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Luo S.,Zhejiang Provincial Key Laboratory of Solid Waste Treatment and Recycling | Luo S.,Hunan University | Luo S.,Hunan Provincial Architectural Design Institute | Yang C.,Zhejiang Provincial Key Laboratory of Solid Waste Treatment and Recycling | And 5 more authors.
Huanjing Kexue Xuebao/Acta Scientiae Circumstantiae | Year: 2015

Two different types of resins, D707 and D708, were selected for the treatment of wastewater with high-concentration ammonia from vanadium smelting. Static adsorption experiments showed that the adsorption removal rates increased with the increasing dosage of the resins. In acidic condition, the adsorption removal rate increased with the increase of the pH value. The adsorption reached equilibrium at a mixing time of 90 min. At pH value of 7, adsorption capacities of D707 and D708 achieved 196.1 and 217.4 mg·g-1, respectively. Data of the adsorption by the resins showed the adsorption was endothermic. At 298 K, the activation energy for the adsorption of NH4+ by D707 and D708 were 54.67 and 34.46 kJ·mol-1, respectively. Liquid film diffusion was the rate-control process for the adsorption. Experimental data correlated well with the Langmuir adsorption isotherm. When 2 mol·L-1 H2SO4 was used for desorption of D707 and D708 resins, desorption removal rates for both resins exceeded 98%. The adsorption rate remained unchanged after three repeated adsorption cycles. ©, 2015, Science Press. All right reserved. Source


Xu R.,Harbin Institute of Technology | Xu R.,Jinan Municipal Engineering Design & Research Institute Group Co. | Xu Y.,Harbin Institute of Technology | Xu Y.,Urban Engineer | And 5 more authors.
Journal of Harbin Institute of Technology (New Series) | Year: 2015

The overall purpose of this research is to examine the impact of untreated sedimentation tank sludge water (USTSW) recycle on water quality during treatment of low turbidity water in coagulation-sedimentation processes. 950 mL of raw water and different concentrations of 50 mL USTSW are injected into six 1000 mL beakers without coagulant. The results indicate that USTSW characterized as accumulated suspended solids and organic matter has active ingredients, which possess the equivalent function of coagulant. The optimal blended water turbidity is in the range of 10-20 NTU, within which USTSW recycle achieves the highest save coagulant rate. The mechanism of strengthening coagulation effect when USTSW recycle mainly depends on the chemical effect and physical effect. What is more, through scanning electron microscopy (SEM), it is found that the floc structures with USTSW recycle are more compact than those without USTSW recycle. Besides, the water quality parameters of color, NH3-N, CODMn, UV254, total aluminum, total manganese when USTSW recycle is better than the raw water without recycle, indicating that USTSW recycle can improve water quality with strengthening coagulation effect. ©, 2015, Harbin Institute of Technology. All right reserved. Source


Feng Y.,Harbin Institute of Technology | Feng Y.,University of Jinan | Wang X.,China Urban Construction Design & Research Institute Co. | Qi J.,Harbin Institute of Technology | And 3 more authors.
Desalination and Water Treatment | Year: 2015

The degradation of ibuprofen was investigated in aqueous solution by three-dimensional particle electrode (TDE) technology. When the initial concentration was between 10 and 40 mg/L, almost 80% of the ibuprofen was degraded at 6 h. However, only about 16.64% of ibuprofen was mineralized even at 6 h according to total organic carbon measurements. A combined process of TDE and biological aerated filter (BAF) was therefore developed to enhance the treatment of ibuprofen contaminated municipal sewage. The effluent quality of coupled process was substantially improved by TDE due to the degradation of ibuprofen and related intermediates. The experimental results showed that TDE-BAF is effective for removing ibuprofen from municipal sewage. © 2015 Balaban Desalination Publications. All rights reserved. Source

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