| 1 | Cr(Ⅲ) removal from simulated solution using hydrous magnesium oxide coated fly ash: Optimization by response surface methodology (RSM)显示文摘Hydrous magnesium oxide coated fly ash(MFA) has environmental remediation potential by providing a substrate for the adsorption of aqueous Cr(Ⅲ). Aqueous Cr(Ⅲ) adsorption onto MFA was examined as a function of MFA dosage, p H and initial Cr(Ⅲ) concentration with the Box–Behnken approach used for experimental design and optimization using response surface methodology(RSM). p H and dosage(dosage and concentration) have significant interactive effects on Cr(Ⅲ) adsorption efficiency. Analysis of variance shows that the response surface quadratic model is highly significant and can effectively predict the experimental outcomes. Cr(Ⅲ) removal efficiency of 98% was obtained using optimized conditions of MFA dosage, p H and initial Cr(Ⅲ) concentration of 1.57 g·L^(-1), 4.11 and 126 mg·L^(-1), respectively. Cr(Ⅲ) adsorption onto MFA is mainly attributed to the interaction between Cr(Ⅲ) and the functional group \\OH of the hydrous magnesium oxide, in all probability caused by chemisorptions. The results of this study can conduce to reveal the interactions between Cr(Ⅲ) pollutant and MFA characteristics, posing important implications for the cost-effective alternative adsorption technology in the treatment of heavy metal containing wastewater. | Min Xia Chunsong Ye Kewu Pi Defu Liu Andrea R. Gerson | 2018 | Chinese Journal of Chemical Engineering2018，26，5： | 1 |
| 2 | Biodegradability enhancement of municipal landfill leachate显示文摘The method of enhancing the biodegradability of landfill leachate via air stripping followed by coagulation/ultrafiltration (UF) processes is introduced. In this study, the air stripping process obtained a removal efficiency of 88.6% for ammonia nitrogen (NH3-N), at an air-to-liquid ratio (A/L) of 3 300 (pH = 11) and after 18 h of stripping. The single coagulation process increased the BOD (biological oxygen demand)/COD (chemical oxygen demand) ratio by 0.089 with a FeCl3 dosage of 570 mg/L, at pH 7.0, and the single UF process increased the BOD/COD ratio from 0.049 to 0.311. However, the combination of coagulation and UF increased the BOD/COD ratio from 0.049 to 0.423, and the final BOD, COD, NH3-N, and colour of the leachate were 1 023 mg/L, 2 845 mg/L, 145 mg/L, and 2 056, respectively, when a 3 kDa molecular weight cut-off (MWCO) membrane was used at an operating pressure of 0.7 MPa. In the ultrafiltration process, the average solution flux (JV), concentration multiple (MC), and retention rate (R) for the COD were 107.3 L/(m2·h), 6.3, and 84.2%, respectively. | Pi Kewu Gong Wenqi | 2008 | Water Science and Engineering2008，1，4： | 1 |
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