ACS ES&T water最新文献_第6页

Inoculation Improves Microbial Manganese Removal during the Start-Up of Rapid Sand Filters. 接种提高快速砂滤池启动时微生物除锰效果。

IF 4.8

ACS ES&T water Pub Date : 2025-04-15 eCollection Date: 2025-05-09 DOI: 10.1021/acsestwater.5c00050

Signe Haukelidsaeter, Alje S Boersma, Thilo Behrends, Wytze K Lenstra, Niels A G M van Helmond, Lina Piso, Frank Schoonenberg, Paul W J J van der Wielen, Maartje A H J van Kessel, Sebastian Lücker, Caroline P Slomp

{"title":"Inoculation Improves Microbial Manganese Removal during the Start-Up of Rapid Sand Filters.","authors":"Signe Haukelidsaeter, Alje S Boersma, Thilo Behrends, Wytze K Lenstra, Niels A G M van Helmond, Lina Piso, Frank Schoonenberg, Paul W J J van der Wielen, Maartje A H J van Kessel, Sebastian Lücker, Caroline P Slomp","doi":"10.1021/acsestwater.5c00050","DOIUrl":"https://doi.org/10.1021/acsestwater.5c00050","url":null,"abstract":"Long start-up times to achieve manganese removal in rapid sand filters can pose challenges for drinking water companies. This study assessed the start-up dynamics of manganese removal in two full-scale dual-media rapid sand filters treating groundwater containing iron, ammonium, and manganese. After inoculation with 20% biologically active coated sand, ammonium and manganese removal efficiencies of ∼60-70% and ∼30-50% were achieved, respectively. Complete removal of ammonium occurred after ∼8 weeks, but ∼17 and ∼25 weeks were required for manganese removal in the two filters. Full manganese removal, accompanied by manganese oxide formation on new grains, was achieved when ∼50% of the ammonium was removed within the anthracite layer. X-ray spectroscopy of manganese oxides in the mineral coatings indicated a dominance of biologically produced manganese oxide with a structure similar to that of δ-MnO2, suggesting continuous microbial manganese oxidation in inoculated rapid sand filters. Concomitant changes in 16S rRNA gene profiles combined with qPCR and solute profiles suggest a key role for Nitrospira in both nitrification and manganese oxidation. We show that inoculation with biologically active filter medium enhances the efficiency of ammonium and manganese removal during filter start-up, offering a promising improvement strategy for rapid sand filters.","PeriodicalId":93847,"journal":{"name":"ACS ES&T water","volume":"5 5","pages":"2479-2489"},"PeriodicalIF":4.8,"publicationDate":"2025-04-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC12070406/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144082714","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Effect of Sulfide on the Cotransport of Ferrihydrite and Birnessite Colloids with Phosphorus in Saturated Porous Media 硫化物对饱和多孔介质中水合铁和硼镁矿胶体与磷共输的影响

IF 4.8

ACS ES&T water Pub Date : 2025-04-14 DOI: 10.1021/acsestwater.5c0014410.1021/acsestwater.5c00144

Shuxin Huang, Caixiang Zhang*, Lu Chen, Ruihan Xiong, Jidao Xie, Zenghui Fan and Jiasen Li,

{"title":"Effect of Sulfide on the Cotransport of Ferrihydrite and Birnessite Colloids with Phosphorus in Saturated Porous Media","authors":"Shuxin Huang, Caixiang Zhang*, Lu Chen, Ruihan Xiong, Jidao Xie, Zenghui Fan and Jiasen Li, ","doi":"10.1021/acsestwater.5c0014410.1021/acsestwater.5c00144","DOIUrl":"https://doi.org/10.1021/acsestwater.5c00144https://doi.org/10.1021/acsestwater.5c00144","url":null,"abstract":"In this work, ferrihydrite (Fhc) and birnessite colloids (Brc) were selected to explore their cotransport behavior along with phosphorus (P) in the sulfidic environments using column experiments. Multiple models and characterization methods were used to reveal the sulfidation mechanisms of Fhc and Brc and the effect on the transport of P. The results showed that the cotransport of Fhc and Brc along with P was significantly inhibited by the presence of sulfide. The breakthrough of Fhc and Brc decreased with increasing sulfide concentration, which was primarily attributed to the reductive dissolution of colloids and the reduction of surface charges. Meanwhile, the interaction between P and Fhc or Brc through the inner-sphere surface complexes (Fe–O–P or Mn–O–P) and surface ion exchange (O–P) was broken by the presence of sulfide. Consequently, the transport of P would be blocked by the formation of sulfidation products (such as S0, FeS, or MnS). Due to the presence of transition-state Mn(III), the reduction of Brc by sulfide was more sensitive than that of Fhc, thereby causing differences in the cotransport capacity. The findings expand the basic understanding of the fate and cotransport of iron and manganese colloids with contaminants in the subsurface environment.","PeriodicalId":93847,"journal":{"name":"ACS ES&T water","volume":"5 5","pages":"2581–2590 2581–2590"},"PeriodicalIF":4.8,"publicationDate":"2025-04-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143921270","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Evaluating Orthophosphate-Silicate Blend as an Alternative to Blended Phosphates for Corrosion Control and Sequestration 评价正磷酸盐-硅酸盐共混物作为混合磷酸盐控制和封存腐蚀的替代品

