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| 1 | Bio-reduction of nitrate from groundwater using a hydrogen-based membrane biofilm reactor显示文摘A hydrogen-based membrane biofilm reactor(MBfR) using H2 as electron donor was investigated to remove nitrate from groundwater.When nitrate was first introduced to the MBfR,denitrification took place on the shell side of the membranes immediately,and the effluent concentration of nitrate continuously decreased with 100% removal rate on day 45 under the influent nitrate concentration of 5 mg NO3--N/L,which described the acclimating and enriching process of autohydrogenotrophic denitrification bacteria.A series of short-term experiments were applied to investigate the effects of hydrogen pressures and nitrate loadings on denitrification.The results showed that nitrate reduction rate improved as H2 pressure increasing,and over 97% of total nitrogen removal rate was achieved when the nitrate loading increased from 0.17 to 0.34 g NO3--N/(m2 ·day) without nitrite accumulation.The maximum denitrification rate was 384 g N/(m3 ·day).Partial sulfate reduction,which occurred in parallel to nitrate reduction,was inhibited by denitrififcation due to the competition for H2 .This research showed that MBfR is effective for removing nitrate from the contaminated groundwater. | Siqing Xia Fohua Zhong Yanhao Zhang Haixiang Li Xin Yang | 2010 | Journal of Environmental Sciences2010，22，2： | 23 |
| 2 | Changes of Cu, Zn, and Ni chemical speciation in sewage sludge co-composted with sodium sulfide and lime显示文摘批 composting 研究被执行与钠硫化物和石灰(SSL ) 混合(Na2S/CaO=1:1 ) 评估堆肥 co 污水污泥的可行性,瞄准减少在污泥堆肥的重金属的可获得性。有 bulking 在 3% 点与 SSL 被修改的锯屑的污水污泥(w/w, dw ) ,并且为在实验室批反应堆的 15 d 的 composted。Tessier 顺序的抽出法的四个阶段被采用与 SSL 在污水污泥 composted 在 Cu, Zn,和 Ni 的重金属部分调查变化。为所有三金属,活动部分,例如,可交换并且绑的碳酸盐主要被转变成低可获得性部分(有机物和硫化物, Fe-Mn 氧化物界限和剩余形式) ,并且 SSL 的增加提高了这转变。因此, SSL 是到有污水污泥的合作堆肥的合适的材料减少重金属的可获得性。根据卷心菜种子发芽试验,≤ 3 % 的一个 SSL 修正案(w/w, dw ) 与污水污泥被推荐到合作堆肥。 | WANG Xuejiang CHEN Ling XIA Siqing ZHAO Jianfu | 2008 | Journal of Environmental Sciences2008，20，2： | 17 |
| 3 | Study of 4-t-octylphenol degradation and microbial community in granular sludge显示文摘在这研究,作者在小粒的污泥在 4-t-octylphenol (4-t-OP ) 的氧气、厌氧的降级上调查了各种各样的因素的效果。在比较,氧气的降级率比厌氧的降级的高得多。为在小粒的污泥的 4-t-OP 降级的最佳的 pH 分别地在氧气、厌氧的条件下面是 9 和 7。并且降级率随起始的 4-t-OP 集中的增加减少了。象酚那样的酵母摘录或相应混合物的增加也提高了 4-t-OP 降级,特别在氧气的条件下面。为了在这调查细菌的社区,学习,使中毒的坡度胶化电气泳动(DGGE ) 方法被使用基于教材,为细菌的 16S rDNA V3 区域。γ - proteobacteria 和杆菌作为污泥的主要种类被识别。 | LIU Yi WANG Feng XIA Siqing ZHAO Jianfu | 2008 | Journal of Environmental Sciences2008，20，2： | 14 |
| 4 | Cr(VI) removal from aqueous solution with bamboo charcoal chemically modified by iron and cobalt with the assistance of microwave显示文摘Bamboo charcoal (BC) was used as starting material to prepare Co-Fe binary oxideloaded adsorbent (Co-Fe-MBC) through its impregnation in Co(NO3)2 , FeCl3 and HNO3 solutions simultaneously, followed by microwave heating. The low-cost composite was characterized and used as an adsorbent for Cr(VI) removal from water. The results showed that a cobalt and iron binary oxide (CoFe2O4 ) was uniformly formed on the BC through redox reactions. The composite exhibited higher surface area (331 m2/g) than that of BC or BC loaded with Fe alone (Fe-MBC). The adsorption of Cr(VI) strongly depended on solution pH, temperature and ionic strength. The adsorption isotherms followed the Langmuir isotherm model well, and the maximum adsorption capacities for Cr(VI) at 288 K and pH 5.0 were 35.7 and 51.7 mg/g for Fe-MBC and Co-Fe-MBC, respectively. The adsorption processes were well fitted by the pseudo second-order kinetic model. Thermodynamic parameters showed that the adsorption of Cr(VI) onto both adsorbents was feasible, spontaneous, and exothermic under the studied conditions. The spent Co-Fe-MBC could be readily regenerated for reuse. | Wei Wang Xuejiang Wang Xin Wang Lianzhen Yang Zhen Wu Siqing Xia Jianfu Zhao | 2013 | Journal of Environmental Sciences2013，25，9： | 14 |
