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Identification of Saline Water Intrusion Using Integrated Geoelectrical Method in the Coastal Aquifer of Holo-Quaternary Formation, Lampung Bay 综合地电法识别南榜湾全第四纪海岸含水层盐水入侵
Q3 Environmental Science Pub Date : 2022-09-29 DOI: 10.35762/aer.2022.44.3.6
Rustadi, A. Setiawan, I. Darmawan, Suharno, Nandi Haerudin
Increased groundwater extraction from aquifers in Holo-Quaternary rock formations in Lampung Bay has caused saltwater intrusion. This indication appears in several community wells and can spread further inland. Therefore, this study aims to identify the distribution of areas exposed to saline water and the boundaries of areas that have not, especially in the Holo-Quaternary Formation. This research uses the geoelectric method integrated with salinity data and the Soil Penetration Test (SPT) analysis at four drilling points. A total of 4 lines of Electrical Resistivity Tomography (ERT) and 8 points of Vertical Electrical Sounding (VES) have been acquired with a Schlumberger configuration with an AB/2 span of up to 200 meters. Meanwhile, the salinity data was measured directly from 60 samples from community wells. The ERT and VES analysis results show that the coastal aquifer in Lampung Bay is at a depth of 2–24 m. SPT analysis identified interbedded sand, silt, and clay which were interpreted as marine sedimentation from the Holo-Quaternary Formation layer. Groundwater is only in shallow aquifers (less than 24 m) but has experienced seawater intrusion with low resistivity values between 9–20 ohm m. The distribution of high salinity values up to 3,100 ppm has reached more than 1 km from the coastline. Furthermore, ERT results reinforce this finding, which shows low resistivity values of less than 10 ohm m in the shallow aquifer zone. VES data detects low resistivity values (18 ohm m) at a depth of 12–13 m.
南榜湾全第四纪地层含水层地下水采掘增加,导致海水入侵。这一迹象出现在一些社区井中,并可能进一步向内陆蔓延。因此,本研究旨在确定咸水暴露区域的分布和非咸水暴露区域的边界,特别是在全新第四纪组。本研究采用地电法结合矿化度数据和四个钻孔点的土壤渗透试验(SPT)分析。利用斯伦贝谢的AB/2跨度达200米的配置,共获得了4条电阻率断层扫描(ERT)线和8个垂直电测深(VES)点。同时,从60个社区井中直接测量了盐度数据。ERT和VES分析结果表明,南榜湾沿海含水层深度为2 ~ 24 m。SPT分析发现了互层砂、粉砂和粘土,它们被解释为来自全第四纪地层的海相沉积。地下水仅在浅层含水层(小于24米)中,但经历了9-20欧姆之间的低电阻率海水入侵。高盐度值分布在距离海岸线1公里以上的地区,最高可达3100 ppm。此外,ERT结果强化了这一发现,显示浅层含水层的低电阻率值小于10欧姆。VES数据探测深度为12 ~ 13 m的低电阻率值(18 ω m)。
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引用次数: 0
The Driving Force of Urban Water Body Change in Chonburi Province, Thailand 泰国春武里省城市水体变化的驱动力
Q3 Environmental Science Pub Date : 2022-09-29 DOI: 10.35762/aer.2022.44.3.5
Nararuk Boonyanam, S. Bejranonda
The rapid urbanization from special economic zones (SEZs) in Asia poses a risk on water crisis. This paper identifies water body change trend and its driving force of change in Chonburi province; the most urbanized area in the Eastern Economic Corridor (EEC) of Thailand, in order to analyse the root cause of water shortage in the area. Land use maps from 2006 to 2019 were used to evaluate the changing trend in water bodies using land use transition matrix and land use dynamic degree. Panel data from 364 observations in the Chonburi sub-district was used to assess the driving forces of water body change using panel data analysis. The study reveals that the water bodies are experiencing an increasing trend at the annual rate of 10.72%. The most predominant factor of change is the type of governance, followed by agricultural land use, climate change and population respectively. The results highlight the increasing trend of human-made urban water bodies, the importance of the local authority and the need of international collaboration. Therefore, the government should consider to strengthen measures and policy relative to water body change in the area in order to induce significant impact on future urban water supply.
