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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. Removal of uranium from aqueous solution by graphene oxide | |||
YU Jing,WANG Jianlong | |||
Environmental Science and Techology 29 April 2017 | |||
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Abstract:In this paper, the adsorption of uranium by graphene oxide was investigated. The effect of pH, contact time, concentration of uranium and temperature on the adsorption capacity of uranium was determined. The graphene oxide (GO) was characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM), powder X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS) and infrared spectra (FTIR). FTIR spectra indicated that carboxyl and alkoxy groups existed on the surface of GO, which involved in uranium adsorption. The adsorption kinetics of U(VI) followed pseudo first-order kinetic model. The adsorption isotherm conformed to Tempkin model. The adsorption process is spontaneous and exothermic. | |||
TO cite this article:YU Jing,WANG Jianlong. Removal of uranium from aqueous solution by graphene oxide[OL].[29 April 2017] http://en.paper.edu.cn/en_releasepaper/content/4730928 |
3. Efficiency assessment and optimization of the sulfite/UV process for reductive dehalogenation | |||
TENG Long,XIE Bihuang,LI Xuchun | |||
Environmental Science and Techology 09 September 2016 | |||
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Abstract:The sulfite/UV process is an promising alternative to remediation of a wide variety of recalcitrant contaminants such as halogenated organic compounds by producing powerfully reducing species, hydrated electron (eaqˉ). This study was intended to assess the efficiency of the process and to optimize the system. Selecting monochloroacetic acid (MCAA) as the simple model compound, energy efficiency of the reductive dehalogenation by the process was assessed based on the degradation kinetics of MCAA. The energy efficiency was analyzed by taking into account both of the electric energy input and chemicals consumption. The energy efficiency generally increased with increasing UV dose while showing a parabolic profile with respect to S(IV) dosage. Thus, the process could be optimized by controlling UV dose and S(IV) dosage in tandem, and several optimization approaches were also proposed and discussed. The process still shows effects in reducing MCAA in the realistic surface water, and the efficiency EE/O for reductive dehalogenation was estimated to be about18.6 kWh m-3 order-1 by the sulfite/UV process, suggesting that the process was efficient and promising in destroying many recalcitrant contaminants. | |||
TO cite this article:TENG Long,XIE Bihuang,LI Xuchun. Efficiency assessment and optimization of the sulfite/UV process for reductive dehalogenation[OL].[ 9 September 2016] http://en.paper.edu.cn/en_releasepaper/content/4704345 |
4. The Effect of Degree of Sulfonation of Sulfonated Poly(arylene ether sulfone) Membranes on the Microbial Fuel Cell Performance | |||
Bi Huiping,Ran Dongqin,Hu Zhaoxia,Chen Shouwen | |||
Environmental Science and Techology 03 June 2016 | |||
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Abstract:A series of sulfonated poly(arylene ether sulfone) (SPAES) membranes with different of degree of sulfonation (DS) are prepared for microbial fuel cell (MFC) applications. The performance of the MFCs equipped with SPAES membranes is investigated in details. During the start-up stage, the need time of reaching stable state and maximum anodic potential for the MFCs decreases with the increase of DS of the SPAES membranes. However, the power density of MFCs with SPAES(5-5), SPAES(4-6), SPAES(3-7) is very close after 14 days, which should be resulted from the combining effects of the exchange of H+ to Na+ in the SPAES membrane and the fouling of the membranes. The DS affects the anti-fouling activity of SPAES membranes, and higher DS leads to lower anti-fouling activity. The MFC equipped with SPAES(3-7) membrane (DS=30%, IEC=1.31 mmol g-1) is considered the better choice for the long-term operation. | |||
TO cite this article:Bi Huiping,Ran Dongqin,Hu Zhaoxia, et al. The Effect of Degree of Sulfonation of Sulfonated Poly(arylene ether sulfone) Membranes on the Microbial Fuel Cell Performance[OL].[ 3 June 2016] http://en.paper.edu.cn/en_releasepaper/content/4695751 |
5. Metagenomic analysis and comparison of microbial community structure of aerobic activated sludge and anaerobic digestion sludge | |||
GUO Jianhua,PENG Yongzhen | |||
Environmental Science and Techology 21 May 2016 | |||
