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Evaluation of the toxicity of textile effluent treated by electrocoagulation 电絮凝法处理纺织废水毒性评价
IF 1.6 Q3 Environmental Science Pub Date : 2023-04-06 DOI: 10.2166/wpt.2023.049
Jéssica Martins, Eliezer Fares Abdala Neto, J. P. Ribeiro, A. Lima, F. W. Sousa, A. G. Oliveira, C. Vidal, R. Nascimento
Textile effluents are complex, making it difficult to choose an effective treatment. The textile effluent toxicity in Lactuca sativa after pulsed current (PC) electrocoagulation (EC) was evaluated in this study. The EC was performed using 304 stainless steel electrodes in batch mode. Parameters monitored included pH, temperature, color, and turbidity. Additionally, the process residue was subjected to energy-dispersive X-ray fluorescence (XFR) to determine the elements present. The process achieved proportional color and turbidity removal ranging from 97 to 99% and from 74 to 85%, respectively. Chemical oxygen demand (COD) and total nitrogen removal were 81 and 49%, respectively, in a 50 min time-lapse. The process generated approximately 1.7 kg of solid residue/m3 treated effluent. The XFR results revealed the presence, mainly, of Fe, Cr, and Ni ions in the residue, as well as chlorine. The germination index (GI) and relative growth values showed that EC reduced effluent toxicity slightly, indicating the need for complementary treatment.
纺织废水很复杂,很难选择有效的处理方法。本研究评价了脉冲电流(PC)电凝聚(EC)对莴苣织物废水的毒性。EC是在分批模式下使用304不锈钢电极进行的。监测的参数包括pH、温度、颜色和浊度。此外,对工艺残留物进行能量色散X射线荧光(XFR)以测定存在的元素。该工艺实现了色度和浊度的比例去除,去除率分别为97至99%和74至85%。在50分钟的时间推移内,化学需氧量(COD)和总氮去除率分别为81%和49%。该工艺产生了约1.7千克固体残渣/m3处理过的流出物。XFR结果显示残留物中主要存在Fe、Cr和Ni离子以及氯。发芽指数(GI)和相对生长值显示EC略微降低了出水毒性,表明需要补充处理。
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引用次数: 0
Characterizing groundwater quality for a safe supply of water using WQI and GIS in Bahir Dar city, northwest Ethiopia 在埃塞俄比亚西北部的巴希尔达尔市,利用WQI和GIS分析地下水质量,以确保安全供水
IF 1.6 Q3 Environmental Science Pub Date : 2023-04-05 DOI: 10.2166/wpt.2023.046
Although both urban and rural residents benefit from drinking enough high-quality water in the right amounts, the degree of contamination from artificial sources has been increasing. The study aims to assess the quality and availability of groundwater potential in Bahir Dar City using geographic information systems (GIS)-based ordinary kriging (OK) and analytical hierarchy process methods, respectively. The concentrations of pH, alkalinity, Escherichia coli, nitrite manganese, and iron in the groundwater of built-up areas were found to exceed the limits set by the World Health Organization. The groundwater quality distribution contained 69.6% of good water, 19.6% of the excellent class, and 10.8% of the poor class. The high potential of groundwater, particularly in the Lake Tana shoreline sedimentation areas, revealed the poor quality class. The results suggest that improving groundwater quality should be prioritized in areas with high potential groundwater availability.
