Study on Removal of Iron and Manganese from Mine Water by Method of Medicament

2012 ◽  
Vol 217-219 ◽  
pp. 843-848
Author(s):  
Lei Lei Hou ◽  
Yu Qi Wang ◽  
Tie Gao ◽  
Jia Jing Jiang
Keyword(s):  
Water Quality ◽  
Reaction Time ◽  
Removal Efficiency ◽  
Mine Water ◽  
Room Temperature ◽  
Removal Rate ◽  
Quality Characteristics ◽  
Efficient Removal ◽  
Iron And Manganese

Use single and coexistence of simulated mine water contains Fe2+ and Mn2+ as processing object, the new NWMO medicament on Fe2+ and Mn2+’s removal efficiency, NWMO dosage, pH, reaction time and temperature on NWMO’s removal efficiency were investigated. When treated mine water only contains Fe2+, the appropriate conditions of the factors are that NWMO dosage/Fe2+ content=19:1, pH=5, room temperature, the reaction time is 10min, and the removal rate of Fe2+ is more than 80%; When treated mine water only contains Mn2+, the appropriate conditions of the factors are that NWMO dosage/Mn2+ content=22:1, pH=6, 35°C, the reaction time is 10min, the removal rate of Mn2+ is more than 60%; When the processing of Fe2+ and Mn2+ coexistence of mine water, the appropriate conditions of the factors are that NWMO dosage/Fe2+content=19:1, Fe2+ content/Mn2+ content=5:1, pH=6, 35°C, the reaction time is 10min, the removal rate of Fe2+ can be as high as 100%, and the highest Mn2+ removal rate can amount to 75%. In view of the current mine water quality characteristics that contains Fe2+ and Mn2+, the NWMO medicament is very suitable, and can achieve quick and efficient removal of iron and manganese.

Synthesis of Calcium Peroxide Microparticles in Aqueous at Room Temperature and its Application in Heavy Metal Ions Removal from Waste Liquid of COD Determining

2013 ◽  
Vol 864-867 ◽  
pp. 648-653
Author(s):  
Jian Zhai ◽  
Chun Hua Jiang
Keyword(s):  
Heavy Metal ◽  
Reaction Time ◽  
Removal Efficiency ◽  
Contact Time ◽  
Heavy Metal Ions ◽  
Room Temperature ◽  
Efficient Removal ◽  
Calcium Peroxide ◽  
Heavy Metal Ions Removal ◽  
Metal Ions Removal

The calcium peroxide microparticles were synthesized and evaluated as an innovative oxidant to remove Fe (III) and Cr (III) from waste liquid of COD determining samples. The CaO2 microparticles were 0.1-0.3 μm in diameter and the average CaO2 content was 80%. Experiments were performed to investigate the influence of contact time, pH of solution and CaO2 microparticles dosage on the efficiency of Fe (III) and Cr (III) removal. Up to 100.0% and 99.8% removal efficiency for Fe (III) and Cr (III) respectively was obtained by microparticles dosage of 10000 mg/L at 30 min and pH 7.46. It could be concluded that the removal efficiency was enhanced by increasing CaO2 microparticles dosage and reaction time, but decreased by increasing pH. These results suggest that CaO2 microparticles may be used to develop a simple and efficient removal method for waste liquid of COD determining samples.

Study on De-Nitrification of Improved Step-Feed Progress

2014 ◽  
Vol 703 ◽  
pp. 171-174
Author(s):  
Bing Wang ◽  
Yi Xiao ◽  
Shou Hui Tong ◽  
Lan Fang ◽  
Da Hai You ◽  
...  
Keyword(s):  
Water Quality ◽  
Organic Matter ◽  
Fluidized Bed ◽  
Removal Efficiency ◽  
Nitrogen Removal ◽  
Removal Rate ◽  
Operating Conditions ◽  
Removal Mechanism ◽  
Aerobic Zone

Improved step-feed de-nitrification progress combined with biological fluidized bed was introduced in this study. The progress had good performance and capacity of de-nitrification and organic matter. The experiment result showed that the de-nitrification efficiency of the improved biological fluidized bed with step-feed process was higher than the fluidized bed A/O process under the same water quality and the operating conditions. When the influent proportion of each segment was equal, the system showed good nitrogen removal efficiency with the change of influent C/N ratio, HRT and sludge return ratio. The removal rate of TN reached up to 88.2%. It showed that the simultaneous nitrification and de-nitrification phenomenon happened in the aerobic zone. The nitrogen removal mechanism was also studied.

