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A Combined Approach for the Treatment of Textile Dye Bath Effluent Using CO2 Gas CO2气体联合处理纺织染料浴废水的研究
IF 0.5 Q4 ENVIRONMENTAL SCIENCES Pub Date : 2023-03-29 DOI: 10.3233/ajw230025
Venkatesan Govindaraj, Kalpana Manoharan, S. Sakthivel, K. Guruchandran, W. Mathew
In this study, baking soda extraction from textile dye bath effluent has been investigated. The novel notion of employing amino acid additions to improve the standard Solvay method and thereby boost the efficiency of Na+ recovery has been investigated. Glycine, L-arginine, and L-alanine are three amino acid additions examined for their effect on enhancing Na+ recovery, and the best-suited additive is chosen. The dumping of brackish dye bath effluent, which has a high percentage of sodium chloride, causes textile dye baths from the textile industry. The primary goal was to remove Na+ (sodium) from the effluent using carbon dioxide gas, which has environmental benefits. Carbon dioxide (CO2) is the most common greenhouse gas, trapping heat and raising global temperatures, therefore contributing to climate change. The Solvay process is used to transform Na+ in salty wastewater into a valuable product. The effect of different operating variables such as NH4OH (ammonium hydroxide) concentration, reaction temperature, carbonation time, and carbon dioxide gas flow rate on bicarbonate production was investigated. Maximum sodium recovery of about 68 percent is attained under optimal circumstances. When compared with the regular Solvay process, the modified Solvay method has a greater recovery efficiency (33 percent). Amino acid addition (arginine) improved conversion efficiency while also lowering the process’s ammonia need.
本文研究了从纺织染料浴废水中提取小苏打的方法。研究了使用氨基酸添加来改进标准索尔维方法从而提高Na+回收效率的新概念。甘氨酸、L-精氨酸和L-丙氨酸是三种氨基酸添加剂,考察了它们对提高Na+回收的作用,并选择了最合适的添加剂。含有高百分比氯化钠的微咸染料浴废水的倾倒导致纺织工业的纺织染料浴。主要目标是使用二氧化碳气体从废水中去除Na+(钠),这对环境有益。二氧化碳(CO2)是最常见的温室气体,它会锁住热量并升高全球温度,因此会导致气候变化。索尔维工艺用于将含盐废水中的Na+转化为有价值的产品。研究了NH4OH(氢氧化铵)浓度、反应温度、碳酸化时间和二氧化碳气体流速等不同操作变量对碳酸氢盐生产的影响。在最佳条件下,钠的最大回收率可达到约68%。与常规索尔维法相比,改进的索尔维法具有更高的回收效率(33%)。添加氨基酸(精氨酸)提高了转化效率,同时也降低了该工艺对氨的需求。
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引用次数: 0
Evaluation of the Effects of Riparian Population Activities on the Physicochemical Quality of Water in a Mediterranean River: The Inaouene River (Taza, North East Morocco) 河岸种群活动对地中海河流水体理化质量影响的评价:伊纳瓦内河(摩洛哥东北部塔扎)
IF 0.5 Q4 ENVIRONMENTAL SCIENCES Pub Date : 2023-03-29 DOI: 10.3233/ajw230029
F. E. Sghiouer, A. Nahli, H. Bouka, M. Chlaida
Mediterranean Rivers are often increasingly subjected to stress as a result of riparian population activities. This present study assessed the impact of human activities on the water quality of the Inaouene River in Morocco. For this purpose, water samples were collected from seven sampling stations along the River and analysed. The water of the Inaouene River is characterised by slightly alkaline water pH (7.32-7.59), electrical conductivity (1206.44-3674.14 μS cm-1), very low level of dissolved oxygen (1.98-5.55 mg L-1), BOD5 (45.42-328.7 mg L-1), COD (112.71-468.46 mg L-1). The results classify the Inaouene River’s water in the “moderate to poor” quality range based on Moroccan standards. This water, which is characterised by moderate to severe organic contamination, is also distinguished by a significant allochthone charge from the different riparian urban centres. The multivariate analysis showed a decline in water quality and high amounts of organic matter, nitrogenous and phosphorus in urban centres downstream. Waters from stations located further away from domestic discharge points are less polluted and more oxygenated. Overall, these findings confirmed that the combined effect of anthropogenic activities and the seasonality characteristic of the Inaouene watershed is the main factor that determines water quality.
