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Potential of GIS and remote sensing in mapping land degradation: catchment of the Manyame River, Zimbabwe 地理信息系统和遥感在绘制土地退化图方面的潜力:津巴布韦Manyame河流域
IF 1.6 Q3 Environmental Science Pub Date : 2023-02-23 DOI: 10.2166/wpt.2023.025
H. Muhoyi, E. Muhoyi
The Manyame River Catchment area in Zimbabwe is experiencing severe land degradation mainly due to legal and illegal land husbandry practices. These practices are negatively impacting the sustainability of the existing ecosystems. The conditions of the land can be inferred using its vegetative cover, e.g., the Normalised Difference Vegetation Index (NDVI). Quantitative data relating to land degradation based on notable physical features such as gullies, for the Manyame River Catchment at landscape scales are poor. This study focused on the distribution and magnitude of land degradation in the Manyame River Catchment area. The study mapped out the contours of human-induced land degradation using a residual trend analysis (RESTREND) method. In particular, the study used remotely sensed data (NDVI and precipitation time series) to analyse the shifts over the period 2000–2017. The analysis used R statistical software packages (RESTREND and Kendall) and Geographic Information System (GIS) techniques to quantify the degradation trends. The results indicated extracts of those areas which experienced significant human-induced land degradation during the study period. RESTREND effectiveness was assessed using Mann–Kendall. The results of this study can be used by natural resource practitioners in monitoring, assessing, and managing environmental changes using GIS tools.
津巴布韦的Manyame河集水区正在经历严重的土地退化,这主要是由于合法和非法的土地耕作行为。这些做法对现有生态系统的可持续性产生了负面影响。土地的状况可以通过植被覆盖来推断,例如,标准化植被指数(NDVI)。在景观尺度上,与基于诸如沟壑等显著物理特征的土地退化有关的定量数据很少。本研究的重点是在Manyame河集水区土地退化的分布和程度。该研究使用残差趋势分析(RESTREND)方法绘制了人类引起的土地退化的轮廓。特别是,该研究使用遥感数据(NDVI和降水时间序列)来分析2000-2017年期间的变化。利用R统计软件包(RESTREND和Kendall)和地理信息系统(GIS)技术对退化趋势进行量化分析。研究结果表明,在研究期间,人类活动导致的土地退化程度较高的地区的提取物。采用Mann-Kendall评估RESTREND的有效性。本研究的结果可用于自然资源从业者使用GIS工具监测、评估和管理环境变化。
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引用次数: 2
Estimation of irrigation water requirement and irrigation scheduling for major crops using the CROPWAT model and climatic data 利用crowat模型和气候数据估算主要作物灌溉需水量和灌溉调度
IF 1.6 Q3 Environmental Science Pub Date : 2023-02-23 DOI: 10.2166/wpt.2023.024
Shumaila Soomro, G. S. Solangi, A. A. Siyal, Asad Golo, Nabi Bux Bhatti, A. G. Soomro, A. H. Memon, S. Panhwar, Hareef Ahmed Keerio
The world is facing an acute water shortage. The present irrigation techniques used in the Hyderabad district, Pakistan, are not demand-driven. The present study was carried out to determine the crop water requirement (CWR), irrigation water requirement (IWR), and irrigation scheduling for major crops grown in the Hyderabad district using the CROPWAT model based on climatic, soil, and crop data. The analysis revealed that the total CWR for the entire growing season for sugarcane, banana, cotton, and wheat were 3,127.0; 2,012.3; 1,073.5; and 418.9 mm, respectively. However, the IWR for sugarcane, banana, cotton, and wheat for the entire growing season was found to be 2,964.0; 1,966.7; 1,052.7; and 407.6 mm, respectively. However, the contribution of rainfall was 163.0, 45.6, 20.8, and 11.3 mm during sugarcane, banana, cotton, and wheat, respectively. The CWR and IWR were higher during the dry season due to high temperatures and low relative humidity. However, the IWR of each crop was low in the initial stage which increased with the growing stage until the peak at the full growth stage. The study recommends the use of CROPWAT to investigate the irrigation water requirements with accuracy.
