Yan Jiao

Shanxi University of Finance and Economics, Yangkü, Shanxi Sheng, China

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Publications (10)43.39 Total impact

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    ABSTRACT: A membraneless, liter-scale bioelectrochemical reactor with both bioanode and biocathode was established for landfill leachate treatment. Anoxic/oxic (A/O) zones at anode compartment and cathode compartment, respectively, were connected with a reflux to facilitate nitrogen removal. With raw landfill leachate of 17,500-22,600mgL(-1) chemical oxygen demand (COD) and 1170-1490mgL(-1) NH4(+)-N, the tested reactor removed 89.1±1.6% of chemical oxygen demand and 99.2±0.1% of NH4(+)-N at 3.0kgCODm(-3)d(-1). The corresponding maximum power density was 2.71±0.09Wm(-3), with internal resistance of 46.7±1.6Ω and open circuit voltage of 727±7mV. The species of Pseudomonas, Desulfovibrio, Bacillus, Enterococcus, Pelospora, Dehalobacter dominated the anodic community, while those of methylotrophs, Rhodobacter, Verrucomicrobiaceae, Geobacter, Flavobacterium, Thauera, Desulfovibrio and Aeromonas dominated the cathodic community. The proposed A/O bioelectrochemical reactor is a prototype for practical treatment of landfill leachate at affordable costs. Copyright © 2015 Elsevier Ltd. All rights reserved.
    Bioresource Technology 06/2015; 186. DOI:10.1016/j.biortech.2015.03.022 · 5.04 Impact Factor
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    ABSTRACT: A membraneless bioelectrochemical system (BES) reactor and an anoxic/oxic (A/O) reactor of identical configurations were applied to treat the landfill leachate (20,100mgl(-1) chemical oxygen demand (COD) and 1330mgl(-1) NH4(+)-N) at 24-h hydraulic retention time and 3kgchemical oxygen demandm(-3)d(-1) volume loading. The BES with maximum power density of 2.77±0.26Wm(-3) and internal resistance of 47.5±1.4Ω removed 84-89% COD and 94-98% NH4(+)-N, 11% and 47%, respectively, higher than the A/O reactor. The dissolved organic matters (DOM) in effluents from the BES and the A/O reactor were for the first time characterized and compared. The MFC preferentially degraded hydrophilic fraction (HPI) of the fed DOM and yielded excess humin with high aromaticity. The electric fields by bioelectrochemical reactions occurred at cathode stimulate the activities of COD degraders and nitrifiers in biofilms to enhance ammonium removals by BES reactor. Copyright © 2015 Elsevier Ltd. All rights reserved.
    Bioresource Technology 05/2015; DOI:10.1016/j.biortech.2015.05.082 · 5.04 Impact Factor
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    ABSTRACT: Microbial fuel cell (MFC) is applied to produce electricity using dairy manure as a fuel. Since the way MFC utilizes manure as a fuel and the long-term operation stability of manure-MFC remains unclear, this study examined the evolution of dissolved organic matter (DOM) in anodic chamber and power generation by MFC in a 171days test. The tested MFC can produce electricity over the entire testing period by single feed of manure, with stable power output and total chemical oxygen demand (TCOD) removal rate in the period of day 30-140. The hydrophobic acid (HPO-A) and hydrophilic (HPI) fractions of manure were the principal components of anolyte DOM, with the concentrations of both being reduced over MFC operation. The degradable organic matters were converted to compounds with high aromaticity. Copyright © 2015 Elsevier Ltd. All rights reserved.
    Bioresource Technology 01/2015; 180. DOI:10.1016/j.biortech.2015.01.002 · 5.04 Impact Factor
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    ABSTRACT: Long-term performance is of primary concern when considering the commercialized use of an microbial fuel cell(MFC). The long-term stability of MFC was studied using dairy manure as substrate over a testing time of 171 d. The results showed that the MFC could efficiently recover electricity from dairy manure during the long-time run, and the average power density was 6. 77 Wm-3 +/- 2. 11 W m-3. On day 70, the polarization curve was measured, the open circuit voltage, internal resistance and maximum power density of MFC were 0. 874 V, 22. 1 omega and 14. 1 W.m -3, respectively. The 30-day TCOD removal decreased with increasing test time, and the CE during the 121-150 d period reached 17.5% +/-3.3%. Phylogenetic analyses revealed that the dominant microbial communities in anodic biofilm were Proteobacteria (45%) , Bacteroidetes (22%) , Firmicutes (17% ) and Actinobacteria (11% ). At genera level, the bacteria with electricity production and (or) cellulose degradation ability, such as Clostridium and Cellulomonas were the abundant taxa.