由于河岸人口活动,地中海河流往往越来越受到压力。本研究评估了人类活动对摩洛哥伊纳乌内河水质的影响。为此,从沿河的七个采样站采集了水样并进行了分析。Inaouene河的水具有微碱性,pH值(7.32-7.59),电导率(1206.44-3674.14μS cm-1),溶解氧水平极低(1.98-5.55 mg L-1),BOD5(45.42-328.7 mg L-1。根据摩洛哥标准,结果将伊纳乌内河的水质划分为“中等至较差”。这种水以中度至重度有机污染为特征,也因不同河岸城市中心的大量外来石电荷而有所不同。多元分析显示,下游城市中心的水质下降,有机质、氮和磷含量高。远离生活排放点的站的水污染较小,含氧量较高。总的来说,这些发现证实了人类活动和Inaouene流域季节性特征的综合影响是决定水质的主要因素。
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引用次数: 0
Estimation of Air Pollutants Along with Meteorological Parameters and Study of Their Impact on Human Health 大气污染物随气象参数的估算及其对人体健康影响的研究
IF 0.5 Q4 ENVIRONMENTAL SCIENCES Pub Date : 2023-03-29 DOI: 10.3233/ajw230027
Mehraj Uddin Bhat, A. C. Pandey, Mohd. Adil Deva
The research studies have shown that air pollution has been well thought-out as the main warning to health globally. It requests the participation of researchers from time to time to address and revive the problem sincerely. In India concentration of air pollutants has become a serious issue. In most Indian cities, the level of air pollutants is above the prescribed level as per the CPCB. Gwalior City of Madhya Pradesh (India) is at the entrance of speedy urbanisation and industrialisation which causes the worsening air quality of the city. As per the reports of 2015, Gwalior is listed among the top polluted city in India. To address this problem an investigation of air pollutant concentration was carried out at three stations in Gwalior. In this study SO2, NO2 and RSPM and SPM were collected over three stations categorised as residential, industrial and commercial and estimation was done by chemical methods. Meteorological parameters like temperature and relative humidity were also recorded during the sampling period. Seasonal variations of these pollutants have been analysed and noted. From the study, the concentrations of the pollutants were observed to be high in summer and winter than in monsoon and post-monsoon seasons. In this study, it was noticed that the RSPM and SPM levels at all selected sites exceed the prescribed limits. While the level of gaseous SO2 and NO2 are observed to remain under prescribed limits. The main objective of this study was to know the quality of air in Gwalior and study its health impacts as the city has been selected as one of the hundred Indian cities that can be developed into a smart city under PM Narendra Modi’s flagship Smart Cities Mission.
研究表明,空气污染被认为是全球健康的主要威胁。它要求研究人员不时参与,真诚地处理和恢复这个问题。在印度,空气污染物的浓度已经成为一个严重的问题。在大多数印度城市,空气污染物水平高于CPCB规定的水平。印度中央邦瓜廖尔市正处于快速城市化和工业化的入口处,这导致了城市空气质量的恶化。根据2015年的报告,瓜廖尔被列为印度污染最严重的城市之一。为了解决这一问题,对瓜廖尔三个站点的空气污染物浓度进行了调查。在本研究中,SO2、NO2、RSPM和SPM分别在住宅、工业和商业三个站点收集,并通过化学方法进行估算。在采样期间,还记录了温度和相对湿度等气象参数。对这些污染物的季节变化进行了分析和记录。研究发现,夏季和冬季的污染物浓度高于季风季节和季风后季节。在这项研究中,我们注意到所有选定地点的RSPM和SPM水平都超过了规定的限值。而二氧化硫和二氧化氮的浓度则保持在规定的限度之内。这项研究的主要目的是了解瓜廖尔的空气质量,并研究其对健康的影响,因为瓜廖尔已被选为印度总理纳伦德拉·莫迪旗舰智慧城市使命下可以发展成为智慧城市的100个印度城市之一。
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引用次数: 0
Editorial 社论
IF 0.5 Q4 ENVIRONMENTAL SCIENCES Pub Date : 2023-01-23 DOI: 10.3233/ajw230001
V. Subramanian
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引用次数: 0
