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.

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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. Fate and Removal of Various Antibiotic Resistance Genes in Typical Pharmaceutical Wastewater Treatment Systems
	Zhai Wenchao,Mao Daqing,Luo Yi
	Environmental Science and Techology 25 December 2015
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	Abstract:The high levels of antibiotic residues in pharmaceutical wastewater treatment plants (PWWTPs) make these plants the hotspots for the proliferation of antibiotic resistance genes (ARGs). This study investigated the fate and removal of 11 subtypes ARGs for sulfonamide, tetracycline, β-lactam and macrolide resistance in each stage of two full-scale PWWTPs in northern China. The levels of typical ARG subtypes in the final effluents ranged from (2.56±0.13)×10^1 to (2.36±0.11)×10^7copies/ml. The absolute abundance of ARGs in effluents accounted for only 0.03%-78.1% of influents of the two PWWTPs, while the majority of the ARGs were transported to the dewatered sludge with concentrations from (2.65±0.43)×10^5 to (4.27±0.03)×10^10copies/g dry weight (dw). The total loads of ARGs discharged through dewatered sludge plus effluent was 1.01-14.09 folds higher than that in the raw influents, suggesting the proliferation of ARGs occurred in the wastewater treatment. The proliferation of ARGs mainly occurs in biological treatment process, such as aeration tank, anoxic tank, sequencing batch reactor (SBR) and bio-contact oxidation, facilitates the proliferation of various ARGs, implying significant replication of certain subtypes of ARGs may be attributable to microbial growth. Chemical oxidation seems promising to remove ARGs, with removal efficiency ranged from 29.3% to 85.7%, while the partial correlation analysis showed significant correlations between antibiotic concentration and ARG removal. Thus the high antibiotic residues within the PWWTPs may have an influence on the proliferation, fate and removal of the associated ARG subtypes.
	TO cite this article:Zhai Wenchao,Mao Daqing,Luo Yi. Fate and Removal of Various Antibiotic Resistance Genes in Typical Pharmaceutical Wastewater Treatment Systems[OL].[25 December 2015] http://en.paper.edu.cn/en_releasepaper/content/4673578

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	3. Microbial enzym and biomass responses:deciphering vermifiltration treating excess sludge fed continuosly using Eisenia fetida despite seasonal variations
	XING Meiyan,Sun Wen,XU Zhe
	Environmental Science and Techology 26 August 2014
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	Abstract:This paper reports on a seasonal pattern comparison of microbial enzymatic activities and biomass responses based on a conventional biofilter (BF, without earthworm) and a vermi?lter (VF, with earthworm, Eisenia fetida) for sewage sludge treatment fed continuously. The VSS reduction, viable cell number and enzyme activities were assayed to probe what made the VF operated stably. The results indicated that the earthworms' activities can further the volatile suspended solids (VSS) reduction with a 27.17% more than BF. Though the VF has a lower level in the viable cell number, the earthworms strongly improved the enzyme activities, such as INT- dehydrogenase, protease, β-glucosidase and amylase, which can explain the excellent performance of VSS reduction, compared with the BF. The correlation analysis documented that the VSS reduction was positively correlated with microbial enzyme activities. More importantly, the earthworm enabled the VF to avoid the detrimental influence of temperature, which guaranteed a stable performance during seasonal variations.
	TO cite this article:XING Meiyan,Sun Wen,XU Zhe. Microbial enzym and biomass responses:deciphering vermifiltration treating excess sludge fed continuosly using Eisenia fetida despite seasonal variations[OL].[26 August 2014] http://en.paper.edu.cn/en_releasepaper/content/4607574


	4. Aerobic biodegradation of trichloroethylene by a bacterial community that uses hydrogen peroxide as the sole oxygen source
	ZHANG Shiyang,WANG Xiaoli,ZHU Ruili,Li Hui,WANG Ping,YANG Jie,LIN Kuangfei,GU Jidong,LIU Yongdi
	Environmental Science and Techology 04 June 2014
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	Abstract:In this study, a bacterial community was enriched to aerobically degrade trichloroethylene (TCE) by using hydrogen peroxide (H2O2) as the sole oxygen source. The enriched bacterial community could degrade 120 mg/L TCE within 12 d in the presence of 8 mM H2O2, which was found to be the optimum concentration, and the efficiency of TCE degradation reached up to 80.6%. The bacterial community adapted to 2-8 mM H2O2 by increasing the activities of key enzymes, including catalase, superoxide dismutase, and peroxidase. 16S rRNA gene cloning and sequencing showed that the dominant species in the community belonged to Bordetella, Stenotrophomonas, Sinorhizobium, Variovorax, and Sphingobium. Polymerase chain reaction analysis revealed that phenol hydroxylase (Lph) gene was involved in TCE degradation in the presence of H2O2. Phenol induced the bacterial Lph gene, which catalyzed epoxidation of TCE. Our study findings might contribute to the in situ bioremediation of TCE-contaminated groundwater.
	TO cite this article:ZHANG Shiyang,WANG Xiaoli,ZHU Ruili, et al. Aerobic biodegradation of trichloroethylene by a bacterial community that uses hydrogen peroxide as the sole oxygen source[OL].[ 4 June 2014] http://en.paper.edu.cn/en_releasepaper/content/4599609