| 5 | Simultaneous removal of selected oxidized contaminants in groundwater using a continuously stirred hydrogen-based membrane biofilm reactor显示文摘A laboratory trial was conducted for evaluating the capability of a continuously stirred hydrogen-based membrane biofilm reactor to simultaneously reduce nitrate (NO3--N), sulfate (SO42-), bromate (BrO3-), hexavalent chromium (Cr(VI)) and para- chloronitrobenzene (p-CNB). The reactor contained two bundles of hollow fiber membranes functioning as an autotrophic biofilm carrier and hydrogen pipe as well. On the condition that hydrogen was supplied as electron donor and diffused into water through membrane pores, autohydrogenotrophic bacteria were capable of reducing contaminants to forms with lower toxicity. Reduction occurred within 1 day and removal fluxes for NO3--N, SO4-2 , BrO3-, Cr(VI), and p-CNB reached 0.641, 2.396, 0.008, 0.016 and 0.031 g/(day·m-2 ), respectively after 112 days of continuous operation. Except for the fact that sulfate was 37% removed under high surface loading, the other four contaminants were reduced by over 95%. The removal flux comparison between phases varying in surface loading and H2 pressure showed that decreasing surface loading or increasing H2 pressure would promote removal flux. Competition for electrons occurred among the five contaminants. Electron-equivalent flux analysis showed that the amount of utilized hydrogen was mainly controlled by NO3 -N and SO4-2 reduction, which accounted for over 99% of the electron flux altogether. It also indicated the electron acceptor order, showing that nitrate was the most prior electron acceptor while sulfate was the second of the five contaminants. | Siqing Xia Jun Liang Xiaoyin Xu Shuang Shen | 2013 | Journal of Environmental Sciences2013，25，1： | 8 |
| 6 | New insight into adsorption characteristics and mechanisms of the biosorbent from waste activated sludge for heavy metals显示文摘The adsorption characteristics and mechanisms of the biosorbent from waste activated sludge were investigated by adsorbing Pb2+and Zn2+in aqueous single-metal solutions. A p H value of the metal solutions at 6.0 was beneficial to the high adsorption quantity of the biosorbent. The optimal mass ratio of the biosorbent to metal ions was found to be 2. A higher adsorption quantity of the biosorbent was achieved by keeping the reaction temperature below 55°C. Response surface methodology was applied to optimize the biosorption processes, and the developed mathematical equations showed high determination coefficients(above 0.99 for both metal ions) and insignificant lack of fit(p = 0.0838 and 0.0782 for Pb2+and Zn2+, respectively). Atomic force microscopy analyses suggested that the metal elements were adsorbed onto the biosorbent surface via electrostatic interaction. X-ray photoelectron spectroscopy analyses indicated the presence of complexation(between –NH2,-CN and metal ions) and ion-exchange(between –COOH and metal ions). The adsorption mechanisms could be the combined action of electrostatic interaction, complexation and ion-exchange between functional groups and metal ions. | Yun Zhou Zhiqiang Zhang Jiao Zhang Siqing Xia | 2016 | Journal of Environmental Sciences2016，28，7： | 7 |
| 7 | Pb(Ⅱ) removal from water using Fe-coated bamboo charcoal with the assistance of microwaves显示文摘Bamboo charcoal(BC) was used as starting material to prepare iron-modified bamboo charcoal(Fe-MBC) by its impregnation in FeCl 3 and HNO 3 solutions simultaneously,followed by microwave heating.The material can be used as an adsorbent for Pb(Ⅱ) contaminants removal in water.The composites were prepared with Fe molar concentration of 0.5,1.0 and 2.0 mol/L and characterized by means of N 2 adsorption-desorption isotherms,X-ray diffraction spectroscopy(XRD),scanning electron microscopy coupled with energy dispersive X-ray spectrometry(SEM-EDS),Fourier transform infrared(FT-IR) and point of zero charge(pH pzc) measurements.Nitrogen adsorption analyses showed that the BET specific surface area and total pore volume increased with iron impregnation.The adsorbent with Fe molar concentration of 2 mol/L(2Fe-MBC) exhibited the highest surface area and produced the best pore structure.The Pb(Ⅱ) adsorption process of 2Fe-MBC and BC were evaluated in batch experiments and 2Fe-MBC showed an excellent adsorption capability for removal Pb(Ⅱ).The