AWWA water science最新文献_第8页

Evaluation of sequential dosing of potassium permanganate for microcystin-LR removal 高锰酸钾序贯给药去除微囊藻毒素LR的评价

AWWA water science Pub Date : 2023-04-26 DOI: 10.1002/aws2.1338

Maycee Hurd, Allison A. MacKay, Juliana R. Laszakovits

引用次数: 0

Management of point-of-use and point-of-entry for regulatory compliance: Survey of state administrators 管理法规遵从性的使用点和进入点：对州行政人员的调查

AWWA water science Pub Date : 2023-04-26 DOI: 10.1002/aws2.1335

Katherine Alfredo, Madelyn Wilson, Alan Roberson

{"title":"Management of point-of-use and point-of-entry for regulatory compliance: Survey of state administrators","authors":"Katherine Alfredo, Madelyn Wilson, Alan Roberson","doi":"10.1002/aws2.1335","DOIUrl":"https://doi.org/10.1002/aws2.1335","url":null,"abstract":"The USEPA (United States Environmental Protection Agency) Lead and Copper Rule Revisions allow the use of distributed treatment approaches such as point‐of‐use (POU) and point‐of‐entry (POE) treatment for systems with 10,000 connections or less as a compliance strategy. However, this poses an opportunity for the USEPA to reevaluate system size recommendations for distributed treatment. The current research uses online surveys and semi‐structured interviews (SSIs) to highlight the general sentiment of state regulators managing POU/POE devices and inquiries. Analysis of the 43 survey responses and 13 SSIs revealed that most state regulators described systems of approximately 30–50 connections as the most successful. Resident cooperation, operation and maintenance, monitoring, and the actual implementation of distributed treatment approaches were repeatedly listed as the greatest concerns. As the use of distributed treatment continues to expand, the water sector must devote research efforts to quantitatively determining the drivers of success as well as highlighting clear indicators of potential failure.","PeriodicalId":101301,"journal":{"name":"AWWA water science","volume":"5 2","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-04-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/aws2.1335","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"50144429","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: 1

Multi-objective optimization models for the renewal planning of multiple asset classes 多资产类别更新规划的多目标优化模型

AWWA water science Pub Date : 2023-04-25 DOI: 10.1002/aws2.1336

Thomas Ying-Jeh Chen, Eric Wang, Nicole Pasch, Amin Ganjidoost

{"title":"Multi-objective optimization models for the renewal planning of multiple asset classes","authors":"Thomas Ying-Jeh Chen, Eric Wang, Nicole Pasch, Amin Ganjidoost","doi":"10.1002/aws2.1336","DOIUrl":"https://doi.org/10.1002/aws2.1336","url":null,"abstract":"<div>\u0000 \u0000 \u0000 <section>\u0000 \u0000 <p>Managing the aging infrastructure of water distribution systems presents a challenge for many utilities. With various asset types competing for limited dollars, designing an effective asset management program is a resource allocation problem. Mobilization of equipment and crew is a significant cost (typically 2%–10%) within any capital improvement program. Therefore, selecting projects that target multiple asset classes together can reduce mobilization and help utilities stretch their budgets further. This research presents a process for modeling the joint renewal planning of multiple asset classes. The problem is framed as a dual-objective optimization, where the selection of project areas aims to maximize lead service line removal and water meter changeout together. A case study from a Midwest utility is presented, and empirical data suggests the dual-objective approach effectively reduces duplicate interventions in the same regions. Equity considerations are also examined, where constraints are added to enforce system-wide project selection. Results show that the sensitivity of the objective toward equity is dependent on the underlying spatial distribution of the target asset itself, where uneven spread of the target asset leads to greater negative impact on model performance.</p>\u0000 </section>\u0000 </div>","PeriodicalId":101301,"journal":{"name":"AWWA water science","volume":"5 2","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-04-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/aws2.1336","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"50143441","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

The importance of uranium isotope composition for gross alpha activity regulation 铀同位素组成对总α活性调节的重要性

AWWA water science Pub Date : 2023-04-19 DOI: 10.1002/aws2.1329

Sean R. Scott, Amy K. Wiersma, Gary Krinke

引用次数: 0

Understanding questions and concerns about potable water reuse: An analysis of survey write-in responses 理解关于饮用水再利用的问题和担忧：对调查书面回复的分析

AWWA water science Pub Date : 2023-04-18 DOI: 10.1002/aws2.1333

Caroline E. Scruggs, Catherine M. Heyne, Kellin N. Rumsey

引用次数: 1

Acclimation, manganese removal, and backwash impact on full-scale drinking water biofilter microbiome 驯化、除锰和反冲洗对全尺寸饮用水生物过滤器微生物组的影响