亚洲经济特区的快速城市化带来了水资源危机的风险。确定了春武里省水体变化趋势及其驱动力;泰国东部经济走廊(EEC)中城市化程度最高的地区,以分析该地区缺水的根本原因。利用2006 - 2019年土地利用图,利用土地利用过渡矩阵和土地利用动态性评价水体变化趋势。利用春武里街道364次观测的面板数据,采用面板数据分析方法对水体变化驱动力进行了评价。研究表明,水体正以每年10.72%的速度增加。最主要的变化因素是治理类型,其次是农业用地、气候变化和人口。研究结果强调了人造城市水体的增加趋势、地方当局的重要性以及国际合作的必要性。因此,政府应考虑加强与该地区水体变化相关的措施和政策,以对未来城市供水产生重大影响。
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引用次数: 1
Performance of Porous Substrates for Domestic Wastewater Treatment under Prolonged Hydraulic Retention Time 延长水力滞留时间下多孔基质处理生活污水的性能研究
Q3 Environmental Science Pub Date : 2022-08-31 DOI: 10.35762/aer.2022.44.3.4
Pakawat Janyasupab, A. Jampeetong
Physicochemical characteristics of porous substrates (longan biochar, corn biochar, and pumice) including specific surface area (SSA), pore volume (Vp), and cation exchange capacity (CEC) were determined. Longan biochar had the highest SSA, Vp, and CEC, followed by corn biochar and pumice. Then, columns filled with each of these 3 substrates together with gravel as a control treatment, were evaluated to compare wastewater treatment efficiency under different hydraulic retention times (HRTs). Each system had been acclimatized with wastewater for 8 weeks. Then, influent and effluent were analyzed at 1, 3, 5, and 7 day intervals. Water analysis revealed that biochar-based systems showed higher dissolved oxygen (DO) development and greater removal of biochemical oxygen demand (BOD5), total suspended solids (TSS), ammonium (NH4-N), total Kjeldahl nitrogen (TKN), and nitrate (NO3-N) than pumice and gravel-based systems. Prolongation of HRT significantly increased NO3-N removal and slightly increased BOD5 and TSS removal. Both BOD5 and TSS removal in biochar-based systems after 1 day HRT was about 93–94% while they significantly increased with HRT extension to a high of 97–98%. Furthermore, NO3-N removal in biochar-based systems increased from 47–48% after 1 day HRT to 80% after 5–7 days HRT. In addition, NH4-N and TKN removal was influenced by both substrate and HRT with significant interaction between these two factors. Longan biochar-based systems, in particular eliminated almost 90% of both NH4-N and TKN and the removal efficiency improved significantly after HRT was extended. Meanwhile, both NH4-N and TKN removal were only 20–30% in the gravel-based systems and 50-60% in pumice-based system. The study suggests that longan biochar is the most effective substrate. Longer HRTs were also found to increase the efficiency of removing organic matter and nitrogen.
测定了多孔基质(龙眼生物炭、玉米生物炭和浮石)的理化特性,包括比表面积(SSA)、孔隙体积(Vp)和阳离子交换容量(CEC)。龙眼生物炭的SSA、Vp和CEC最高,玉米生物炭次之,浮石次之。然后,分别填充这3种基质和砾石作为对照处理,对不同水力滞留时间(HRTs)下的废水处理效率进行了评估。每个系统都用废水驯化了8周。然后,每隔1、3、5和7天对进水和出水进行分析。水分析表明,与浮石和砾石体系相比,生物炭体系具有更高的溶解氧(DO)生成和生化需氧量(BOD5)、总悬浮固体(TSS)、铵态氮(NH4-N)、总凯氏定氮(TKN)和硝酸盐(NO3-N)的脱除能力。延长HRT显著提高NO3-N去除率,略微提高BOD5和TSS去除率。HRT 1天后,生物炭基系统的BOD5和TSS去除率均为93-94%左右,而HRT延长后,BOD5和TSS去除率显著提高至97-98%。此外,生物炭基系统的NO3-N去除率在HRT 1天后从47-48%增加到HRT 5-7天后的80%。此外,NH4-N和TKN的去除率受底物和HRT的共同影响,两者之间存在显著的相互作用。尤其是龙眼生物炭体系,对NH4-N和TKN的去除率均接近90%,HRT延长后去除率显著提高。同时,在砾石基体系中,NH4-N和TKN的去除率仅为20-30%,在浮石基体系中为50-60%。研究表明,龙眼生物炭是最有效的基质。更长的hrt也被发现可以提高去除有机物和氮的效率。
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引用次数: 0
Disinfection By-product Precursor Removal by Biochar Derived from Agricultural Waste 从农业废弃物中提取生物炭去除消毒副产物前体
Q3 Environmental Science Pub Date : 2022-08-11 DOI: 10.35762/aer.2022.44.3.3
P. Jutaporn, Sorawit Ritthisoonthorn, Yuvarat Ngernyen, Lippakorn Songnangrong, Warodom Rattanaboonta, W. Khongnakorn
