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Design of an Intermittent Biosand Filter Amended with Oyster Shell Powders for the Improvement of Household Water Quality in Sub-Saharan Africa and Madagascar 为改善撒哈拉以南非洲和马达加斯加的家庭水质设计掺有牡蛎壳粉末的间歇式生物沙滤器
Pub Date : 2024-07-04 DOI: 10.11648/j.ajep.20241303.12
Cloreil Eboa, Hervé Ravelonandro, Suzanne Ngo, Rodrigue C. S. Ebonji, R. Andrianaivoravelona, François Tchoumbougnang
Access to safe drinking water and the wide spread of water-borne diseases are major challenges in Sub-Saharan Africa and Madagascar. Based on this, a water purification models has been developed which can use on a local scale. It consists of an intermittent biosand filter amended with oyster shell powders designed from local materials. The performance of the filter was evaluated through physicochemical and bacteriological analyses using standardized methods on raw polluted well water with previously determined initial D0 characteristics. The effectiveness of the designed filter was assessed and a filtration operation was carried out over a monitoring period of 13 days (D13) prior to 7 days of acclimatization of the system. With a filtration rate of 0.75l/h-1, there is a very strong reduction in turbidity from 35.59NTU to 0 NTU and in BOD5 from 125mg/l to 2mg/l. More so, bacteriological analyses reveal a progressive and complete decrease from D0 to D13 of fecal coliforms from 9000 CFU/100ml to 0 CFU/100ml; total coliforms from 6,000 CFU/100 ml to 0 CFU/100 ml and fecal streptococci from 10,800 CFU/100 ml to 0 CFU/100 ml. Compared to the classic ceramic filter, no significant difference in the Duncan test is reported for the highlighted parameters. This filter presents potential among other water treatment methods at the local scale for reducing the risks of water-borne diseases and achieving Sustainable Development Goal 6 in developing countries.
在撒哈拉以南非洲和马达加斯加,获取安全饮用水和水传播疾病的广泛传播是主要挑战。在此基础上,开发了一种可在当地使用的水净化模型。它由一个间歇式生物沙过滤器组成,过滤器中添加了由当地材料设计的牡蛎壳粉末。过滤器的性能是通过使用标准化方法对污染井水进行物理化学和细菌学分析来评估的。在系统适应 7 天之前,对所设计过滤器的有效性进行了评估,并在 13 天(D13)的监测期内进行了过滤操作。在 0.75 升/小时-1 的过滤速率下,浊度从 35.59NTU 降至 0NTU,生化需氧量从 125 毫克/升降至 2 毫克/升。此外,细菌学分析表明,从 D0 到 D13,粪大肠菌群从 9000 CFU/100 毫升逐渐完全减少到 0 CFU/100毫升;总大肠菌群从 6000 CFU/100 毫升减少到 0 CFU/100 毫升;粪链球菌从 10800 CFU/100 毫升减少到 0 CFU/100 毫升。与传统陶瓷过滤器相比,在邓肯试验中,突出参数没有明显差异。这种过滤器与其他水处理方法相比,具有在地方范围内降低水传播疾病风险和实现发展中国家可持续发展目标 6 的潜力。
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引用次数: 0
Level and Origin of Faecal Contamination of the Waters of a Tropical Urban Lagoon: The Case of the Ebrié Lagoon 热带城市泻湖水域粪便污染的程度和来源:埃布里耶泻湖案例
Pub Date : 2024-06-02 DOI: 10.12691/env-12-2-1
Akilinon Gansso Valentin, Kombo Mananga Olivier Simon, Yaya Coulibaly, Yapo Ossey Bernard
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引用次数: 0
Noise Pollution Assessment, Spatial Noise Mapping and Associated Health Impacts in Dinajpur City, Bangladesh 孟加拉国迪纳杰布尔市的噪声污染评估、空间噪声绘图及相关健康影响
Pub Date : 2024-05-17 DOI: 10.11648/j.ajep.20241302.12
Shree Basak, Nazmunnaher Nipa, Touhidur Tuhin, Mohammad Uddin
Noise pollution is one of the more prevalent types of pollution caused mainly by urbanization. It is characterized as noise propagating throughout a living being in a way that is to its physical and mental health. Along with the growth of the city, trade, business, shopping, education, and other activities have been accelerating. The main purpose of the study was to address the dangerous point of noise pollution in Dinajpur municipality and identify the causes of noise pollution. For this study, data sets on the amount of noise pollution at 35 different places throughout Dinajpur city have been analyzed. Three shifts of data collection were conducted: morning (8 am to 10 am), afternoon (12 pm to 2 pm) and evening (4.00 pm-6.00 pm). Using the ArcGIS 10.8 program, descriptive statistics tools and analysis of variance were carried out. The highest average noise level (105.7 dB) was found at Central Bus Terminal at the time of evening which is a mixed zone. The lowest average noise level (64 dB) was found at Chotogurgola and Balubari at the time of morning and evening respectively which is residential zone. The noise levels throughout the city vastly exceed both the WHO and DoE recommendations. The main causes of noise pollution are the expanding urban area, unregulated auto rice mills establishment, the heavy use of construction equipment, automobile engines, uncontrolled horns, and outrageous auto rickshaws etc. It is vital to take action to lower noise levels because prolonged exposure to noise has numerous negative effects. The development of comprehensive land use plans for this city would benefit from taking noise pollution into consideration.