尽管城市和农村居民都能从适量饮用足够高质量的水中受益,但人工水源的污染程度一直在增加。本研究旨在分别使用基于地理信息系统(GIS)的普通克里格法和层次分析法评估巴希尔达尔市地下水潜力的质量和可用性。建成区地下水中的pH、碱度、大肠杆菌、亚硝酸盐、锰和铁的浓度超过了世界卫生组织规定的限值。地下水水质分布包括69.6%的良水、19.6%的优水和10.8%的劣水。地下水的高潜力,特别是在塔纳湖海岸线沉积区,显示出水质较差。研究结果表明,在地下水可利用性高的地区,应优先改善地下水质量。
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引用次数: 0
Treating and reusing polluted runoff from an informal settlement, South Africa 处理和再利用来自一个非正式定居点的污染径流,南非
IF 1.6 Q3 Environmental Science Pub Date : 2023-04-03 DOI: 10.2166/wpt.2023.045
K. Winter, S. Mgese, Emily Nicklin, Kalpana Maraj
Biofiltration holds one of the most promising options for removing environmental pollutants from water by reducing inorganic matter, and nutrient concentrations and removing pathogens. This study evaluates the performance of six large field-scale biofiltration cells and assesses the risk of reusing this treated water for irrigating food gardens. The study took place at an abandoned wastewater treatment work (WWTW) in Franschhoek, South Africa. A batch operation was used to measure physical water properties and nutrient concentrations. Large stone cells performed best in reducing ammonia nitrogen (NH3) and orthophosphate (PO43-) by 98 and 95%, respectively, however, an overall increase in nitrate (NO3-) and nitrites (NO2-) was also observed in these and other cells. Phytoremediation made a marginal contribution to reducing contamination. The extent to which biofiltration can be used to clean and reuse contaminated surface water runoff from an informal settlement to safely reuse the water for irrigation purposes is poorly understood. Laboratory analyses revealed that the water quality from four successive harvests broadly met South African guidelines for irrigation and compared favourably with the quality of vegetables from local supermarkets.
生物过滤是通过减少无机物、营养物浓度和去除病原体来去除水中环境污染物的最有希望的选择之一。本研究评估了六个大型野外生物过滤细胞的性能,并评估了将这些处理过的水重新用于灌溉菜园的风险。这项研究在南非Franschhoek的一个废弃废水处理厂(WWTW)进行。间歇式操作用于测量水的物理性质和营养物质浓度。大石细胞对氨氮(NH3)和正磷酸盐(PO43-)的还原效果最好,分别为98%和95%,但在这些细胞和其他细胞中也观察到硝酸盐(NO3-)和亚硝酸盐(NO2-)的总体增加。植物修复对减少污染的贡献很小。生物过滤在多大程度上可以用于清洁和再利用来自非正式住区的污染地表水径流,以安全地将水重新用于灌溉目的,人们知之甚少。实验室分析表明,连续四次收获的水质基本符合南非的灌溉准则,与当地超市的蔬菜质量相比也很好。
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引用次数: 1
Evaluation of nature-based solutions for flood risk management in the Oitavén-Verdugo River Basin (NW Spain) oitav<s:1> - verdugo河流域(西班牙西北部)基于自然的洪水风险管理解决方案评价
IF 1.6 Q3 Environmental Science Pub Date : 2023-03-28 DOI: 10.2166/wpt.2023.043
Carolina Acuña Alonso, Lucia Martínez Portabales, Enrique Valero, X. Álvarez
Floods are recurrent phenomena with significant environmental and socio-economic impacts. The risk of flooding can increase when land use changes. The objective of this research has been to obtain an integrative methodology based on the development of a model in HEC-HMS, calibrated and validated from events between 2018 and 2022, and to apply simulations employing the use of Nature-Based Solutions (NbS) tools. This model has been applied in Verdugo-Oitavén River Basin (NW Spain). Three different scenarios propose (1) the reforestation of 30% of abandoned agricultural land across the basin, (2) reforestation upstream (S-Upstream), and (3) reforestation in two sub-basins (S-Downstream). Upstream afforestation provided a similar reduction to catchment-wide afforestation for both peak discharge and hydrograph volumes. The S-Upstream simulation reaches peak reductions of 8%, but this percentage decreases when precipitation events are long lasting, reaching a reduction of 3.3% for events of 5 days or more. On the other hand, downstream reforestation has minimal effect (1%) in reducing maximum discharge of events. The use of NbS-based strategies would improve integrated watershed management, reduce flood risk, and improve environmental governance.