Biochar made from agricultural waste products can be used as a low-cost adsorbent targeting dissolved organic matter (DOM). In water treatment plant (WTP), DOM reacts with chlorine-based disinfectant and forms carcinogenic disinfection by-products. The objective of this study was to investigate the applicability of bamboo biochar derived from wood vinegar production waste as an adsorbent for DOM removal and subsequently trihalomethane formation potential (THM-FP) reduction. Raw biochar (BCRaw) and 800°C post-heated biochar (BC800) was tested for its surface characteristics including scanning electron microscopy, Fourier transform infrared spectroscopy and Brunauer, Emmett and Teller analysis. The post-pyrolysis treatment increased the surface area of the biochar from 90.3 to 274 m2 g-1. Raw natural water collected from Tapra WTP, Khon Kaen, Thailand, which uses the Chi River as its water source. The adsorption capacities for dissolve organic carbon at 24-h equilibrium (Qe) of BCRaw and BC800 were 0.148 and 0.551 mg-C g-1 adsorbent, respectively. The adsorption kinetics were described well with a pseudo-second order model, which implied chemisorption and multiple adsorption mechanisms. While THM-FP was relatively unaffected by a treatment with BCRaw, a treatment with BC800 resulted in 12.4% THM-FP reduction and preferential removal of precursor to chloroform over other THMs was observed. Fluorescent excitation-emission matric spectroscopy was employed to characterize DOM before and after treatment with biochar. BC800 achieved greater removal of terrestrial humic-like and fulvic-like DOM, due to the presence of oxygen functional groups, which enhances removal capacity for aromatic compounds. Overall, this study shows the potential use of bamboo biochar derived from waste material as an adsorbent for THM precursor removal.
由农业废弃物制成的生物炭可以作为一种低成本的针对溶解有机物(DOM)的吸附剂。在水处理厂(WTP)中,DOM与含氯消毒剂发生反应,形成致癌的消毒副产物。本研究的目的是研究从木醋生产废料中提取的竹生物炭作为吸附剂去除DOM和随后降低三卤甲烷生成势(THM-FP)的适用性。对生生物炭(BCRaw)和800°C后加热生物炭(BC800)的表面特征进行了测试,包括扫描电镜、傅里叶变换红外光谱和Brunauer、Emmett和Teller分析。热解后处理使生物炭的表面积由90.3增加到274 m2 g-1。从泰国孔敬的Tapra WTP收集的原始天然水,该WTP使用Chi河作为其水源。BCRaw和BC800吸附剂对溶解有机碳的24 h平衡吸附量(Qe)分别为0.148和0.551 mg-C g-1。吸附动力学用拟二级吸附模型描述得很好,该模型暗示了化学吸附和多重吸附机制。虽然THM-FP相对不受BCRaw处理的影响,但BC800处理导致THM-FP还原12.4%,并且比其他thm更优先去除前体氯仿。采用荧光激发发射基质光谱法对生物炭处理前后DOM进行了表征。BC800对陆生腐植酸类和黄腐酸类DOM的去除效果较好,这是由于其含氧官能团的存在,增强了对芳香族化合物的去除能力。总的来说,这项研究显示了从废物中提取的竹生物炭作为去除THM前体的吸附剂的潜在用途。
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引用次数: 0
Assessing Vegetation Cover Change Using Remote Sensing: Case Study at Binh Duong Province, Vietnam 利用遥感评估植被覆盖变化:以越南平阳省为例
Q3 Environmental Science Pub Date : 2022-08-01 DOI: 10.35762/aer.2022.44.3.2
Nguyễn Thị Huyền, Lê Hoàng Tú, Le Truong Ngoc Han, Vuong Thi Thuy, Dang Nguyen Dong Phuong, Nguyen Kim Loi
This study aims to present the application of remote sensing in monitoring vegetation change in Binh Duong Province, Vietnam. The study used Landsat 5 images in the year 2010 and Landsat 8 images in the years 2015 and 2020 to investigate the area of vegetation. The maximum likelihood classification method (MLC) was used to classify land cover and an accuracy matrix was computed to validate the classification results. The references data were collected to support classification and accuracy assessment processes including land use maps in 2010, 2015, and 2020. In addition, collected field points and UAV (unmanned aerial vehicle) in 2020 were used. The overall accuracies are 81.27%, 84.41%, and 83.86%, and Kappa indices were 0.76, 0.80, and 0.80, corresponding to 2010, 2015, and 2020. The results showed that as compared to 2010 and 2015, the area of vegetation in 2020 decreased 10% and 8%, respectively. The average vegetation cover per capita was 740 m2 person-1 in 2020, compared to 1000 m2 person-1 in 2015 and 1200 m2 person-1 in 2010. This reduction was obvious in urban areas in the province, due to the need for construction and development. The study provides meaningful information on vegetation change and green area per capita in Binh Duong Province from 2010 to 2020.
