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The ion adsorption of cobalt (2+) on the oxide sorbents with different concentrations of the ions of Co2+ and pH has been experimentally studied. The acid-base model of adsorption, which makes it possible to optimize the technological regimes of the adsorption of Co2+ on the inorganic sorbents (Co2O3, TiO2, Fe2O3, Fe3O4, SiO2 and other) has been proposed. The special feature of model is calculation...
The effect of process parameters (pH, pulp density, inoculum volume of the nutrient medium, silver content) on the rate of copper solubilization was analyzed respectively through silver-catalyzed bioleaching experiments with microorganisms in shake flasks. These results show that the optimal process parameters are: pulp density, 2.5 wt%; silver content, 10mg/L; pH, 1.50-1.80; inoculum volume of the...
PBS (flyash-based coagulant) made by fly ash in coal-fired thermal power plants and blast furnace iron sludge extracted with a dilute H2SO4 was used as coagulant in the treatment of tanning wastewater. The influence of pH value, coagulant dosage and temperature on coagulation effect was investigated. The results showed that this coagulant had satisfactory results to treat tanning wastewater under...
In this paper, the synergetic action of UV-Fenton catalytic oxidation and nano-TiO2 photocatalytic to treat Azocarmine G dye wastewater was researched. The results show that the best conditions for the treatment of 250mL Azocarmine G dye wastewater are: the dosage of 30% H2O2 is 1mL; the dosage of 0.1mol/L FeSO4·7H2O is 3mL; the dosage of nano- TiO2 is 1g; pH is 4; illumination distance is 21cm. In...
A simple method for the determination of hydroxyl radical was established to screen the antioxidant substances and evaluate their antioxidation ability. In this paper, effect of pH on absorption spectrum of dyes, the optimal experimental condition of the fading reaction, the kinetics of degradation of dyes by Fenton oxidation, the relationship between the molecular structure of dyes and reaction rate,...
The deposition of needle-shaped cuprous oxide (Cu2O) particles (20~50 nm) on chitosan nanoparticles were made by anodic oxidation of copper electrode in alkaline solution, Fe2+ was immobilized by chitosan nanoparticles with chelating. Chitosan-Fe2+/Cu2O were used as an immobilized Fenton reagent activated by visible light at biocompatible pH values(pH≈7-8) in the degradation of brilliant red X-3B...
Manganese-oxidizing microorganisms are able to oxidize soluble Mn2+ into insoluble Mn oxides, so they are very useful in treatment of Mn-contaminated water. A strain bacteria Mn-103 was isolated, purified from manganese removal bio-filter treated, and it had been identified to belong to Bacillus ce-1 by the MIDI Sherlock bacteria identification system. The strain bacteria has the manganeseoxidizing...
The Fenton reagent was used for the treatment of high concentration organic wastewater from production of plastic abrasives. The effect of reaction time, pH value, dosage of H2O2, the mol ratio between H2O2 and Fe2+, reaction temperature and adding ways of H2O2 on COD removal efficiency was studied. The mechanism of the affecting factors was also analyzed. The optimal operational condition was determined...
The decolorization of Reactive Red K-2BP wastewater with sponge iron in a fixed-bed column system was evaluated at different influent water qualities (pH, dye concentration), particle diameter of sponge iron and filtrate rate. The decolorization efficiencies at influent pH of 6 were superior to those at influent pH of 5 and 7.5. The decolorization efficiency decreased with increments of filtration...
Nanoscale zero-valent iron (NZVI) was synthesized in the laboratory for the removal of As(III) (arsenite) and As(V) (arsenate). Average BET surface areas of the particles was 49.16 m2/g, with diameter in the range of 20-40 nm. Batch and column experiments were conducted to investigate adsorption kinetics and efficiency of arsenic removal with NZVI. The results showed that both arsenate and arsenite...
Investigations were carried out to determine the effect of the pH, the nitrogen source, iron and the dilution rate (h −1 ) on fermentative hydrogen production from glucose by the newly isolated strain Citrobacter freundii CWBI952. The hydrogen production rate (HPR), hydrogen yield, biomass and soluble metabolites were monitored at 30°C in 100mL serum bottles and in a 2.3L bioreactor operated...
FePO4??2H2O precursor was synthesized from FePO4??7H2O, NH4H2PO4, NH3??H2O and H2O2 as the oxidizing agent by solution precipitation route. Effects of reaction conditions, such as solution concentration, reaction temperature, stirring speed, adding amount of H2O2, pH and drying time on synthesis of FePO4??2H2O precursor were studied. Afterwards, Li2CO3, FePO4??2H2O and glucose were ground by wet process...
The decolorization of Reactive Red K-2BP wastewater with sponge iron was investigated through batch experiments. The decolorization process appeared to a pseudo-first order reaction. The observed first-order rate constants (kobs) varied from 0.087 to 0.033 /min with the dye concentration from 50 to 300 mg/l at 50 g/l sponge iron loading , and half-lives (t1/2) varied from 7.97 to 21 min. The decolorization...
Catalytic degradation of simulated 2,4-dichlorophenol wastewater are investigated by using self-synthesized Fe/activated carbon (AC) catalysts and hydrogen peroxide oxidation agent. Effects of the most relevant operating conditions(pH, catalysts concentration, 2,4-dichlorophenol concentration, H2O2 concentration and reaction temperature) were discussed. The results indicate that the degradation rate...
Membrane-making wastewater contains DMF, with high COD, toxicity and non-biodegradability. In this work, aerobic Fe-C micro-electrolysis and three-dimensional electrodes technology were applied for the pretreatment aiming to improve the biodegradability of the wastewater. It was found that the optional pretreatment conditions were pH 3 for Fe-C micro-electrolysis and pH 5 for the three-dimensional...
The influence of Fe-deficiency on exudation of low molecular weight organic acids (LMWOAs) were investigated based on the hydroponic culture experiment. Tartaric, citric, malic, and acetic acids were chosen as representatives of LMWOAs commonly present in roots exudation. We also investigated the influence of Fe-deficiency on pH of rhizosphere. The results showed that Fe-deficient excreted large amounts...
The heterogeneous photo-Fenton-type oxidation of sodium pentachlorophenate (PCP-Na) has been studied in this paper using artificial ultraviolet as a light source. Iron loaded chelating resin has been used as a heterogeneous catalyst in the process. The effects of pH, illumination time, concentration of H2O2, quality of iron loaded chelate resin and initial concentration of PCP-Na on the degradation...
Aim of this study was to investigate the effects of initial pH and current density on phosphate removal from source separated urine by electrocoagulation using iron electrodes. Results show that while the initial pH was at 6 and the current density was 50 mA/cm2, nearly 100% of phosphate could be removed from urine after being electrolyzed for 15 minutes under the operation conditions as the gap between...
Microbial community compositions and functional activities of three acid mine drainage (AMD) sediment samples from different sites in Dexing copper mine were analyzed by 50- mer oligonucleotide arrays which have been constructed and evaluated. The results showed that microbial community was composed of 15 different genus or species, including Acidithiobacillus ferrooxidans(A. ferrooxidans), Leptospirillum...
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