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editorial
. 2024 Mar 9;22:100218. doi: 10.1016/j.wroa.2024.100218

Research stories along the urban water cycle

Treavor H Boyer a,⁎, Wolfgang Gernjak b,c
PMCID: PMC10955406  PMID: 38516567

Water Research X was launched as a separate journal in January 2023 (Yuan and Morgenroth, 2023) and started publishing articles in its new research narrative format in May 2023 (Boyer and Gernjak, 2023). The scope of Water Research X covers the science and technology of the anthropogenic water cycle. This editorial looks at the research articles published in Water Research X since May 2023 and the topics that have resonated with authors and reviewers. Specifically, this editorial follows water as it flows through the urban water cycle to highlight research trends published in the journal.

For this story, the urban water cycle begins at wastewater treatment, where technological innovations, environmental impacts, and human activities all converge. For example, advancing the performance of biological wastewater treatment through processes like anammox, granular sludge, and enhanced biological phosphorus removal (An et al., 2023; Nguyen et al., 2023; Wen et al., 2023; Yin et al., 2023; Zhang et al., 2024; Zheng et al., 2023) reflect the need for wastewater plants to do more. Wastewater treatment advancements also benefit from understanding the interactions of microbial communities (Gao et al., 2023; Kim et al., 2023), and research on underexplored areas such as microbial predation and parasitism (Kuroda et al., 2023). In addition to centralized wastewater treatment, decentralized treatment also needs innovative solutions, such as stormwater and rainwater harvesting and nutrient recovery from waste streams (Keller, 2023). And as wastewater treatment plants do more, it is important to quantify the impacts of wastewater operations on the environment such as greenhouse gas emissions (Bai et al., 2023) and sewer integrity (Zhou et al., 2023). Finally, the constituents in wastewater provide a window to the communities that generate the wastewater such as use of psychoactive substances (Bade et al., 2023).

Following wastewater discharge, and sewer overflows, into the natural aquatic environment (Furrer et al., 2023), microplastics have captured considerable attention. Research challenges include detecting microplastics and nanoplastics (Chen et al., 2023), and quantifying their interactions with natural minerals and contaminants (He et al., 2023). Stormwater runoff also enters the natural aquatic environment, with research investigating strategies to mitigate release for per- and polyfluoroalkyl substances (Vo et al., 2023) and phosphorus interactions with sediment (Wang et al., 2023). Research on the natural aquatic environment goes beyond freshwater quality to include coastal ecosystems (Lo et al., 2023) and the availability of water resources influenced by climate change and drought (Penny et al., 2023).

Surface water, groundwater, and seawater serve as sources of water for communities. Drinking water treatment technologies need improved ways to treat diverse water sources and remove legacy and emerging contaminants. For example, capacitive deionization for brackish water desalination (Tan et al., 2023) and designing new adsorbents for per- and polyfluoroalkyl substances (Yan and Liu, 2023). There is also the need for new and improved ways to inactivate microorganisms such as UV LEDs (Uppinakudru et al., 2023) and photocatalytic membranes (Zhong et al., 2023). Hot water is an important use of potable water in homes and buildings where it consumes considerable energy with associated greenhouse gas emissions (Kenway et al., 2023) and can harbor opportunistic pathogens in hot water pipes of different materials (Cullom et al., 2023), and the pathogen risk of building water systems can be worsened by stagnant water conditions (Huang et al., 2023). Finally, many physical-chemical water treatment technologies have been adapted for wastewater treatment, especially waste streams like human urine and the details of pharmaceutical adsorption to activated carbon (Heusser et al., 2023).

An increasingly important component of the urban water cycle is water reuse, whether for agriculture (Yalin et al., 2023), industrial (Choi et al., 2024), or human consumption (Mackey et al., 2023). We welcome authors to submit their research from across the urban water cycle and look forward to the important stories that the research tells.

CRediT authorship contribution statement

Treavor H. Boyer: Writing – original draft, Conceptualization. Wolfgang Gernjak: Writing – review & editing, Conceptualization.

Declaration of competing interest

The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.

