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Abstract-Wastewater from cyanidation leaching of gold from ore, coal coking, and electroplating processes contains high concentration of thiocyanate, an anionic toxin of particular concern to aquatic environments. This study investigated potential use of electron beam radiolysis of thiocyanate in aqueous solution. Results showed that in 500 mg/L thiocyanate solution with pH of 7 and 12, as irradiation...
In this study, according to the specific characteristics of acrylonitrile wastewater, Effective Microorganisms (EM) was used as Contact oxidation strain. The optimum conditions of EM bacteria domestication and contact oxidation treatment, such as pH, concentration and temperature, was confirmed. In addition, the results of aerobic treatment of wastewater suggested that COD effluent reduced to below...
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 very effective combined process that included flocculation, oxidation, CRMO-coagulation and adsorption was studied in reactive dye wastewater treatment. The results showed that the total removal efficiencies of COD and colourity were 98.1% and 99.9% respectively. The process was characterized with operation flexibility and reliability and the equipment simplicity. It could widely be applied in reactive...
Method for simultaneous analyzing the residual of PAEs & PAHs in municipal wastewater by solid phase extraction coupled with gas chromatography was established. The proposed methods were used for the analysis of 16 PAHs & 6 PAEs of the municipal wastewater in Xi'an. NAPT, ACNY, ACEN, FLUR, PHEN, DMP, ANTH, PYR, DEP, DEHP, DBP, and BBP were quite frequently observed in influent. The analytes...
Experiments were carried out to study the effects of peak voltage and gap width on ozone generated by proper high frequency and high voltage power supply. The results show that the corona inception voltage are 4100 V, 6500 V and 8040 V when the gap width are 1 mm, 2 mm and 3 mm, respectively. The highest volume fraction and production efficiency of ozone are 24.55×10-3 and 134 g/kWh with a gap width...
Transpiring wall reactor is a promising engineering solution to corrosion and salt precipitation for the technology of supercritical water oxidation. Characteristics of flow conditions and species concentrations in the reactor and around the transpiring wall are hardly accessible to measurements. So a computational fluid dynamic model of the transpiring wall reactor was developed. The influence of...
The methylene blue dye wastewater was treated by various amount of hydroxyl Fe modified bentonite, then, the dye was oxidized by the bentonite with the Fe catalysis. As a result the modified bentonite was regenerated and could be recycled in adsorption. Ultrasound and hydrogen peroxide have synergistic action on degradation of methylene blue for OH-Fe-bentonites' regeneration. The adsorption of dye...
Ruthenium supported on active carbon-ceramic sphere as catalysts were evaluated through the catalytic wet air oxidation (CWAO) of resin effluent in a packed-bed reactor. Active carbon-ceramic sphere supported ruthenium catalysts were prepared using the RuCl3 solution impregnation onto these supports, the ruthenium loading was fixed at 3 wt. % of AC in the support. The activity order of catalysts:...
It is discussed the preparation of potassium ferrate (VI) salts and the process of preparation of potassium ferrate by electrochemical method, and probed into characteristics in the process of oxidation by single ingredient experiments. The experiments were used to study factors of proportion under different conditions as follows, potassium ferrate (VI) salts dosing, the beginning pH of p-nitrophenol...
A series of urban wastewater in one WWTP of Xi'an, China was picked to investigate the mechanism of representative heavy metals removal by the wastewater treatment plant (WWTP). Under determine the six different heavy metals(Cu, Zn, Mn, Cr, Hg, As) and SS concentrations of the effluent of the fine screen, sand chamber, oxidation ditch and secondary sedimentation settler, it is wished to find the kinetics...
In order to evaluate the electrolytic decomposition process of ammonia, the effects of current density and chloride ion were investigated. The Ti/RuO2- Pt electrode was used as the anode, and Ti electrode as the cathode. The current densities, of 5mA/cm2, 10mA/cm2, and 15mA/cm2, were applied during electrolysis. It was indicated that the ammonia-nitrogen removal efficiency increased with the current...
Lead dioxide catalyzed cathode (PbO2) which has high overpotential and electrode potential with low cost was tested in microbial fuel cells (MFCs) for sulfide removal in this study, compared with traditional platinum based carbon cathode (Pt/C). The maximum power density of 997.26±20.20 mW/m2 was realized, with sulfide removal efficiency as high as 88.73±4.37%, both showing advantage to Pt/C cathode...
To determine if anaerobic microniches are created in granular sludge exposed to oxygen where the refractory organics reduction in coking wastewater could occur and to assay the feasibility of the highly efficiently and stable operation of the micro-aerobic EGSB reactor for simultaneous removal of COD and NH3-N treating actual coking wastewater at 25-30°C, both anaerobic and microaerobic operations...
A combined process of aeration iron-carbon microelectrolysis(AICM)-hydrolysis acidification-anaerobic-aerobic was studied to treat pharmaceutical wastewater characterized by high nitrogen and refractory organic concentration. Results showed that when the AICM filter was controlled at the conditions of pH 3, iron-carbon ratio 1, gas-water ratio 10 and HRT 2h, the HRT of two-stage hydrolysis acidification,...
Supercritical(sub-critical) water oxidation technology is applied to degrade the explosive wastewater and low its chemical oxygen demand (COD). The technology optimum and reaction dynamics of TNT, RDX, HMX degradation have been investigated. The experiment results show that the optimum degradation technology is: reaction temperature T=648K, reaction time t=5min, the volume proportion of waste water...
The present work deals with the study of uptake behaviour of Cd(II), Pb(II), Hg(II) and Zn(II) ions by chemically synthesized poly(p-Bromoanaline) PPBrAN using batch equilibration technique with both single and binary mixtures. The PPBrAN were chemically synthesized in different HCl concentrations. The effect of the various parameters such as synthesis method, physical oxidation state of the polymer,...
This paper suggests a technological process to oxidize stench sulfide wastewater containing dodecyl mercaptan with electrolyzing Na2SO4 in the presence of active carbon. Preliminary experiments were conducted and good results were obtained. Under the condition that electrolyzing 1%(m/V)Na2SO4 with 1A current and the reaction temperature remains 30 and the reaction time lasts 10 ~ 30 s, the stench...
The best experimental factors were achieved through the single factor experiment and orthogonal experiment. When the initial concentration of formaldehyde was 120mg/L, reaction time was 30 minutes and the ratio between amount of sodium bisulfite and formaldehyde was 3:1, the removal rate of formaldehyde was approximately up to 100%, which fully satisfied the national emission standards (the concentration...
Supercritical water oxidation (SCWO) was first proposed almost 20 years ago as a potential organic waste treatment technology. In this paper, the energy-conversion system of supercritical water oxidation is built up in terms of a transpiring-wall reactor, in which the glucose-water solution is used to mimic the organic liquid-waste. Additionally, considering mass and energy conservations, the calculation...
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