噪声污染是主要由城市化造成的一种较为普遍的污染。它的特点是噪声在整个生物体内传播,影响生物的身心健康。随着城市的发展,贸易、商业、购物、教育和其他活动也在加速进行。本研究的主要目的是解决迪纳杰布尔市噪音污染的危险点,并找出噪音污染的原因。本研究分析了迪纳杰布尔市 35 个不同地点的噪声污染量数据集。数据收集分三班进行:上午(上午 8 时至 10 时)、下午(中午 12 时至下午 2 时)和傍晚(下午 4 时至下午 6 时)。使用 ArcGIS 10.8 程序进行了描述性统计工具和方差分析。平均噪音水平最高的时段(105.7 分贝)出现在傍晚时分的中环巴士总站,这是一个混合区。平均噪音水平最低(64 分贝)的地方是 Chotogurgola 和 Balubari,分别位于清晨和傍晚,属于住宅区。整个城市的噪音水平大大超过了世界卫生组织和教育部的建议。造成噪声污染的主要原因是城市面积不断扩大、汽车碾米厂的设立不受管制、建筑设备的大量使用、汽车发动机、不受控制的喇叭声和令人发指的人力车等。采取行动降低噪音水平至关重要,因为长期暴露在噪音环境中会产生许多负面影响。在制定该城市的综合土地利用规划时,应考虑到噪音污染问题。
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引用次数: 0
Effects of Operating Conditions on the Performance of NF270 and TW30 Membranes During As (III) Removal 操作条件对 NF270 和 TW30 膜去除砷 (III) 性能的影响
Pub Date : 2024-04-14 DOI: 10.12691/env-12-1-2
Dompé Ghislain Ahoulé, Franck Lalanne
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引用次数: 0
Influences of Heavy Metals in Water Treatment Chemicals on Drinking Water Quality and Risk Management 水处理化学品中的重金属对饮用水水质和风险管理的影响
Pub Date : 2024-04-02 DOI: 10.11648/j.ajep.20241302.11
Zhi-Xuan Li, She-Xia Zhan, Kou Tin-Ian, Qian-Ning Zhao, Chi-Tou Lei
Water treatment chemicals (WTCs) are important raw materials during the drinking water production process. Occasionally unqualified WTCs with heavy metals were provided to Water Treatment Plant(WTP) by supplier during emergency situation,such as earthquake, typhoon and city block for epidemic disease, just because it cannot obtain the qualified WTCs. The harmful heavy metals in WTCs may expose a certain health risk to the quality of drinking water. In this paper, the influence of heavy metals in WTCs on the quality of drinking water was explored and the feasible management measures are proposed, taking the ILha Verda Water Plant (IVP) in Macao as an example. The study was based on the testing results of heavy metals in WTCs and treated water from 2017 to 2022 in IVP. A series of mathematical models were established to evaluate the content of heavy metals in water brought by WTCs. The removal rates of the water treatment process to the heavy metals were calculated at same time. The maximum allowable concentrations of heavy metals in WTCs were calculated and accessed. The results show that the drinking water is safety if the heavy metals in unqualified WTCs are under the maximum allowable concentrations. Then it is proposed for the classification of WTCs and risk management. The study will provide theoretical and technical support for water quality safety supervision and water supply management.