IF 4.8

ACS ES&T water Pub Date : 2025-04-14 DOI: 10.1021/acsestwater.5c0015910.1021/acsestwater.5c00159

Kalli M. Hood, Benjamin F. Trueman and Graham A. Gagnon*,

{"title":"Evaluating Orthophosphate-Silicate Blend as an Alternative to Blended Phosphates for Corrosion Control and Sequestration","authors":"Kalli M. Hood, Benjamin F. Trueman and Graham A. Gagnon*, ","doi":"10.1021/acsestwater.5c0015910.1021/acsestwater.5c00159","DOIUrl":"https://doi.org/10.1021/acsestwater.5c00159https://doi.org/10.1021/acsestwater.5c00159","url":null,"abstract":"The presence of iron and manganese in drinking water distribution systems can contribute to discoloration, taste and odor issues, scale buildup, deposition corrosion, and the adsorption and transport of lead. Sequestrants can minimize aesthetic concerns and scale buildup, but they are risky due to increased lead/copper solubility. Here, we used a bench-scale batch reactor to evaluate orthophosphate with sodium silicate or polyphosphate for simultaneous lead corrosion control in waters with and without iron/manganese. Consistent with previous work, ortho-trimetaphosphate increased the total lead (23%). Increased dissolved lead was also observed for both ortho-trimetaphosphate (50%) and ortho-silicate (30%) treatments. When iron/manganese was present, orthophosphate-silicate was associated with 5–12% less total lead relative to orthophosphate under the same conditions, and the effect of ortho-trimetaphosphate was pH dependent. The addition of silicate and trimetaphosphate also reduced water discoloration compared to orthophosphate, as measured by apparent color. Here, the orthophosphate-silicate blend did not significantly increase total lead in the absence of high iron and manganese but increases to the highly mobile, dissolved fraction should be noted. Utilities seeking to control lead for compliance purposes, while simultaneously managing iron and manganese for consumer confidence, should explore orthophosphate-silicate as a possible solution in their corrosion control assessments.Silicate blended with orthophosphate can mitigate the lead increase and aesthetic concerns caused by iron and manganese.","PeriodicalId":93847,"journal":{"name":"ACS ES&T water","volume":"5 5","pages":"2630–2636 2630–2636"},"PeriodicalIF":4.8,"publicationDate":"2025-04-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://pubs.acs.org/doi/epdf/10.1021/acsestwater.5c00159","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143921336","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Breaking the Technical Barrier for High Spatial Resolution Monitoring: A Novel Approach to Multi-Level Groundwater Monitoring System Development 突破高空间分辨率监测的技术障碍：多层次地下水监测系统开发的新途径

IF 4.8

ACS ES&T water Pub Date : 2025-04-14 DOI: 10.1021/acsestwater.4c0122710.1021/acsestwater.4c01227

Wenzhao Liang, Jiu Jimmy Jiao*, Yi Liu, Shengchao Yu, Kin Bong Eddie Ho, Xin Luo and John A. Cherry,