adsorption of Pb(Ⅱ) strongly depended on solution pH,with maximum values at pH 5.0.The ionic strength had a significant effect on the adsorption at pH < 6.0.The adsorption isotherms followed the Langmuir isotherm model well,and the maximum adsorption capacity for Pb(Ⅱ) was 200.38 mg/g for 2Fe-MBC.The adsorption processes were well fitted by a pseudo second-order kinetic model.Thermodynamic parameters showed that the adsorption of Pb(Ⅱ) onto Fe-MBC was feasible,spontaneous,and exothermic under the studied conditions,and the ion exchange mechanism played an significant role.These results have important implications for the design of low-cost and effective adsorbents in the removal of Pb(Ⅱ) from wastewater. | Zengsheng Zhang Xuejiang Wang Yin Wang Siqing Xia Ling Chen Yalei Zhang Jianfu Zhao | 2013 | Journal of Environmental Sciences2013，25，5： | 6 |
| 8 | Enhanced struvite recovery from wastewater using a novel cone-inserted fluidized bed reactor显示文摘The feasibility of struvite recovery at low(12.5 mg/L) and high(120 mg/L) phosphorus concentrations was studied by constructing a novel fluidized bed reactor with cones(FBRwc) and without cones(FBRwoc). The crystallization process was continuously operated for 133 days under different hydraulic retention times(HRT = 1–10 hr), pH(7.5–10), and molar ratios of Mg/P(0.75–1.75), N/P(1–10) and Ca/Mg(0–2). The optimum operating conditions of HRT, pH, Mg/P and N/P molar ratios were found to be 2 hr, 9, 1.25, and 7.5, respectively. Under these optimum conditions, the phosphorus precipitation efficiencies of FBRwcwere 93% for low and 98% for high phosphorus influent; however, the efficiencies were 78% and 81% for FBRwoc, respectively. Due to crystal losses at each junction(17%–31%), the crystal recovery efficiency of FBRwocwas relatively low(47%–65%) for both influent concentrations. However, the losses were minimal in FBRwc, which showed 75% and 92% crystal recovery for low and high phosphorus concentrations, respectively. At low calcium concentration, crystal chemical analysis showed the product to be pure struvite(> 99%). The scanning electron microscope and X-ray diffraction results further confirmed that the crystal recovered from FBRwc contained pure struvite, which could be considered a high quality fertilizer. Except HRT, all parameters(pH, Mg/P, N/P and Ca/Mg) were found to be influencing factors for FBRwcperformance. Overall, inserting cones in each part of the reactor played a significant role in enhancing struvite recovery from a wide range of phosphorus-containing wastewater. | Awoke Guadie Siqing Xia Wei Jiang Lijie Zhou Zhiqiang Zhang Slawomir W.Hermanowicz Xiaoyin Xu Shuang Shen | 2014 | Journal of Environmental Sciences2014，26，4： | 6 |
| 9 | Study on membrane fouling of submerged membrane bioreactor in treating bathing wastewater显示文摘A pilot-scale submerged membrane bioreactor (MBR) was used to treat the bathing wastewater for more than 90 d. Several factors affecting membrane fouling were studied, including the variation in transmembrane pressure (TMP), changes in extracellular polymeric substance (EPS), and distribution of membrane resistance (R). The relationships between R and EPS concentration were found to be R = 0.00008(EPSS)2.915 in the mixed liquor (EPSS) and R = 0.2853(EPSm) - 0.824 on the membrane surface (EPSm). The constant resistance of the clean membrane (Rm), the resistance due to concentration polarization (Rp), the cake layer resistance (Rc), and the resistance due to pore blocking (Ri), were 0.006%, 20.15%, 54.13%, and 25.72% of R, respectively. The results indicated that Rc had the greatest contribution to the total membrane resistance. The obtained membrane resistance model was R(t) = 4.609 × 108(1 + 0.01t)0.5. Molecular-based methods (polymerase chain reaction-denaturing gel gradient electrophoresis (PCR-DGGE) and ?uorescent in situ hybridization (FISH)) were used to study the bacteria attached on the membrane. The 16S rDNA gene sequence analysis suggested that certain phylogenetic group of bacteria, for example, Pseudomonas sp. and Nitrobacter sp., might have contributed to the formation of membrane on biofilms. | Jifeng GUO Jianfu ZHAO | 2008 | Journal of Environmental Sciences2008，20，10： | 6 |
