Water Research X最新文献_第10页

Scattered and transmitted light as surrogates for activated carbon residual in advanced wastewater treatment processes: Investigating the influence of particle size 散射光和透射光作为先进废水处理工艺中活性炭残留量的替代物：研究颗粒大小的影响

IF 7.5 2区环境科学与生态学

Water Research X Pub Date : 2024-04-09 DOI: 10.1016/j.wroa.2024.100222

Franziska Kirchen , Thomas Fundneider , Louis Gimmel , Michael Thomann , Michael Pulfer , Susanne Lackner

{"title":"Scattered and transmitted light as surrogates for activated carbon residual in advanced wastewater treatment processes: Investigating the influence of particle size","authors":"Franziska Kirchen , Thomas Fundneider , Louis Gimmel , Michael Thomann , Michael Pulfer , Susanne Lackner","doi":"10.1016/j.wroa.2024.100222","DOIUrl":"https://doi.org/10.1016/j.wroa.2024.100222","url":null,"abstract":"<div><p>The use of powdered activated carbon (PAC) is a common process in advanced wastewater treatment to remove micropollutants. Retention and separation of PAC is essential as PAC loaded with micropollutants should not be released into the environment. Determining the activated carbon (AC) residual in the effluent poses a challenge, as there is currently no on-line measurement method. In this study, the correlation between turbidity, measured by scattered light, and absorption at wavelength of 550 nm (Absorption<sub>550 nm</sub>), measured by transmitted light, was investigated in relation to the AC residue. Linear correlations for turbidity (R<sup>2</sup> = 0.95) and Absorption<sub>550 nm</sub> (R<sup>2</sup> = 1.00) to AC concentrations were observed in both laboratory and full-scale experiments in a pilot plant where superfine PAC was added prior to Pile Cloth Media Filtration (PCMF). Decreasing the particle size (d<sub>50</sub>) while maintaining the same AC concentration leads to increased turbidity: Therefore, a fourfold reduction in d<sub>50</sub> results in a 2- to 3-fold increase in turbidity, whereas a 30-fold reduction in d<sub>50</sub> leads to a 6-to 8-fold increase. Furthermore, the original wastewater turbidity led to a parallel shift in the linear correlation between turbidity and AC. Coagulant doses of up to 400 mg Me<sup>3+</sup>/g AC resulted in a 50% reduction in turbidity. However, higher concentrations from 400 to 1,000 mg Me<sup>3+</sup>/g AC resulted in increased turbidity with only a 30% reduction compared to the initial turbidity. The study also highlights the significance of AC particle size in optical measurements, impacting result accuracy.</p></div>","PeriodicalId":52198,"journal":{"name":"Water Research X","volume":"23 ","pages":"Article 100222"},"PeriodicalIF":7.5,"publicationDate":"2024-04-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2589914724000124/pdfft?md5=84e3462cd360e8fd750e27ee841f3757&pid=1-s2.0-S2589914724000124-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140551633","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

SARS-CoV-2 wastewater surveillance in the Czech Republic: Spatial and temporal differences in SARS-CoV-2 RNA concentrations and relationship to clinical data and wastewater parameters 捷克共和国的 SARS-CoV-2 废水监测：SARS-CoV-2 RNA 浓度的时空差异以及与临床数据和废水参数的关系

IF 7.5 2区环境科学与生态学

Water Research X Pub Date : 2024-03-28 DOI: 10.1016/j.wroa.2024.100220

Kateřina Sovová , Petra Vašíčková , Vojtěch Valášek , David Výravský , Věra Očenášková , Eva Juranová , Milena Bušová , Milan Tuček , Vladimír Bencko , Hana Zvěřinová Mlejnková