世界正面临严重的缺水问题。巴基斯坦海得拉巴地区目前使用的灌溉技术不是由需求驱动的。本研究采用基于气候、土壤和作物数据的CROPWAT模型,确定海得拉巴地区主要作物的作物需水量(CWR)、灌溉需水量(IWR)和灌溉调度。分析表明,甘蔗、香蕉、棉花和小麦在整个生长季节的总CWR为3127.0;2012.3;1073.5;和418.9毫米。然而,甘蔗、香蕉、棉花和小麦在整个生长季节的IWR为2964.0;1966.7;1052.7;和407.6mm。然而,甘蔗、香蕉、棉花和小麦的降雨量贡献分别为163.0、45.6、20.8和11.3毫米。旱季由于高温和低相对湿度,CWR和IWR较高。然而,每种作物的IWR在初始阶段都很低,随着生长阶段的增加而增加,直到完全生长阶段达到峰值。该研究建议使用CROPWAT来准确地调查灌溉用水需求。
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引用次数: 0
Removal of cationic dyes from a synthetic effluent using a calcium surfactant 用钙表面活性剂去除合成废水中的阳离子染料
IF 1.6 Q3 Environmental Science Pub Date : 2023-02-22 DOI: 10.2166/wpt.2023.021
Y. N. Teixeira, F. J. D. P. Filho, Vinícius Pereira Bacurau, J. Menezes, Daniel Bernardes Silva, Jober de Queiroz dos Santos, Raimundo N. P. Teixeira, J. V. Nunes
The present study aimed to evaluate the removal efficiency of two types of cationic dyes of different classes – methylene blue (MB) and malachite green (MG) – from a synthetic effluent using a calcium surfactant (CaSF) originated from used frying soybean oil. The Fourier Transform Infrared Spectroscopy (FTIR) spectra showed that the functional groups present on the surface of CaSF can form surface complexes or bonds with the dye molecules and, consequently, promote their adsorption. The adsorption kinetics studies indicated that the equilibrium point of the process is reached in 90 min for both dyes. Equilibrium studies indicated that the adsorption isotherm models that best fit MB and MG were the Langmuir and the Dubinin–Radushkevich models, respectively. The maximum adsorption capacities of MB and MG, according to the Langmuir model, were 199 and 123 mg·g−1, respectively. In the sight of the high MB and MG removal efficiency (84 and 100%, respectively), the use of CaSF is an excellent alternative for the treatment of effluents contaminated by cationic dyes. The adsorption–desorption cycle studies showed that CaSF maintains a good dye removal efficiency for up to three cycles.
