Water Research

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ISSN / EISSN : 00431354 / 18792448
Current Publisher: Elsevier BV (10.1016)
Total articles ≅ 20,314
Google Scholar h5-index: 100
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Latest articles in this journal

Qian-Yuan Wu, Yu-Ting Zhou, Wanxin Li, Xiangru Zhang, Ye Du, Hong-Ying Hu
Published: 21 June 2019
Water Research; doi:10.1016/j.watres.2019.06.054

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Daehee Choi, Kyungjin Cho, Jinyoung Jung
Published: 18 June 2019
Water Research; doi:10.1016/j.watres.2019.06.044

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Mariane Yvonne Schneider, Juan Pablo Carbajal, Viviane Furrer, Bettina Sterkele, Max Maurer, Kris Villez
Published: 14 June 2019
Water Research; doi:10.1016/j.watres.2019.06.007

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Noreen E. Kelly, Aisha Javed, Yuko Shimoda, Arthur Zastepa, Susan Watson, Shan Mugalingam, George B. Arhonditsis
Published: 10 June 2019
Water Research; doi:10.1016/j.watres.2019.06.005

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Laura Piai, Jouke Dykstra, Mahesa Gilang Adishakti, Marco Blokland, Alette Langenhoff, Albert Van Der Wal
Published: 6 June 2019
Water Research; doi:10.1016/j.watres.2019.06.012

Abstract:Hydrophilic organic micropollutants are commonly detected in source water used for drinking water production. Effective technologies to remove these micropollutants from water include adsorption onto granular activated carbon in fixed-bed filters. The rate-determining step in adsorption using activated carbon is usually the adsorbate diffusion inside the porous adsorbent. The presence of mesopores can facilitate diffusion, resulting in higher adsorption rates. We used two different types of granular activated carbon, with and without mesopores, to study the adsorption rate of hydrophilic micropollutants. Furthermore, equilibrium studies were performed to determine the affinity of the selected micropollutants for the activated carbons. A pore diffusion model was applied to the kinetic data to obtain pore diffusion coefficients. We observed that the adsorption rate is influenced by the molecular size of the micropollutant as well as the granular activated carbon pore size.
Yanyan Jia, Huiqun Zhang, Samir Kumar Khanal, Linwan Yin, Hui Lu
Published: 5 June 2019
Water Research; doi:10.1016/j.watres.2019.06.010

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Tingting Qian, Li Wang, Chencheng Le, Yan Zhou
Published: 4 June 2019
Water Research; doi:10.1016/j.watres.2019.06.008

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F.J. Rubio-Rincón, D.G. Weissbrodt, C.M. Lopez-Vazquez, L. Welles, B. Abbas, M. Albertsen, P.H. Nielsen, M.C.M. Van Loosdrecht, D. Brdjanovic
Published: 2 June 2019
Water Research; doi:10.1016/j.watres.2019.03.053

Abstract:Populations of “Candidatus Accumulibacter”, a known polyphosphate-accumulating organism, within clade IC have been proposed to perform anoxic P-uptake activity in enhanced biological phosphorus removal (EBPR) systems using nitrate as electron acceptor. However, no consensus has been reached on the ability of “Ca. Accumulibacter” members of clade IC to reduce nitrate to nitrite. Discrepancies might relate to the diverse operational conditions which could trigger the expression of the Nap and/or Nar enzyme and/or to the accuracy in clade classification. This study aimed to assess whether and how certain operational conditions could lead to the enrichment and enhance the denitrification capacity of “Ca. Accumulibacter” within clade IC. To study the potential induction of the denitrifying enzyme, an EBPR culture was enriched under anaerobic–anoxic–oxic (A2O) conditions that, based on fluorescence in situ hybridization and ppk gene sequencing, was composed of around 97% (on a biovolume basis) of affiliates of “Ca. Accumulibacter” clade IC. The influence of the medium composition, sludge retention time (SRT), polyphosphate content of the biomass (poly-P), nitrate dosing approach, and minimal aerobic SRT on potential nitrate reduction were studied. Despite the different studied conditions applied, only a negligible anoxic P-uptake rate was observed, equivalent to maximum 13% of the aerobic P-uptake rate. An increase in the anoxic SRT at the expenses of the aerobic SRT resulted in deterioration of P-removal with limited aerobic P-uptake and insufficient acetate uptake in the anaerobic phase. A near-complete genome (completeness = 100%, contamination = 0.187%) was extracted from the metagenome of the EBPR biomass for the here-proposed “Ca. Accumulibacter delftensis” clade IC. According to full-genome-based phylogenetic analysis, this lineage was distant from the canonical “Ca. Accumulibacter phosphatis”, with closest neighbor “Ca. Accumulibacter sp. UW-LDO-IC” within clade IC. This was cross-validated with taxonomic classification of the ppk1 gene sequences. The genome-centric metagenomic analysis highlighted the presence of genes for assimilatory nitrate reductase (nas) and periplasmic nitrate reductase (nap) but no gene for respiratory nitrate reductases (nar). This suggests that “Ca. Accumulibacter delftensis” clade IC was not capable to generate the required energy (ATP) from nitrate under strict anaerobic-anoxic conditions to support an anoxic EBPR metabolism. Definitely, this study stresses the incongruence in denitrification abilities of “Ca. Accumulibacter” clades and reflects the true intra-clade diversity, which requires a thorough investigation within this lineage.
Cynthia Kalweit, Ernst Stottmeister, Thomas Rapp
Published: 1 June 2019
Water Research; doi:10.1016/j.watres.2019.06.001

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Published: 1 June 2019
Water Research, Volume 156; doi:10.1016/s0043-1354(19)30305-7