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Abstract:Aerobic activated sludge and anaerobic digestion sludge contain highly complex microbial communities, which play a crucial role in both wastewater treatment and sludge management. Although the responsible microbes have been intensively studied, in communities of high complexity, conventional approaches based on 16S rRNA cannot completely reveal the whole microbial community structure. The metagenomic sequencing was applied to characterize and compare microbial community structure of aerobic activated sludge and anaerobic digestion sludge from a full-scale municipal wastewater treatment plant. Over 3.0 gigabases of metagenomic sequence data were generated with the Illumina HiSeq 2000 platform for each sample. Taxonomic analysis by MG-RAST sever indicated bacteria were dominant in both samples, while archaea with a higher abundance were detected in the anaerobic digestion sludge. The aerobic activated sludge was dominated by Proteobacteria, Bacteroidetes, Nitrospirae, and Actinobacteria, while the most abundant bacterial populations were Proteobacteria, Firmicutes, Bacteroidetes, and Actinobacteria in anaerobic digestion sludge. Key microorganisms and nitrogen metabolism in aerobic activated sludge and key microorganisms and pathways involved in methanogenesis were further revealed. Ammonia-oxidizing bacteria (AOB) distinctly dominate over ammonia-oxidizing archaea (AOA) in activated sludge. Denitrification, rather than anammox, is the major pathway to complete nitrogen removal. Meanwhile, the dominant proliferation of Methanosaeta and Methanosarcina, together with the functional affiliation of enzymes-encoding genes (Ack, PTA and ACSS) suggested an acetoclastic methanogenesis is the dominant methanogenesis pathway in anaerobic digester. | |||
TO cite this article:GUO Jianhua,PENG Yongzhen. Metagenomic analysis and comparison of microbial community structure of aerobic activated sludge and anaerobic digestion sludge[OL].[21 May 2016] http://en.paper.edu.cn/en_releasepaper/content/4693657 |
6. Kinetics and microbial community analysis of sludge anaerobic digestion based on Micro-direct current treatment under different initial pH values | |||
Yuan Haiping | |||
Environmental Science and Techology 19 May 2016 | |||
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Abstract:The effects of Micro-direct current treatment (Micro-DC) on anaerobic digestion of sludge under different initial pH values were investigated in this study. Biogas production and VS removal rate tests were conducted to determine the optimum initial pH value based on the Micro-DC treatment, and the evolution of archaeal community was also investigated through high-throughput sequencing method to reveal its mechanism. Furthermore, First-order kinetics, Transfer function model and Cone model were employed to reveal the principle kinetics of methane production from waste activated sludge (WAS). The results showed that the optimum initial pH was 9.0 with the Micro-DC treatment of 0.6 V, with which the methane production could be greatly upgraded with a value of 224 mL CH4/g-VS as well as a VS removal rate of 38.07% after 32 days digestion. Micro-DC treatment with an initial pH value of 9.0 enhanced the microbial activities and avoided the accumulation of volatile fatty acids (VFAs) and free ammonia ([NH3]) and subsequent inhibition, inducing a stable digestion environment. The archaeal community analysis showed that Methanosaeta dominated in the treatments with initial pH values between 5.0 and 9.0, while they were Methanobacterium and Methanoculleus in the treatments at initial pH values of 3 and 11, respectively. Model simulation presented that the Cone model fitted the experiment data better and the calculated parameters indicated that anaerobic digestion of sludge at near-neutral pH values has shorter lag phase and higher hydrolysis rate. Furthermore, positive correlations were found between Methanosaeta relative abundance and biogas production. | |||
TO cite this article:Yuan Haiping. Kinetics and microbial community analysis of sludge anaerobic digestion based on Micro-direct current treatment under different initial pH values[OL].[19 May 2016] http://en.paper.edu.cn/en_releasepaper/content/4690123 |
7. Anaerobic digestion of sludge treated by micro-direct current stimulation: Role of microbial community structure and initial sludge concentrations | |||
Yuan Haiping | |||
Environmental Science and Techology 17 May 2016 | |||
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Abstract:To recover bioenergy from the sludge, electronical-assistant anaerobic digestion was used as an efficient method. The optimal applied voltage was set at 0.6 V with an optimal pH value of 9.0. The effects of different initial sludge concentrations (15-45 g/L) on the performance of sludge anaerobic digestion with Micro-DC treatment were explored. The evolution of microbial community was also investigated through high-throughput sequencing method as well as the biogas production and VS removal. Results showed that the optimal initial sludge concentration was 35g/L with the Micro-DC treatment of 0.6V, and the methane production was 139.4 mL CH4/g-VS as well as a VS removal rate of 46.7% at the end of the digestion time. Microbial community analysis showed that Pseudomonas functioned as hydrolytic bacteria and Methanosaeta an aceticlastic methanogen were dominated in all the reactors. | |||