洪水是经常发生的现象,具有重大的环境和社会经济影响。当土地利用发生变化时,洪水的风险会增加。本研究的目的是在HEC-HMS模型开发的基础上获得一种综合方法,该方法从2018年至2022年的事件中进行校准和验证,并使用基于自然的解决方案(NbS)工具进行模拟。该模型已在verdugo - oitavsamin河流域(西班牙西北部)应用。三种不同的情景建议:(1)整个流域30%的废弃农业用地的再造林,(2)上游(s -上游)的再造林,(3)两个子流域(s -下游)的再造林。上游造林对流域造林的峰值流量和水文量都有类似的减少。S-Upstream模拟达到峰值减少8%,但当降水事件持续时间较长时,这一百分比下降,5天或更长时间的事件减少3.3%。另一方面,下游再造林对减少最大排放事件的影响最小(1%)。使用基于国家统计局的战略将改善流域综合管理,降低洪水风险,改善环境治理。
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引用次数: 0
Manning's roughness coefficient in a truncated triangular open-channel flow section 截断三角形明渠断面的曼宁粗糙度系数
IF 1.6 Q3 Environmental Science Pub Date : 2023-03-28 DOI: 10.2166/wpt.2023.044
Sehtal Sabah, Achour Bachir
In uniform flows, Manning's roughness coefficient n plays an important role in the calculation of the normal depth in the open channels. When calculating uniform flows in open conduits and channels, Manning's coefficient is arbitrarily chosen. This arbitrary choice is not physically justified because the coefficient n must be determined according to the parameters that influence the flow, particularly the normal depth sought. In this paper, a new method is presented to compute Manning's coefficient in a truncated triangular channel section. In the first step, the study proposes to establish the general relationship that allows computing Manning's coefficient in this type of channel. The relationship is presented in dimensionless terms, giving it a character of general validity, including the dimensionless Manning's resistance coefficient, denoted as N. The latter is shown to depend on the aspect ratio of the wetted area, the side slope of the channel, the relative roughness and the modified Reynolds number, which is physically justified since flow resistance is closely related to flow depth. In the second step, the rough model method is proposed to express Manning's coefficient when the horizontal dimension of the channel is not a given data of the problem.
在均匀流动中,曼宁粗糙度系数n在明渠法向深度的计算中起着重要作用。在计算明渠均匀流量时,曼宁系数是任意选择的。这种任意选择在物理上是不合理的,因为系数n必须根据影响流动的参数确定,特别是所寻求的正常深度。本文提出了一种计算截断三角形通道截面曼宁系数的新方法。在第一步,研究建议建立一般关系,允许在这种类型的通道中计算曼宁系数。该关系以无量纲形式呈现,使其具有普遍有效性,包括无量纲曼宁阻力系数,表示为n,后者取决于湿区长径比,通道的边坡,相对粗糙度和修正雷诺数,这在物理上是合理的,因为流动阻力与流动深度密切相关。第二步,提出了当通道的水平尺寸不是问题的给定数据时,用粗糙模型方法表示曼宁系数。
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引用次数: 0
Synthesis of activated carbon from banana peels for dye removal of an aqueous solution in textile industries: optimization, kinetics, and isotherm aspects 用香蕉皮合成活性炭去除纺织工业中染料的水溶液:优化,动力学和等温线方面
IF 1.6 Q3 Environmental Science Pub Date : 2023-03-27 DOI: 10.2166/wpt.2023.042
Talbachew Tadesse Nadew, Mestawot Keana, Tsegaye Sisay, Belay Getye
Treatment of harmful chemicals using materials at our disposal is the way forward to be. This study presents the activation of waste banana peels and the investigation of the bio-adsorption potential for dye removal from an aqueous solution. The banana peel was activated both thermally and chemically by a preliminary study of a 0.5–2.5 M of sulfuric acid concentration, and 50–90 °C of temperature for 1–5 h of activation time. Activation at 1.5 M of acid concentration, at 70 °C for 3 h showed a promising efficacy of about 90% of dye removal. The activated banana peel was characterized by proximate analysis, BET, TGA, SEM, XRD, and FTIR. BET results showed activated banana peels to be porous materials with a surface area of 302 m2/g. The capacity of the adsorbent with different variable ranges (adsorption time 20–140 min, pH 1.0–7.0, adsorbent dose 1–4 g/L and initial dye concentration 20–80 mg/L) was conducted based on a preliminary study. The adsorption process was optimized numerically and the results were the following: adsorption time of 60 min, pH 3, adsorbent dose of 2 g/L and an initial dye concentration of 40 mg/L. In the adsorption study, the pseudo-second-order kinetics model and Langmuir isotherm model were the best fit to describe the adsorption process.