{"title":"SARS-CoV-2 wastewater surveillance in the Czech Republic: Spatial and temporal differences in SARS-CoV-2 RNA concentrations and relationship to clinical data and wastewater parameters","authors":"Kateřina Sovová , Petra Vašíčková , Vojtěch Valášek , David Výravský , Věra Očenášková , Eva Juranová , Milena Bušová , Milan Tuček , Vladimír Bencko , Hana Zvěřinová Mlejnková","doi":"10.1016/j.wroa.2024.100220","DOIUrl":"10.1016/j.wroa.2024.100220","url":null,"abstract":"<div><p>This study presents the results of systematic wastewater monitoring of SARS-CoV-2 RNA and basic wastewater parameters from four different wastewater treatment plants (WWTPs) in the Czech Republic over the 2020–2022 epidemic. Two-step reverse-transcription quantitative PCR targeting genes encoding the N and Nsp12 proteins was employed to detect SARS-CoV-2 RNA loading in 420 wastewater samples. The results obtained were used to evaluate the potential of wastewater analysis for describing the epidemiological situation in cities of different sizes and determining temporal differences based on the prevailing SARS-CoV-2 variant. Strong correlations between the number of active and hospitalised COVID‐19 cases in each WWTP catchment area and the concentration of SARS-CoV-2 RNA detected in the wastewater clearly demonstrated the suitability of this wastewater-based epidemiological approach for WWTPs of different sizes and characteristics, despite differences in SARS-CoV-2 variant waves, with some WWTPs showing high predictive potential. This study demonstrated on the data from the Czech Republic that targeted systematic monitoring of wastewater provides sufficiently robust data for surveillance of viral loads in sample populations, and thus contributes to preventing the spread of infection and subsequent introduction of appropriate measures.</p></div>","PeriodicalId":52198,"journal":{"name":"Water Research X","volume":"23 ","pages":"Article 100220"},"PeriodicalIF":7.5,"publicationDate":"2024-03-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2589914724000100/pdfft?md5=fe260961c94e9cdda264278fe48888fc&pid=1-s2.0-S2589914724000100-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140400224","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

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 处理高固体厌氧消化（HSAD）废水的两阶段部分亚硝酸盐化-反硝酸盐化/氨氧化（PN-DN/A）工艺：基于中试规模和全面规模项目的验证

IF 7.5 2区环境科学与生态学

Water Research X Pub Date : 2024-01-01 DOI: 10.1016/j.wroa.2024.100213

Yanyan Zhang, Hui Gong, Danyang Zhu, Dandan Lu, Shuyan Zhou, Yayi Wang, Xiaohu Dai

{"title":"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","authors":"Yanyan Zhang, Hui Gong, Danyang Zhu, Dandan Lu, Shuyan Zhou, Yayi Wang, Xiaohu Dai","doi":"10.1016/j.wroa.2024.100213","DOIUrl":"https://doi.org/10.1016/j.wroa.2024.100213","url":null,"abstract":"<div><p>High-solid anaerobic digestion (HSAD) reject water, distinguished by elevated levels of chemical oxygen demand (COD), NH<sub>4</sub><sup>+</sup>-N and an imbalanced COD/TIN, presents a significant challenge for treatment through conventional partial nitritation/ anammox (PN/A) process. This study introduced a revised two-stage PN/A process, namely partial nitritation/denitritation-anammox (PN-DN/A) process. Its effectiveness was investigated through both pilot-scale (12 t/d) and full-scale (400 t/d) operations, showcasing stable operation with an impressive total removal rate of over 90 % for total inorganic nitrogen (TIN) and exceeding 60 % for COD. Notably, 30 % of TIN was eliminated through heterotrophic denitritation in partial nitritation-denitritation (PN-DN) stage, while approximately 55 % of TIN removal occurred in the anammox stage with anaerobic ammonium oxidizing bacteria (AnAOB) enrichment (<em>Candidatus</em> Kuenenia, 25.9 % and 26.6 % relative abundance for pilot and full scale). In the PN-DN stage, aerobic-anaerobic alternation promoted organics elimination (around 50 % COD) and balanced nitrogen species. Microbial and metagenomic analysis verified the coupling between autotrophic and heterotrophic denitritation and demonstrated that PN-DN stage acted as a protective buffer for anammox stage. This comprehensive study highlights the PN-DN/A process's efficacy in stably treating HSAD reject water.</p></div>","PeriodicalId":52198,"journal":{"name":"Water Research X","volume":"22 ","pages":"Article 100213"},"PeriodicalIF":7.5,"publicationDate":"2024-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2589914724000033/pdfft?md5=07c36f8eabf8ee67b342196f5e3d5055&pid=1-s2.0-S2589914724000033-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139915153","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Low-cost monitoring systems for urban water management: Lessons from the field 城市水资源管理的低成本监测系统：来自实地的经验教训