{"title":"Breaking the Technical Barrier for High Spatial Resolution Monitoring: A Novel Approach to Multi-Level Groundwater Monitoring System Development","authors":"Wenzhao Liang, Jiu Jimmy Jiao*, Yi Liu, Shengchao Yu, Kin Bong Eddie Ho, Xin Luo and John A. Cherry, ","doi":"10.1021/acsestwater.4c0122710.1021/acsestwater.4c01227","DOIUrl":"https://doi.org/10.1021/acsestwater.4c01227https://doi.org/10.1021/acsestwater.4c01227","url":null,"abstract":"Multilevel systems (MLS) enable comprehensive monitoring of groundwater distribution and contamination by observing multiple geologic layers in a single borehole, thereby reducing costs and investigation waste. However, the limited adoption of MLS is due to complex design, lack of flexibility, and accessory incompatibility. This study introduces the HKU Multi-Level Groundwater Monitoring System, or HKU System for short, which provides a flexible and cost-effective approach to constructing MLS. The system comprises PVC pipes and key components (e.g., ports, connectors, and holders) that can be produced through 3D printing. The PVC pipes, constituting over 80% of the system’s materials, are readily accessible from local plumbing suppliers, making it the most cost-effective MLS worldwide. A 5-channel HKU System (⌀60 mm) was showcased to explain the system’s structure and functions, but the specific number of channels and sizes are flexible and can be tailor-made to meet different observation needs. Both groundwater sampling and water level monitoring functions were thoroughly examined in the system installed in a river delta with multilayered aquifers and aquitards in the Pearl River Delta, China. The physiochemical properties of the sampled groundwater were consistent with historical records, ensuring sampling robustness. Finally, an advanced HKU System integrating a universal seal is proposed to further simplify MLS development.The HKU System has the potential to enhance the acceptance of MLS in groundwater monitoring, leading to more effective water resource management. This advancement can aid in meeting the growing need to protect groundwater resources and predict contamination risks more efficiently.","PeriodicalId":93847,"journal":{"name":"ACS ES&T water","volume":"5 5","pages":"2343–2351 2343–2351"},"PeriodicalIF":4.8,"publicationDate":"2025-04-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://pubs.acs.org/doi/epdf/10.1021/acsestwater.4c01227","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143921274","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Enhanced Nitrogen and Phosphorus Removal from Alkaline Fermentation Broth by a Novel Modified Zeolite: Mechanisms Revealed by Molecular Dynamic Simulation 一种新型改性沸石增强碱性发酵液中氮磷的去除：分子动力学模拟机制揭示

IF 4.8

ACS ES&T water Pub Date : 2025-04-11 DOI: 10.1021/acsestwater.4c0103410.1021/acsestwater.4c01034

Guorun Zhou, Yuan Tian, Yaoyao Gao, Zhou An, Xiao Huang*, Zhuangzhuang Xiang and Jianfeng Zhou*,

{"title":"Enhanced Nitrogen and Phosphorus Removal from Alkaline Fermentation Broth by a Novel Modified Zeolite: Mechanisms Revealed by Molecular Dynamic Simulation","authors":"Guorun Zhou, Yuan Tian, Yaoyao Gao, Zhou An, Xiao Huang*, Zhuangzhuang Xiang and Jianfeng Zhou*, ","doi":"10.1021/acsestwater.4c0103410.1021/acsestwater.4c01034","DOIUrl":"https://doi.org/10.1021/acsestwater.4c01034https://doi.org/10.1021/acsestwater.4c01034","url":null,"abstract":"Nitrogen (N) and phosphorus (P) release during the sludge alkaline fermentation process poses a significant challenge for wastewater treatment, as it limits the effective use of fermentation broth as a carbon source. This study explored the use of hydrochloric acid (HCl)-modified zeolite to enhance the removal of N and P from alkaline sludge fermentation broth. The optimized conditions for HCl modification were determined to be 2.0 mol/L HCl and a zeolite dosage of 100 g/L. The modification resulted in a pore size increase, leading to enhanced adsorption capacities of 90.83% for NH4+–N and 28.52% for PO43––P. Additionally, the modified zeolite reduced the loss of volatile fatty acids (VFAs), retaining over 98 mg COD/L, which was crucial for maintaining the carbon source for further biological treatments. Adsorption kinetics followed a pseudo-second-order model, indicating chemisorption as the primary mechanism. Molecular dynamics simulations revealed that the adsorption process of the modified zeolite was more stable, with stronger hydrogen bonding for NH4+–N and better retention of PO43––P compared with natural zeolite. This study demonstrated the potential of HCl-modified zeolite as an effective adsorbent for improving N and P removal while preserving valuable VFAs in wastewater treatment processes.","PeriodicalId":93847,"journal":{"name":"ACS ES&T water","volume":"5 5","pages":"2200–2211 2200–2211"},"PeriodicalIF":4.8,"publicationDate":"2025-04-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143921259","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Photodegradation of Nitrogenous Disinfection Byproducts by Far-UVC Light at 222 nm. 222 nm远紫外线光降解含氮消毒副产物的研究。

