EVALUATION OF COMBINED FENTON OXIDATION AND CHEMICAL PRECIPITATION PROCESS PERFORMANCE IN CYANIDE REMOVAL FROM AQUEOUS SOLUTION

2017 ◽  
Vol 16 (9) ◽  
pp. 1873-1880
Author(s):  
Somayeh Golbaz ◽  
Ahmad Jonidi Jafari ◽  
Mohammad Rafiee ◽  
Roshanak Rezaei Kalantary
Keyword(s):  
Aqueous Solution ◽  
Chemical Precipitation ◽  
Fenton Oxidation ◽  
Precipitation Process ◽  
Process Performance ◽  
Cyanide Removal

Photocatalytic Activity of Gd3+ and Sm3+ Co-Doped BiVO4 Powders Prepared by Chemical Precipitation Process

2012 ◽  
Vol 508 ◽  
pp. 259-262 ◽  
Author(s):  
Cheng Zhi Jiang ◽  
Rui Yang ◽  
Sen Bai ◽  
Xu Dong Lu
Keyword(s):  
Aqueous Solution ◽  
Methylene Blue ◽  
Photocatalytic Activity ◽  
Photocatalytic Degradation ◽  
Degradation Rate ◽  
Chemical Precipitation ◽  
Chemical Precipitation Method ◽  
Precipitation Method ◽  
Precipitation Process ◽  
Co Doped

Pure BiVO4, single doped and co-doped BiVO4 have been prepared by chemical precipitation method and characterized by the techniques such as XRD and SEM/EDAX. The photocatalytic degradation of methylene blue (MB) in aqueous solution was used as a probe reaction to evaluate pure BiVO4, single doped BiVO4 and co-doped BiVO4 photocatalytic activity. The results show that doping of single doped and co-doped significantly enhance the photocatalytic activity of BiVO4. When the 0.1%Gd3+ and 0.2%Sm co-doped, the BiVO4 degradation rate reaches 91%.

scholarly journals Investigation of Cyanide Removal from Aqueous Solution Using Precipitation Process (FeCl3)

2013 ◽  
Vol 2 (1) ◽  
pp. 39-46
Author(s):  
A. Jonidi Jafari ◽  
S. Golbaz ◽  
R. Rezaei Kalantari ◽  
◽  
◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Precipitation Process ◽  
Cyanide Removal

Photocatalytic Activity of Sm-Doped BiVO4 Powders Prepared by Chemical Precipitation Process

2011 ◽  
Vol 391-392 ◽  
pp. 1283-1286
Author(s):  
Cheng Zhi Jiang ◽  
Xu Dong Lu ◽  
Yan Qiu Tan ◽  
Sen Bai
Keyword(s):  
Aqueous Solution ◽  
Methylene Blue ◽  
Photocatalytic Activity ◽  
Photocatalytic Degradation ◽  
Degradation Rate ◽  
Chemical Precipitation ◽  
Nano Particles ◽  
Chemical Precipitation Method ◽  
Precipitation Method ◽  
Precipitation Process

Pure BiVO4, Sm doped BiVO4have been prepared by chemical precipitation method and characterized by the techniques such as XRD and SEM. The photocatalytic degradation of methylene blue (MB) in aqueous solution was used as a probe reaction to evaluate pure BiVO4, Sm doped BiVO4photocatalytic activity. The results show that doping of Sm decreases the diameter of BiVO4 nano-particles and significantly enhance the photocatalytic activity of BiVO4. When the 0.2% Sm doped, the BiVO4degradation rate reaches 92.8%.

Stabilization of Hazardous Materials into Ferrites

1991 ◽  
Vol 23 (1-3) ◽  
pp. 399-404 ◽  
Author(s):  
Y. Tamaura ◽  
P. Q. Tu ◽  
S. Rojarayanont ◽  
H. Abe
Keyword(s):  
Aqueous Solution ◽  
Heavy Metal ◽  
Metal Ions ◽  
Present Method ◽  
Hazardous Materials ◽  
Precipitation Process ◽  
Waste Waters ◽  
Formation Reaction ◽  
Coating Method ◽  
Hazardous Metal

Stabilization of the hazardous materials by the Fe3O4-coating method was studied. In the ferrite-formation reaction in the aqueous solution, the adsorption of the metal ions and the oxidation of the adsorbed Fe(II) ions are repeated on the surface of the ferrite particles. This reaction was adopted to the coating of the hazardous materials with the Fe3O4(or ferrite). By repeating the two steps of l)the addition of the Fe(II) aqueous solution into the suspension of the hazardous materials, and 2)the oxidation by passing air through the reaction suspension, with the Fe3O4 layer, we could coat the surfaces of the hazardous materials, such as the heavy metal sludge from the neutralization-precipitation process, the CaF2 precipitates in the treatment of the waste waters containing fluoride ion along with hazardous metal ions, and the soils containing Cd(II) ion. These Fe3O4-coated hazardous materials are very stable and no heavy metal ions are leached under the normal environmental conditions. The ferrite sludges formed in the “Ferrite Process” were highly stabilized by the present method, and by the heat-treatment.