IF 7.5 2区环境科学与生态学

Water Research X Pub Date : 2024-01-01 DOI: 10.1016/j.wroa.2024.100212

Perrine Hamel , Ning Ding , Frederic Cherqui , Qingchuan Zhu , Nicolas Walcker , Jean-Luc Bertrand-Krajewski , Paskorn Champrasert , Tim D. Fletcher , David T. McCarthy , Oldrich Navratil , Baiqian Shi

{"title":"Low-cost monitoring systems for urban water management: Lessons from the field","authors":"Perrine Hamel , Ning Ding , Frederic Cherqui , Qingchuan Zhu , Nicolas Walcker , Jean-Luc Bertrand-Krajewski , Paskorn Champrasert , Tim D. Fletcher , David T. McCarthy , Oldrich Navratil , Baiqian Shi","doi":"10.1016/j.wroa.2024.100212","DOIUrl":"10.1016/j.wroa.2024.100212","url":null,"abstract":"<div><p>Sound urban water management relies on extensive and reliable monitoring of water infrastructure. As low-cost sensors and networks have become increasingly available for environmental monitoring, urban water researchers and practitioners must consider the benefits and disadvantages of such technologies. In this perspective paper, we highlight six technical and socio-technological considerations for low-cost monitoring technology to reach its full potential in the field of urban water management, including: technical barriers to implementation, complementarity with traditional sensing technologies, low-cost sensor reliability, added value of produced information, opportunities to democratize data collection, and economic and environmental costs of the technology. For each consideration, we present recent experiences from our own work and broader literature and identify future research needs to address current challenges. Our experience supports the strong potential of low-cost monitoring technology, in particular that it promotes extensive and innovative monitoring of urban water infrastructure. Future efforts should focus on more systematic documenting of experiences to lower barriers to designing, implementing, and testing of low-cost sensor networks, and on assessing the economic, social, and environmental costs and benefits of low-cost sensor deployments.</p></div>","PeriodicalId":52198,"journal":{"name":"Water Research X","volume":"22 ","pages":"Article 100212"},"PeriodicalIF":7.5,"publicationDate":"2024-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2589914724000021/pdfft?md5=5ec1fc74ede0d17a8625fa1460d119d4&pid=1-s2.0-S2589914724000021-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139631726","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Ensuring microbial water quality for on-site water reuse: Importance of online sensors for reliable operation 确保现场回用水的微生物水质：在线传感器对可靠运行的重要性