IF 4.8

ACS ES&T water Pub Date : 2025-04-10 eCollection Date: 2025-05-09 DOI: 10.1021/acsestwater.5c00156

Juhee Kim, Xiaoyue Xin, Ryan J Kann, Jiaqi Li, Aidan S Labrozzi, Jiale Xu, Ching-Hua Huang

{"title":"Photodegradation of Nitrogenous Disinfection Byproducts by Far-UVC Light at 222 nm.","authors":"Juhee Kim, Xiaoyue Xin, Ryan J Kann, Jiaqi Li, Aidan S Labrozzi, Jiale Xu, Ching-Hua Huang","doi":"10.1021/acsestwater.5c00156","DOIUrl":"https://doi.org/10.1021/acsestwater.5c00156","url":null,"abstract":"Krypton chloride (KrCl*) excimer lamps emitting far-UVC 222 nm light have emerged as a promising alternative technology to conventional low-pressure UV (LPUV) lamps emitting at 254 nm. Herein, the suitability of 222 nm for the photodegradation of 12 haloacetonitrile and haloacetamide disinfection byproducts (DBPs) was investigated. Photolysis of all these nitrogenous DBPs is significantly enhanced at 222 nm, compared to 254 nm. The photolysis rate constants (k 222 nm = 7.96 × 103 - 1.60 × 106 cm2·Einstein-1) and quantum yields (Φ222 nm = 0.049-14.43) are 3-56 and 1.2-4.5 times greater, respectively. The photolysis rate of haloacetamides is faster than that of haloacetonitriles and increases with the number of halogens on DBPs. Bromo-DBPs feature much faster photodegradation than chloro-DBPs within the same structural class. The photolysis rates at 222 nm strongly correlate with DBP molar absorption coefficients (ε) and the energy gap between the highest occupied and the lowest unoccupied orbitals (E HOMO - E LUMO), indicating the importance of light absorption and photoexcitation. Nitrate and natural organic matter in water cast considerable light-screening effects but also generate reactive species that play a role in the degradation of DBPs at 222 nm. These findings are useful for further developing far-UVC-based technology to mitigate water contamination.","PeriodicalId":93847,"journal":{"name":"ACS ES&T water","volume":"5 5","pages":"2619-2629"},"PeriodicalIF":4.8,"publicationDate":"2025-04-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC12070416/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144082722","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Discovery of Novel Hydroxyproline-Containing Microcystins in Western Lake Erie Cyanobacterial Bloom Samples 伊利湖西部蓝藻华样品中新型含羟脯氨酸微囊藻毒素的发现

IF 4.8

ACS ES&T water Pub Date : 2025-04-10 DOI: 10.1021/acsestwater.4c0124110.1021/acsestwater.4c01241

Sanduni H. Premathilaka, Judy A. Westrick and Dragan Isailovic*,

{"title":"Discovery of Novel Hydroxyproline-Containing Microcystins in Western Lake Erie Cyanobacterial Bloom Samples","authors":"Sanduni H. Premathilaka, Judy A. Westrick and Dragan Isailovic*, ","doi":"10.1021/acsestwater.4c0124110.1021/acsestwater.4c01241","DOIUrl":"https://doi.org/10.1021/acsestwater.4c01241https://doi.org/10.1021/acsestwater.4c01241","url":null,"abstract":"From midsummer to fall, cyanobacterial harmful algal blooms (cHABs) producing microcystins (MCs), a class of hepatotoxic cyclic heptapeptides, plague Lake Erie’s western basin. Since MC congener toxicities vary over 2 orders of magnitude, identification and characterization of the microcystin congener profile can be crucial information when balancing between public health and local economic resilience. Herein, five hydroxyproline (Hyp)-containing MCs were discovered in a Lake Erie cHAB. High-resolution liquid chromatography electrospray ionization mass spectrometry (LC-ESI-MS), tandem mass spectrometry (MS/MS), and thiol derivatization were used in the putative identification of novel MC congeners. Among the five novel congeners, MC-LHyp, MC-HpeHyp, [Dhb7]MC-HilHyp, and [Dhb7]MC-YHyp contained single Hyp at position 4 of the cyclic structure, while MC-HypHyp contained two Hyp residues at positions 2 and 4 of the cyclic structure. The hydroxyproline amino acid imparts a more rigid peptide backbone because it forms a ring by bonding back to the amino group. Hence, the toxicities of Hyp-containing MCs and their isomers need to be elucidated. Furthermore, the discovery of hydroxyproline-containing MCs stresses the importance of understanding the genetic and environmental mechanisms of MC biosynthesis.","PeriodicalId":93847,"journal":{"name":"ACS ES&T water","volume":"5 5","pages":"2352–2360 2352–2360"},"PeriodicalIF":4.8,"publicationDate":"2025-04-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143921222","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Seasonal Stratification Drives Bioaccumulation of Pelagic Mercury Sources in Eutrophic Lakes. 季节性分层驱动富营养化湖泊中上层汞源的生物积累。