使用我们可处理的材料处理有害化学物质是未来的发展方向。本研究介绍了废香蕉皮的活化和从水溶液中去除染料的生物吸附潜力的研究。通过对0.5–2.5 M硫酸浓度和50–90°C温度下1–5小时活化时间的初步研究,对香蕉皮进行了热活化和化学活化。在1.5 M的酸浓度下,在70°C下活化3小时,显示出约90%的染料去除效果。通过近红外光谱、BET、TGA、SEM、XRD、FTIR等测试手段对活性香蕉皮进行了表征。BET结果显示活化的香蕉皮是表面积为302m2/g的多孔材料。在初步研究的基础上,对不同可变范围(吸附时间20–140分钟,pH 1.0–7.0,吸附剂剂量1–4 g/L和初始染料浓度20–80 mg/L)的吸附剂容量进行了研究。对吸附过程进行了数值优化,结果表明:吸附时间为60min,pH值为3,吸附剂用量为2g/L,染料初始浓度为40mg/L。在吸附研究中,拟二阶动力学模型和Langmuir等温线模型最适合描述吸附过程。
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引用次数: 1
Artemisia stelleriana-mediated ZnO nanoparticles for textile dye treatment: a green and sustainable approach 紫花蒿介导的氧化锌纳米颗粒用于纺织染料处理:一种绿色和可持续的方法
IF 1.6 Q3 Environmental Science Pub Date : 2023-03-27 DOI: 10.2166/wpt.2023.041
Juhi Puthukulangara Jaison, Joseph Kadanthottu Sebastian
Textile effluents being one of the major reasons for water pollution raises major concern for water bodies and the habitation surrounding them. The lack of biologically safer treatment solutions creates a major concern for the disposal of these effluents. The present study focuses on the degradation of textile dyes using leaf extract of Artemisia stelleriana-assisted nanoparticles of zinc oxide (ZnO-NPs). Nanoparticles of zinc oxide (ZnO-NPs) synthesized were confirmed using spectroscopic, X-ray diffraction and microscopic analysis. The current research utilizes widely used major textile dyes, Reactive Yellow-145 (RY-145), Reactive Red-120 (RR-120), Reactive Blue-220 (RB-220) and Reactive Blue-222A (RB-222A), which are released accidentally or due to the non-availability of cost-efficient, dependable and environment-friendly degradation methods, making this work a much-needed one for preventing the discharge before treatment. The biosynthesized ZnO-NPs were top-notch catalysts for the reduction of these dyes, which is witnessed by a gradual decrease in absorbance maximum values. After 320 min, ZnO-NPs under UV light exposure showed 99, 95, 94 and 45% degradations of RY-145, RR-120, RB-220 and RB-222A dyes, respectively. The phytotoxicity study conducted at two trophic levels revealed that the A. stellariana-mediated ZnO-NPs have great potential for the degradation of textile dyes, allowing them to be scaled up to large-scale treatments.
