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1. Selective removal and recovery of Fe(III) by garlic residue gel adsorption | |||
Xue Jiehao,Zhang Yangzhong,Meng Yeping,Zhou Hongyu,Huang Ying,Liu Junyou,Yin YanLi,Huang Kai | |||
Environmental Science and Techology 31 October 2018 | |||
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Abstract:Removal of iron in hydrometallurgical processes is a quite popular challenge, and the traditional methods such as precipitation may cause severe secondary pollution and resources waste. In present study, we attempted a cheap and effective technique to remove the iron ions by adsorption onto garlic residue gels. A simple chemical modification method to modify the peel by calcium hydroxide was proposed. Results showed that the optimal equilibrium pH is about 2.5 for 90 % adsorption without the hydrolysis of Fe(III). Adsorption equilibrium was attained within 60 min. The adsorption process can be described well by Langmuir model and pseudo-second-order kinetic equation, respectively. The maximum adsorption capacity for Fe(III) ions was found to be 1.4 mol/kg. The sulfenic acid, pectic acid, polyphenolic and alliin components contained in the garlic peel are inferred to be the main ligands responsible for the uptake of Fe(III) ions onto the gel. The simulated solutions referring to the hydrometallurgical process of nickel and copper were prepared to test the selective removal behavior of Fe(III), and the possibility of recovery and reuse of the adsorbed iron was also discussed. The present work may help to recycle and reuse the huge amount of iron resources in the real hydrometallurgical processes, and also bring a more ecofriendly, cleaner and shortened process for many traditional hydrometallurgical processes. | |||
TO cite this article:Xue Jiehao,Zhang Yangzhong,Meng Yeping, et al. Selective removal and recovery of Fe(III) by garlic residue gel adsorption[OL].[31 October 2018] http://en.paper.edu.cn/en_releasepaper/content/4746268 |
2. Microbial diversity and structure variations with filter depth during excess sludge reduction by vermifiltration | |||
Xing Meiyan,Yang Gege,Liu Jing,Ma Xiaojie | |||
Environmental Science and Techology 16 November 2015 | |||
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Abstract:The present study focuses on the effect of filter depth for the diversity and characteristics of microbial structure by conducting a novel four-stage vermifiltration (VF) system with earthworms. The results revealed that the microbial diversity along the filter depth was consistent with the sludge removal efficiency in the system, the distribution of earthworms and the change of organic materials by detecting SS, VSS and earthworms at each column. Specially, Polymerase chain reaction-denaturing gradient gel electrophoresis (PCR-DGGE) indicated that there were varies of microbial communities at different depths in VF, of which dominant species were Proteobacteria, especially the γ-proteobacteria. Earthworm activity and the distribution of organic matter led to the differences of the dominant populations at different depths in VF. Furthermore, the earthworm-microorganism interaction contributed to aerobic bacteria being preferentially selected in system. Overall, the results of the study described that the filter depth played an important role in sludge reduction, microbial diversity and structure. | |||
TO cite this article:Xing Meiyan,Yang Gege,Liu Jing, et al. Microbial diversity and structure variations with filter depth during excess sludge reduction by vermifiltration[OL].[16 November 2015] http://en.paper.edu.cn/en_releasepaper/content/4661488 |
3. Analysis of the development of global carbon offsets | |||
Pan Lingxiao,Xu Jiren,Yang Yuanxuan | |||
Environmental Science and Techology 01 August 2010 | |||
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Abstract:A carbon offset is a financial instrument aimed at a reduction in greenhouse gas emissions.Carbon offsetting has gained some appeal and momentum mainly among consumers in western countries who have become aware and concerned about the potentially negative environmental effects of energy-intensive lifestyles and economies. In this papper, we will analysis the development situation of carbon offset. | |||
TO cite this article:Pan Lingxiao,Xu Jiren,Yang Yuanxuan. Analysis of the development of global carbon offsets[OL].[ 1 August 2010] http://en.paper.edu.cn/en_releasepaper/content/4380468 |
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