Data availability

  • No data was used for the research described in the article

References

  1. An Z., Wang J., Zhang X., Bott C.B., Angelotti B., Brooks M., Wang Z.-W. Coupling physical selection with biological selection for the startup of a pilot-scale, continuous flow, aerobic granular sludge reactor without treatment interruption. Water Res. X. 2023;19 doi: 10.1016/j.wroa.2023.100186. [DOI] [PMC free article] [PubMed] [Google Scholar]
  2. Bade R., Rousis N., Adhikari S., Baduel C., Bijlsma L., Bizani E., Boogaerts T., Burgard D.A., Castiglioni S., Chappell A., Covaci A., Driver E.M., Sodre F.F., Fatta-Kassinos D., Galani A., Gerber C., Gracia-Lor E., Gracia-Marín E., Halden R.U., Heath E., Hernandez F., Jaunay E., Lai F.Y., Lee H.-J., Laimou-Geraniou M., Oh J.-E., Olafsdottir K., Phung K., Castro M.P., Psichoudaki M., Shao X., Salgueiro-Gonzalez N., Feitosa R.S., Gomes C.S., Subedi B., Löve A.S.C., Thomaidis N., Tran D., van Nuijs A., Verovšek T., Wang D., White J.M., Yargeau V., Zuccato E., Mueller J.F. Three years of wastewater surveillance for new psychoactive substances from 16 countries. Water Res. X. 2023;19 doi: 10.1016/j.wroa.2023.100179. [DOI] [PMC free article] [PubMed] [Google Scholar]
  3. Bai M., Wang Z., Lloyd J., Seneviratne D., Flesch T., Yuan Z., Chen D. Long-term onsite monitoring of a sewage sludge drying pan finds methane emissions consistent with IPCC default emission factor. Water Res. X. 2023;19 doi: 10.1016/j.wroa.2023.100184. [DOI] [PMC free article] [PubMed] [Google Scholar]
  4. Boyer T.H., Gernjak W. Why stories matter in water research: a case for narrative style paper writing. Water Res. X. 2023;21 doi: 10.1016/j.wroa.2023.100198. [DOI] [PMC free article] [PubMed] [Google Scholar]
  5. Chen Z., Shi X., Zhang J., Wu L., Wei W., Ni B.-J. Nanoplastics are significantly different from microplastics in urban waters. Water Res. X. 2023;19 doi: 10.1016/j.wroa.2023.100169. [DOI] [PMC free article] [PubMed] [Google Scholar]
  6. Choi S.-J., Crane L., Kang S., Boyer T.H., Perreault F. Removal of urea in ultrapure water system by urease-coated reverse osmosis membrane. Water Res. X. 2024;22 doi: 10.1016/j.wroa.2024.100211. [DOI] [PMC free article] [PubMed] [Google Scholar]
  7. Cullom A., Spencer M.S., Williams M.D., Falkinham J.O., Pruden A., Edwards M.A. Influence of pipe materials on in-building disinfection of P. aeruginosa and A. baumannii in simulated hot water plumbing. Water Res. X. 2023;21 doi: 10.1016/j.wroa.2023.100189. [DOI] [PMC free article] [PubMed] [Google Scholar]
  8. Furrer V., Mutzner L., Ort C., Singer H. Micropollutant concentration fluctuations in combined sewer overflows require short sampling intervals. Water Res. X. 2023;21 doi: 10.1016/j.wroa.2023.100202. [DOI] [PMC free article] [PubMed] [Google Scholar]
  9. Gao Y., Croze B., Birch Q.T., Nadagouda M.N., Mahendra S. Sorghum-grown fungal biocatalysts for synthetic dye degradation. Water Res. X. 2023;19 doi: 10.1016/j.wroa.2023.100181. [DOI] [PMC free article] [PubMed] [Google Scholar]
  10. He J., Han L., Ma W., Xu C., Xu E.G., Ma C., Xing B., Yang Z. Mechanism insight into the facet-dependent photoaging of polystyrene microplastics on hematite in freshwater. Water Res. X. 2023;19 doi: 10.1016/j.wroa.2023.100185. [DOI] [PMC free article] [PubMed] [Google Scholar]
  11. Heusser A., Dax A., McArdell C.S., Udert K.M. High content of low molecular weight organics does not always affect pharmaceutical adsorption on activated carbon: the case of acetate, propionate and ethanol in source-separated urine. Water Res. X. 2023;21 doi: 10.1016/j.wroa.2023.100199. [DOI] [PMC free article] [PubMed] [Google Scholar]
