technologies of Sulfate Removal from Acid Mine Drainage

2012 ◽  
Vol 610-613 ◽  
pp. 3252-3256
Author(s):  
Mei Qin Chen ◽  
Feng Ji Wu
Keyword(s):  
Heavy Metals ◽  
Acid Mine Drainage ◽  
Mine Drainage ◽  
Metal Corrosion ◽  
Sulfate Ion ◽  
High Concentration ◽  
Biological Reduction ◽  
Acid Mine ◽  
Sulfate Removal ◽  
Co Precipitation

Acid mine drainage (AMD) has properties of extreme acidification, quantities of sulfate and elevated levels of soluble heavy metals. It was a widespread environmental problem that caused adverse effects to the qualities of ground water and surface water. In the past decades, most of investigations were focused on the heavy metals as their toxicities for human and animals. As another main constitution of AMD, sulfate ion is nontoxic, yet high concentration of sulfate ion can cause many problems such as soil acidification, metal corrosion and health problems. More attention should be paid on the sulfate ion when people focus on the AMD. In the paper, sulfate removal mechanisms include adsorption, precipitation, co-precipitation and biological reduction were analyzed and summarized. Meanwhile, the remediation technologies, especially the applications of them in China were also presented and discussed.

Zinc and iron oxide nanoparticles improved the plant growth and reduced the oxidative stress and cadmium concentration in wheat

Chemosphere ◽  
2019 ◽  
Vol 214 ◽  
pp. 269-277 ◽  
Author(s):  
Muhammad Rizwan ◽  
Shafaqat Ali ◽  
Basharat Ali ◽  
Muhammad Adrees ◽  
Muhammad Arshad ◽  
...  
Keyword(s):  
Oxidative Stress ◽  
Iron Oxide ◽  
Plant Growth ◽  
Iron Oxide Nanoparticles ◽  
Cadmium Concentration ◽  
Oxide Nanoparticles

scholarly journals Estimating Arsenic Mobility and Phytotoxicity Using Two Different Phosphorous Fertilizer Release Rates in Soil

Agronomy ◽  
2019 ◽  
Vol 9 (3) ◽  
pp. 111 ◽  
Author(s):  
Min-Suk Kim ◽  
Hyun-Gi Min ◽  
Jeong-Gyu Kim ◽  
Sang-Ryong Lee
Keyword(s):  
Acid Mine Drainage ◽  
Plant Growth ◽  
Contaminated Soil ◽  
Mine Drainage ◽  
Water Soluble ◽  
Single Treatment ◽  
Bone Meal ◽  
Acid Mine ◽  
Phytotoxicity Test ◽  
P Fertilizer

Deficiencies in phosphorus (P), an essential factor for plant growth and aided phytostabilization, are commonly observed in soil, especially near mining areas. The objective of this study was to compare the effect of P-based fertilizer types on arsenic (As) extractability and phytotoxicity in As-contaminated soil after stabilizer treatment. Different treatments with respect to the P-releasing characteristics were applied to soil to determine As mobility and phytotoxicity in P-based fertilizers, with bone meal as a slow-releasing P fertilizer and fused superphosphate as a fast-releasing P fertilizer. In addition, P fertilizers were used to enhance plant growth, and two types of iron (Fe)-based stabilizers (steel slang and acid mine drainage sludge) were also used to reduce As mobility in As-contaminated soil under lab-scale conditions. A water-soluble extraction was conducted to determine As and P extractability. A phytotoxicity test using bok choy (Brassica campestris L. ssp. chinensis Jusl.) was performed to assess the elongation and accumulation of As and P. Within a single treatment, the As stabilization was higher in steel slag (84%) than in acid mine drainage sludge (27%), and the P supply effect was higher in fused superphosphate (24740%) than in bone meal (160%) compared to the control. However, a large dose of fused superphosphate (2%) increased not only the water-soluble P, but also the water-soluble As, and consequently, increased As uptake by bok choy roots, leading to phytotoxicity. In combined treatments, the tendency towards change was similar to that of the single treatment, but the degree of change was decreased compared to the single treatment, thereby decreasing the risk of phytotoxicity. In particular, the toxicity observed in the fused superphosphate treatments did not appear in the bone meal treatment, but rather the growth enhancement effect appeared. These results indicate that the simultaneous application of bone meal and stabilizers might be proposed and could effectively increase plant growth via the stabilization of As and supplementation with P over the long term.