IF 7.5 2区环境科学与生态学

Water Research X Pub Date : 2024-01-01 DOI: 10.1016/j.wroa.2024.100215

Eva Reynaert , Deepthi Nagappa , Jürg A. Sigrist , Eberhard Morgenroth

{"title":"Ensuring microbial water quality for on-site water reuse: Importance of online sensors for reliable operation","authors":"Eva Reynaert , Deepthi Nagappa , Jürg A. Sigrist , Eberhard Morgenroth","doi":"10.1016/j.wroa.2024.100215","DOIUrl":"10.1016/j.wroa.2024.100215","url":null,"abstract":"<div><p>A growing number of cities and regions are promoting or mandating on-site treatment and reuse of wastewater, which has resulted in the implementation of several thousand on-site water reuse systems on a global scale. However, there is only limited information on the (microbial) water quality from implemented systems. The focus of this study was on two best-in-class on-site water reuse systems in Bengaluru, India, which typically met the local water quality requirements during monthly compliance testing. This study aimed to (i) assess the microbial quality of the reclaimed water at a high temporal resolution (daily or every 15 min), and (ii) explore whether measurements from commercially available sensors can be used to improve the operation of such systems. The monitoring campaign revealed high variations in microbial water quality, even in these best-in-class systems, rendering the water inadequate for the intended reuse applications (toilet flushing and landscape irrigation). These variations were attributed to two key factors: (1) the low frequency of chlorination, and (2) fluctuations of the chlorine demand of the water, in particular of ammonium concentrations. Such fluctuations are likely inherent to on-site systems, which rely on a low level of process control. The monitoring campaign showed that the microbial water quality was most closely related to oxidation–reduction potential (ORP) and free chlorine sensors. Due to its relatively low cost and low need for maintenance, the ORP emerges as a compelling candidate for automating the chlorination to effectively manage variations in chlorine demand and ensure safe water reuse. Overall, this study underscores the necessity of integrating treatment trains, operation, and monitoring for safe on-site water reuse.</p></div>","PeriodicalId":52198,"journal":{"name":"Water Research X","volume":"22 ","pages":"Article 100215"},"PeriodicalIF":7.5,"publicationDate":"2024-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2589914724000057/pdfft?md5=1669853b85807b6e450d744ba8902ca0&pid=1-s2.0-S2589914724000057-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139966326","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Modeling sorption of environmental organic chemicals from water to soils 模拟环境有机化学物质从水到土壤的吸附作用

IF 7.5 2区环境科学与生态学

Water Research X Pub Date : 2024-01-01 DOI: 10.1016/j.wroa.2024.100219

Zhizhen Zhang , Shenghong Wang , Trevor N. Brown , Alessandro Sangion , Jon A. Arnot , Li Li

{"title":"Modeling sorption of environmental organic chemicals from water to soils","authors":"Zhizhen Zhang , Shenghong Wang , Trevor N. Brown , Alessandro Sangion , Jon A. Arnot , Li Li","doi":"10.1016/j.wroa.2024.100219","DOIUrl":"https://doi.org/10.1016/j.wroa.2024.100219","url":null,"abstract":"<div><p>Reliable estimation of chemical sorption from water to solid phases is an essential prerequisite for reasonable assessments of chemical hazards and risks. However, current fate and exposure models mostly rely on algorithms that lack the capability to quantify chemical sorption resulting from interactions with multiple soil constituents, including amorphous organic matter, carbonaceous organic matter, and mineral matter. Here, we introduce a novel, generic approach that explicitly combines the gravimetric composition of various solid constituents and poly-parameter linear free energy relationships to calculate the solid-water sorption coefficient (<em>K</em><sub>d</sub>) for non-ionizable or predominantly neutral organic chemicals with diverse properties in a neutral environment. Our approach demonstrates an overall statistical uncertainty of approximately 0.9 log units associated with predictions for different types of soil. By applying this approach to estimate the sorption of 70 diverse chemicals from water to two types of soils, we uncover that different chemicals predominantly exhibit sorption onto different soil constituents. Moreover, we provide mechanistic insights into the limitation of relying solely on organic carbon normalized sorption coefficient (<em>K</em><sub>OC</sub>) in chemical hazard assessment, as the measured <em>K</em><sub>OC</sub> can vary significantly across different soil types, and therefore, a universal cut-off threshold may not be appropriate. This research highlights the importance of considering chemical properties and multiple solid constituents in sorption modeling and offers a valuable theoretical approach for improved chemical hazard and exposure assessments.</p></div>","PeriodicalId":52198,"journal":{"name":"Water Research X","volume":"22 ","pages":"Article 100219"},"PeriodicalIF":7.5,"publicationDate":"2024-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2589914724000094/pdfft?md5=d32ca406f1a7aef137a78002b436141e&pid=1-s2.0-S2589914724000094-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140341967","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Efficient utilization of photoelectron-hole at semiconductor-microbe interface for pyridine degradation with assistance of external electric field 在外加电场的帮助下，高效利用半导体-微生物界面上的光电子-空穴降解吡啶

