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101.
Batch experiments were conducted to investigate the phosphorus(P) adsorption and desorption on five drinking water treatment residuals(WTRs) collected from different regions in China. The physical and chemical characteristics of the five WTRs were determined. Combined with rotated principal component analysis, multiple regression analysis was used to analyze the relationship between the inherent properties of the WTRs and their P adsorption capacities. The results showed that the maximum P adsorption capacities of the five WTRs calculated using the Langmuir isotherm ranged from 4.17 to8.20 mg/g at a p H of 7 and further increased with a decrease in p H. The statistical analysis revealed that a factor related to Al and 200 mmol/L oxalate-extractable Al(Alox) accounted for 36.5% of the variations in the P adsorption. A similar portion(28.5%) was attributed to an integrated factor related to the p H, Fe, 200 mmol/L oxalate-extractable Fe(Feox), surface area and organic matter(OM) of the WTRs. However, factors related to other properties(Ca,P and 5 mmol/L oxalate-extractable Fe and Al) were rejected. In addition, the quantity of P desorption was limited and had a significant negative correlation with the(Feox+ Alox) of the WTRs(p 〈 0.05). Overall, WTRs with high contents of Alox, Feoxand OM as well as large surface areas were proposed to be the best choice for P adsorption in practical applications. 相似文献
102.
Ning Wang Jiangtao Feng Wei Yan Luohong Zhang Yonghong Liu Ruihua Mu 《Frontiers of Environmental Science & Engineering》2022,16(8):105
103.
This paper compares the capability of a first-order and a spherical diffusion model to describe and predict long-term sorption and desorption processes of chlortoluron in two soils. Chlortoluron sorption was investigated at different time scales utilizing one rate experiment (120 days) and two sorption/desorption experiments. Experimental periods for sorption and desorption were set to 1 day (five desorption steps) and 30 days (three desorption steps), respectively. Upon fitting, the two models satisfactorily described the whole set of data. The spherical diffusion model performed better than the first-order model. We then tested the predictive capability of the models by predicting 30-day sorption/desorption data using kinetic parameters fitted on 1-day sorption/desorption data only. While the spherical diffusion model was able to predict the 30-day data set, the first-order model failed completely. Fitting both models to subsets of the data corresponding to different experimental time scales revealed that the rate parameter as well as the Freundlich coefficient of the first-order model are strongly time-dependent--a property that is not shared by parameters of the spherical diffusion model. The apparent stability of the spherical diffusion model with regard to time dependency of its parameters indicates that sorptive uptake may be diffusion-controlled. This also explains the models greater predictive power across different time scales compared to the first-order model. Finally, we investigate the suitability of solute class specific log-linear relationships between the first-order rate parameter and the Freundlich coefficient presented by earlier researchers in the light of the time dependency observed for the parameters of the first-order model. 相似文献
104.
采用谐振式紊动模拟装置使污染泥沙受到扰动,解吸重金属污染物进行模拟试验研究。在此基础上,由极坐标下的重金属迁移转化数学模型方程,针对具体的试验条件进行数值求解。计算和试验结果吻合良好。说明数学模型是正确合理的。计算中采用由静态试验得出的泥沙吸附-解吸特性参数,这对于评价静态试验成果,利用静态试验成果于天然河流水体具有一定的参考价值。 相似文献
105.
选择上海地区广泛分布的水稻土,通过静态吸附平衡试验,比较土壤去除非晶质氧化铁和去除游离氧化铁后对Pb2+的吸附-解吸行为,采用数学模型拟合,探讨3种土壤的最佳拟合方程、最大吸附的理论值和亲和能力,进而研究非晶质氧化铁和游离氧化铁对Pb2+吸附-解吸的影响。结果表明,去除氧化铁后吸附能力和亲和能力均减弱,原土的最大吸附量为29.21 g/kg,非晶质氧化铁的贡献值为3.52 g/kg,游离氧化铁的贡献值为8.32 g/kg。 相似文献
106.