本研究旨在介绍遥感技术在越南平阳省植被变化监测中的应用。该研究使用了2010年的Landsat 5图像和2015年和2020年的Landsat 8图像来调查植被面积。采用最大似然分类法(MLC)对土地覆盖进行分类,并计算精度矩阵对分类结果进行验证。收集参考数据以支持分类和精度评估过程,包括2010年、2015年和2020年的土地利用图。此外,还使用了2020年收集的现场点和无人机(UAV)。2010年、2015年和2020年的总体准确率分别为81.27%、84.41%和83.86%,Kappa指数分别为0.76、0.80和0.80。结果表明:与2010年和2015年相比,2020年植被面积分别减少10%和8%;2020年人均植被覆盖面积为740 m2, 2015年为1000 m2, 2010年为1200 m2。由于建设和发展的需要,这种减少在该省的城市地区是明显的。该研究为2010 - 2020年平阳省的植被变化和人均绿化面积提供了有意义的信息。
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引用次数: 1
Spatial Distribution of Bioavailable Metal Concentrations and Total Metal Concentration-depth Relationship along the Sediment Profile within Phuket Bay 普吉湾沉积物剖面生物有效金属浓度和总金属浓度-深度关系的空间分布
Q3 Environmental Science Pub Date : 2022-08-01 DOI: 10.35762/aer.2022.44.3.1
P. Akkajit, D. Tipmanee, Kaimook Jaileak
Heavy metals in coastal sediments can adversely affect human health and the environment. The distribution and metal bioavailability of Pb and Zn in 21 sediment samples collected from Phuket Bay, Phuket, Thailand using the first-two steps of sequential extraction proposed by the Standards, Measurements and Testing programme (known as BCR) was determined. The results showed that Pb formed weak complexes contributing up to 11.2% to 33% of its total concentration (1.7 to 7.5 mg kg-1) in the first fraction (BCR1), while Zn in the BCR1 fraction ranged from 4.9% to 9.9%. The results suggest that Pb could easily enter the food chain and the main cause of heavy metal contamination is related to local anthropogenic activities and effects of urbanization in the region, such as the ferry terminal, boatyards, and other maritime activities. Meanwhile, the enrichment factors of the metals showed minor to moderately severe enrichment. The metal concentration-depth relationship along the sediment profile showed metal concentration in each layer of the sediment core ranging from 45.4 to 88 mg Zn kg-1 and from 12.7 to 44.5 mg Pb kg-1. Based on the changes in heavy metal accumulation in the sediment core, and the calculated the enrichment factor versus depth, these allowed us to understand the historical variability in pollutant linked to past activities in Phuket Bay.