纺织废水是水体污染的主要原因之一,引起了水体及其周围居民的严重关注。缺乏更安全的生物处理方法是这些废水处理的一个主要问题。本文研究了利用星形蒿叶提取物辅助氧化锌纳米颗粒(ZnO-NPs)降解纺织染料的方法。利用光谱学、x射线衍射和显微分析对合成的纳米氧化锌(ZnO-NPs)进行了确证。本研究利用了目前广泛使用的主要纺织染料,活性黄-145 (RY-145)、活性红-120 (RR-120)、活性蓝-220 (RB-220)和活性蓝- 222a (RB-222A),这些染料是偶然或由于缺乏经济、可靠和环保的降解方法而释放的,因此在处理前防止排放是非常必要的。生物合成的ZnO-NPs是还原这些染料的最佳催化剂,其吸光度最大值逐渐降低。紫外线照射320 min后,ZnO-NPs对RY-145、RR-120、RB-220和RB-222A染料的降解率分别为99%、95%、94%和45%。在两个营养水平上进行的植物毒性研究表明,黄芪介导的ZnO-NPs具有降解纺织染料的巨大潜力,可以大规模处理。
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引用次数: 1
Assessment of a hybrid technology for liquid fuel dimethyl aminoethyl azide wastewater treatment 混合工艺处理液体燃料二甲基氨基乙基叠氮化物废水的评价
IF 1.6 Q3 Environmental Science Pub Date : 2023-03-23 DOI: 10.2166/wpt.2023.040
Mohadeseh Aqaei, S. Pakdehi
Dimethyl aminoethyl azide (DMAZ) is a liquid fuel in the space industry. Although this fuel is non-carcinogenic, its wastewater suffers from some hazardous pollutants, such as sodium azide (NaN3). A hybrid process of coagulation–flocculation and chemical reaction with nitrous acid was applied for the wastewater treatment. The Taguchi method was used for the process optimization. Coagulant concentration, rapid mixing intensity, duration time, CAMP number and settlement time were found to be effective parameters for the efficiency of the former process. Turbidity and total suspended solids (TSS) of the wastewater were used to track the removal efficiency in the first stage. The complete removal efficiency was achieved. In the latter process, NaN3 was removed using a reaction with nitrous acid. pH of the wastewater was optimized as the controlling factor in the second process. Biochemical oxygen demand (BOD), chemical oxygen demand (COD) and NaN3 removals of 98.9, 98.2 and 96.3% were obtained under the optimum conditions, respectively. As a result, a reduction of 91.9% in turbidity, 98.5% in TSS, 98.5% in BOD, 98.1% in COD and 96.7% in NaN3 concentration were observed in the output of the wastewater.
二甲基氨基乙基叠氮化物(DMAZ)是航天工业中的一种液体燃料。尽管这种燃料不致癌,但其废水中含有一些危险污染物,如叠氮化钠(NaN3)。采用混凝-絮凝-亚硝酸化学反应的混合工艺处理污水。采用田口法进行工艺优化。混凝剂浓度、快速混合强度、持续时间、CAMP数和沉降时间是影响前一工艺效率的有效参数。利用污水的浊度和总悬浮固体(TSS)来跟踪第一阶段的去除效率。达到了完全的去除效率。在后一种方法中,使用与亚硝酸的反应去除NaN3。在第二步工艺中,以废水的pH值为控制因素进行了优化。在最佳条件下,生化需氧量(BOD)、化学需氧量(COD)和NaN3的去除率分别为98.9%、98.2%和96.3%。结果,废水的浊度降低了91.9%,TSS降低了98.5%,BOD降低了98%,COD降低了98.1%,NaN3浓度降低了96.7%。
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引用次数: 0
Trophic classification and assessment of lake health using indexing approach and geostatistical methods for sustainable management of water resources 基于指数法和地统计学方法的湖泊健康营养分类与评价
IF 1.6 Q3 Environmental Science Pub Date : 2023-03-22 DOI: 10.2166/wpt.2023.039
Nilabhra Auddy, A. Rai, S. Chatterjee, K. Pobi, S. Dutta, S. Nayek
This study aims to analyse the spatio-temporal trends in water quality, trophic state, and organic contamination of an alpine lake in the Darjeeling Himalaya through field investigations and to portray a comprehensive picture using multivariate analysis. Analysed water parameters have shown notable seasonal variations and were within the acceptable range for inland surface water. Water quality index (WQI) and organic pollution index (OPI) values have displayed ‘poor’ to ‘heavily polluted’ status in the pre-monsoon season, with marginally better conditions during the post-monsoon studies. Trophic state indices (TSIs) values revealed ‘eutrophic to highly eutrophic’ conditions during the investigation period. The results of the PCA have depicted three major determining factors (i.e., anthropogenic contribution, geogenic or weathering, and seasonal/climatic factors) that control the overall pollution level in the lake water system. The current study can potentially be a benchmark for assessing and undertaking management and restoration measures for this nascent alpine ecosystem.
