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The catalytic behavior of five different carbon materials (mesoporous graphite-like carbon Sibunit, catalytic filamentous carbon (CFC), nano-diamonds (ND) and onion-like carbon (OLC)) in the catalytic wet peroxide oxidation of model organic compounds with different sorption capacities and stability towards oxidation (phenol, ethanol and formic acid) has been examined, in the absence and in the presence...
Preparation of efficient adsorbents with sewage sludge and its application in chromium-containing wastewater treatment was discussed. The chemical physics activation method was used to dispose secondary sedimentation tank sludge and the final residual sludge to produce activated carbon, respectively. The effect of concentrations of oxidizer, activated temperature, solid-liquid ratio and activation...
Heavy metals contamination and other physico-chemical changes in underground and surface water by acid mine drainage (AMD) were determined on the impact on creeks or streams. High levels of these metals have been reported in mining areas over the years; however, investigations indicates that less monitoring has been done on water discharged as effluent for effective maintenance mechanisms to be effected...
Degradation of phenol by an electrochemical heterogeneous catalytic process was applied in packed bed electrolytic reactor with graphite electrode. The catalyst was characterized by SEM and the effects of pH, the applied potential and Na2SO4 on the efficiency of the electrochemical oxidation phenol process were also studied. It was found that the optimal condition was an applied potential of 25V,...
In this paper, nanosized TiO2 modified ultra-filtration membrane catalyzed ozonation is studied. Firstly, the mechanism of TiO2-catalyzed ozonation process is confirmed and it was also observed that catalytic ozonation were significantly influenced by tert-butyl alcohol, which testified that nanosized TiO2 catalyzed ozonation of organics follows a radical-type mechanism. In comparison of ozonation...
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...
Supercritical water oxidation was used for the treatment of oily wastewater generated as a consequence of steel production. Following a reaction at 430°C, a pressure of 40 MPa for 150 seconds, wastewater oil content was reduced to 2 mg/L, equivalent to a 97.7% reduction rate, allowing for the reuse of the wastewater. In addition, the reaction kinetics was determined to be first order with the integral...
H2O2-based advanced oxidation processes (AOPs) and SO4·--based AOPs were proved novel and promising techniques in treatment of wasterwater. Microwave (MW)-assisted hydrogen peroxide (H2O2), peroxymonosulfate (PMS) and persulfate (PS) were used to dispose of COD in landfill leachate. Oxidant dosage and chloride concentration were investigated as the major operating conditions. The initial COD is 4062...
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...
Wastewater treatment practices have been significantly improved since the introduction of novel microbial treatment technologies. The Sequencing Batch Reactor (SBR) system for ammonia removal over nitrite (SHARON) process by intermittent aeration as well as the key parameters of SHARON, were studied in this paper, which includes pH, temperature, dissolved oxygen (DO) and sludge age, to obtain the...
Partial nitrification to nitrite is technically feasible and economically favourable, especially when wastewaters contain high ammonium concentrations. Partial nitrification can be obtained in situations of free ammonia inhibition the nitrite oxidizer but not the ammonia oxidizer. The effects of free ammonia on partial nitrification for treating old landfill leachate were investigated with different...
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...
Due to its high-temperature nature, high-temperature dyeing wastewater is a major challenge for treatment. In this paper, using the high thermal energy of high-temperature printing and dyeing wastewater to activate persulfate (PS) for dye treatment was investigated. Acid orange 7 (AO7) was chosen as a model compound. The result shows that increasing the temperature or PS concentration is beneficial...
An expanded granular sludge bed packed with porous sponge was started to treat wastewater contaminated by sulfide, nitrate, nitrite and organic carbon compounds. In inflow wastewater, potassium nitrate and sodium nitrite acted as electron acceptors, sodium sulfide acted as electron donor and glucose acted as organic carbon source. In the anoxic reactor, autotrophic denitrification happened together...
Seawater substitution is one of the effective routes to alleviate the shortage of water resources, and its high saline matter can be used in printing and dyeing industry. However, the treatment of the formed dyeing wastewater is difficult for the high salt. This paper using ultraviolet (UV) light to activate persulfate (PS), hydrogen peroxide (H2O2), Oxone (PMS) to degrade azo dye Acid orange 7 (AO7)...
A kind of technology and process of treating printing and dyeing wastewater with high efficiency and low energy consumption was presented. Based on the analysis of the current methods, this article summed up the more practical way, combining theory with practice, to provide some references for the similar projects.
The performance and enhancement of pollutants removal in raw municipal sewage by a new pretreatment process were investigated in this study. The experiments were carried out with a GS sedimentation tank in full scale plant. The results revealed that average removal efficiency of TP, TSS, and TN achieved 49%, 67.3% and 20% respectively during stable running period. TSS removal rate could achieve about...
The excess sludge of wastewater biological treatment, as refractory compounds, only 25-40% of which could be biodegraded. While much research work has be done about the application of sludge, there were concerns about the application of biosolids due to risks associated with disease, odor, nutrients and the presence of toxic metals. Recently, many studies have focused on sludge reduction technology...
A self-designed MBR was added the photo catalyst TiO2 which was immobilized on polyurethane foam (PF) cubes to make a pMBR. The PF cubes can suspend and circulate in the MBR. The photo degradation of dyeing wastewater was optimized by evaluating the effects of different factors, such as, COD, BOD5 concentration, carrier dosage and its microorganisms. The result showed that the photo catalytic oxidation...
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...
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