沿海沉积物中的重金属会对人类健康和环境产生不利影响。采用标准、测量和测试计划(简称BCR)提出的前两步顺序萃取法,测定了从泰国普吉岛普吉岛湾采集的21份沉积物样品中Pb和Zn的分布和金属生物利用度。结果表明,Pb在第一馏分(BCR1)中形成弱络合物,占其总浓度(1.7 ~ 7.5 mg kg-1)的11.2% ~ 33%,而Zn在BCR1馏分中的含量为4.9% ~ 9.9%。结果表明,Pb容易进入食物链,其污染的主要原因与当地的人为活动和城市化影响有关,如渡轮码头、船坞和其他海上活动。同时,金属的富集因子表现为轻度到中度重度富集。沿沉积物剖面的金属浓度-深度关系表明,沉积物岩心各层金属浓度在45.4 ~ 88 mg Zn kg-1和12.7 ~ 44.5 mg Pb kg-1之间。根据沉积物岩心中重金属积累的变化,以及计算出的富集因子随深度的变化,我们可以了解普吉湾过去活动相关污染物的历史变化。
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引用次数: 0
Ecological and Human Health Risk Assessment of Heavy Metals by Consuming the Aquatic Plant Species Near an Electronic Waste Open Dumpsite in Thailand 泰国某电子垃圾露天垃圾场附近水生植物对重金属生态和人体健康的风险评价
Q3 Environmental Science Pub Date : 2022-06-27 DOI: 10.35762/aer.2022.44.2.7
Thitima Parkpoom, Somsak Intamat, Uraiwan Phoonaploy, L. Neeratanaphan
Heavy metals from electronic waste (e-waste) accumulate in the environment and can affect human health. The purpose of this study was to determine As, Cd, Cr and Pb concentrations in water, sediment and three species of edible aquatic plants (Ottelia alismoides, Ipomoea aquatic and Marsilea crenata) near an e-waste open dumpsite. Samples were collected from six sampling points surrounding an e-waste open dumpsite and heavy metal concentrations were analyzed by inductively coupled plasma optical emission spectrometry (ICP-OES). Bioaccumulation factors (BAFs), estimated daily intake (EDI), hazard quotient (HQ), hazard index (HI) and carcinogenic risk (CR) were evaluated in the plants. The Pb concentration in the water samples exceeded the quality standard. The order of the heavy metal concentrations in the sediment was Pb>Cr>As >Cd, and these concentrations were within the limits of the quality standard. The order of the heavy metal concentrations in O. alismoides, I. aquatic and M. crenata was Cr>Pb>As>Cd, Pb>Cr>As>Cd and Pb>Cr>As>Cd, respectively. The concentrations of As, Cd, Cr and Pb in O. alismoides and As, Cr and Pb in I. aquatic and M. crenata exceeded the quality standard of food consumption. Most of the BAF values of the heavy metals in O. alismoides were more than one, but in I. aquatic and M. crenata, they were less than one. The order of the EDI values in O. alismoides, I. aquatic and M. crenata was Cr>Pb>As>Cd, Pb>Cr>As>Cd and Cr>As>Pb >Cd, respectively. The HQ values were greater than one for As, Cd and Pb in O. alismoides; Pb in I. aquatic; and As and Pb in M. crenata. The HQ and CR values show that the consumption of edible plants from an e-waste open dumpsite is a human health risk.
来自电子废物(电子废物)的重金属在环境中积累,并可能影响人类健康。本研究旨在测定某电子垃圾露天垃圾场附近水体、沉积物及3种可食性水生植物(水草、水草和马尾草)中砷、镉、铬和铅的含量。采用电感耦合等离子体发射光谱法(ICP-OES)对电子垃圾露天垃圾场周围的6个采样点进行了重金属浓度分析。对植物的生物积累因子(BAFs)、估计日摄入量(EDI)、危害商(HQ)、危害指数(HI)和致癌风险(CR)进行了评价。水样中铅浓度超标。沉积物中重金属含量顺序为Pb>Cr>As >Cd,均在质量标准范围内。水草、水草和水草的重金属浓度顺序分别为Cr>Pb>As>Cd、Pb>Cr>As>Cd和Pb>Cr>As>Cd。水藻中As、Cd、Cr、Pb含量超标,水藻和绿齿藻中As、Cr、Pb含量超标。在水生水蚤和绿腹水蚤中,重金属BAF值大多大于1,而在水生水蚤和绿腹水蚤中则小于1。绿豆、水草和绿腹草的EDI值依次为Cr>Pb>As>Cd、Pb>Cr>As>Cd和Cr>As>Pb >Cd。As、Cd、Pb的HQ值均大于1;水生植物中的铅;绿藻中的砷和铅。HQ和CR值表明,食用来自露天电子垃圾垃圾场的可食用植物对人体健康有风险。
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引用次数: 0
Prediction of Groundwater Quality Index in the Selected Divisions of Srikakulam Using Artificial Neural Networks Approach 用人工神经网络方法预测斯里卡库拉姆流域地下水水质指标
Q3 Environmental Science Pub Date : 2022-06-14 DOI: 10.35762/aer.2022.44.2.5
Santhosh Kumar Nadikatla, Mushini Venkata SubbaRao, M. Krishna
