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The electrochemical oxidation decolorization of the azo dye wastewater containing Acid Red G (5-acetylamino-4- hydroxy-3-phenylazo-naphthalene-2,7-disulfonic sodium) was investigated. The effect of the operating parameters, such as applied voltage, dye concentration, electrolyte concentration and temperature, on the dye wastewater decolorization efficiency was analyzed. The reaction dynamics equation...
In this study, a combined treating process (neutralization, electrolysis, ozone oxidization, coagulation and cinder adsorption) was introduced to investigate the possibility of degradation of concentrated azo dye wastewater. The optimum operation parameters were obtained through small-scale bench tests and pilot-scale tests, and then were put into operation. The experimental results showed that the...
Research on treatment for chloride of desulphurization wastewater by nano-TiO2 is conducted and based on nano-TiO2 dioxide characteristics of adsorption and photo-catalysis. Some affecting factors on the removal efficiency were also studied, such as different dosage, mixing time, pH value of the solution and light time. The catalysis mechanisms of nano-TiO2 on chloride removal efficiency were discussed...
In order to reach a bigger NO2-/NO3- value in post-processing of biological shortcut nitrification, the pretreatment of the ammoniac wastewater was carried out using TiO2 photo-catalysis, and the optimizing reaction conditions were obtained. The results showed that after TiO2 pretreatment the NO2-/NO3- value in the wastewater was greater than 2 through adjusting the pH value of reaction solution,...
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...
A kind of improved bio-ecological combination process with high efficiency and low energy consumption for municipal wastewater treatment was put forward in this article. Based on the comparison and analysis of treatment efficiency and energy consumption with other treatment methods, conclusions had summed up that the effluent quality indexes of improved process reached the first level A criteria specified...
A set of batch assays was used to assess the characteristics of ammonium oxidation, nitrite and nitrate reduction by heterotrophic nitrifier of Bacillus sp. LY. Bacillus sp. LY is not only a heterotrophic nitrifier, but is also an aerobic denitrifier, and shows a surprising ability of aerobic nitrification- denitrification for nitrogen removal. C/N 15 and 30degC were the optimal conditions for aerobic...
The shortcut nitrification was realized in a sequencing batch reactor (SBR) when the temperature and pH value were controlled at 28~30degC and 7.8~8.1. The nitrogen removal loading reached 0.129 kg NH4+-Nldrkg-1 VSSldrd-1 by increasing the influent ammonia concentration. More than 85% of the nitrite accumulative efficiency was achieved and the ratio of ammonium oxidation bacteria to nitrite oxidation...
This paper suggests a technological process to oxidize stench sulfide wastewater containing dodecyl mercaptan with electrolyzing NaCl in the presence of active carbon. Preliminary experiments were conducted and good results were obtained. Under the condition that electrolyzing 30 g/L NaCl with certain current and the reaction temperature remains 20degC and the reaction time lasts 10~30 s, the stench...
A new process of enhanced dissolved air floatation (DAF) by pulsed high voltage discharge was studied in this paper. With high voltage discharges, removal rate of some normal water quality indexes were better improved, such as UV254 and CODMn from 0.145 to 0.142 and from 6.2 mg/L to 5.8 mg/L. The turbidity of water after treated with pulsed high voltage discharges was larger than that without discharges...
Chemical treatment of nisin fermentation wastewater (NFW) by Fenton oxidation (FO) process was studied. The influences of H2O2/COD ratio (w/w), Fe2+/H2O2 molar ratio, pH, temperature and reaction time were experimentally studied in a batch reactor. The optimal operating conditions for Fenton process were found to be at H2O2CVCOD ratio (w/w) of 2.0, Fe2+/H2O2 molar ratio of 0.15, pH of 3.5, temperature...
This paper investigated the effect of ammonia-nitrogen to the removal of phenol by electrochemical oxidation in the Chloride System. The electrode of RuO2-Pt/Ti was used as the anode and a Ti plate as the cathode. The results of cyclic voltammetry experiments showed that the RuO2-Pt/Ti anode had no effect of the direct oxidation for both phenol and ammonia- nitrogen, which suggested that the intermediate...
The photodegradation of acetic acid was carried out in the presence of UV/H2O2. The degradation rate was strongly influenced by pH, the intensity of light and initial concentration of acetic acid and H2O2. The effect of anions HCO3-, Cl-, NO3-, SO42- and cations Fe2+, Cu2+, Mn2+ in aqueous solution was also studied . An initial acetic acid concentration of 8 mmol/L was almost completely degraded...
The electrochemical oxidation of imazethapyr at Ti/SnO2-Sb2O5/PbO2 electrode was investigated by cyclic voltammetry, and the oxidation mechanism of imazethapyr was primarily studied in this paper . Sodium sulfate was used as the electrolyte of the substrate solutions. The experimental results of cyclic voltammetry show that acidic media is suitable for efficient electrochemical oxidation of imazethapyr...
Platinum catalysts on activated carbon (AC) were developed and examined for the removal of organic pollutants from wastewater. The Pt/AC2 catalysts were more active than the Pt/ACl and Pt/AC3. With the analysis of BET, XPS and SEM, it was found that the quantities of oxygen containing groups on the AC surface increased after AC supports were pre-treated by oxidant, and farther the dispersion of Pt...
In order to optimize the population structure of nitrifying bacteria, several factors were analyzed in this paper to make partial nitrification start up. Lab-scale SBR was employed to treat the domestic wastewater of low COD/TN ratio. Steady partial nitrification can be achieved through real-time control in 32 cycles with dissolved oxygen (DO) 1.8plusmn0.1 mg/L and SRT 7 days at 30degC. The nitrite...
La-doped TiO2/Ti photoelectrodes were prepared by anodization and characterized by SEM, XRD, XPS and UV/VIS/NIR. Photoelectrocatalytic (PEC) performance of La-doped TiO2/Ti photoelectrodes under visible light irradiation was tested. The results of these experiments showed that La-doped TiO2/Ti photoelectrodes prepared under voltage of 160 V, the current density of 100 mA/cm2, La(NO3)3 concentration...
A kinds of Methamidophos wastewater was pretreated by acidification and Fenton oxidation process, and the results demonstrated that, at pH value of 2.0 and reaction temperature 100degC, a removal efficiency of TOC and sulfide of was reached to 18.33% and 90.7% respectively, at pH value of 4.0, n(H2O2):n (Fe2+) of 30 and 3.0% of H2O2, that of TOC was reached to about 24.3%, while at addition of 20%...
The ozonizing-biological aerated filter (BAF) process was used to treat the port chemical cabin washing wastewater . According to the characteristics of port chemical cabin washing wastewater with high CODcr, variable quality and complicated composition, the initial pH, the dosage of ozone and catalyzer, the bio-degrade ability of the wastewater, and effect of the hydraulic retention time (HRT) of...
The orthogonal test was used to study the bactericidal capability of potassium ferrate and its influencing factors for bacteria and Escherichia coli when potassium ferrate is playing coagulation effect in treating micro-polluted water. The results showed that the order of the primary and secondary factors affecting the germicidal efficacy of potassium ferrate was oxidation time, reagent amount and...
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