IF 4.8

ACS ES&T water Pub Date : 2025-04-10 eCollection Date: 2025-05-09 DOI: 10.1021/acsestwater.5c00028

Grace J Armstrong, Sarah E Janssen, Ryan F Lepak, Tylor J Rosera, Benjamin D Peterson, Samia T Cushing, Michael T Tate, James P Hurley

{"title":"Seasonal Stratification Drives Bioaccumulation of Pelagic Mercury Sources in Eutrophic Lakes.","authors":"Grace J Armstrong, Sarah E Janssen, Ryan F Lepak, Tylor J Rosera, Benjamin D Peterson, Samia T Cushing, Michael T Tate, James P Hurley","doi":"10.1021/acsestwater.5c00028","DOIUrl":"https://doi.org/10.1021/acsestwater.5c00028","url":null,"abstract":"Increased lake eutrophication, influenced by changing climate and land use, alters aquatic cycling and bioaccumulation of mercury (Hg). Additionally, seasonally dynamic lake circulation and plankton community composition can confound our ability to predict changes in biological Hg concentrations and sources. To assess temporal variation, we examined seasonal total Hg (THg) and methylmercury (MeHg) concentrations and stable isotope values in seston, waters, sediments, and fish from two adjacent urban eutrophic lakes in Madison, Wisconsin. In Lake Monona, surface sediment THg concentrations were elevated due to comparably higher urbanization and historical industrial inputs, whereas Lake Mendota sediments had lower concentrations corresponding with largely agricultural and suburban surrounding watershed. Surface water THg and MeHg were similar between lakes and seasonally dynamic, but water profiles exhibited elevated concentrations in the meta- and hypolimnia, highlighting water column MeHg production. Seston MeHg concentrations were often highest at shoulder seasons, possibly owing to metalimnetic MeHg delivery, but also differences in biomass and water clarity. The Δ199Hg and δ202Hg values in seston were similar between lakes, despite differing sediment THg concentrations and isotope values, suggesting a shared bioaccumulated source of MeHg. Measurement of MeHg stable isotopes further elucidated that seston and fish predominantly bioaccumulated pelagic-sourced MeHg.","PeriodicalId":93847,"journal":{"name":"ACS ES&T water","volume":"5 5","pages":"2444-2454"},"PeriodicalIF":4.8,"publicationDate":"2025-04-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC12070409/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144082726","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Photodegradation of Nitrogenous Disinfection Byproducts by Far-UVC Light at 222 nm 222 nm远紫外线光降解含氮消毒副产物的研究

IF 4.8

ACS ES&T water Pub Date : 2025-04-10 DOI: 10.1021/acsestwater.5c0015610.1021/acsestwater.5c00156

Juhee Kim*, Xiaoyue Xin, Ryan J. Kann, Jiaqi Li, Aidan S. Labrozzi, Jiale Xu and Ching-Hua Huang*,