Applicability of artificial neural network (ANN) modelling in predicting the water quality index (WQI) and in turn to ascertain the suitability of the water for human consumption has been presented in the paper. In the light of the present study, seventy-nine (79) groundwater samples were collected from two mandals (divisions) Veeraghattam (VGT) and Palakonda (PLKD) and analyzed for physicochemical parameters during the pre-monsoon and post-monsoon seasons of 2015 and 2016. In computing the WQI, physicochemical parameters such as pH, EC, TDS, TH, Ca, Mg, chlorine, fluoride, nitrite, DO and TA have been considered. From the results it was found that the WQI varies from 43.9 to 46.5 and 31.4 to 34.7 in VGT and PLKD divisions respectively. ANN tool in MATLAB has been used to predict the WQI. Back propagation methodology and LM algorithm has been chosen for the study. To train the network, physicochemical parameters have been given as inputs and the already computed WQI values as output. A particular season has been chosen for testing the network. After simulating the network, the results obtained were compared with the experimental value and found to have an error of 0.6%. It is inferred that the chosen model fits apt for the prediction of WQI in the present study.
本文介绍了人工神经网络(ANN)模型在预测水质指数(WQI)从而确定水是否适合人类饮用方面的适用性。根据本研究,在2015年和2016年季风前和季风后季节,从两个mandals(地区)Veeraghattam (VGT)和Palakonda (PLKD)收集了79份地下水样本,并对其物理化学参数进行了分析。在计算WQI时,考虑了pH、EC、TDS、TH、Ca、Mg、氯、氟、亚硝酸盐、DO和TA等理化参数。结果显示,VGT组和PLKD组的WQI分别为43.9 ~ 46.5和31.4 ~ 34.7。利用MATLAB中的人工神经网络工具对WQI进行预测。本文选择了反向传播方法和LM算法进行研究。为了训练网络,将物理化学参数作为输入,并将已经计算出的WQI值作为输出。选择了一个特定的季节来测试网络。在对网络进行模拟后,将所得结果与实验值进行比较,误差为0.6%。结果表明,所选择的模型适合于本研究对WQI的预测。
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引用次数: 0
Groundwater Quality Assessment Using Groundwater Quality Index and Multivariate Statistical Methods and Human Health Risk Assessment in a Coastal Region of the Vietnamese Mekong Delta 基于地下水质量指数和多元统计方法的越南湄公河三角洲沿海地区地下水质量评价及人类健康风险评价
Q3 Environmental Science Pub Date : 2022-06-14 DOI: 10.35762/aer.2022.44.2.6
Nguyen Thanh Giao, Phan Kim Anh, Huynh Thi Hong Nhien
This study aimed to evaluate the suitability of groundwater for drinking purposes and assess the associated human health risks for different age groups in a coastal province of Mekong Delta, Vietnam. Twenty groundwater samples were collected in Soc Trang Province, and various water quality parameters were analyzed. The data were employed to calculate entropy-weighted groundwater quality index (EWQI), principal component analysis (PCA), cluster analysis (CA), and non-carcinogenic and carcinogenic risks for adult and children health. The results revealed that groundwater in some locations, especially in GW19, was polluted by hardness, total dissolved solids, NH4+, Cl-, Fe, total coliform, and E. coli. In addition, 5 principal components from the PCA results could explain 84.5% of the total variation of groundwater quality, which also suggested that the potential groundwater pollution sources were geochemical processes, agricultural activities, domestic and industrial wastewater, seawater intrusion, and excessive nitrogen fertilizer application. The CA results showed that monitoring locations can be divided into 4 clusters based on their similarities in groundwater quality, and the most polluted group was found at cluster IV (GW19). The computed EWQI values ranged from 20.05 to 738.52, with approximately 45% of total samples classifying good to excellent water quality. The sampling points with undrinkable quality are mainly located in the northeast and center of the province. The ratio of children and adults under the threat of adverse health effects due to drinking groundwater contained non-carcinogenic substances (NH4+, NO2-, NO3-, Cd, Cu, F-, Mn, and As) ranged from 5 to 40%, and children had higher risks compared to adults. Additionally, the consumption of As-contaminated groundwater also poses carcinogenic risks for children, female and male adults ranging from 4.80×10-6 to 1.33×10-4. The findings of this study can provide helpful information for policymakers in the development of long-term water management strategies to protect community health.
