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Chemical oxygen demand (COD) has been the crucially problematic parameters in refinery wastewater treatment. This study was conducted to investigate COD removal in refinery wastewater with Fenton process. The effects of pH value, H2O2 dosage, the mole ratio of Fe2+ to H2O2, oxidation time and oxidation temperature on COD removal were discussed. The results showed that COD removal efficiency first...
A combined process, demulsification-Fenton oxidation-coagulation, has been employed to treat a sort of high-strength and stable emulsion wastewater produced from a machinery factory. The influences of demulsifier species, dosage of Fenton reagents, oxidation reaction time and pH of coagulation have been investigated. The results indicate that AlCl3 is the most effective demulsifier and the optimal...
The effects of UV-Fenton preoxidation on the biodegradability of several phenolic wastewaters were investigated based on the ratio of BOD5/COD. The results showed that the BOD5/COD ratios of phenol, hydroquinone, 2-chlorophenol and coal-gas phenolic wastewater were less than 0.30, except for phenol in moderate concentration of 300mg/L, which mean that the phenolic wastewaters were difficultly biodegradable...
The UV-Fenton treatment of formaldehyde (HCHO) was studied in a batch photochemical reactor. This is based on the purpose to reveal the reaction rules of HCHO as an intermediate product in the degradation of many other kinds of organic wastewater. The oxidation course can be divided into rapid reaction stage, transition stage and slow reaction stage. The effects of Fe2+, H2O2 concentration and the...
Photo-Fenton reaction is a kind of advanced oxidation technology based on the reaction of hydroxyl radical. In order to further enhance the photocatalytic efficiency, with citric acid as the catalytic additive, and malachite green as the substrate, experiments on the photocatalytic oxidation of organic pollutants in UV/Fenton/Citric acid system were carried out. Effect of Fe(II) concentration, initial...
Polymer Si-Fe (PSF) coagulant was prepared by co-polymerization. The oxidization of PSF was investigated by using jar test for humic acid (HA) solution sample and measuring oxidization-reduction potential (ORP) compared with that of polyferric aluminum (PFA). The results show that PSF has higher ORP value than PFA, with the difference of 420mV. PSF is an oxidization coagulant that possibly changes...
In this paper, advanced oxidation process utilizing Fenton's reagent was investigated for degradation of the C.I. Acid Blue 9 from aqueous solution. Some important operation parameters, such as pH value of solutions, iron and hydrogen peroxide concentration, temperature and presence/absence of chloride ion, which effect on the decolorization of the C.I. Acid Blue 9 from aqueous solution by Fenton...
In this paper, pretreating p-tertt-butylphenol formaldehyde resin synthesized wastewater has been carried out by the combined techniques of the ferric-carbon micro-electrolysis (abbreviated as FCME) and the Fenton reaction. The result shows that when the COD of the wastewater is between 3350~8370mg/L, pH=2.0 and the reaction time of FCME is 120 minute, the removal of COD is above 48% though the FCME...
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...
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...
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...
In this paper a process of combining internal electrolysis and Fenton was used to pre-treat acrylic fiber wastewater based on investigating the optimization parameters of internal electrolysis and Fenton oxidization. Four kinds of combining processes were studied. Results showed that both the processes of Fenton oxidization next to internal electrolysis and internal electrolysis coupled Fenton oxidization...
A new kind of flocculants, named Polymer Silicate Phosphate Ferrous Sulfate(PSPFS), was synthesized with ferrous sulfate as main material and silicate and phosphate as additive. The influencing factors and synthesis technology of PSPFS were determined by studying the treatment of high-viscosity oil petrification wastewater of Liaohe Pertrochemical Corporation. The influencing factors level were determined,...
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...
Even though iron salts are widely used in waterand wastewater treatment, many questionssurrounding the use of this element remain.Issues surrounding the impact of mixingconditions on floc structure and strength, theeffect of reduction of ferric iron species onanaerobic sludge properties (includingdewatering) and the possible options for choiceof ligand in the modified photo-Fenton processfor contaminant...
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