本研究旨在评估使用源自用过的油炸大豆油的钙表面活性剂(CaSF)从合成废水中去除两种不同类别的阳离子染料——亚甲基蓝(MB)和孔雀石绿(MG)的效率。傅立叶变换红外光谱(FTIR)表明,存在于CaSF表面的官能团可以与染料分子形成表面络合物或键,从而促进其吸附。吸附动力学研究表明,两种染料在90分钟内都达到了平衡点。平衡研究表明,最适合MB和MG的吸附等温线模型分别为Langmuir模型和Dubinin–Radushkevich模型。根据Langmuir模型,MB和MG的最大吸附量分别为199和123mg·g−1。鉴于MB和MG的高去除效率(分别为84%和100%),使用CaSF是处理被阳离子染料污染的废水的极好替代方案。吸附-解吸循环研究表明,CaSF在长达三个循环的时间内保持良好的染料去除效率。
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引用次数: 1
Spatial evaluation of groundwater quality using factor analysis and geostatistical Kriging algorithm: a case study of Ibadan Metropolis, Nigeria 基于因子分析和地质统计Kriging算法的地下水质量空间评价——以尼日利亚伊巴丹市为例
IF 1.6 Q3 Environmental Science Pub Date : 2023-02-22 DOI: 10.2166/wpt.2023.023
E. Thomas
Necessity calls for the environmental aspects of groundwater to be evaluated and properly managed based on the observed spatial distribution with respect to quality, as it contributes to a significant portion of average water usage globally. Variations in groundwater quality in the Ibadan Metropolis might be a result of physical and chemical trends in the region leading to a decline in quality. The study was geared towards the spatial evaluation of groundwater quality using factor analysis and the Kriging algorithm. The parameters examined include pH, electrical conductivity, total dissolved solids, carbonates, chloride, nitrate, sulphate, calcium, sodium, magnesium, and potassium, which were sampled and analysed from the existing municipal deep wells in the Ibadan Metropolitan area; and distribution maps of each parameter were created using a geostatistical approach. Factor analysis examined the relationship between human activities and concentration levels. Semi-variograms were tested to ascertain the best-fitted model accuracy measures, average standard error, root mean square error, and root mean square error standardised. The groundwater index was calculated to ascertain the drinkability of the water in the study area. Overall, the result shows that the groundwater in the study area is suitable for consumption; drinking, and other uses. Kriging is a suitable assessment tool for modelling environmental parameters.
必要性要求根据观察到的水质空间分布对地下水的环境方面进行评估和适当管理,因为地下水在全球平均用水量中占很大一部分。伊巴丹大都会地下水水质的变化可能是该地区物理和化学趋势导致水质下降的结果。该研究旨在利用因子分析和克里格算法对地下水质量进行空间评价。检查的参数包括pH、电导率、总溶解固体、碳酸盐、氯化物、硝酸盐、硫酸盐、钙、钠、镁和钾,这些参数是从伊巴丹都市区现有的市政深井中取样和分析的;并且使用地质统计学方法创建每个参数的分布图。因子分析检验了人类活动与注意力水平之间的关系。对半变差函数进行测试,以确定最佳拟合的模型精度测量、平均标准误差、均方根误差和标准化的均方根误差。计算地下水指数以确定研究区域内的水的可饮用性。总体而言,研究结果表明,研究区地下水适宜消耗;饮酒和其他用途。克里格法是一种适用于环境参数建模的评估工具。
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引用次数: 3
Withdrawn: Desalination of saline fields by soil leaching in the Karkhehnur Watershed, Iran 撤回:伊朗Karkhehnur流域土壤浸出对盐碱地的淡化作用
Q3 Environmental Science Pub Date : 2023-02-21 DOI: 10.2166/wpt.2023.022
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引用次数: 0
Study of GIS-based groundwater potential zones for agricultural sustainability: an arid region 基于GIS的农业可持续地下水潜力区研究:干旱地区
IF 1.6 Q3 Environmental Science Pub Date : 2023-02-15 DOI: 10.2166/wpt.2023.020
A. H. Memon, A. G. Soomro, S. Panhwar, Hareef Ahmed Keerio, Naddar Hussain Khokhar, J. K. Bajkani, Sabeen Siddiqui, M. A. Gadehi
The cluster-wise area of shallow and deep aquifer zones is used to estimate the potential of groundwater. The potential of the shallow aquifer zone is estimated at 4.61 MCM (million cubic meters) and for the deep aquifer zone at 17,509.03 MCM, while the total groundwater potential for both aquifer zones is estimated at 17,513.64 MCM. The Geographical Information System (GIS) was employed efficiently to estimate the subsurface volume of the lithological rock layers using cost-effective and time-saving techniques, while the Rockwork software integrated with GIS was successfully used to visualize the subsurface lithology and stratigraphy of the aquifer zones. The estimated potential of groundwater can be uncovered by using the alternative solar pumping system to improve the agricultural system in the study area, thereby reducing the migration rate, reducing poverty, and improving the socio-economic conditions of livelihood. In the future, too, it will be essential to design water quality studies to ensure the proper use of groundwater.