Iraq Green Buildings Code Effect on Improving Outdoor Thermal Comfort for Residential Complex 伊拉克绿色建筑规范对提高住宅综合体室外热舒适性的影响
IF 0.5 Q4 ENVIRONMENTAL SCIENCES Pub Date : 2023-01-23 DOI: 10.3233/ajw230015
Ahmed Kadhim Hado, S. A. Hassan
Iraq is one of the countries facing a noticeable rise in temperatures caused by climate change in recent decades. This generated an increased feeling of thermal discomfort among humans. Previous studies submitted many research works in the field of outdoor thermal comfort in cities, but the study of the role of the Iraqi green buildings code in improving outdoor thermal comfort for the residential complex was not adequately addressed, especially at the local level, which was the research problem. The research proposes that the adoption of Iraq Green Buildings code will increase outdoor thermal comfort in residential complexes. The Bismayah residential complex in Baghdad was chosen for this study and tested with ENVI-MET 4.4.2 software. The simulation is based on PMV assessments performed before and after the green building code was implemented. It was found that the implementation of green buildings code improved by increasing the percentage of vegetation, trees and water bodies. Also the change in façade materials to light colours, and the type of pavement materials. had a significant role in increased (PMV) during the day by about two degrees from the model before the change.
伊拉克是近几十年来气候变化导致气温明显上升的国家之一。这增加了人类的热不适感。以往的研究在城市室外热舒适领域进行了大量的研究工作,但对伊拉克绿色建筑规范在改善住宅综合体室外热舒适方面的作用的研究还不够充分,特别是在地方层面,这是研究的问题。研究表明,采用伊拉克绿色建筑规范将提高住宅小区的室外热舒适性。本研究选择巴格达Bismayah住宅区,并使用ENVI-MET 4.4.2软件进行测试。模拟是基于绿色建筑规范实施前后进行的PMV评估。研究发现,通过增加植被、树木和水体的比例,绿色建筑规范的实施得到了改善。此外,立面材料的浅色变化,以及路面材料的类型。与变化前的模型相比,白天的PMV增加了大约两度。
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引用次数: 0
The Utilisation of International Watercourses from an International Environmental Law Perspective 国际环境法视角下的国际水道利用
IF 0.5 Q4 ENVIRONMENTAL SCIENCES Pub Date : 2023-01-23 DOI: 10.3233/ajw230006
Nanik Trihastuti, P. Hananto, D. Kandou
The international watercourse concept is one of the multilateral commitments to maintain water quality and control the utilisation of water. This concept aims to provide preventive measures for water pollution caused by the international community. With the importance of industrialisation, economic activities and uncontrolled use of water significantly impact water quality being polluted and resulting in reduced water discharge. Problems and conflicts will arise if there is an action from one of the States or the international community that violates international provisions. This research uses the normative legal research method. This study aims to examine and criticise forms of violations against international watercourses and discuss them from a legal perspective related to dispute settlement. The findings show that States must act in a fair and equitable manner in the utilisation of international watercourses, and prevent significant harm. Breaches of such obligations require compensation as a form of responsibility.