IF 7.5 2区环境科学与生态学

Water Research X Pub Date : 2024-01-01 DOI: 10.1016/j.wroa.2024.100214

Hefei Shi , Wenbo Fan , Xinbai Jiang , Dan Chen , Cheng Hou , Yixuan Wang , Yang Mu , Jinyou Shen

{"title":"Efficient utilization of photoelectron-hole at semiconductor-microbe interface for pyridine degradation with assistance of external electric field","authors":"Hefei Shi , Wenbo Fan , Xinbai Jiang , Dan Chen , Cheng Hou , Yixuan Wang , Yang Mu , Jinyou Shen","doi":"10.1016/j.wroa.2024.100214","DOIUrl":"https://doi.org/10.1016/j.wroa.2024.100214","url":null,"abstract":"<div><p>In this study, enhanced pyridine bio-photodegradation with assistance of electricity was achieved. Meanwhile, photoelectron-hole played a vital role in accelerating pyridine biomineralization. The significant separation of photoelectron-hole was achieved with an external electric field, which provided sufficient electron donors and acceptors for pyridine biodegradation. The enhanced electron transport system activity also revealed the full utilization of photoelectron-hole by microbes at semiconductor-microbe interface with assistance of electricity. Microbial community analysis confirmed the enrichment of functional species related to pyridine biodegradation and electron transfer. Microbial function analysis and microbial co-occurrence networks analysis indicated that upregulated functional genes and positive interactions of different species were the important reasons for enhanced pyridine bio-photodegradation with external electric field. A possible mechanism of enhanced pyridine biodegradation was proposed, i.e., more photoelectrons and holes of semiconductors were utilized by microbes to accelerate reduction and oxidation of pyridine with the assistance of electrical stimulation. The excellent performance of the photoelectrical biodegradation system showed a potential alternative for recalcitrant organic wastewater treatment.</p></div>","PeriodicalId":52198,"journal":{"name":"Water Research X","volume":"22 ","pages":"Article 100214"},"PeriodicalIF":7.5,"publicationDate":"2024-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2589914724000045/pdfft?md5=65ee6fe5feed72805286bf20b4893cea&pid=1-s2.0-S2589914724000045-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139986152","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Research stories along the urban water cycle 城市水循环研究故事

IF 7.5 2区环境科学与生态学

Water Research X Pub Date : 2024-01-01 DOI: 10.1016/j.wroa.2024.100218

Treavor H. Boyer , Wolfgang Gernjak

引用次数: 0

Removal of urea in ultrapure water system by urease-coated reverse osmosis membrane 用尿素酶涂层反渗透膜去除超纯水系统中的尿素

IF 7.5 2区环境科学与生态学

Water Research X Pub Date : 2024-01-01 DOI: 10.1016/j.wroa.2024.100211

Seung-Ju Choi , Lucas Crane , Seoktae Kang , Treavor H. Boyer , François Perreault