| 10 | Arsenic removal from groundwater by acclimated sludge under autohydrogenotrophic conditions显示文摘Arsenic in the environment is attracting increasing attention due to its chronic health effects. Although arsenite(As(III)) is generally more mobile and more toxic than arsenate(As(V)), reducing As(V) to As(III) may still be a means for decontamination, because As(III) can be removed from solution by precipitation with sulfide or by adsorption or complexation with other metal sulfides. The performance of As(V) bio-reduction under autohydrogenotrophic conditions was investigated with batch experiments. The results showed that As(V) reduction was a biochemical process while both acclimated sludge and hydrogen were essential. Most of the reduced arsenic remained in a soluble form, although 20% was removed with no addition of sulfate, while 82% was removed when sulfate was reduced to sulfide. The results demonstrated that the reduced arsenic was re-sequestered in the precipitates, probably as arsenic sulfides. Kinetic analysis showed that pseudo first-order kinetics described the bio-reduction process better than pseudo second-order. In particular, the influences of pH and temperature on As(V) reduction by acclimated sludge under autohydrogenotrophic conditions and total soluble As removal were examined. The reduction process was highly sensitive to both pH and temperature, with the optimum ranges of pH 6.5–7.0 and 30–40°C respectively. Furthermore, Arrhenius modeling results for the temperature effect indicated that the As(V) reduction trend was systematic. Total soluble As removal was consistent with the trend of As(V) reduction. | Siqing Xia Shuang Shen Xiaoyin Xu Jun Liang Lijie Zhou | 2014 | Journal of Environmental Sciences2014，26，2： | 5 |
| 11 | Influence and mechanism of N-(3-oxooxtanoyl)-L-homoserine lactone(C_8-oxo-HSL) on biofilm behaviors at early stage显示文摘N-acyl-homoserines quenching,enzymatic quenching of bacterial quorum sensing,has recently applied to mitigate biofilm in membrane bioreactor.However,the effect of AHLs on the behavior of biofilm formation is still sparse.In this study,Pseudomonas aeruginosa biofilm was formed on ultra-filtration membrane under a series of N-(3-oxooxtanoyl)-L-homoserine lactone(C8-oxo-HSL)concentrations.Diffusing C8-oxo-HSL increased the growth rate of cells on biofilm where the concentration of C8-oxo-HSL was over 10-7g/L.The C8-oxo-HSL gradient had no observable influence on cell density and extracellular polymeric substances of biofilm with over 10-7g/L C8-oxo-HSL.Surprisingly,10-11-10-8g/L of C8-oxo-HSL had no effect on cell growth in liquid culture.The cell analysis demonstrated that the quorum sensing system might enhance the growth of neighboring cells in contact with surfaces into biofilm and may influence the structure and organization of biofilm. | Siqing Xia Lijie Zhou Zhiqiang Zhang Jixiang Li | 2012 | Journal of Environmental Sciences2012，24，12： | 4 |
| 12 | Interactions between metal ions and the biopolymer in activated sludge: quantification and effects of system pH value显示文摘 | Yun Zhou Siqing Xia Binh T. Nguyen Min Long Jiao Zhang Zhiqiang Zhang | 2017 | Frontiers of Environmental Science & Engineering2017，11，1： | 4 |
| 13 | Bioreduction of vanadium(V) in groundwater by autohydrogentrophic bacteria:Mechanisms and microorganisms显示文摘As one of the transition metals, vanadium(V)(V(V)) in trace amounts represents an essential element for normal cell growth, but becomes toxic when its concentration is above 1 mg/L. V(V) can alter cellular differentiation, gene expression, and other biochemical and metabolic phenomena. A feasible method to detoxify V(V) is to reduce it to V(IV), which precipitates and can be readily removed from the water. The bioreduction of V(V) in a contaminated groundwater was investigated using autohydrogentrophic bacteria and hydrogen gas as the electron donor. Compared with the previous organic donors,H2 shows the advantages as an ideal electron donor, including nontoxicity and less production of excess biomass. V(V) was 95.5% removed by biochemical reduction when autohydrogentrophic