Interfacial reactions between impurities and slag onset of Si purification by slag addition

2021 ◽  
Vol 119 (1) ◽  
pp. 101
Author(s):  
Yaqiong Li ◽  
Yunlong Yu ◽  
Lifeng Zhang ◽  
Zhengtao Li
Keyword(s):  
Reaction Time ◽  
Removal Efficiency ◽  
Removal Rate ◽  
Interfacial Reactions ◽  
Refining Process ◽  
Short Reaction Time ◽  
Impurity Removal ◽  
Slag Refining ◽  
Al Distribution ◽  
Distribution Behavior

The interfacial reactions between impurities (Al and Ti) and slag onset of Si purification by 51 mol% SiO2–34 mol% CaO–15 mol% MgO slag addition were studied to enhance impurity removal efficiency from Si. The Al distribution behavior at the Si/Slag interface was investigated; a short reaction time (10 s) resulted in the formation of successive SiO2–CaO–MgO–Al2O3 layers in the slag with a thickness of 10 µm; increasing the reaction time (60 s) resulted in the entire ternary slag being changed into SiO2–CaO–MgO–Al2O3 quaternary slag due to the diffusion of Al2O3. It was shown that the highest impurity removal rate of Al could be achieved at the onset of the slag refining process. Based on the Ti distribution at the Si/slag interface, the slag refinement with 51 mol% SiO2–34 mol% CaO–15 mol% MgO had no effect on Ti removal.

Advanced Treatment of Ship Sewage by Fenton-Oxidation Process

2014 ◽  
Vol 1010-1012 ◽  
pp. 595-598
Author(s):  
Gui Fang Liu ◽  
Hong Mei Yan ◽  
Yuan Gao ◽  
Ya Quan Sun ◽  
Yu Ping Zhang
Keyword(s):  
Water Quality ◽  
Reaction Time ◽  
Optimum Condition ◽  
Oxidation Process ◽  
Removal Rate ◽  
Quality Standard ◽  
Fenton Oxidation ◽  
Domestic Water ◽  
Cod Removal Rate ◽  
Fenton Oxidation Process

Fenton-oxidation process was used to treat the simulation ship sewage that had met the requirement of IMO discharge standard. The effects of reaction time, doses of H2O2 and FeSO4, pH and temperature on COD removal rate were investigated. The results showed that the optimum condition for treating simulation ship sewage was as follows: pH=3.0, concentration of H2O2=9 mmol/L, concentration of FeSO4=3 mmol/L, and reaction time=30 min. Under the optimum condition, the removal rate of COD was to 62.7%. The water quality of the effluent could meet Miscellaneous Domestic Water Quality Standard.

Study on the Photocatalytic Degradation of Diesel Pollutants over a Sol-Gel Prepared TiO2

2012 ◽  
Vol 476-478 ◽  
pp. 1926-1929
Author(s):  
Xiao Cai Yu ◽  
Dong Dong Hu ◽  
Qian Du ◽  
Xv Zheng ◽  
Ji Yao Guo
Keyword(s):  
Reaction Time ◽  
Photocatalytic Degradation ◽  
Room Temperature ◽  
Ph Value ◽  
Removal Rate ◽  
Sol Gel ◽  
Initial Concentration ◽  
Five Factors ◽  
Degradation Reaction ◽  
Diesel Degradation

Nanoscale titanium dioxide (TiO2) has been fabricated through a sound sol-gel method at room temperature with Tetra-n-butyl Titanate as the precursor, and the particles are characterized by XRD and TEM techniques. The results manifest that the as-prepared TiO2 is amorphous with the anatase structure and its size is around 33.2nm. Five factors, including dosage of TiO2, initial concentration of diesel, pH value, photocatalytic degradation reaction time and the presence of H2O2, are considered in the diesel degradation experiments. An orthogonal test is carried out to optimize the photocatalytic degradation of diesel pollutants based on the single-factor experiments. It reveals that when the dosage of TiO2 is 1.0g/L, the initial concentration of diesel is 0.5g/L, pH value is 6, the reaction time is 4h and the H2O2 dosage is 0.09%, the removal rate of diesel pollutants can up to 88%. Besides, the influence of each factor on removing diesel can be arranged in decreasing order: initial concentration of diesel> photocatalytic reaction time> pH value> TiO2 dosage> H2O2 dosage.

Study on Treatment of Polytetrahydrofuran Wastewater by Iron-Carbon Micro Electrolysis

2013 ◽  
Vol 295-298 ◽  
pp. 1307-1310
Author(s):  
Xi Tian ◽  
Ming Xin Huo ◽  
De Jun Bian ◽  
Sheng Shu Ai ◽  
Qing Kai Ren
Keyword(s):  
Reaction Time ◽  
Removal Efficiency ◽  
Contact Time ◽  
Ph Value ◽  
Removal Rate ◽  
Volume Ratio ◽  
Cod Removal ◽  
Electrolysis Process ◽  
Cod Removal Efficiency ◽  
Cod Removal Rate

The wastewater produced from the polytetrahydrofuran (PolyTHF) was treated with iron-carbon micro electrolysis process. This paper had studied the COD removal efficiency influences of primary PH value, reaction time, the quality ratio of the iron-carbon, the quality and volume ratio of Fe-wastewater. The results show that when pH value is 3, the quality ratio of the iron-carbon is 11 and the quality and volume ratio of Fe and wastewater is 17 with contact time of 90 min, the wastewater COD removal rate can reach as high as 95.0%.