本研究旨在评估越南湄公河三角洲沿海省份地下水饮用的适宜性,并评估不同年龄组的相关人类健康风险。采集了20个地下水样本,对各水质参数进行了分析。利用数据计算熵加权地下水质量指数(EWQI)、主成分分析(PCA)、聚类分析(CA)以及成人和儿童健康的非致癌性和致癌性风险。结果表明,部分地区(特别是GW19)地下水受到硬度、总溶解固形物、NH4+、Cl-、Fe、总大肠菌群和大肠杆菌的污染。此外,主成分分析结果的5个主成分可以解释84.5%的地下水质量总变化,这也表明地下水污染的潜在来源是地球化学过程、农业活动、生活和工业废水、海水入侵和过量施用氮肥。CA结果表明,根据地下水水质相似性,监测点可分为4个聚类,其中污染最严重的类群为聚类IV (GW19)。所得EWQI值在20.05 ~ 738.52之间,约45%的样本水质为良至优。不宜饮用的采样点主要分布在东北和中部地区。由于饮用含有非致癌物质(NH4+、NO2-、NO3-、Cd、Cu、F-、Mn和As)的地下水而受到不良健康影响威胁的儿童和成人比例在5 - 40%之间,儿童的风险高于成人。此外,饮用受砷污染的地下水也对儿童、女性和男性成人造成致癌风险,范围从4.80×10-6至1.33×10-4。本研究结果可为决策者制定长期水资源管理策略以保护社区健康提供有益信息。
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引用次数: 5
Biochar from Empty Date Fruit Bunch as an Adsorbent to Remove Eriochrome Black T and Methylene Blue from Aqueous Solution 用空枣串生物炭作为吸附剂去除水中的铬黑T和亚甲基蓝
Q3 Environmental Science Pub Date : 2022-05-13 DOI: 10.35762/aer.2022.44.2.4
Houari Bella, Hayet Bendaikha
Date fruit has a significant role in Sahara countries' economies. In this study, a bunch of empty dates waste was used to produce biochar, which will be used to adsorb Eriochrome black T (EBT) and methylene blue (MB) dyes from aqueous solution. The dates bunch was washed, dried, and ground into small particles. Then it was heated in a muffle furnace at 850 °C. The biochar from empty date bunches (BEDB) characteristics before and after adsorption was determined by using scanning electron microscopy (SEM) and Fourier transform infrared (FTIR) spectroscopy. The experiment has used different parameters notably initial concentration (25 – 100 mg L-1), contact time (0 – 90 min), BEDB amount (0.01 – 0.05 g), and different solutions pH (2 – 10) in batch adsorption. This investigation has shown that Langmuir and pseudo-second-order isotherm models were well-fitted than Freundlich and pseudo-first-order. The maximum capacity of adsorption was 58.47 and 80.64 mg g-1 for EBT and MB removal, respectively at 25°C. The results obtained show that BEDB sorbent has an important adsorption capacity of dyes removal and has a performance to eliminate EBT and MB dyes from aqueous solution.
枣在撒哈拉国家的经济中扮演着重要的角色。本研究利用一堆空枣渣制备生物炭,用于吸附水溶液中的eriochromeblack T (EBT)和亚甲基蓝(MB)染料。枣束洗净,晒干,磨成小颗粒。然后在马弗炉中加热到850°C。利用扫描电子显微镜(SEM)和傅里叶变换红外光谱(FTIR)对吸附前后的生物炭进行了表征。实验采用初始浓度(25 ~ 100 mg L-1)、接触时间(0 ~ 90 min)、BEDB用量(0.01 ~ 0.05 g)和不同溶液pH(2 ~ 10)进行间歇吸附。研究表明,Langmuir和伪二阶等温线模型比Freundlich和伪一阶模型拟合得更好。在25℃条件下,EBT和MB的最大吸附量分别为58.47和80.64 mg g-1。结果表明,BEDB吸附剂具有重要的染料去除能力,对EBT和MB染料有较好的去除效果。
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引用次数: 0
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Applied Environmental Research
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