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This thesis is based on Heishizi landfill lechate treatment, contrapose its limitation, and aim at optimizing Without Biomass Retention Sequential Intensified Pretreatment Reactor's functional parameter and inproving treatment efficiency. Conclusions can be drew that: with HRT's droping, ammonia nitrogen removal rate decrease, and TN removal rate is highest in case of HRT=5.3d; ammonia nitrogen removal...
The effect of inorganic ions on Fenton's reagent to degrade phenol in water is studied. Experimental results show that ferric ions can enhance the catalyst-oxidation ability of Fenton's reagent. Phosphate,chloride ions, copper ions and carbonate ions will suppress the catalyst-oxidation ability, and the inhibition ability of ions is: H2PO4->;Cl- >;Cu2+>;HCO3-~CO32-.For the ions of sulfate...
The removal of flotation reagent butyl xanthate by catalytic ozonation process using Mn-Ce-Al2O3 as catalyst was investigated. The effects of initial pH value, ozone dosage, catalyst loading, initial solution concentration, different process on butyl xanthate removal ratio were carried out. There action mechanism of Mn-Ce-Al2O3 for butyl xanthate was discussed by adding tert-butyl alcohol. The stability...
The study was carried out to evaluate the feasibility of microwave irradiation-Fenton oxidation coupling coagulation process to treat the industrial dyeing wastewater. Batch experiments were performed to investigate effects of various experimental parameters such as H2O2 concentration (3.6-8.4g/L), FeSO4·7H2O concentration (0.06-0.14g/L), microwave power (100-1000W), microwave irradiation time (0...
In order to study the dewatering characteristics and efficiency of thickening low concentration excess sludge by Cavitation Air Floatation(CAF), As CAF-5 is employed to thicken low concentration excess sludge in Chaoyangzhou WWPT, the influent flow is 5m3/h, the sludge concentration is 4g/L, the dosage of flocculant FO4440SH is 1.0 kg/tDS and the dosage of surfactant 1227 is 0.2 kg/tDS, the solid...
O3-biological zeolite processes was used to treat micro-polluted raw water, The results show that zeolite modified by NaCl is efficiency on ammonia-nitrogen removal, at pH 6~9 and 150 min stirring time, the ammonia-nitrogen removal rate is 71.2%;During the culture of biofilm, ammonia-nitrogen removal rate of water treated by biological zeolite increased after decreasing. When the biofilm is mature,...
A novel type of TiO2/PP composite filler was produced by loading TiO2 on polypropylene (PP). Then the composite filler was used to pretreat micro-polluted lake water after natural biofilm culturing. The experiment results showed that, under the continuous operating conditions of inflow rate 120 L/h, filling ratio of filler 0.4, UV lamp power 72 W, pH of lake water 7.35, the average removal of CODMn,...
A simplified activated sludge model (SASM) was proposed, which based on the activated sludge model No.1 (ASM1). This model describes the carbon oxidation process, nitration process and denitration process. The amount of components and processes of the SASM is fewer than that of the ASM1, so the practicability of the SASM is enhanced. Using the SASM to simulate the DMBR by Biowin, the results showed...
Chlorobenzene(CB), one of the persistent organic pollutants (POPs), is a refractory semivolation organic compound and non-biodegradable. Treatment of CB contaminated wastewater by traditional method is essentially impossible. In the study, the sono-photocatalytic degradation of CB was examined in aqueous suspension using the TiO2 as photo catalyst. Some factors affecting the degradation rate of CB...
To solve the problems of the papermaking wastewater new discharge standards and reuse The microelectrolysis-fenton process has been applied to the advanced treatment of middle-stage wastewater with of poplar PRC-APMP Pulping. The effects of operational conditions such as Fe/C, pH, iron quantity, H2O2 dosage and reaction time, have been experimental studied, subsequently the best handles technological...
The composite photo catalyst of Fe3+-TiO2-zeolite is prepared in a bench scale, which is immobilized into a zeolite matrix by means of sol-gel technique. The oilfield wastewater in Huabei oilfield was chosen as the model pollutant to evaluate photo catalytic activity under the ultraviolet light and sunlight irradiation respectively, the possible mechanism of photo catalytic oxidation was deduced....
Titanium dioxide (TiO2) film was prepared on activated carbon fibre (ACF) by hydrolysis technique, using sulphate titanium as raw material. Based on the techniques of photo catalytic degradation using TiO2/ACF, and 254nm UV-ray as the light sources, aqueous phenol solution of 40mg/L was photo catalytic decomposed over TiO2 film. The result showed that TiO2/ACF exhibited a degradation efficiency of...
The supported catalyst was prepared with transitional metal Co as the active component and the granular active carbon as the carrier. The catalytic wet air oxidation of methyl orange simulated wastewater with chlorine dioxide as oxidant. The optimal conditions were as follows:pH was 2, the dosing quantity of chlorine dioxide was 24 mg/L and catalyst was 60·g/L-1, reaction time was 60 min, the maximum...
Removal of cyanides by the pulsed discharge plasma using a needle-plate reactor has been investigated. Effects of some factors were studied, including treatment modes, pH values, treatment time, and bubbling gases. The results of experiment indicate that the removal efficiency of cyanide increased greatly when air or nitrogen was injected into the reaction region during the discharge process, and...
In the present work, the photochemical oxidation of phenol and chlorophenol aqueous solutions in a batch recycle photochemical reactor using ultraviolet irradiation, hydrogen peroxide and TiO2 (as photocatalyst) was studied. The study showed that the combined treatment process was the most effective process under acidic conditions and showed a higher rate of degradation of phenol and chlorophenol...
The cyanide-containing wastewater mainly derives from chemical Engineering industry such as pesticide production, electroplating and metallurgy. It is very important to treat this kind of wastewater, because of the redundant toxic contaminants it contains.In this paper,using refractory and cyanide-containing pesticide wastewater as the subject investigated the effect of sodium hypochlorite to its...
To explore the feasibility of ORP as the control parameter of one-stage completely autotrophic nitrogen removal system, this test studied the synthetic low C/N waste water, analyzed the correlation between the variation rule of concentration of ORP and the transfer of nitrogen compounds in system under different concentrations of DO. Results indicated that the ORP curve emerged a turning point when...
The aim of this research is to apply experimental design methodology to the optimization of TiO2 film photocatalytic degradation of Dimethoate present in wastewater. UV/TiO2 photocatalysis for the oxidation of organic compounds pollutants in water is an environmental promising method. We used the progress of UV/H2O2, UV/TiO2/H2O2, UV/TiO2/Fenton and dark Fenton to degradation Dimethoate in the water,...
The aim of this study is to obtain a good description of nitrogen removal in a full scale oxidation ditch of 1300 m3 for later optimization. Different Data are collected and exploitation chart of this WWTP are used to analyze the working conditions. An intensive measuring campaign was investigated to describe the dynamic behavior. Different concentrations of nitrogen component are measured in the...
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...
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