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    ABSTRACT: Effects of cathode types on the long-term stability of microbial fuel cell (MFC) and the anodic microbial communities were studied using K(3)Fe(CN)(6) catholyte (R1), air cathode (R2) and biocathode (R3) over a testing time of 400 d. Upon 400 d of testing, the maximum power densities (P(max)) of R1 and R2 decreased by 44% and 37%, and the Coulombic efficiencies (CEs) decreased 8.4% (R1) and 2.0% (R2), respectively, using the performances on 10d as the comparison basis. Conversely, the P(max) and CE of R3 increased by 68.2% and 116.8%, respectively. The non-ohmic resistances (R(no)) in all tests were the principal contributors of cell internal resistances. Phylogenetic analyses revealed that the microbial communities on anodic surface varied with cathode types and operational history.
    Bioresource Technology 05/2012; 118:249-56. DOI:10.1016/j.biortech.2012.05.015 · 5.04 Impact Factor
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    ABSTRACT: Microbial fuel cells (MFCs) represent a new biological method for generating electricity directly from biodegradable compounds. Efficiency of MFCs using manure as substrate is generally low. This study proposed a new design by incorporating biocathodes into a three-chamber MFC, which yielded maximum power densities much higher than those reported in literature. The new design placed cylindrical anode chamber for easy stirring and two symmetrical cathodic chambers with reduced anode-cathode distance. The biocathodes were applied to reduce charge transfer resistance. Additionally, biocathode microbial community was cultured to enrich favorable microorganisms. With external loading of 100 Ω, the power densities for new biocathode MFC using 2, 4, 6, 8 and 10% total solids diary manure reached 7.85±1.0 W m(-3), 7.84±1.20 W m(-3), 8.15±0.20 W m(-3), 7.60±0.97 W m(-3) and 5.63±0.97 W m(-3), respectively. The pH drop as a result of manure hydrolysis limited the power output. To provide detailed information of the microbial community in the biocathode MFC, the 454-pyrosequencing technique was adopted. The Firmicutes, γ-, β-, α- and δ-Proteobacteria, Bacteroidetes and Actinobacteria were the major groups on the anode, while γ-, β-, and α-Proteobacteria, Bacteroidetes and Actinobacteria were the predominant groups on the cathode.
    Biosensors & Bioelectronics 11/2011; 31(1):537-43. DOI:10.1016/j.bios.2011.11.036 · 6.45 Impact Factor
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    ABSTRACT: Microbial fuel cells (MFCs) with abiotic cathodes require expensive catalyst (such as Pt) or catholyte (such as hexacynoferrate) to facilitate oxidation reactions. This study incorporated biocathodes into a three-chamber MFC to yield electricity from sewage sludge at maximum power output of 13.2 ± 1.7 W/m(3) during polarization, much higher than those previously reported. After 15 d operation, the total chemical oxygen demand (TCOD) removal and coulombic efficiency (CE) of cell reached 40.8 ± 9.0% and 19.4 ± 4.3%, respectively. The anolyte comprised principally acetate and propionate (minor) as metabolites. The use of biocathodes produced an internal resistance of 36-46 Ω, lower than those reported in literature works, hence yielding higher maximum power density from MFC. The massively parallel sequencing technology, 454 pyrosequencing technique, was adopted to probe microbial community on anode biofilm, with dominant phyla belonging to Proteobacteria (45% of total bacteria), Bacteroidetes (19%), Uncultured bacteria (9%), Actinobacteria (7%), Firmicutes (7%), Chloroflex (7%). At genera level, Rhodoferax, Ferruginibacter, Propionibacterium, Rhodopseudomonas, Ferribacterium, Clostridium, Chlorobaculum, Rhodobacter, Bradyrhizobium were the abundant taxa (relative abundances>2.0%).