  12. Huang C.K., Weerasekara A., Lu J., Carter R., Weynberg K.D., Thomson R., Bell S., Guo J. Extended water stagnation in buildings during the COVID-19 pandemic increases the risks posed by opportunistic pathogens. Water Res. X. 2023;21 doi: 10.1016/j.wroa.2023.100201. [DOI] [PMC free article] [PubMed] [Google Scholar]
  13. Keller J. Why are decentralised urban water solutions still rare given all the claimed benefits, and how could that be changed? Water Res. X. 2023;19 doi: 10.1016/j.wroa.2023.100180. [DOI] [PMC free article] [PubMed] [Google Scholar]
  14. Kenway S.J., Pamminger F., Yan G., Hall R., Lam K.L., Skinner R., Olsson G., Satur P., Allan J. Opportunities and challenges of tackling Scope 3 “Indirect” emissions from residential hot water. Water Res. X. 2023;21 doi: 10.1016/j.wroa.2023.100192. [DOI] [PMC free article] [PubMed] [Google Scholar]
  15. Kim J., Hwangbo M., Shih C.-H., Chu K.-H. Advances and perspectives of using stable isotope probing (SIP)-based technologies in contaminant biodegradation. Water Res. X. 2023;20 doi: 10.1016/j.wroa.2023.100187. [DOI] [PMC free article] [PubMed] [Google Scholar]
  16. Kuroda K., Tomita S., Kurashita H., Hatamoto M., Yamaguchi T., Hori T., Aoyagi T., Sato Y., Inaba T., Habe H., Tamaki H., Hagihara Y., Tamura T., Narihiro T. Metabolic implications for predatory and parasitic bacterial lineages in activated sludge wastewater treatment systems. Water Res. X. 2023;20 doi: 10.1016/j.wroa.2023.100196. [DOI] [PMC free article] [PubMed] [Google Scholar]
  17. Lo L.S.H., Liu X., Liu H., Shao M., Qian P.-Y., Cheng J. Aquaculture bacterial pathogen database: pathogen monitoring and screening in coastal waters using environmental DNA. Water Res. X. 2023;20 doi: 10.1016/j.wroa.2023.100194. [DOI] [PMC free article] [PubMed] [Google Scholar]
  18. Mackey E., Hofmann R., Festger A., Vanyo C., Moore N., Chen T., Wang C., Taylor-Edmonds L., Andrews S.A. UV-chlorine advanced oxidation for potable water reuse: a review of the current state of the art and research needs. Water Res. X. 2023;19 doi: 10.1016/j.wroa.2023.100183. [DOI] [PMC free article] [PubMed] [Google Scholar]
  19. Nguyen P.Y., Marques R., Wang H., Reis M.A.M., Carvalho G., Oehmen A. The impact of pH on the anaerobic and aerobic metabolism of Tetrasphaera-enriched polyphosphate accumulating organisms. Water Res. X. 2023;19 doi: 10.1016/j.wroa.2023.100177. [DOI] [PMC free article] [PubMed] [Google Scholar]
  20. Penny J., Khadka D., Alves P.B.R., Chen A.S., Djordjević S. Using multi criteria decision analysis in a geographical information system framework to assess drought risk. Water Res. X. 2023;20 doi: 10.1016/j.wroa.2023.100190. [DOI] [PMC free article] [PubMed] [Google Scholar]
  21. Tan G., Wan S., Mei S.-C., Gong B., Qian C., Chen J.-J. Boosted brackish water desalination and water softening by facilely designed MnO2/hierarchical porous carbon as capacitive deionization electrode. Water Res. X. 2023;19 doi: 10.1016/j.wroa.2023.100182. [DOI] [PMC free article] [PubMed] [Google Scholar]
  22. Uppinakudru A.P., Martín-Sómer M., Reynolds K., Stanley S., Bautista L.F., Pablos C., Marugán J. Wavelength synergistic effects in continuous flow-through water disinfection systems. Water Res. X. 2023;21 doi: 10.1016/j.wroa.2023.100208. [DOI] [PMC free article] [PubMed] [Google Scholar]
  23. Vo P.H.N., Key T.A., Le T.H., McDonough J.T., Porman S., Fiorenza S., Nguyen H.T.M., Dao V.T.N., Mueller J.F., Thai P.K. Evaluation of sealants to mitigate the release of per- and polyfluoroalkyl substances (PFAS) from AFFF-impacted concrete: characterization and forecasting. Water Res. X. 2023;20 doi: 10.1016/j.wroa.2023.100195. [DOI] [PMC free article] [PubMed] [Google Scholar]
