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There are 13 papers published in subject: > since this site started. |
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1. 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 |
2. Aerobic sludge granulation facilitated by granular activated carbon for partial nitrification | |||
LI Anjie,HOU Baolian | |||
Environmental Science and Techology 23 June 2014 | |||
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Abstract:Although the use of partial nitrification, or nitritation, for nitrogen removal via nitrite is an energy-saving method for treating high-strength ammonia wastewater, its stable operation with sufficient enrichment of ammonia-oxidizing bacteria (AOB) is difficult to maintain in activated sludge systems. In this study, an aerobic granulation technique was developed for the effective and stable nitritation treatment of ammonia-rich inorganic influent. Granular activated carbon (GAC) was added to the bioreactor to enhance the granulation of slow-growing AOB. The results show that aerobic granules could be formed for partial nitrification through the selective discharge of small and slow-settling sludge flocs, with or without activated carbon addition. However, dosing GAC into the sludge greatly accelerated the granulation process and shortened the granulation period from about 6 weeks to less than 3 weeks with the formation of large and fast-settling granules. Compared to activated sludge flocs, sludge granulation with selective sludge discharge was found to help halt ammonia oxidation to the level of partial nitrification rather than complete nitrification. | |||
TO cite this article:LI Anjie,HOU Baolian. Aerobic sludge granulation facilitated by granular activated carbon for partial nitrification[OL].[23 June 2014] http://en.paper.edu.cn/en_releasepaper/content/4602129 |
3. Study of pattern and products of salting out in treating mustard tuber wastewater by mixed hybrid membrane bioreactor | |||
CHAI Hongxiang,AI Nanping,CHEN Wei | |||
Environmental Science and Techology 01 February 2013 | |||
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Abstract:When treating a mustard tuber wastewater with high concentration of salt and nitrogen by mixed hybrid membrane bioreactor, the salting out could accelerate speed of membrane fouling that would lead to the decrease of membrane flux, even make the membrane useless due to the membrane damage. In order to solve this problem, an experimental research was carried to study of the pattern and the products of salting out in treating mustard tuber wastewater by membrane bioreactor(MBR). According to the analysis of salting out, it could provide theoretical foundations for slowing down and preventing membrane from fouling. The research showed that the crystal precipitation, the filamentous sludge, the grainy sludge and sludge lumping would respectively adhere to the membrane modules when the experimental water temperature was respectively controlled at under 10 C, between 10 C and 15 C, and above 15 C. So it could be concluded that temperature was the main factor of effecting salting out, and lower temperature leaded to more salting out as well as more servere membrane fouling. The degree of salting out of the four situations was crystal precipitation> filamentous sludge adhering> grainy sludge adhering≈sludge lumping. | |||
TO cite this article:CHAI Hongxiang,AI Nanping,CHEN Wei. Study of pattern and products of salting out in treating mustard tuber wastewater by mixed hybrid membrane bioreactor[OL].[ 1 February 2013] http://en.paper.edu.cn/en_releasepaper/content/4515613 |
4. 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 |
5. Preparation and Enhanced Photocatalytic Activity of Heterostructured ZnxCd1-xS/TiO2 nanofibers | |||
Yang Guorui,Yan Wei | |||
Environmental Science and Techology 07 November 2012 | |||
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Abstract:The hierarchical ZnxCd1-xS-TiO2 heterostructures were successfully synthesized by the combination of an electrospinning technique and hydrothermal method. These heterostructures were characterized for the morphological, structural and optical, properties by scanning electron microscopy (SEM), energy-dispersive X-ray analysis (EDS), transmission electron micrography(TEM), X-ray diffraction(XRD) and diffuse reflectance UV/visible absorption spectroscopy(UV-vis). The photocatalytic investigation showed that the ZnxCd1-xS-TiO2 heterostructures possessed enhanced photocatalytic efficiency of photodegradation of Rhodamine B (RhB) compared with the primaryTiO2 nanofibers and sole ZnxCd1-xS nanopaticles prepared via hydrothermal process under UV light irradiation.The composite of different semiconductor may facilitate the photogenerated charge carriers separation and transfer due to the difference in the band edge positions. | |||
TO cite this article:Yang Guorui,Yan Wei. Preparation and Enhanced Photocatalytic Activity of Heterostructured ZnxCd1-xS/TiO2 nanofibers[OL].[ 7 November 2012] http://en.paper.edu.cn/en_releasepaper/content/4493102 |
6. A model of submerged membrane bioreactor removing organic substrate and its applications | |||
Feng Li,Feng Lijuan,Fan Huiju,Zhang Liqiu | |||
Environmental Science and Techology 12 March 2012 | |||