    Water Research 10/2011; 46(1):43-52. DOI:10.1016/j.watres.2011.10.036 · 5.32 Impact Factor
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    ABSTRACT: The efficiency and sustainability of microbial fuel cell (MFC) are heavily dependent on the cathode performance. We show here that the use of graphite fiber brush (GBF) together with graphite granules (GGs) as a basal material for biocathode (MFC reactor type R1) significantly improve the performance of a MFC compared with MFCs using GGs (MFC reactor type R2) or GFB (MFC reactor type R3) individually. Compared with R3, the use of the combination biocathode (R1) can shorten the start-up time by 53.75%, improve coulombic efficiencies (CEs) by 21.0±2.7% at external resistance (REX) of 500Ω, and increase maximum power densities by 38.2±12.6%. Though the start-up time and open circuit voltage (OCV) of the reactor R2 are similar to R1, the CE (REX=500Ω) and maximum power density of R2 are 21.4±1.7% and 38.2±15.6% lower than that of R1. Fluorescence in situ hybridization (FISH) analyses indicate the bacteria on cathodes of R1 and R2 are richer than that of R3. Molecular taxonomic analyses reveal that the biofilm formed on the biocathode surface is dominated by strains belonging to Nitrobacter, Achromobacter, Acinetobacter, and Bacteroidetes. Combination of GFB and GGs as biocathode material in MFC is more efficient and can achieve sustainable electricity recovery from organic substances, which substantially increases the viability and sustainability of MFCs.
    Journal of Power Sources 08/2011; 196(15):6036-6041. DOI:10.1016/j.jpowsour.2011.03.096 · 5.21 Impact Factor
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    ABSTRACT: In this study, specialized bacteria were domesticated and cultivated with polluted stream water. The bioaugmentation of specialized bacteria would significantly enhance the removal efficiency of TN and NH4+-N from 25.9% to 50.3%, and from 34.5% to 60.1%, respectively. Concomitant increases in the number of microbial communities and the proportion of nitrifying bacteria were also identified by the most probable number (MPN) method. PCR-DGGE profiles revealed that the bacterial community could be successfully enriched and the ammonia-oxidizing bacteria communities were shown predominant by the species of Nitrosomonas. The biological contact oxidation ditch (BCOD) system augmented with specialized bacteria can be a viable alternative for treating polluted stream water to achieve improved nitrogen removal.
    Bioresource Technology 09/2010; 102(2):990-5. DOI:10.1016/j.biortech.2010.09.061 · 5.04 Impact Factor
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    ABSTRACT: Most researchers focused on either nitrogen species or microbial community for polluted urban stream while ignoring the interaction between them and its effect on nitrogen transformation, which restricted the rational selection of an effective and feasible remediation technology. Taking Buji stream in Shenzhen (China) as target stream, the distribution of nitrogen-related bacteria was investigated by most probable number (MPN) besides analysis of nitrogen species etc. The nitrogen-related bacteria in sediment were 10(2) times richer than those in water. Owing to their faster growth, the MPN of ammonifying bacteria and denitrifying bacteria were 10(5) and 10(2) times higher than those of nitrifying bacteria, respectively. The ammonifying bacteria numbers were significantly related to BOD5 in water, while nitrifying bacteria in sediment correlated well with nitrate in water. Thus, nitrification occurred mainly in sediment surface and was limited by low proportion of nitrifying bacteria. The denitrifying bacteria in sediment had good relationship with BOD5 and nitrite and nitrate in water. Low DO and rich organic compounds were beneficial to denitrification but unfavourable to nitrification. Denitrification was restricted by low nitrite and nitrate concentration. These results could be served as a reference for implementing the remediation scheme of nitrogen polluted urban stream.
    Water Science & Technology 09/2009; 60(6):1597-605. DOI:10.2166/wst.2009.502 · 1.21 Impact Factor