水处理化学品(WTC)是饮用水生产过程中的重要原材料。在地震、台风、城市疫情等紧急情况下,供应商偶尔会向水处理厂(WTP)提供含有重金属的不合格 WTC。在紧急情况下,如地震、台风和城市疫区,供应商因无法获得合格的永利国际娱乐平台而向水处理厂(WTP)提供含有重金属的不合格永利国际娱乐平台。永利国际娱乐中的有害重金属可能会对饮用水水质造成一定的健康风险。本文以澳门永利国际娱乐平台水厂为例,探讨了永利国际娱乐平台中重金属对饮用水水质的影响,并提出了可行的治理措施。该研究基于 2017 年至 2022 年 IVP 永利国际娱乐平台和处理水的重金属检测结果。研究建立了一系列数学模型,以评估永利澳门娱乐场网站自来水中的重金属含量。同时计算了水处理工艺对重金属的去除率。计算并获取了永利国际娱乐中重金属的最大允许浓度。结果表明,如果不合格永利国际娱乐中的重金属低于最大允许浓度,则饮用水是安全的。然后提出了永利国际娱乐平台分类和风险管理的建议。该研究将为水质安全监管和供水管理提供理论和技术支持。
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引用次数: 0
Water Quality Assessment of Groundwater Using Multivariate Statistical Techniques: A Case Study of Mogadishu, Banadir Region, Somalia 利用多元统计技术评估地下水水质:索马里巴纳迪尔地区摩加迪沙案例研究
Pub Date : 2024-02-21 DOI: 10.11648/j.ajep.20241301.13
Abdolahi Mohamed Adawe, Saed Jama Abdi, Abdirahman Mayow Abdi, Abdirahman Dahir Omar
This study was carried out to assess the groundwater quality around the Mogadishu area, Banadir region, Somalia. Multivariate statistical techniques such as factor analysis (FA), principal component analysis (PCA) and cluster analysis (CA)were applied to 22 groundwater samples collected from boreholes and dug wells in the coastal line districts namely: Wadajir, Kaxda and Dharkinley districts of Banadir region, Somalia. Correlations among 14 hydrochemical parameters were statistically examined. A two-factor model is suggested and explains over 82.4% of the total groundwater quality variation. Factor Analysis (FA) revealed significant variables including electrical conductivity (EC), pH value and other parameters such as K+, Ca2+, Mg2+, Na+, SO42- and hardness expressed as CaCO3, Chlorine, Fluoride, B, S, Si, and NO3 which are responsible for variations in groundwater quality and affect water chemistry. The results were compared with the World Health Organization (WHO) standard guidelines. Geographic Information System (GIS) was used to create the spatial distribution maps of water quality parameters. Cluster Analysis (CA) grouped all sites into three zones based on spatial similarities and dissimilarities of physiochemical properties. The pH value and Boron, fluoride calcium, magnesium, sulfide, potassium, and Silica are well within the desirable limit at all locations. However, the concentration of conductivity chloride, hardness as CaCO3, sulfate, nitrate, and Sodium in all samples exceeded the desirable WHO maximum permissible limit. The study reveals that the groundwater quality changed due to anthropogenic and natural influences such as natural weathering processes. As a result of this the qualities of the boreholes and dug well water samples were therefore not suitable for human consumption without adequate treatment. Regular monitoring of groundwater quality, abolishing unhealthy waste disposal practices, and introducing modern techniques are recommended.
本研究旨在评估索马里巴纳迪尔地区摩加迪沙周围的地下水质量。研究采用了多元统计技术,如因子分析(FA)、主成分分析(PCA)和聚类分析(CA),对从沿岸地区(即巴纳迪尔地区的瓦达吉尔、卡克斯达和达尔金利)的钻井和挖井中采集的 22 个地下水样本进行了分析:对从索马里巴纳迪尔地区的瓦达吉尔、卡克斯达和达尔金利等沿海地区的钻井和挖井中采集的 22 个地下水样本进行了分析。对 14 个水化学参数之间的相关性进行了统计分析。提出了一个双因子模型,该模型可解释 82.4% 以上的地下水水质总变化。因子分析(FA)揭示了一些重要变量,包括电导率(EC)、pH 值和其他参数,如 K+、Ca2+、Mg2+、Na+、SO42- 和硬度(以 CaCO3、氯、氟、B、S、Si 和 NO3 表示),它们是造成地下水水质变化和影响水化学的原因。研究结果与世界卫生组织(WHO)的标准指南进行了比较。使用地理信息系统(GIS)绘制了水质参数的空间分布图。聚类分析(CA)根据理化性质的空间相似性和差异性将所有地点分为三个区域。所有地点的 pH 值、硼、氟化钙、镁、硫化物、钾和二氧化硅都在理想范围内。然而,所有样本中的电导率氯化物、硬度(CaCO3)、硫酸盐、硝酸盐和钠的浓度都超过了世界卫生组织规定的最高允许限值。研究表明,由于人为和自然的影响(如自然风化过程),地下水的水质发生了变化。因此,未经适当处理的井水和挖井水样本不适合人类饮用。建议定期监测地下水水质,废除不健康的废物处理方法,并引进现代技术。
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引用次数: 0