Adsorption of Arsenic from Aqueous Solutions by Iron Oxide Coated Sand Fabricated with Acid Mine Drainage

2015 ◽  
Vol 50 (2) ◽  
pp. 267-275 ◽  
Author(s):  
Jung-Seok Yang ◽  
Man Jae Kwon ◽  
Young-Tae Park ◽  
Jaeyoung Choi
Keyword(s):  
Iron Oxide ◽  
Acid Mine Drainage ◽  
Aqueous Solutions ◽  
Mine Drainage ◽  
Acid Mine ◽  
Coated Sand

THE EFFECTS OF pH ON STRUCTURAL AND OPTICAL CHARACTERIZATION OF IRON OXIDE THIN FILMS

2016 ◽  
Vol 24 (04) ◽  
pp. 1750051 ◽  
Author(s):  
FATMA MEYDANERİ TEZEL ◽  
OSMAN ÖZDEMİR ◽  
İ. AFŞIN KARİPER
Keyword(s):  
Thin Films ◽  
Iron Oxide ◽  
Refraction Index ◽  
Index Formula ◽  
Solution Temperature ◽  
Oxide Thin Films ◽  
Glass Substrates ◽  
Effects Of Ph ◽  
Crystallite Sizes ◽  
Cbd Method

In this study, the iron oxide thin films have been produced by chemical bath deposition (CBD) method as a function of pH onto amorphous glass substrates. The surface images of the films were investigated with scanning electron microscope (SEM). The crystal structures, orientation of crystallization, crystallite sizes, and dislocation density i.e. structural properties of the thin films were analyzed with X-ray diffraction (XRD). The optical band gap ([Formula: see text], optical transmission ([Formula: see text]%), reflectivity ([Formula: see text]%), absorption coefficient ([Formula: see text], refraction index ([Formula: see text]), extinction coefficient ([Formula: see text]) and dielectric constant ([Formula: see text]) of the thin films were investigated depending on pH, deposition time, solution temperature, substrate temperature, thickness of the films by UV–VIS spectrometer.

scholarly journals A comparative study on psychrophilic and mesophilic biooxidation of ferrous iron by pure cultures of Acidithiobacillus ferrooxidans and Acidithiobacillus ferrivorans

2020 ◽  
Vol 99 (3) ◽  
pp. 128-133
Author(s):  
K.N. Seitkamal ◽  
◽  
Nariman Zhappar ◽  
Valerij Shaikhutdinov ◽  
Aigerim Shibaуeva ◽  
...  
Keyword(s):  
Acidithiobacillus Ferrooxidans ◽  
Ferrous Sulfate ◽  
Ferrous Iron ◽  
Mine Drainage ◽  
Important Process ◽  
Sulphide Ores ◽  
Initial Ph ◽  
Effects Of Ph ◽  
Pure Cultures ◽  
Shake Flasks

Biological oxidation of ferrous sulfate by Acidithiobacillus ferrooxidans and Acidithiobacillus ferrivoransis an important process in the bioleaching of minerals and the treatment of acid mine drainage. The rate at which biooxidation reactions take place is directly related to the microorganisms’growth temperature. Decreasing the temperature of reaction causes both a decrease on the chemical reactions rates and a decrease on bacterial growth. In this study, the effects of pH and temperatures on oxidation of ferrous sulfate by a native At. ferrooxidans and At. ferrivorans strains were investigated. The biooxidation tests conducted in shake flasks at 28 °C and 8 °C and at initial pH 1.6 for 5 days. During the experiment, the mesophilic iron oxidizers were capable of growing on ferrous iron at concentrations of 4.5 g/L at low and optimum temperature. However, the rate of mesophilic biooxidation of ferrous iron was higher than that observed in the psychrophilic biooxidation. In conclusion, during the experiment the At. ferrivorans strain 535 showed high activity in oxidizing at low temperature than other strains. It means even at very low temperatures, microorganisms play an important role in the oxidation and leaching of sulphide ores.

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