AWWA water science Pub Date : 2023-04-18 DOI: 10.1002/aws2.1334

William R. Morales Medina, Priscilla To, Malcolm Taylor, Caroline Nguyen, Nicole L. Fahrenfeld

{"title":"Acclimation, manganese removal, and backwash impact on full-scale drinking water biofilter microbiome","authors":"William R. Morales Medina, Priscilla To, Malcolm Taylor, Caroline Nguyen, Nicole L. Fahrenfeld","doi":"10.1002/aws2.1334","DOIUrl":"https://doi.org/10.1002/aws2.1334","url":null,"abstract":"<p>Biofiltration for drinking water treatment has several water quality benefits but questions remain about biofilter start-up in temperate climates where temperature and water quality changes can impact performance. A year-long full-scale demonstration was performed with biofilters operated in parallel to chlorinated filters to (O1) monitor the development of the biofilter microbiota across the acclimation period with respect to removal of Mn and total organic carbon, and (O2) determine the impact of depth and backwash events on the microbial community composition and function. Biofilter media biomass increased for the first 6 months of operation and after about 9 months the biofilters achieved comparable Mn removal to the chlorinated filters. Prokaryotic diversity decreased when the water temperature dropped. Backwash resulted in an increase in microbial diversity deeper in the biofilter. By the next sampling (30 h post backwash), 16S rRNA gene copies were again more abundant in the upper layers. Metagenomic sequencing confirmed the presence of <i>mox</i>A and <i>mof</i>A, Mn oxidizing genes. The results presented can help inform expected performance of full-scale biofilters in temperate climates.</p>","PeriodicalId":101301,"journal":{"name":"AWWA water science","volume":"5 2","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-04-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/aws2.1334","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"50151927","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

Assessment of cyanobacteria and their taste and odorous metabolites in the lower River Murray: 2000–2022 2000–2022年默里河下游蓝藻及其味觉和气味代谢产物的评估

AWWA water science Pub Date : 2023-04-03 DOI: 10.1002/aws2.1328

Florence Choo, Emma Sawade, David Cook

引用次数: 0

Patterns and impacts of cyanobacteria in a deep, thermally stratified, oligotrophic lake 深层、热分层、贫营养湖泊中蓝藻的模式和影响

AWWA water science Pub Date : 2023-03-29 DOI: 10.1002/aws2.1326

Anthony R. Prestigiacomo, Rebecca M. Gorney, James B. Hyde, Courtney Davis, Aimee Clinkhammer

{"title":"Patterns and impacts of cyanobacteria in a deep, thermally stratified, oligotrophic lake","authors":"Anthony R. Prestigiacomo, Rebecca M. Gorney, James B. Hyde, Courtney Davis, Aimee Clinkhammer","doi":"10.1002/aws2.1326","DOIUrl":"https://doi.org/10.1002/aws2.1326","url":null,"abstract":"<p>Cyanobacterial blooms are a concern in oligotrophic lakes because these systems are often used for multiple purposes (i.e., recreation and public water supplies). Monitoring cyanobacteria impacts is challenging in such cases because of low and heterogeneous concentrations over time, space, and depth. Canandaigua Lake (New York State) is oligotrophic, but has been impacted by blooms since at least the early 2000s, with limited quantification. This study integrated data from established shoreline surveillance and inter-agency monitoring programs to connect lake processes and evaluate use impacts. Surveys at open-water locations were conducted to investigate the origination, timing, and magnitude of cyanobacterial bloom development. Impacts on recreation and source water were caused by blooms originating in the epilimnion that moved to shorelines and intake depths. The integration of multiple monitoring programs was critical to understanding impacts. The methods developed here can be adopted to other cases of large, deep, low-nutrient lakes.</p>","PeriodicalId":101301,"journal":{"name":"AWWA water science","volume":"5 2","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-03-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/aws2.1326","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"50147392","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: 1

Summer odors to winter blooms: Treatment validation in the lower River Murray 夏季气味对冬季花朵的影响：默里河下游的处理验证

AWWA water science Pub Date : 2023-03-27 DOI: 10.1002/aws2.1330

Florence Choo, Emma Sawade, David Cook

引用次数: 0

Examining the efficacy of copper-silver ionization for management of Legionella: Recommendations for optimal use 检验铜银电离治疗军团菌的疗效：最佳使用建议

AWWA water science Pub Date : 2023-03-26 DOI: 10.1002/aws2.1327

Mark LeChevallier

引用次数: 1