浅层和深层含水层的聚类区域用于估计地下水的潜力。浅层含水层的潜力估计为461百万立方米,深层含水层为17509.03百万立方米,而两个含水层的地下水总潜力估计为17513.64百万立方米。地理信息系统(GIS)被有效地用于使用具有成本效益和省时的技术来估计岩性岩层的地下体积,而与GIS集成的Rockwork软件被成功地用于可视化含水层的地下岩性和地层。可以通过使用替代太阳能抽水系统来改善研究区域的农业系统,从而降低移民率,减少贫困,改善社会经济生活条件,从而揭示地下水的估计潜力。在未来,设计水质研究以确保地下水的正确利用也将是至关重要的。
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引用次数: 1
Bio-based activated carbon from husk- and wood-based biomass: comparison of carbon activation methods on organic pollutants removal 壳基和木质生物质生物基活性炭:活性炭活化方法去除有机污染物的比较
IF 1.6 Q3 Environmental Science Pub Date : 2023-02-15 DOI: 10.2166/wpt.2023.019
Oleksii Tomin, M. Yazdani
This study aimed to investigate the effect of different activations on the properties of bio-based activated carbons (BACs) for water treatment. BACs were produced via pyrolysis by the carbonization stage and were followed by four different activation procedures. Chemical activation included the introduction of metal oxides or alkali on the structure of the sawdust-derived BACs, resulting in iron-activated carbon (BAC-Fe), copper-activated carbon (BAC-Cu), and sodium-activated carbon (BAC-Na). The physical activation was conducted in a CO2 environment with the usage of two types of locally available biomasses, resulting in husk-activated carbon (HAC) and wood-activated carbon (WAC). Depending on the activation, BACs can be developed with high porosity, active sites, and different additional functionalities such as antimicrobial and magnetic. The adsorption of natural organic matter (NOM) with chemically activated BACs yielded high removal percentages (97, 87, and 80% for BAC-Fe, BAC-Cu, and BAC-Na, respectively). The physically activated BACs demonstrated high adsorption capacities for dye – 278 mg/g for WAC and 213 mg/g for HAC. This outlines a wide range of BAC production possibilities with advanced functionalities.
本研究旨在研究不同活化剂对水处理用生物基活性炭(BACs)性能的影响。BAC是通过碳化阶段的热解产生的,随后经过四种不同的活化程序。化学活化包括在木屑衍生的BAC的结构上引入金属氧化物或碱,产生铁活性炭(BAC-Fe)、铜活性炭(BAC-Cu)和钠活性炭(BAC-Na)。物理活化是在CO2环境中进行的,使用了两种当地可用的生物质,产生了外壳活性炭(HAC)和木材活性炭(WAC)。根据活化情况,BAC可以开发出高孔隙率、活性位点和不同的附加功能,如抗菌和磁性。化学活化的BACs对天然有机物(NOM)的吸附产生了高去除率(BAC-Fe、BAC-Cu和BAC-Na分别为97、87和80%)。物理活化的BAC对染料的吸附能力很高——WAC为278 mg/g,HAC为213 mg/g。这概述了具有先进功能的广泛BAC生产可能性。
{"title":"Bio-based activated carbon from husk- and wood-based biomass: comparison of carbon activation methods on organic pollutants removal","authors":"Oleksii Tomin, M. Yazdani","doi":"10.2166/wpt.2023.019","DOIUrl":"https://doi.org/10.2166/wpt.2023.019","url":null,"abstract":"\u0000 This study aimed to investigate the effect of different activations on the properties of bio-based activated carbons (BACs) for water treatment. BACs were produced via pyrolysis by the carbonization stage and were followed by four different activation procedures. Chemical activation included the introduction of metal oxides or alkali on the structure of the sawdust-derived BACs, resulting in iron-activated carbon (BAC-Fe), copper-activated carbon (BAC-Cu), and sodium-activated carbon (BAC-Na). The physical activation was conducted in a CO2 environment with the usage of two types of locally available biomasses, resulting in husk-activated carbon (HAC) and wood-activated carbon (WAC). Depending on the activation, BACs can be developed with high porosity, active sites, and different additional functionalities such as antimicrobial and magnetic. The adsorption of natural organic matter (NOM) with chemically activated BACs yielded high removal percentages (97, 87, and 80% for BAC-Fe, BAC-Cu, and BAC-Na, respectively). The physically activated BACs demonstrated high adsorption capacities for dye – 278 mg/g for WAC and 213 mg/g for HAC. This outlines a wide range of BAC production possibilities with advanced functionalities.","PeriodicalId":23794,"journal":{"name":"Water Practice and Technology","volume":null,"pages":null},"PeriodicalIF":1.6,"publicationDate":"2023-02-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41528689","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