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Abstract:In this paper, ROM model, a kinetics model on organic substrate removal, was established on the basis of material balance in submerged membrane bioreactor (SMBR). According to the model, the organic substrate removal rate is determined by not only the organic substrate concentrations in influent and effluent, hydraulic retention time (HRT), but also the organic substrate concentration removed by membrane module and sludge retention time (SRT). Meanwhile, SRT and the maximum value of mixed liquor volatile suspended solids (MLVSS) without discharging sludge can be determined as well as the concentration of MLVSS can be predicted in reactor. Brewery wastewater was chosen and examined to verify the model and the results showed that the experimental data were coincident with the calculating data. | |||
TO cite this article:Feng Li,Feng Lijuan,Fan Huiju, et al. A model of submerged membrane bioreactor removing organic substrate and its applications[OL].[12 March 2012] http://en.paper.edu.cn/en_releasepaper/content/4470659 |
7. 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 |
8. Magnetically separable mesoporous silica nanocomposite and its application in Fenton catalysis | |||
XIA Min,LONG Mingce,CHEN Chen,CHEN Chao,CAI Weimin,ZHOU Baoxue | |||
Environmental Science and Techology 09 June 2011 | |||
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Abstract:A novel magnetically separable core/shell type nanocomposite was synthesized in a facile way and characterized by XRD, UV-Vis, FT-IR, TEM, Nitrogen physisorption and Magnetite susceptibility measurements. In the synthesis procedure, the mesoporous silica shell was coating on the surface of magnetic core directly via a nano-assembling method. After calcination at high temperature (550 oC) for template removal, the spinel phase of maghemite core was retained without any transformation. The resulting material possessed a regularly hexagonal mesoporous structure with a high specific surface area (908.70 m2/g), which were favorable to further functional modification. Once incorporated with iron species by in situ synthesis, the nanocomposite could serve as a Fenton catalyst and was effective in phenol degradation at the given conditions (40 oC, pH=4). At the end of the reaction, it was easily collected by an external magnetic field and remained efficient in reuse. | |||
TO cite this article:XIA Min,LONG Mingce,CHEN Chen, et al. Magnetically separable mesoporous silica nanocomposite and its application in Fenton catalysis[OL].[ 9 June 2011] http://en.paper.edu.cn/en_releasepaper/content/4431181 |
9. A distributed model for rainfall-runoff and pollutant transport based on transport rate | |||
HE Zhiguo,TAYFUR Gokmen,RAN Qihua | |||
Environmental Science and Techology 18 March 2011 | |||
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Abstract:In this paper, a distributed pollutant transport model was developed using the diffusion wave equation and transport rate-based equation. Finite volume method in space and an implicit backward difference scheme in time were employed in the numerical solution of the two-dimensional governing equations. The developed model was tested against an experimental study involving overland flow and the associated pollutant transport. The satisfactory simulation of the experimental data verifies the accuracy of the model. The developed model can reasonably simulate the high concentration of polluant in overland flow at the early stage of rainstorms. | |||
TO cite this article:HE Zhiguo,TAYFUR Gokmen,RAN Qihua. A distributed model for rainfall-runoff and pollutant transport based on transport rate[OL].[18 March 2011] http://en.paper.edu.cn/en_releasepaper/content/4417152 |
10. Biological municipal wastewater nutrients removal in anaerobic-aerobic (low dissolved oxygen) sequencing batch reactor: effect of organic carbon source addition | |||
Zheng Xiong,Li Hongjing,Tong Juan,Chen Yinguang | |||
Environmental Science and Techology 16 January 2009 | |||
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Abstract:The effect of addition of organic carbon sources (acetic acid and waste activated sludge alkaline fermentation liquid) on anaerobic-aerobic (low dissolved oxygen, 0.15-0.45 mg/L) biological municipal wastewater treatment was investigated. The results showed that carbon source addition affected not only the transformations of polyhydroxyalkanoates (PHA), glycogen, nitrogen and phosphorus, but the net removal of nitrogen and phosphorus. The removal efficiencies of TN and TP were respectively 61% and 61% without organic carbon source addition, 81% and 95% with acetic acid addition, and 83% and 97% with waste activated sludge alkaline fermentation liquid addition. It seems that the alkaline fermentation liquid of waste biosolids generated in biological wastewater treatment plant can be used to replace acetic acid as an additional carbon source to improve the anaerobic-aerobic (low dissolved oxygen) municipal wastewater nutrients removal although its use was observed to cause a slight increase of effluent BOD and COD concentrations. | |||
TO cite this article:Zheng Xiong,Li Hongjing,Tong Juan, et al. Biological municipal wastewater nutrients removal in anaerobic-aerobic (low dissolved oxygen) sequencing batch reactor: effect of organic carbon source addition[OL].[16 January 2009] http://en.paper.edu.cn/en_releasepaper/content/27985 |
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