	5. Optimization of Operating Conditions for MBR Treating Mustard Tuber Wastewater by RSM
	CHAI Hongxiang,Wei Yinghua,DU Jun,FANG Junhua
	Environmental Science and Techology 24 January 2013
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	Abstract:In this paper the effects of operating conditions of the membrane bioreactor (MBR) treating mustard tuber wastewater with 7% of salinity (calculated as NaCl) on membrane fouling rate was investigated , and the operating conditions of the reactor was optimized. With the increasing rate of filtration resistance with the cumulative permeate volume（Kv）used to characterize the membrane fouling rate, the study designed three sets of single- factor experiments to investigate the effects of suction suspended time (t), aeration intensity (UGr) and transmembrane pressure (ΔP) on Kv. The result showed that with increasing of t, UGr and ΔP, KV decreased at first and then increased, and t, UGr and ΔP had optimal values. With response surface methodology(RSM)，the MBR operating conditions were optimized，and the optimal conditions was as follows: t = 2min, UGr = 12m3m-2h-1 and ΔP = 5KPa. Through analysis of the response surface plots, interactions between the operating conditions were analyzed, and a conclusion was drawn that interaction between t and UGr was strong, and so was interaction between UGr and ΔP, but the interaction between t and ΔP was not significant.
	TO cite this article:CHAI Hongxiang,Wei Yinghua,DU Jun, et al. Optimization of Operating Conditions for MBR Treating Mustard Tuber Wastewater by RSM[OL].[24 January 2013] http://en.paper.edu.cn/en_releasepaper/content/4515610


	6. The influence of nonstoichiometry on LaMnO3 perovskite for catalytic NO oxidation
	CHEN Jiahao,SHEN Meiqing,WANG Xinquan,WANG Jun
	Environmental Science and Techology 11 December 2012
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	Abstract:A series of structural modified LaxMnO3 (x = 0.9, 0.95, 1, 1.05, 1.11) perovskites used for NO oxidation was synthesized by a sol-gel method and characterized by XRD, BET, XPS, EPR and H2-TPR. La0.9MnO3 sample exhibits superior activity, and a 50% NO conversion at 250 C is obtained. XPS and EPR results reveal a higher Mn4+/Mn3+ ratio in Mn-rich samples, which induce more active oxygen bonding to Mn4+ due to the need for balancing the chemical states and stabilizing the structure. Easily regenerated oxygen associated with Mn4+ catalyzes the low-temperature NO oxidation. The constant activation energy (44.8 kJ/mol) obtained in the kinetics tests indicates the same mechanism of NO oxidation operated on all the samples.
	TO cite this article:CHEN Jiahao,SHEN Meiqing,WANG Xinquan, et al. The influence of nonstoichiometry on LaMnO3 perovskite for catalytic NO oxidation[OL].[11 December 2012] http://en.paper.edu.cn/en_releasepaper/content/4500817


	7. Comprehensive application and potential prediction for bathing water recycling in buildings
	Liu Meng,Li Yongqiang,Yang Xincheng
	Environmental Science and Techology 15 October 2012
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	Abstract:Due to global climate change and resource shortage, energy efficiency and resource recycling received extensive attention. China has pushed forward the development of green building as national development strategy. Bathing water consumes both water and energy a lot. Varieties of studies have been carried out on the recycling of waste bathing water leading to numbers of technologies and theoretical researches. But current studies are restricted to the transformation of independent bath units, lacking of recycling on overall structure of the buildings and the analysis on inherent potential. This paper takes both energy and water reuse into consideration, providing a comprehensive application by the settlement using the waste water from bath for greening irrigation and warming-up the inlet bathing water. Predictions are made on energy saving efficiency in different seasons (26.1%, 29.2%, 28.6%) and irrigation ability per capita (97m2) of the comprehensive application.
	TO cite this article:Liu Meng,Li Yongqiang,Yang Xincheng. Comprehensive application and potential prediction for bathing water recycling in buildings[OL].[15 October 2012] http://en.paper.edu.cn/en_releasepaper/content/4488331


