Manganese Removal from Electrolytic Manganese Residue Using Ozone

This paper deals with experimental investigations related to removal of manganese (II) from electrolytic manganese residues by using ozone as oxidant. Ozone was used in this study to oxidize manganese converting bivalent manganese to high valence states, the oxidized salts will precipitate as manganese oxides, that to reach the concentration of the pollutant under its limit values in water. Effects of reaction temperature, reaction contact time and initial pH value on the manganese (II) removal were investigated. The results indicated that the removal rate exceeded 99.9 percent, and the manganese (II) in solution was lower than 0.1 mg·L-1 under the conditions of reaction temperature 45 °C, reaction contact time 40 min and initial pH 12.

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Radioactivity of Five Typical General Industrial Solid Wastes and its Influence in Solid Waste Recycling

Minerals ◽

10.3390/min9030168 ◽

2019 ◽

Vol 9 (3) ◽

pp. 168 ◽

Cited By ~ 2

Author(s):

Zhihui Shen ◽

Qin Zhang ◽

Wei Cheng ◽

Qianlin Chen

Keyword(s):

Solid Waste ◽

Building Materials ◽

Absorbed Dose ◽

Waste Recycling ◽

Solid Wastes ◽

Radium Equivalent Activity ◽

Limit Values ◽

Industrial Solid Waste ◽

Electrolytic Manganese ◽

Electrolytic Manganese Residue

The level of radionuclides is an important index for the preparation of building materials from industrial solid waste. In order to investigate the radiological hazard of five kinds of typical general industrial solid wastes in Guizhou, China, including fly ash (FA), red mud (RM), phosphorus slag (PS), phosphogypsum (PG), and electrolytic manganese residue (EMR), the radiation intensity and associated radiological impact were studied. The results show that concentrations of 238U, 235U, 232Th, 226Ra, 210Pb, and 40K for different samples vary widely. The concentration of 238U was both positively correlated with 235U and 226Ra, and the uranium contents in the measured samples were all of natural origin. The radiation levels of PG, EMR, EMR-Na (EMR activated by NaOH), and EMR-Ca (EMR activated by Ca(OH)2) were all lower than the Chinese and the world’s recommended highest levels for materials allowed to be directly used as building materials. The values of the internal and external illumination index (IRa and Iγ, respectively) for FA and RM were higher (IRa > 1.0 and Iγ > 1.3 for FA, IRa > 2.0 and Iγ > 2.0 for RM). The radium equivalent activity (Raeq), indoor and outdoor absorbed dose (Din and Dout, respectively), and corresponding annual effective dose rate (Ein and Eout) of RM, PS, and FA were higher than the recommended limit values (i.e., 370 Bq/kg, 84 nGy/h, 59 nGy/h, 0.4 mSv/y, and 0.07 mSv/y, respectively), resulting from the higher relative contribution of 226Ra and 232Th. The portion of RM, FA, and PS in building materials should be less than 75.44%, 29.72%, and 66.01%, respectively. This study provides quantitative analysis for the safe utilization of FA, RM, PS, PG, and EMR in Guizhou building materials.

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Application of annealed red mud to Mn2+ ion adsorption from aqueous solution

Water Science & Technology ◽

10.2166/wst.2016.139 ◽

2016 ◽

Vol 73 (11) ◽

pp. 2761-2771 ◽

Cited By ~ 5

Author(s):

Hongliang Chen ◽

Juan Zheng ◽

Zhongqiong Zhang ◽

Qian Long ◽

Qiuyun Zhang

Keyword(s):

Aqueous Solution ◽

Red Mud ◽

Freundlich Isotherm ◽

Physicochemical Characteristics ◽

Point Of Zero Charge ◽

Maximum Adsorption Capacity ◽

Adsorption Effect ◽

Electrolytic Manganese ◽

Electrolytic Manganese Residue ◽

Initial Ph

Physicochemical characteristics and Mn2+ adsorption of annealed red mud were investigated in this study. The annealing temperature (105–900 °C) changed the mineralogical components and the point of zero charge of red mud. By comparison, annealed red mud at 700 °C (ARM700) had a better adsorption effect than other annealed samples, associated with the activated components of available Fe2O3, Al2O3, SiO2 and Na5Al3(SiO4)3CO3 (natrodavyne). The removal efficiency of Mn2+ by ARM700 was dependent on initial pH, contact time, and initial Mn2+ concentration of aqueous solution and was ∼56.5% with initial Mn2+ concentration 385 mg/L at initial pH > 5. The kinetics process was predicted better by the pseudo-second-order model. The Langmuir isotherm displayed a better fitting model than the Freundlich isotherm and the Mn2+ maximum adsorption capacity of ARM700 was 88.3 mg/g. The competing effects of Cu2+ and Zn2+ on Mn2+ removal were most obvious. There was efficient Mn2+ removal at the application of ARM700 to the leachate of electrolytic manganese residue.