bacteria and hydrogen were both present, and the reduced V(IV)precipitated, leading to total-V removal. Reduction kinetics could be described by a first-order model and were sensitive to p H and temperature, with the optimum ranges of p H 7.5–8.0 and 35–40°C, respectively. Phylogenetic analysis by clone library showed that the dominant species in the experiments with V(V) bioreduction belonged to theβ-Proteobacteria. Previously known V(V)-reducing species were absent, suggesting that V(V)reduction was carried out by novel species. Their selective enrichment during V(V)bioreduction suggests that Rhodocyclus, a denitrifying bacterium, and Clostridium, a fermenter known to carry out metal reduction, were responsible for V(V) bioreduction. | Xiaoyin Xu Siqing Xia Lijie Zhou Zhiqiang Zhang Bruce E.Rittmann | 2015 | Journal of Environmental Sciences2015，27，4： | 4 |
| 14 | Study on removing selenate from groundwater by autohydrogenotrophic microorganisms显示文摘 | Siqing XIA Shuang SHEN Jun LIANG Xiaoyin XU | 2013 | Frontiers of Environmental Science & Engineering2013，7，4： | 2 |
| 15 | Comparison of general practice residents’ attitudes and perceptions about training in two programmes in China: a mixed methods survey显示文摘Objective To understand general practice(GP)residents’attitudes about their residency training in China.Design Mixed methods survey administered cross-sectionally.Setting Two GP training programmes similar in most regards according to current GP training policy of 5 years’undergraduate degree in medicine and 3 years of postgraduate GP residency training-but differing as the Beijing programme has adopted educational innovations beyond the nationally prescribed standard curriculum used by the second Shenzhen programme.Participants 105(85%)of eligible GP trainees,35(90%)in the innovative Beijing programme and 70(83%)in the standard training Shenzhen programme.Results Overall,residents felt discrimination because of specialty choice,and that they lacked competency as a general practitioner.Many residents commented faculty had negative teaching attitudes.Beijing residents were more satisfied than Shenzhen residents with their training(p=0.001),and felt teaching faculty had sufficient knowledge(p<0.001),and appropriate attitudes towards teaching(p=0.004).Beijing residents more strongly agreed on five items about good future job prospects(all p<0.05).Conclusion These Chinese GP residents identify areas for improvement in their training as well as strengths.Higher satisfaction with faculty teaching and job optimism in Beijing where GP residents receive training from specifically qualified faculty,and can earn special certification,suggest that the educational innovations enhance training and promote positivity about job prospects.These findings imply that GP residents in China face many training challenges that are similar to other international reports,while also implicating benefits of using an innovative curricular approach. | Siqing Lian Yu Xia Jinzhi Zhang Xiaoning Han Chunhua Chi Michael D Fetters | 2019 | Family Medicine and Community Health2019，7，4： | 2 |
| 16 | Enhanceddewatering of waste sludge with microbial flocculant TJ-F1 as anovel coditioner显示文摘 | ZHANG Zhiqiang XIA Siqing ZHANG Jiao | 2010 | Water Res2010，44，： | 1 |
| 17 | Biosorption of Cu(II) and Pb(II) from aqueous solutionsby dried activated sludge显示文摘 | Wang Xuejiang Chen Ling Xia Siqing | 2006 | Minerals Engineering2006，，19： | 1 |
| 18 | Production and characterization of a bioflocculant by Proteus mirabilis TJ-1 显示文摘 | Xia Siqing Zhang Zhiqiang Wang Xuejiang | 2008 | Bioresour Technol2008，99，14： | 1 |
| 19 | Character- ization and flocculation mechanism of high efficiency mi- crobial flocculant: TJ-FL from proteus mirabilis 显示文摘 | Zhang Zhiqiang Xia Siqing Zhao Jianfu | 2010 | Colloids 'and Surfaces B : Biointerfaces2010，75，1： | 1 |
| 20 | Photocat-alytic degradation of Bisphenol A(BPA)using immobilizedTiO2and UV illumination in a horizontal circulating bed photo-catalytic reactor(HCBPR)显示文摘 | WANG Rongchang REN Dianjun XIA Siqing | 2009 | Journal of Hazardous Materi-als2009，36，4： | 1 |
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