Green synthesis of granular activated carbon/zinc ferro nanocomposites-based bioleached laterite iron (BLaFe) for the removal of Rhodamine B in water using adsorption–Fenton's oxidation process 绿色合成颗粒活性炭/锌铁纳米复合材料基生物漂白红土铁(BLaFe),用于吸附-芬顿氧化法去除水中的罗丹明B
IF 1.6 Q3 Environmental Science Pub Date : 2023-02-15 DOI: 10.2166/wpt.2023.014
B. S, R. K N, Manu B., M. Y. Sreenivasa
Novel cost-effective catalyst granular activated carbon (GAC)-based zinc ferro nanocomposites for the heterogeneous Fenton's oxidation of dye were synthesized using bioleached laterite iron (BLFe) as a precursor and Psidium gujava leaf extract. Synthesized nanocomposites were characterized using SEM, EDS, XRD and BET surface area analysis. The degradation of Rhodamine dye was carried out with nanocomposites using adsorption–Fenton's oxidation process. The catalytic role of nanocomposites in Fenton's oxidation of Rhodamine B (RhB) was investigated and reported. The maximum dye removal of 96.2% was observed with 64.2% COD removal within 200 min of treatment. An increase in nanocomposite dosage has a positive effect on dye removal marking 5 g/L as an optimum dosage. Adsorption studies reveal that RhB removal using BLFe-based GAC/zinc ferro composites fits the Freundlich Adsorption Isotherm model with an adsorption capacity of 47.81 mg/g. A combination of adsorption and Fenton's oxidation has resulted in higher removal efficiency with nanocomposite material. Reusability studies confirm that the spent catalyst can be reused for five cycles.
以生物浸出的红土铁(BLFe)为前驱体,以番石榴叶提取物为原料,合成了一种用于染料非均相Fenton氧化的新型高效催化剂颗粒活性炭(GAC)基锌铁纳米复合材料。利用SEM、EDS、XRD和BET比表面积分析对合成的纳米复合材料进行了表征。采用吸附-芬顿氧化法,用纳米复合材料对罗丹明染料进行降解。研究并报道了纳米复合材料在芬顿氧化罗丹明B(RhB)中的催化作用。在处理的200分钟内,观察到最大的染料去除率为96.2%,COD去除率为64.2%。纳米复合材料用量的增加对染料去除有积极影响,标记5g/L为最佳用量。吸附研究表明,使用BLFe基GAC/锌铁复合材料去除RhB符合Freundlich吸附等温线模型,吸附容量为47.81mg/g。吸附和芬顿氧化的结合导致纳米复合材料具有更高的去除效率。可重复使用性研究证实,废催化剂可以重复使用五个循环。
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引用次数: 1
Minimum night flow (MNF) and corrosion control in compliance with internet of things (IoT) for water systems 最小夜流量(MNF)和腐蚀控制符合物联网(IoT)的水系统
IF 1.6 Q3 Environmental Science Pub Date : 2023-02-14 DOI: 10.2166/wpt.2023.012
Kian Hariri Asli, Kaveh Hariri Asli
In the new world view, water is considered an economic-social commodity and a basic human need. This work aims to investigate the relationship between corrosion and changes in the minimum night flow (MNF) rate in water systems. Changes in MNF as a dependent variable are affected by changes in independent variables such as total unreported water loss, allowed night consumption, and network field leakage. First of all, the share of water loss due to network corrosion in total unreported water loss was investigated through a mathematical model and regression analysis according to Geography Information System (GIS). As a result, the p-value for pressure was .564. The Power function had a suitable correlation on the scatter diagram and best-fit curve which was used for Inflow to the water distribution network based on the regression model. The error of the consumers' meter and the correction of these errors were discussed in the apparent water loss section. The apparent water loss value was equal to 1.12% of produced water. This amount of apparent water loss showed the share of the actual water loss due to network corrosion from the total unreported water loss in the facilities.