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Removal of Ammonium from Aqueous Solutions Using Zeolite Synthesized from Electrolytic Manganese Residue

International Journal of Chemical Engineering ◽

10.1155/2020/8818455 ◽

2020 ◽

Vol 2020 ◽

pp. 1-14

Author(s):

Changxin Li ◽

Yuan Yu ◽

Qingwu Zhang ◽

Hong Zhong ◽

Shuai Wang

Keyword(s):

Aqueous Solutions ◽

Contact Time ◽

Ammonium Uptake ◽

Ammonium Concentration ◽

Order Kinetic ◽

Uptake Capacity ◽

Principal Mechanism ◽

Electrolytic Manganese ◽

Electrolytic Manganese Residue ◽

Ammonium Adsorption

This paper carried out the study on removal of ammonium from aqueous solutions by zeolite derived from electrolytic manganese residue (EMR) via a fusion method. The variables of pH, contact time, EMRZ (EMR-based zeolite) dosage, initial ammonium concentration, and competitive cations and anions on the ammonium uptake capacity were systematically investigated in an attempt to illustrate adsorption performance of EMRZ. The results show that these influence factors had a remarkable impact on the ammonium uptake capacity of EMRZ. Maximum ammonium uptake capacity was achieved at pH value 8.0, EMRZ dosage 0.2 g/100 mL, contact time 100 min, initial ammonium concentration 200 mg/L, and temperature 35°C. Under optimized conditions, ammonium uptake capacity onto EMRZ was up to 27.89 mg/g. The competitive degree of cations in ammonium adsorption process follows the sequence of Na+>K+>Ca2+>Mg2+, and the sequence of anion effect on ammonium removal onto EMRZ is CO32− > Cl− > SO42− > PO43−. The adsorption kinetic was explored and best represented by pseudo-second-order kinetic model. And the adsorption isotherm experimental data had best fitness with the Freundlich and Koble–Corrigan model, suggesting that heterogeneous uptake was the principal mechanism adopted in the process of ammonium adsorption. Moreover, calculation of thermodynamic parameters such as change in free energy (ΔG), enthalpy (ΔH), and entropy (ΔS) was carried out and it was determined to be −15.77∼−14.03 kJ·mol−1, +37.66 kJ·mol−1, and +173.38 J·mol−1·K−1, respectively. These parameters confirmed that ammonium uptake onto EMRZ was an endothermic and spontaneous process. Moreover, no obvious deterioration tendency was observed for the regenerated EMRZ compared with fresh EMRZ. These results indicate that EMRZ has wide application prospects in removing ammonium from wastewater.

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Adsorption of Volatile Phenol in Coking Wastewater by Diatomite

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.573-574.648 ◽

2012 ◽

Vol 573-574 ◽

pp. 648-653

Author(s):

Qi Yuan Gu ◽

Gen Wu ◽

Xi Ning Lu

Keyword(s):

Reaction Temperature ◽

Contact Time ◽

Removal Rate ◽

Phenol Removal ◽

High Concentration ◽

Phenol Adsorption ◽

Volatile Phenol ◽

Organic Pollutants Removal ◽

Alkaline Conditions ◽

Pollutants Removal

Coal process wastewater that discharged from coal conversion processes usually contains volatile phenol in high concentration. As a natural mineral, diatomite demonstrates its excellent adsorption performance especially in organic pollutants removal. Diatomite was used for phenol removal in cokingwastewater by adsorption and the effect of diatomite dosage, contact time, salinity, intitial pH conditon and reaction temperature were investigated. It was observed that the removal rate of phenol increased with an increase in the diatomite dosage and contact time. The solution salinity could inhibit the phenol adsorption onto diatomite slightly by cometitive adsorption. Alkaline conditions were especially favorable for phenol removal. The increased reaction temperature could improve phenol adsorption to a large extent as well.

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Study on Catalytic Wet Oxidation of H-Acid Containing Water over Fe/SiO2 Catalyst

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.641-642.281 ◽

2013 ◽

Vol 641-642 ◽

pp. 281-284

Author(s):

Hong Ya Li ◽

Bin Xia Zhao ◽

Wei Li Bai ◽

Xiao Li Zhang

Keyword(s):

Hydrogen Peroxide ◽

Reaction Temperature ◽

Ph Value ◽

Removal Rate ◽

Disulfonic Acid ◽

Peroxide Oxidation ◽

Catalytic Wet Oxidation ◽

Hydrogen Peroxide Oxidation ◽

Initial Ph ◽

Catalyst Dosage

This study has investigated the degradation of H-acid (1-amino-8-naphthol-3, 6-disulfonic acid) containing water by catalytic wet hydrogen peroxide oxidation method, in which the catalyst of Fe/SiO2 was prepared by impregnation technology. The effect of catalyst dosage, initial pH value, amount of hydrogen peroxide and reaction temperature on the degradation process have been discussed, and the results indicated that wet hydrogen peroxide oxidation is an effective method for treating the wastewater containing H-acid, under the conditions that: catalyst dosage was 2 g, initial pH value was 7, amount of hydrogen peroxide was 10 mL (0.83 time of theoretical required amount) and reaction temperature was 80 °C, the COD and color removal rate can reach 87.3% and 96.5%, respectively.