TO cite this article:Yuan Haiping. Anaerobic digestion of sludge treated by micro-direct current stimulation: Role of microbial community structure and initial sludge concentrations[OL].[17 May 2016] http://en.paper.edu.cn/en_releasepaper/content/4690470 |
8. 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 |
9. Compacted Sewage Sludge as a Barrier for Tailings: the Bacterial Community Structure Diversity in the Compacted Sludge | |||
ZHANG Qing,ZHANG Huyuan,WANG Jinfang | |||
Environmental Science and Techology 24 July 2015 | |||
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Abstract:Compacted sewage sludge barrier for tailings, known as reducing barrier, was innovatively double- functioned liner with its capsulation and elimination to Acid Mine Drainage (AMD) produced by tailings. The research had provided insights regarding the bacterial community structure diversity and dynamics over 75 days in the compacted sewage sludge specimens under 3 different seepage conditions (deionized water (DW), pH 2.1 sulfuric acid water (SA) and the synthetic AMD), by PCR-DGGE technique. The results indicated that at the start point (SP) of seepage, the 41st day (T1) of seepage or at the 75th day (T2) of seepage, under different seepage conditions (DW, SA and AMD), Clostridiales ,Bacillaceae and Carnobacteriaceae dominated in the compacted sewage sludge specimen with different relative abundance ranged from 46.26 % to 10.25 %. Redundancy analysis (RDA) on the influences between environmental factors (pH and heavy metals potential mobility in the compacted sludge specimens) and microbial community structure diversity showed the bacteria such as Carnobacteriaceae, Bacillaceae, Clostridiales Family XI. Incertae Sedis, Clostridiaceae, Lactobacillaceae, Peptoniphilaceae, Ruminococcaceae, Moraxellaceae, Caulobacteraceae, Corynebacteriaceae had positive relation to Zn potential mobility and pH; Carnobacteriaceae, Bacillaceae, Clostridiales Family XI. Incertae Sedis, Clostridiaceae, Micrococcineae, Moraxellaceae, uncertain family bacteria had positive relation with Fe potential mobility; Carnobacteriaceae, Clostridiaceae, Corynebacteriaceae had positive relation to Cd and Ni potential mobility; Ruminococcaceae had positive relation to Cu potential mobility. | |||
TO cite this article:ZHANG Qing,ZHANG Huyuan,WANG Jinfang. Compacted Sewage Sludge as a Barrier for Tailings: the Bacterial Community Structure Diversity in the Compacted Sludge[OL].[24 July 2015] http://en.paper.edu.cn/en_releasepaper/content/4650839 |
10. Indoor heating drives water bacterial growth and community metabolic profile changes in the building tap pipes in winter season | |||
ZHANG Haihan,CHEN Shengnan,BAI Yanru,MA Wenliang,LV Kai | |||
Environmental Science and Techology 11 May 2015 | |||
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Abstract:The growth of bacterial species harbored in the indoor drinking water taps was regulated by external environmental factors, and the people's health and drinking water safe was influenced by water quality of indoor drinking water taps. The indoor temperature increased significantly by indoor heating process. However, the mechanism of effect of indoor heating on bacterial re-growth from indoor drinking water taps was vastly not well understood. In the present work, flow cytometry and BIOLOG techniques were combined to explore the effects of indoor heating process on water bacterial cell concentrations and community metabolic profiles in building tap pipes. The results showed that the temperature of overnight stagnation water in the pipes was 15-17℃, after 10 min flushing of the indoor water taps, the water temperature decreased to 4-6℃. The highest bacterial cell number was observed in before flushing water (overnight stagnation), which is 5-11 times higher than that of flushed water. Meanwhile, the significant higher bacterial community metabolic activity (AWCD590nm) was also found in overnight stagnation water sample. The significant "flushed" and "taps" indicates that the AWCD590nm, and bacterial cell number varied among the taps within the flushed (P<0.01). Heatmap fingerprints and principle component analyses (PCA) revealed that a significant discrimination bacterial cell number and community functional metallic profiles in the overnight stagnation water and flushed water. Serine, Threonine, Glucose-Phosphat, Ketobutyric Acid, Phenylethyl-amine, Glycerol, Putrescine were significantly used by "Before" water samples. Our results suggested that the stagnation water with higher temperature should be discharged before composition. It is therefore that the data from this work can give more information on reasonable utilization of drinking water after stagnation in indoor pipes during the indoor heating process periods. | |||
TO cite this article:ZHANG Haihan,CHEN Shengnan,BAI Yanru, et al. Indoor heating drives water bacterial growth and community metabolic profile changes in the building tap pipes in winter season[OL].[11 May 2015] http://en.paper.edu.cn/en_releasepaper/content/4642162 |
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