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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...
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...
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...
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...
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,...
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...
Fenton oxidation-activated carbon adsorption combination process was used for the treatment of ammunition disposal wastewater in an ammunition experimental station in Lanzhou Corps District. The pilot plant tests indicated that the decomposition efficiency of ammunition disposal wastewater was affected markedly by the impact factors of Fenton oxidation. The optimal parameters of Fenton oxidation reaction,...
An effective and economic process for removing arsenic in waste water which is acuminating in the process of etching, cutting and washing in semiconductor industry has been developed in this paper. The proposed technique of arsenic removal is in three steps: first pretreatment step is to oxidize arsenite to arsenate by potassium permanganate, second key step is precipitation based on arsenic compound...
A new kind of activated carbon fiber (ACF) based on kapok was prepared by activation with diammonium hydrogen phosphate [(NH4)2HPO4] at 923 K for 70 min. Two preoxidation methods and one without preoxidation were adopted to produce AK-2, AK-3 and AK-1 respectively. The characteristics of the ACFs were determined with N2 adsorption-desorption isotherms and Boehm titration. And the process of activation...
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