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Advanced Treatment of Biochemical Treated Coking Wastewater by Ozonation Process

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.726-731.2515 ◽

2013 ◽

Vol 726-731 ◽

pp. 2515-2520 ◽

Cited By ~ 1

Author(s):

De Min Yang ◽

Jian Mei Yuan

Keyword(s):

Reaction Time ◽

Reaction Temperature ◽

Ozone Concentration ◽

Ph Value ◽

Removal Rate ◽

Color Removal ◽

Advanced Treatment ◽

Coking Wastewater ◽

Initial Ph ◽

Ozonation Process

Advanced treatment of biochemical treated coking wastewater was studied experimentally with ozonation process. The effects of initial pH value, ozone concentration, reaction temperature, and reaction time on the COD and color removal rate were investigated. The results showed that ozonation was an effective method for advanced treatment of biochemical treated coking wastewater. The increasing of initial pH value, ozone concentration, reaction temperature, and reaction time has enhanced the removal rate of COD and color. Meanwhile, the results also revealed that the maximal COD and color removal rate of 69.65% and 92.27% could be reached under the optimal conditions of the initial pH value is 10.5, ozone concentration is 150 mg/L, reaction temperature is 298 K, and reaction time is 30 min.

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Experimental Study on Cr6+ Adsorption in Water about the Daily Waste Peanut Shell

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.690-693.1003 ◽

2013 ◽

Vol 690-693 ◽

pp. 1003-1007

Author(s):

Chao Jin Wang ◽

Tai Hang Li ◽

Ling Lu Tang ◽

Zhou Zou ◽

Wen Ji Liu ◽

...

Keyword(s):

Experimental Study ◽

Contact Area ◽

Contact Time ◽

Ph Value ◽

Removal Rate ◽

Peanut Shell ◽

Adsorption Effect ◽

Adsorption Time ◽

Initial Ph ◽

Over Time

The peanut shell was used as the adsorbent of Cr6+ in this paper. A series experiences have been discussed and studied through the following three aspects, which were the adsorption time, modification effect and contact area. The results showed that the peanut shell for the removal rate of Cr6+ presented increasing tendency over time. In condition of 25°C, 1.0g unmodified peanut shell,50mL 30mg·L-1 Cr6+ solution, the initial pH value 1.0 and contact time 300min, the adsorption rate of Cr6+ was only 71%. In the same conditions, the removal rate of modified peanut shell was 75%, compared to the unmodified increasing by 4%. Thus modified treatment for peanut shell has no significant effect on the adsorption effect. And In condition of 25°C, 50mL 30mg·L-1 Cr6+ solution, the initial pH value 1.0 and contact time 270min, the removal rate of 1.0g modified peanut shell was 75%, but the modified peanut shell powders removal rate was 99%, representing an increase of 25% before crushing, thus to increase the contact area can improve the adsorption effect.

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Removal of 2,4,6-Trichlorophenol by Iron and Manganese Oxides / Granular Activated Carbon with H2O2

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.154-155.28 ◽

2010 ◽

Vol 154-155 ◽

pp. 28-33 ◽

Cited By ~ 1

Author(s):

Zhen Zhong Liu ◽

Hui Ping Deng ◽

Zhan Li Chen

Keyword(s):

Activated Carbon ◽

Manganese Oxides ◽

Removal Rate ◽

Granular Activated Carbon ◽

Carbon Composite ◽

X Ray Diffraction ◽

Freundlich Isotherms ◽

Initial Ph ◽

Coprecipitation Route ◽

Iron And Manganese

Iron and manganese oxides/granular activated carbon composite (GACFM) was prepared via a chemical coprecipitation route, followed by a heat treatment at elevated temperature. The as–prepared GACFM was characterized by X-ray diffraction (XRD) and infrared spectroscopy (FTIR). The main iron and manganese oxides actually present in the composites were mainly composed of Fe3O4 ,Mn3O4 and (FeO)x(MnO)1-x. The adsorption and catalytic properties of GACFM and some conditions effects such as H2O2, pH , temperature and CO32- were studied for the removal of 2,4,6-trichlorophenol (TCP) from aqueous medium. The adsorption of TCP on GACFM obeyed the Freundlich isotherms. When the initial concentration of H2O2 was 0.4mg/L , 5mg/L TCP removal rate was maximum on the GACFM. The treatment of TCP could be carried out at initial pH under 7.0. CO32- can scavenge •OH in solution and decreased TCP removal. In the whole, GACFM was satisfactory absorbent and catalyst for the removal of chlorophenol from water.

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