Performance Stability of Small Biological Chemical Treatment Plants

1990 ◽  
Vol 22 (3-4) ◽  
pp. 275-282
Author(s):  
R. Storhaug
Keyword(s):  
Activated Sludge ◽  
Chemical Treatment ◽  
Chemical Precipitation ◽  
Poor Quality ◽  
Precipitation Process ◽  
Chemical Plants ◽  
Effluent Standards ◽  
Main Portion ◽  
Rotating Biological Contactors ◽  
Number Of Treatment

Biological and chemical treatment plants constitute a main portion of the overall number of treatment plants in Norway. The biological and chemical plants are divided into three process groups, simultaneous precipitation and activated sludge, combined precipitation and rotating biological contactors (RBC) and post precipitation and activated sludge. Aluminium sulphate or ferric chloride are the commonly used flocculants in the chemical precipitation process. Effluent data from 174 Norwegian biological chemical treatment plants are evaluated. Compared to the effluent standards for each process group, post precipitation shows the best performance. On an average these plants have the lowest actual utilization of the design capacity. The most important factors that cause the treatment plants not to meet the effluent standards are, poor quality of the sewer system, improper design of the plant and organizational problems. Satisfactory separation of particles, flow equalization and proper operational management, are the basic demands to achieve low effluent concentrations for tot-P and BOD7.

Phosphorus removal from aqueous solution using a novel granular material developed from building waste

2017 ◽  
Vol 75 (6) ◽  
pp. 1500-1511 ◽  
Author(s):  
Shengjiong Yang ◽  
Pengkang Jin ◽  
Xiaochang C. Wang ◽  
Qionghua Zhang ◽  
Xiaotian Chen
Keyword(s):  
Granular Material ◽  
Chemical Precipitation ◽  
Phosphate Removal ◽  
Precipitation Process ◽  
Order Kinetic ◽  
Solution Ph ◽  
Experimental Conditions ◽  
Removal Capacity ◽  
Order Kinetic Model ◽  
Pseudo Second Order

In this study, a granular material (GM) developed from building waste was used for phosphate removal from phosphorus-containing wastewater. Batch experiments were executed to investigate the phosphate removal capacity of this material. The mechanism of removal proved to be a chemical precipitation process. The characteristics of the material and resulting precipitates, the kinetics of the precipitation and Ca2+ liberation processes, and the effects of dosage and pH were investigated. The phosphate precipitation and Ca2+ liberation processes were both well described by a pseudo-second-order kinetic model. A maximum precipitation capacity of 0.51 ± 0.06 mg g−1 and a liberation capacity of 6.79 ± 0.77 mg g−1 were measured under the experimental conditions. The processes reached equilibrium in 60 min. The initial solution pH strongly affected phosphate removal under extreme conditions (pH <4 and pH >10). The precipitates comprised hydroxyapatite and brushite. This novel GM can be considered a promising material for phosphate removal from wastewater.

Optimization for the removal of orthophosphate from aqueous solution by chemical precipitation using ferrous chloride

2014 ◽  
Vol 35 (13) ◽  
pp. 1668-1675 ◽  
Author(s):  
Ju-Suk An ◽  
Ye-Ji Back ◽  
Ki-Chul Kim ◽  
Ran Cha ◽  
Tae-Young Jeong ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Chemical Precipitation ◽  
Ferrous Chloride

scholarly journals Recovery Ion Hg2+ dari Limbah Cair Industri Penambangan Emas Rakyat dengan Metode Presipitasi Sulfida dan Hidroksida

2018 ◽  
Vol 12 (1) ◽  
pp. 23
Author(s):  
Ilma Fadlilah ◽  
Agus Prasetya ◽  
Panut Mulyono
Keyword(s):  
Gold Mining ◽  
Mercury Level ◽  
Liquid Waste ◽  
Treatment Method ◽  
Chemical Precipitation ◽  
Precipitation Method ◽  
Precipitation Process ◽  
Sulphide Precipitation ◽  
Slow Mixing ◽  
Precipitation Formation

Unlicensed gold mining activities (PETI) using mercury (Hg) as a gold element binder is called the amalgamation process. Mercury is a heavy metal toxic. The use of mercury can potentially cause pollution in environment, especially the aquatic environment. For overcoming the heavy metals mercury in liquid waste, it needs an alternative wastewater treatment method called chemical precipitation. This study is aimed to recover Hg2+ ions from liquid wastes by using sulphide precipitation and hydroxide methods. This research studied the effect of pH on Hg ions which is deposited in the precipitation process and found out the rate of Hg precipitation formation. Precipitation was done by using sodium sulphide (Na2S) 0.3 M and Ca(OH)2 0.004 M as a precipitation agent with rapid mixing speed for about 200 rpm for 3 minutes and continued with slow mixing for about 40 rpm for 30 minutes. Then, just let the liquid sample be for 24 hours to precipate the precipitate formed. The results show that precipitation method by using a Na2S solution can decrease the content of Hg in HgCl2 synthetic waste. An optimum  mass of HgS precipitate of  0,0458 g was achieved pH 9 for 200 mL of wastewater liquid with a removal efficiency percentage up to 99.81%. The concentration of mercury can be derived from 130 ppm to 0.25 ppm. The rate of formation of HgS precipitate was obtained 0.0004g/ hour. While, hydroxide precipitation method can decrease mercury level up to 90,11% at pH 12 and mass of Hg (OH)2 precipitate obtained is 0,2784 g. However, the result of EDX analysis of the precipitate of Hg (OH)2 shows that the content of Hg precipitate is just 0.281%.

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