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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...
Phosphorus is often a limiting factor for the eutrophication of surface waters. An efficient removal of this constituent from the effluent of municipal wastewater treatment plants has been of growing interest. Alum salts (AlCl3, Al2(SO4)3) and iron salts (FeCl3, FeSO4) are the commonly used chemical coagulants for the removal of phosphorus. The aim of the present work was to evaluate the coagulation...
The removal of phosphate by KMnO4-Fe(II) process was investigated under different experimental conditions. The results showed that mix speeds and settling time had no significant effect on phosphate removal. The removal of phosphate was gradually increased with the increase of Fe dosages and decreased with the increase of pH. When the pH increased from 4 to 9, the removal of phosphate decreased from...
PBS (flyash-based coagulant) made by fly ash in coal-fired thermal power plants and blast furnace iron sludge extracted with a dilute H2SO4 was used as coagulant in the treatment of tanning wastewater. The influence of pH value, coagulant dosage and temperature on coagulation effect was investigated. The results showed that this coagulant had satisfactory results to treat tanning wastewater under...
Aim of this study was to investigate the effects of initial pH and current density on phosphate removal from source separated urine by electrocoagulation using iron electrodes. Results show that while the initial pH was at 6 and the current density was 50 mA/cm2, nearly 100% of phosphate could be removed from urine after being electrolyzed for 15 minutes under the operation conditions as the gap between...
Deep color and high concentration of organic compounds are the important characteristics of Chemithermomechanical pulp (CTMP) effluent. The objectives of this study are to investigate the feasibility of removing the color of eucalyptus CTMP chemical pretreatment effluent with zero-valent iron (Fe (0)) and to examine the effect of Fe (0) treatment on biodegradability enhancement of the effluent. The...
Electrocoagulation was used for treating micro-polluted raw water. Laboratory scale experiments were conducted with two electrode materials namely, aluminum and iron, Aluminum was selected in these experiments. The optimum working pH was found to be in the neutral condition, allowing raw water to be treated directly without pH adjustment. The given current density and operating time were 50 A/m2 and...
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