在新的世界观中,水被认为是一种经济社会商品,也是人类的基本需求。本工作旨在研究腐蚀与水系统中最小夜间流量(MNF)变化之间的关系。MNF作为因变量的变化受到自变量变化的影响,如未报告的总水量、允许的夜间消耗量和网络现场泄漏。首先,根据地理信息系统(GIS),通过数学模型和回归分析,研究了网络腐蚀造成的水损失在未报告的总水损失中所占的份额。结果,压力的p值为.564。在回归模型的基础上,幂函数在用于进水到配水管网的散点图和最佳拟合曲线上具有合适的相关性。用户仪表的误差以及这些误差的校正在表观失水部分进行了讨论。表观失水值相当于采出水的1.12%。这一表观水损失量显示了由于网络腐蚀造成的实际水损失在设施中未报告的总水损失中所占的份额。
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引用次数: 0
Activated carbon production from plum pit shells for oily wastewater treatment 利用李壳生产活性炭处理含油污水
IF 1.6 Q3 Environmental Science Pub Date : 2023-02-10 DOI: 10.2166/wpt.2023.018
Yessenbek Assylbek, M. Satayev, A. Azimov
The aim of the research is the production of activated carbon from the plum pit shells in a drum-type steam-gas activation furnace. To study the production of activated carbon, methods were used based on the study of individual patterns, analysis of the specific surface, determination of the porous structure, analysis of the structural-sorption and physicochemical characteristics of the pit shell. The novelty is research on determining the characteristics of activated carbon and the effect of thermal activation temperature in a flow of CO2 and H2O in a mass ratio of 20:80 on the total pore volume. During activation at a process temperature of 780 °C, the surface was destroyed by powerful thermal activation, and as a result, micropores of 8–10 μm formed and a cell configuration arose. The adsorption kinetics showed that the maximum efficiency is achieved at a duration of 0.5 h for chloroform-extracted and 2 h for hexane-extracted oil products, as well as an adsorbent dose of 4 kg/m3. The results obtained in the research of the process of oily wastewater treatment showed that the effect of treatment with the activated plum pit shells (95.5%) is greater than the effect of treatment with coagulants and clays (88.5–71)%.
本研究的目的是在滚筒式蒸汽-气体活化炉中用李壳生产活性炭。为了研究活性炭的生产,使用了基于对单个图案的研究、比表面积的分析、多孔结构的测定、坑壳的结构吸附和物理化学特性的分析的方法。新颖之处在于研究确定活性炭的特性以及质量比为20:80的CO2和H2O流中的热活化温度对总孔体积的影响。在780°C的工艺温度下活化过程中,表面被强大的热活化破坏,因此形成了8-10μm的微孔,并形成了细胞结构。吸附动力学表明,对于氯仿提取的持续时间为0.5小时,对于己烷提取的油产品持续时间为2小时,以及吸附剂剂量为4kg/m3时,达到最大效率。对含油废水处理工艺的研究结果表明,活性李壳处理含油废水的效果(95.5%)大于混凝剂和粘土处理含油废水(88.5–71)%。
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引用次数: 0
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Water Practice and Technology
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