国际水道概念是维持水质和控制水的利用的多边承诺之一。这一概念旨在为国际社会造成的水污染提供预防措施。随着工业化的重要性,经济活动和不受控制的用水严重影响水质被污染,导致水排放量减少。如果一个国家或国际社会采取违反国际规定的行动,就会产生问题和冲突。本研究采用规范法学研究方法。这项研究的目的是审查和批评违反国际水道的各种形式,并从与解决争端有关的法律角度加以讨论。调查结果表明,各国必须在利用国际水道方面以公正和公平的方式采取行动,并防止重大损害。违反这些义务需要赔偿,作为一种责任。
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引用次数: 0
Assessment of Seven Conventional Natural Drinking Water Sources in the Periphery of Chamba Town of Himachal Pradesh in India 印度喜马偕尔邦昌巴镇周边7个常规天然饮用水源评价
IF 0.5 Q4 ENVIRONMENTAL SCIENCES Pub Date : 2023-01-23 DOI: 10.3233/ajw230013
T. Singh, H. Pal
Chamba town of Himachal Pradesh in India is renowned for its conventional natural underground drains, springs and well water sources known as Panihar, Nara and Boury in the local dialect. These are the major traditional freshwater sources for human consumption in the valley. Water is one of the most essential natural sources required for the survival of human beings. But the quality of water in these natural sources is deteriorating day by day due to the universal impact of climate change and the increasing pollutant load of unplanned human activities. The deterioration of natural water sources is a major concern to human well-being all around the world. Therefore, a study was designed for the assessment of the quality of drinking water from randomly selected seven major traditional water sources in the periphery of historic Chamba town. This paper consists of the historic importance of these water sources, the perception and perspectives of their users along with qualitative analysis of total dissolved solids, total hardness and metal salts. The qualitative and physiochemical analysis confirms that the quality of water in all these sources is still within the safe limits of drinking water with limited variation in range but requires special attention for their safe guard.
印度喜马偕尔邦的昌巴镇以其传统的天然地下排水沟、泉水和井水而闻名,当地方言称其为Panihar、Nara和Boury。这些是河谷地区供人类消费的主要传统淡水来源。水是人类赖以生存的最基本的自然资源之一。但是,由于气候变化的普遍影响和无计划的人类活动造成的污染物负荷的增加,这些天然水源的水质正在日益恶化。自然水源的恶化是全世界人类福祉的一个重大关切。为此,本研究在昌巴古镇周边随机选取7个主要传统水源进行饮用水水质评价。本文包括这些水源的历史重要性,用户的看法和观点,以及总溶解固体,总硬度和金属盐的定性分析。定性和理化分析证实,所有这些水源的水质仍在饮用水的安全范围内,范围变化有限,但需要特别注意其安全防护。
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引用次数: 0
Enviro-Health Dimensions of Environment Impact Assessment (EIA) Draft Notification 2020 and COVID-19 Pandemic 2020年环境影响评估(EIA)通知草案的环境健康层面和新冠肺炎大流行
IF 0.5 Q4 ENVIRONMENTAL SCIENCES Pub Date : 2023-01-23 DOI: 10.3233/ajw230007
M. Nomani
The enviro-health dimensions of the Environment Impact Assessment (EIA) Draft Notification 2020 and the COVID-19 pandemic in India needs dispassionate reading despite its criticism of being medically motivated and relaxing public scrutiny of B2 projects. The EIA law began in 1994 has finished 25 years of its authorisation and work in 2019. The EIA law encouraged excellent administration and ecological equity. The EIA law is in the constant deluge of experimentation, as evident from the 55-time changes and 230 government circulars from 2006-2021. The EIA Notification, 2006, has intensified the disarray and alteration in EIA law arrangement. The salubrious enactment made statutory requirements on the continuous relaxing mode. The worldwide rankings on the working of EIA law in 2020 by Yale University’s Environmental Performance Index positioned India as 168 out of 180 nations. The fundamental qualities of benchmarking contain 32 markers and decade execution patterns. The EIA Notification, 2020 subsumes these concerns by providing public participation, ex-post-facto clearances, and speedy authorisations of environmental projects. The EIA law gets promissory to ecological improvement, contamination control standards and health protection.