Study on Advanced Pretreatment of Seawater by Electrolysis

2014 ◽  
Vol 881-883 ◽  
pp. 598-603
Author(s):  
Jing Nie ◽  
Shou Zhi Yi ◽  
Di Miao
Keyword(s):  
Water Quality ◽  
Reverse Osmosis ◽  
Organic Compounds ◽  
Removal Efficiency ◽  
Current Density ◽  
Removal Rate ◽  
Influence Factors ◽  
Operation Time ◽  
Electrode Distance

The advanced pretreatment by electrolysis of Bohai seawater in Tianjin used a diaphragm electrolyzer in the experiment. Removal efficiency and influence factors of the method were analyzed. Results show that turbidity, organic compounds, SDI and chroma of seawater were effectively decreased by electrolysis. Removal efficiency was significantly increased by current density, operation time and inter-electrode distance, and the optimum electrolytic conditions was determined as inter-electrode distance of 2 cm, current density of 15.87 mA·cm-2, operation time of 10 minutes. It was investigated that when the water quality after electrolysis was of pH 8.6, the chroma and turbidity decreasing trend slowed down, with chroma of 0.052 A, removal rate reached 88.4%; the residual turbidity reduced to 2.52 NTU, removal rate reached 90.71%. A PH of about 8.5, CODCr decreasing trend slowed down, and when CODCr < 750 mg/L, it conformed to the requirements of the reverse osmosis water.

Electrochemical Reduction of Nitrate by Fe-Si Alloy Electrode

2011 ◽  
Vol 287-290 ◽  
pp. 1789-1794 ◽  
Author(s):  
Min Li ◽  
Yan Zhi Sun ◽  
Cai Ying Li ◽  
Ping Yu Wan
Keyword(s):  
Reaction Time ◽  
Electrochemical Reduction ◽  
Removal Efficiency ◽  
Current Density ◽  
Electrode Materials ◽  
Removal Rate ◽  
Three Dimensional ◽  
Electrochemical Catalysis ◽  
Test Conditions ◽  
Permeable Electrode

The present paper studies the removal of the nitrogen in the form of nitrate in water by electrochemical catalysis reduction. The influence of electrode materials and various test conditions on the removal efficiency was studied. The experimental results show that the removal rate of nitrate can reach above 90% by using a three-dimensional permeable electrode of Fe-Si alloy under the condition of flowrate of 600ml/h, current density of 10mA/cm2and reaction time of 2h.

Research on the Effect of Coagulation on Decolorization and Degradation of Red Dye Wastewater

2012 ◽  
Vol 610-613 ◽  
pp. 2401-2404
Author(s):  
Yu Ping Tian ◽  
Shen Pan Chen
Keyword(s):  
Reaction Time ◽  
Room Temperature ◽  
Ph Value ◽  
Removal Rate ◽  
Dye Wastewater ◽  
Red Dye

The simulated dye wastewater of direct fast scarlet was disposed of by the coagulant of FeSO4. The effects of reaction time, the original pH value, coagulant dosages and temperature were discussed. The results showed that, at room temperature, the original pH was 7.9, the FeSO4 dosage was 1.2 g / L, then after stirring for 15mins, the coagulation effect was the most obvious, and the removal rate of chroma achieved 95.3%.

Treatment of Organic Compounds in Radioactive Wastewater by Ozonation

2013 ◽  
Vol 726-731 ◽  
pp. 2604-2608
Author(s):  
Ying Hong Xiang ◽  
Yang Yang Zhong ◽  
Xiang Dong Li ◽  
Jun Ke Song
Keyword(s):  
Reaction Time ◽  
Organic Compounds ◽  
Removal Efficiency ◽  
Ph Value ◽  
Removal Rate ◽  
Alkaline Condition ◽  
Radioactive Wastewater ◽  
Oxidation Technology ◽  
Cod Removal Rate ◽  
Influence Of Ph

The organic compounds in radioactive wastewater were treated using ozone oxidation technology. The influence of pH, ozone dosage, reaction time, initial COD, H2O2 on the removal of COD by ozone was investigated. The results showed that the removal efficiency of COD in the alkaline condition was higher than that of acidic condition, the COD removal rate increased with increasing ozone dosage, reaction time, H2O2 dosage, decreased with increasing initial COD. Under the conditions of COD 362 mg/L, pH value 9.0, ozone dosage 7.86 mg•L-1•min-1, reaction time 30 min , the removal rate of COD was 25.9%; the removal rate of COD increased to 37.8% when 0.2 ml H2O2 was added in addition.

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