Current Methods and Challenges of Managing Clinical Solid Waste at Juba Teaching Hospital, South Sudan 南苏丹朱巴教学医院管理临床固体废物的现行方法和挑战
Pub Date : 2024-02-21 DOI: 10.11648/j.ajep.20241301.12
Moses Osman Mathew Woni, William Bol Yaak Giet, David Nasir Morris, Charles Mahmoud Sebit Manya, Paul Lado Demetry Jubek
The amount of clinical solid waste generated at Juba Teaching Hospital has been increasing as a result of the increasing population of Juba city. Despite the increase in the amounts of clinical solid waste, few scientific studies were conducted and the studies focused only on municipal solid waste management and have not explored clinical solid waste management in Juba City. A survey study aimed to explore the current methods and challenges of clinical solid waste management (CSWM) at Juba Teaching Hospital was conducted. The data was obtained through questionnaires, observation and oral interview. Word-excel-2013 and Statistical Package for Social Sciences (SPSS) IBM – 2021 version were used to process the data. The results revealed inappropriate methods of clinical solid waste management practices such as irregular collection, mixing different types of solid wastes together, use of water bottles instead of safety boxes for segregation of sharps, manual transportation of solid wastes, unprotected storage site, irregular incineration, open burning and random dumping. Reasons such as insufficient equipment, negligence of hospital administrators and few numbers of waste collectors was attributed to the inappropriate management of clinical solid waste in the hospital. The study recommended adoption of recycling strategies, employment of more waste handlers, commensurate remuneration and motivation, provision of enough equipment, creation of staff awareness and capacity development on health implications of poor clinical solid waste management.
随着朱巴市人口的增加,朱巴教学医院产生的医疗固体废物量也在不断增加。尽管临床固体废物的数量有所增加,但进行的科学研究却寥寥无几,而且这些研究仅侧重于城市固体废物管理,并未对朱巴市的临床固体废物管理进行探讨。我们开展了一项调查研究,旨在探索朱巴教学医院临床固体废物管理 (CSWM) 的当前方法和挑战。数据通过问卷调查、观察和口头访谈获得。数据处理使用了 Word-excel-2013 和 IBM - 2021 版社会科学统计软件包 (SPSS)。结果显示,临床固体废物管理方法不当,如收集不规范、将不同类型的固体废物混在一起、使用水瓶而不是安全箱来隔离利器、人工运输固体废物、储存地点无保护、焚烧不规范、露天焚烧和随意倾倒。设备不足、医院管理人员疏忽和废物收集人员数量少等原因是造成医院临床固体废物管理不当的原因。研究建议采取回收策略,雇用更多的废物处理人员,给予相应的报酬和激励,提供足够的设备,提高员工对不良临床固体废物管理对健康影响的认识和能力。
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引用次数: 0
Water Evaporation and Soil Suction Measurements of Different Soil Types in Jordan 约旦不同土壤类型的水分蒸发和土壤吸力测量结果
Pub Date : 2024-01-23 DOI: 10.11648/j.ajep.20241301.11
M. A. Hadi, Nidhal Saada, Jumana Hussary
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引用次数: 0
Seasonal Variation of the Physico-Chemical Parameters and Irrigation Suitability of the Waters of the Tsieme River in Brazzaville (Congo) 布拉柴维尔(刚果)Tsieme 河水物理化学参数的季节性变化和灌溉适宜性
Pub Date : 2023-11-17 DOI: 10.11648/j.ajep.20231206.12
Tchoumou Martin, Moussoki Nsona Promesse, Louzayadio Mvouezolo Raison Félicien, Engambe Christ Bardoul
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引用次数: 0
Biodegradation by Landfarming On-Site of Petroleum Waste from Refining at Pointe-Noire (Republic of Congo) 黑角(刚果共和国)炼油产生的石油废物在现场通过土地耕种实现生物降解
Pub Date : 2023-11-11 DOI: 10.11648/j.ajep.20231205.12
Vitaline Vanessa Morabo Okoletimou, J. Nzila, N. Watha-Ndoudy, Augustin Aimé Lebonguy
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引用次数: 0
期刊
American Journal of Environmental Protection
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