{"title":"Removal of urea in ultrapure water system by urease-coated reverse osmosis membrane","authors":"Seung-Ju Choi , Lucas Crane , Seoktae Kang , Treavor H. Boyer , François Perreault","doi":"10.1016/j.wroa.2024.100211","DOIUrl":"https://doi.org/10.1016/j.wroa.2024.100211","url":null,"abstract":"<div><p>Among the various substances found in the feed source for the production of ultrapure water (UPW), urea is challenging to remove because it is a small molecular weight molecule that is not easily oxidized and does not carry a charge under neutral pH conditions. Urease enzyme, found in various organisms such as plants and bacteria, catalyze the hydrolysis of urea into carbon dioxide and ammonia. In this study, urease was immobilized on the polyamide layer of a reverse osmosis (RO) membrane to remove urea in UPW systems. The removal efficiency of urea by urease-coated RO membrane showed up to 27.9 % higher urea removal efficiency compared to the pristine membrane. This increase in urea removal can be attributed to both physical and biological effects from the urease coating on the membrane. Firstly, urease on the membrane surface can act as an additional physical barrier for urea to pass through. Secondly, urea can be hydrolyzed by the enzyme when it passes through the urease-coated RO membrane. In a two-pass RO system typical for UPW production, the removal of urea by a urease-coated membrane would be enhanced by twofold. This overall method can significantly increase the removal efficiency of urea in UPW systems, especially when considering the compounded removal by the urease coating, rejection by RO, and additional reactions by other treatment processes. Moreover, urea in UPW systems can be removed without the installment of additional processes by simply coating urease on the existing RO membranes.</p></div>","PeriodicalId":52198,"journal":{"name":"Water Research X","volume":"22 ","pages":"Article 100211"},"PeriodicalIF":7.5,"publicationDate":"2024-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S258991472400001X/pdfft?md5=7a947ef7253f7558d3798de9aa059fdb&pid=1-s2.0-S258991472400001X-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139487597","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Efficient smartphone-based measurement of phosphorus in water 基于智能手机的水中磷高效测量方法

IF 7.5 2区环境科学与生态学

Water Research X Pub Date : 2024-01-01 DOI: 10.1016/j.wroa.2024.100217

Haiping Ai, Kai Zhang, Huichun Zhang

{"title":"Efficient smartphone-based measurement of phosphorus in water","authors":"Haiping Ai, Kai Zhang, Huichun Zhang","doi":"10.1016/j.wroa.2024.100217","DOIUrl":"https://doi.org/10.1016/j.wroa.2024.100217","url":null,"abstract":"<div><p>Agricultural runoff is one of the main sources of excess phosphorus (P) in different water bodies, subsequently leading to eutrophication and harmful algal blooms. To effectively monitor P levels in water, there is a need for simple measurement tools and extensive public involvement to enable regular and widespread sampling. Several smartphone-based P measurement methods have been reported, which extract red-green-blue (RGB) values from colorimetric reactions to build statistical regression models for P quantification. However, these methods typically require meticulous light conditions, involve initial equipment investment, and have undergone limited testing for large-scale applications. To overcome these limitations, this study developed a smartphone-based, equipment-free and facile P colorimetric analysis method. Following the standard procedure of the ascorbic acid approach, colorimetric reactions were captured by a smartphone camera, and RGB values were extracted using Python code for modeling. Different indoor light conditions, phone types, containers, and types of water samples were examined, resulting in a collection of 1922 images. The best regression model, employing random forest with RGB values and container types as inputs, achieved an R<sup>2</sup> of 0.97 and an RMSE of 0.051 for P concentrations ranging from 0.01 to 1.0 mg P/L. Additionally, the optimal classification model could estimate the level of P below 0.1 mg P/L with an accuracy of 95.2 (or 77.4 % for <0.05 mg P/L). The strong performance of the developed models, which are also available freely online, suggests an easy and effective tool for more frequent P measurement and greater public involvement.</p></div>","PeriodicalId":52198,"journal":{"name":"Water Research X","volume":"22 ","pages":"Article 100217"},"PeriodicalIF":7.5,"publicationDate":"2024-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2589914724000070/pdfft?md5=1ca9f055bd1a9fcb920a1fd605e425cd&pid=1-s2.0-S2589914724000070-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140069286","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0