	8. A Study on the Removal of Carbamazepine and Nitrobenzene in an Enhanced Membrane Bioreactor Process by Adding Powder Activated Carbon
	FAN Huiju,FENG Li,FENG Lijuan,ZHANG Liqiu
	Environmental Science and Techology 31 October 2011
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	Abstract:This paper investigated the removal of carbamazepine and nitrobenzene in an enhanced membrane bioreactor by adding powder activated carbon (PAC). The experimental results of two and half months' continuous operation showed that nitrobenzene can be removed completely no matter whether PAC was added or not. And the contributions of natural volatilization, aeration and activated sludge for the removal of nitrobenzene are 15.2%, 22.2%, and 62.6%, respectively. In comparison to nitrobenzene, carbamazepine's removal was of no avail after one month's operation without adding PAC, however, the removal efficiency of carbamazepine in the enhanced membrane bioreactor with PAC maintained at a stable level of 30%~40% after one month's operation. After PAC dosing, the amounts removed by adsorption and missing (probably biodegradation) both increased greatly, and the overall removal efficiency of carbamazepine raised 24.44 percents. These results indicate the possibility that PAC cannot only adsorb carbamazepine but also promote the biodegradation of carbamazepine. Furthermore, the sludge-water partition coefficient (Kp) and total adsorbed amounts of carbamazepine before and after PAC dosing are ascertained and compared.
	TO cite this article:FAN Huiju,FENG Li,FENG Lijuan, et al. A Study on the Removal of Carbamazepine and Nitrobenzene in an Enhanced Membrane Bioreactor Process by Adding Powder Activated Carbon[OL].[31 October 2011] http://en.paper.edu.cn/en_releasepaper/content/4447919


	9. Effects of PCE pollution on soil enzyme activities
	Tao Honglin,Shan Aiqin
	Environmental Science and Techology 09 April 2011
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	Abstract:Simulated experiments were conducted to study the eco-toxicology effects of PCE pollutant on three main soil enzyme activities: protease, urease and catalase. The results showed that, increasing the initial PCE concentration resulted in higher inhibition effect on both protease and urease activities. The process was inhibited firstly and then recovered. PCE had a significant inhibition effect on soil protease and urease activites when its concentration ≥0.15, and ≥3.0mg/kg, respectively. The inhibition effect on soil protease and urease activites was indistinctive when PCE concentration <0.05, and <0.3mg/kg, respectively. On the first day, the inhibitory rates for protease activity were 28.31%~63.64%, and reached the maximum levels. The inhibition term of PCE on protease was about 9~15 days. It had a high significant inhibition effect (49.7%~71.09%) to urease activity on the first day when PCE concentration was above 0.15mg/kg. The inhibition term of PCE on urease was about 5~9 days. PCE had no obvious inhibition effect but a slight activation effect to catalase activity when its concentration was 0.05~30.0mg/kg. Within the experimental concentration range, microbes in contaminated soil had great resistance to peroxidation. Soil protease and urease were the most sensitive to PCE. The different effects of PCE on different enzymes would affect the properties and functions of the PCE contaminated soil.
	TO cite this article:Tao Honglin,Shan Aiqin. Effects of PCE pollution on soil enzyme activities[OL].[ 9 April 2011] http://en.paper.edu.cn/en_releasepaper/content/4421189


	10. Proteomics of a toxic dinoflagellate Alexandrium catenella DH01: Detection and identification of cell surface proteins by fluorescent labeling
	LI Cheng,WANG Dazhi,XIE Zhangxian,DONG Hongpo,HONG Huasheng
	Environmental Science and Techology 27 March 2011
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	Abstract:Alexandrium catenella DH01 is a toxic dinoflagellate species which is not only able to produce paralytic shellfish toxins(PSTs) but also cause harmful algal blooms (HABs) in the coast of China. In this study, we present a new protocol for specific labeling and detection of cell surface proteins (CSPs) of A. catenella DH01 cells using CyDye DIGE Fluor minimal dyes, and have identified CSPs using a combining approach of two dimensional gel electrophoresis (2-DE) and MALDI-TOF-TOF mass spectrometry. The results showed that the fluorescent cyanine dye Cy3 could specific combine with CSPs of A. catenella DH01 cells with minimal labeling of intracellular proteins. Trizol method was the best to extract CSPs with respect to protein spot number and resolution among the three protein extraction methods. A total of 41 CSPs were separated and identified from A. catenella DH01 in 2-D gel, among of them, 14 proteins gave the positive identification of protein orthologues in the protein database by MALDI TOF-TOF MS analysis. This work represents the first attempt to investigate CSPs of A. catenella using CyDye DIGE fluors dyeing method, which provides a potential important tool for future comprehensive characterization of CSPs and elucidation of physiological functions of CSPs in dinoflagellatess.
	TO cite this article:LI Cheng,WANG Dazhi,XIE Zhangxian, et al. Proteomics of a toxic dinoflagellate Alexandrium catenella DH01: Detection and identification of cell surface proteins by fluorescent labeling[OL].[27 March 2011] http://en.paper.edu.cn/en_releasepaper/content/4418677

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