本研究通过实地调查,分析了该地区高寒湖泊的水质、营养状况和有机污染的时空变化趋势,并采用多变量分析方法对其进行了综合分析。经分析的水参数显示出显著的季节变化,在内陆地表水可接受的范围内。在季风前,水质指数(WQI)和有机污染指数(OPI)值显示出“差”到“严重污染”的状态,在季风后的研究中,情况略有好转。在调查期间,营养状态指数(tsi)值显示为“富营养化到高度富营养化”状态。主成分分析的结果描述了控制湖泊水系统整体污染水平的三个主要决定因素(即人为贡献、地质或风化以及季节/气候因素)。目前的研究有可能成为评估和实施这一新生高山生态系统管理和恢复措施的基准。
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引用次数: 0
A new bacterial-derived biosurfactant for biotechnological applications in the oil industry: production, optimization, biosurfactant functional and physicochemical characterization 一种用于石油工业生物技术的新型细菌衍生生物表面活性剂:生产、优化、生物表面活性剂的功能和理化特性
IF 1.6 Q3 Environmental Science Pub Date : 2023-03-20 DOI: 10.2166/wpt.2023.036
Marwa Elghoul, Mouna Bouassida, D. Ghribi, Mnif Inès
Aiming at the potential application of lipopeptide biosurfactant (BioS) in bioremediation, we studied its production by a novel, isolated strain of Bacillus sp. MI27. Using the experimental design methodology, a sucrose-based medium composed of 2% sucrose, 0.27% Na2HPO4, 0.2% ammonium sulfate, 0.02% NaCl, 0.02% CaCl2, 0.02% MgSO4, 0.001% MnSO4, 0.06% KH2PO4, 0.005% FeSO4 and 0.005% ZnSO4 was optimized. With this composition, strain MI27 produces 1.4 g/L with maximum surface tension (ST) reduction of 23 mN/m and a dispersion diameter of around 10 cm. Emulsifying and foaming activities have been also confirmed. The critical micelle concentration (CMC) value of about 120 mg/L with a maximal decrease of ST of 23 mN/m with a maximum dispersion and an emulsification index (EI) of about 12 cm and 45% at 1,000 mg/L. Moreover, the foaming capacity is about 80% at 1,000 mg/L stable over 1 h of incubation. Additionally, we studied the effect of different values of pH, temperature and salinities on MI27 BioS activity and stability. Obtained results showed interesting surface activities at extreme physicochemical conditions, especially at acidic and alkaline pH values, high and low temperatures and higher salinities. All these characteristics enable the possible application of BioS in water treatment biotechnology under diverse environmental conditions.
针对脂肽类生物表面活性剂(BioS)在生物修复中的潜在应用,研究了一株分离的芽孢杆菌MI27在生物修复中的应用。采用实验设计方法,优化了由2%蔗糖、0.27% Na2HPO4、0.2%硫酸铵、0.02% NaCl、0.02% CaCl2、0.02% MgSO4、0.001% MnSO4、0.06% KH2PO4、0.005% FeSO4和0.005% ZnSO4组成的蔗糖基培养基。使用这种成分,应变MI27产生1.4 g/L,最大表面张力(ST)降低23 mN/m,分散直径约为10 cm。乳化和发泡活性也得到了证实。临界胶束浓度(CMC)约为120 mg/L,最大ST降低23 mN/m,最大分散性和乳化指数(EI)约为12 cm和45%。在1000 mg/L条件下稳定孵育1 h,起泡率约为80%。此外,我们还研究了不同pH值、温度和盐度对MI27 BioS活性和稳定性的影响。结果表明,在极端物理化学条件下,特别是在酸性和碱性、高低温和高盐度条件下,其表面活性非常有趣。这些特点使生物化学在不同环境条件下的水处理生物技术应用成为可能。
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引用次数: 0
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