  24. Wang C., Shen X., Fan B., Huang W., Huang C., Bai L., Jiang H. Phosphorus migration from sediment to phosphorus-inactivating material: a key process neglected by common phosphorus immobilization assessments for lake geoengineering. Water Res. X. 2023;21 doi: 10.1016/j.wroa.2023.100197. [DOI] [PMC free article] [PubMed] [Google Scholar]
  25. Wen H.-Q., Li Y.-S., Tian T., Yu H.-Q. The neglected ammonia leaching calcium in anaerobic granular sludge. Water Res. X. 2023;21 doi: 10.1016/j.wroa.2023.100200. [DOI] [PMC free article] [PubMed] [Google Scholar]
  26. Yalin D., Craddock H.A., Assouline S., Ben Mordechay E., Ben-Gal A., Bernstein N., Chaudhry R.M., Chefetz B., Fatta-Kassinos D., Gawlik B.M., Hamilton K.A., Khalifa L., Kisekka I., Klapp I., Korach-Rechtman H., Kurtzman D., Levy G.J., Maffettone R., Malato S., Manaia C.M., Manoli K., Moshe O.F., Rimelman A., Rizzo L., Sedlak D.L., Shnit-Orland M., Shtull-Trauring E., Tarchitzky J., Welch-White V., Williams C., McLain J., Cytryn E. Mitigating risks and maximizing sustainability of treated wastewater reuse for irrigation. Water Res. X. 2023;21 doi: 10.1016/j.wroa.2023.100203. [DOI] [PMC free article] [PubMed] [Google Scholar]
  27. Yan B., Liu J. Molecular framework for designing Fluoroclay with enhanced affinity for per- and polyfluoroalkyl substances. Water Res. X. 2023;19 doi: 10.1016/j.wroa.2023.100175. [DOI] [PMC free article] [PubMed] [Google Scholar]
  28. Yin S., Jiang X., Wang Y., Yang Y., Chen D., Shen J. Defense mechanism of Fe(III)-assisted anammox under salt stress: performance and microbial community dynamics. Water Res. X. 2023;20 doi: 10.1016/j.wroa.2023.100188. [DOI] [PMC free article] [PubMed] [Google Scholar]
  29. Yuan Z., Morgenroth E. Water Research X is becoming an independent, open access, top-quality journal in water science and technology. Water Res. X. 2023;18 doi: 10.1016/j.wroa.2022.100163. [DOI] [PMC free article] [PubMed] [Google Scholar]
  30. Zhang Y., Gong H., Zhu D., Lu D., Zhou S., Wang Y., Dai X. A two-stage partial nitritation-denitritation/anammox (PN-DN/A) process to treat high-solid anaerobic digestion (HSAD) reject water: verification based on pilot-scale and full-scale projects. Water Res. X. 2024;22 doi: 10.1016/j.wroa.2024.100213. [DOI] [PMC free article] [PubMed] [Google Scholar]
  31. Zheng M., Li H., Duan H., Liu T., Wang Z., Zhao J., Hu Z., Watts S., Meng J., Liu P., Rattier M., Larsen E., Guo J., Dwyer J., Akker B.V.D., Lloyd J., Hu S., Yuan Z. One-year stable pilot-scale operation demonstrates high flexibility of mainstream anammox application. Water Res. X. 2023;19 doi: 10.1016/j.wroa.2023.100166. [DOI] [PMC free article] [PubMed] [Google Scholar]
  32. Zhong K.-Q., Xie D.-H., Liu Y.-J., Guo P.-C., Sheng G.-P. Modulation of ultrathin nanosheet structure and nitrogen defects in graphitic carbon nitride for efficient photocatalytic bacterial inactivation. Water Res. X. 2023;20 doi: 10.1016/j.wroa.2023.100193. [DOI] [PMC free article] [PubMed] [Google Scholar]
  33. Zhou Y., Li X., Wu R., Guo L., Yin H. A smart sewer detection approach based on wavelet denoising of in-sewer temperature sensing measurement. Water Res. X. 2023;21 doi: 10.1016/j.wroa.2023.100205. [DOI] [PMC free article] [PubMed] [Google Scholar]

Associated Data

This section collects any data citations, data availability statements, or supplementary materials included in this article.

Data Availability Statement

  • No data was used for the research described in the article

Articles from Water Research X are provided here courtesy of Elsevier

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