2020年环境影响评估(EIA)通知草案和印度新冠肺炎疫情的环境健康层面需要冷静解读,尽管它被批评为出于医学动机和放松了B2项目的公众审查。环境影响评估法始于1994年,已于2019年完成了25年的授权和工作。环境影响评估法鼓励优秀的管理和生态公平。从2006-2021年的55次时间变化和230份政府通知中可以明显看出,环境影响评估法正处于不断的实验洪流中。2006年的《环境影响评估公告》加剧了环境影响评估法律安排的混乱和变化。这部健康的法令对持续放松模式提出了法定要求。耶鲁大学环境绩效指数对2020年环境影响评估法实施情况的全球排名将印度列为180个国家中的168个。基准测试的基本质量包含32个标记和十年执行模式。《2020年环境影响评估通知》通过提供公众参与、事后许可和环境项目的快速授权,将这些问题纳入其中。环境影响评估法承诺改善生态、污染控制标准和健康保护。
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引用次数: 0
Reduction of Chromium in Waste Water From Hard Chrome Plating Processes: A Review 镀硬铬废水中铬的还原研究进展
IF 0.5 Q4 ENVIRONMENTAL SCIENCES Pub Date : 2023-01-23 DOI: 10.3233/ajw230008
R. Basavaraja, O. Rahul, M. Ranganatha, K. Suhas, K. Vishnumurthy
Waste water from hard chrome is considered to be highly toxic due to the presence of chromium ions in hexavalent form and this hexavalent state of chromium is more toxic to animals and humans due to its ability to produce reactive oxygen species in cells. Such heavy metals are considered as carcinogenic to living organisms and hence either reduction of ions to trivalent chromium or removal of ions has to be done before ejecting the waste water into the environment. Many processes for reduction, neutralisation and removal of hexavalent chromium have been investigated and reviewed extensively. In the present review, studies and research carried out for the removal of chromium from waste water of hard chrome plating effluent are summarised. The study was carried out on the aspects such as percentage removal, efficiency and optimum operating conditions in chrome removal and reduction processes.
硬铬废水被认为是高毒性的,因为存在六价形式的铬离子,而这种六价状态的铬对动物和人类的毒性更大,因为它能够在细胞中产生活性氧。这些重金属被认为对生物体具有致癌性,因此在将废水排入环境之前,必须将离子还原为三价铬或去除离子。许多还原、中和和去除六价铬的方法已经得到了广泛的研究和综述。综述了国内外在硬铬电镀废水中除铬的研究进展。对脱铬还原工艺的去除率、效率和最佳操作条件进行了研究。
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引用次数: 0
Challenges and Prospects of Flood Early Warning Systems: A Study of Narayani Basin 洪水预警系统的挑战与展望——以Narayani盆地为例
IF 0.5 Q4 ENVIRONMENTAL SCIENCES Pub Date : 2023-01-23 DOI: 10.3233/ajw230004
C. Pandey, Anoj Basnet
Floods are the most dangerous and detrimental hazards in Nepal. Communities inhabiting the Narayani basin are getting affected by floods every year. However, no studies have been conducted to analyze the existing early warning system’s functional capacity and community feedback. Literature on disasters and calamities indicates that an efficient and effective flood early warning system is crucial for making communities flood resilient but we note that unless ‘community capacity for response’ is also strengthened, early warning technology alone cannot protect against losses and damages. Employing a qualitative approach, we explored the existing status of a community-based flood early warning system, and the challenges and prospects of these technologies for building flood-resilient communities in the Narayani basin of Nepal. We found that the existing warning system in the basin is fragmented, unreliable and cannot contribute to building flood-resilient communities. This study concludes that making communities flood resilient, at least, needs five components inclusive of the installation of more reliable early warning technologies; promotion of community-based early warning systems; timely communication of early warning alerts; training on preparedness and response; flood and climate-proof livelihood options.
洪水是尼泊尔最危险和最有害的灾害。居住在Narayani流域的社区每年都受到洪水的影响。然而,尚未进行任何研究来分析现有预警系统的功能能力和社区反馈。关于灾害的文献表明,高效有效的洪水预警系统对于使社区抵御洪水至关重要,但我们注意到,除非“社区应对能力”也得到加强,否则仅靠预警技术无法抵御损失和破坏。采用定性方法,我们探讨了基于社区的洪水预警系统的现状,以及这些技术在尼泊尔Narayani流域建设抗洪社区方面的挑战和前景。我们发现,该流域现有的预警系统是分散的、不可靠的,无法为建设抵御洪水的社区做出贡献。这项研究得出的结论是,使社区具有抗洪能力至少需要五个组成部分,包括安装更可靠的预警技术;促进以社区为基础的早期预警系统;及时通报预警警报;准备和应对培训;防洪和抵御气候变化的生计选择。
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引用次数: 1
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Asian Journal of Water, Environment and Pollution
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