{"title":"Photodegradation of Nitrogenous Disinfection Byproducts by Far-UVC Light at 222 nm","authors":"Juhee Kim*, Xiaoyue Xin, Ryan J. Kann, Jiaqi Li, Aidan S. Labrozzi, Jiale Xu and Ching-Hua Huang*, ","doi":"10.1021/acsestwater.5c0015610.1021/acsestwater.5c00156","DOIUrl":"https://doi.org/10.1021/acsestwater.5c00156https://doi.org/10.1021/acsestwater.5c00156","url":null,"abstract":"Krypton chloride (KrCl*) excimer lamps emitting far-UVC 222 nm light have emerged as a promising alternative technology to conventional low-pressure UV (LPUV) lamps emitting at 254 nm. Herein, the suitability of 222 nm for the photodegradation of 12 haloacetonitrile and haloacetamide disinfection byproducts (DBPs) was investigated. Photolysis of all these nitrogenous DBPs is significantly enhanced at 222 nm, compared to 254 nm. The photolysis rate constants (k222 nm = 7.96 × 103 – 1.60 × 106 cm2·Einstein–1) and quantum yields (Φ222 nm = 0.049–14.43) are 3–56 and 1.2–4.5 times greater, respectively. The photolysis rate of haloacetamides is faster than that of haloacetonitriles and increases with the number of halogens on DBPs. Bromo-DBPs feature much faster photodegradation than chloro-DBPs within the same structural class. The photolysis rates at 222 nm strongly correlate with DBP molar absorption coefficients (ε) and the energy gap between the highest occupied and the lowest unoccupied orbitals (EHOMO – ELUMO), indicating the importance of light absorption and photoexcitation. Nitrate and natural organic matter in water cast considerable light-screening effects but also generate reactive species that play a role in the degradation of DBPs at 222 nm. These findings are useful for further developing far-UVC-based technology to mitigate water contamination.The KrCl* excimer lamp emitting at 222 nm is a promising UV technology to enhance the photodegradation of nitrogenous DBPs, which is highly influenced by the molar absorptivity and electronic properties of DBPs.","PeriodicalId":93847,"journal":{"name":"ACS ES&T water","volume":"5 5","pages":"2619–2629 2619–2629"},"PeriodicalIF":4.8,"publicationDate":"2025-04-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://pubs.acs.org/doi/epdf/10.1021/acsestwater.5c00156","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143921224","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Seasonal Stratification Drives Bioaccumulation of Pelagic Mercury Sources in Eutrophic Lakes 季节性分层驱动富营养化湖泊中上层汞源的生物积累

IF 4.8

ACS ES&T water Pub Date : 2025-04-10 DOI: 10.1021/acsestwater.5c0002810.1021/acsestwater.5c00028

Grace J. Armstrong*, Sarah E. Janssen, Ryan F. Lepak, Tylor J. Rosera, Benjamin D. Peterson, Samia T. Cushing, Michael T. Tate and James P. Hurley,

{"title":"Seasonal Stratification Drives Bioaccumulation of Pelagic Mercury Sources in Eutrophic Lakes","authors":"Grace J. Armstrong*, Sarah E. Janssen, Ryan F. Lepak, Tylor J. Rosera, Benjamin D. Peterson, Samia T. Cushing, Michael T. Tate and James P. Hurley, ","doi":"10.1021/acsestwater.5c0002810.1021/acsestwater.5c00028","DOIUrl":"https://doi.org/10.1021/acsestwater.5c00028https://doi.org/10.1021/acsestwater.5c00028","url":null,"abstract":"Increased lake eutrophication, influenced by changing climate and land use, alters aquatic cycling and bioaccumulation of mercury (Hg). Additionally, seasonally dynamic lake circulation and plankton community composition can confound our ability to predict changes in biological Hg concentrations and sources. To assess temporal variation, we examined seasonal total Hg (THg) and methylmercury (MeHg) concentrations and stable isotope values in seston, waters, sediments, and fish from two adjacent urban eutrophic lakes in Madison, Wisconsin. In Lake Monona, surface sediment THg concentrations were elevated due to comparably higher urbanization and historical industrial inputs, whereas Lake Mendota sediments had lower concentrations corresponding with largely agricultural and suburban surrounding watershed. Surface water THg and MeHg were similar between lakes and seasonally dynamic, but water profiles exhibited elevated concentrations in the meta- and hypolimnia, highlighting water column MeHg production. Seston MeHg concentrations were often highest at shoulder seasons, possibly owing to metalimnetic MeHg delivery, but also differences in biomass and water clarity. The Δ199Hg and δ202Hg values in seston were similar between lakes, despite differing sediment THg concentrations and isotope values, suggesting a shared bioaccumulated source of MeHg. Measurement of MeHg stable isotopes further elucidated that seston and fish predominantly bioaccumulated pelagic-sourced MeHg.Mercury species concentrations and stable isotope values reveal that eutrophic lakes display unique seasonally dynamic Hg cycling within the water column and food web.","PeriodicalId":93847,"journal":{"name":"ACS ES&T water","volume":"5 5","pages":"2444–2454 2444–2454"},"PeriodicalIF":4.8,"publicationDate":"2025-04-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://pubs.acs.org/doi/epdf/10.1021/acsestwater.5c00028","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143921225","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0