地下水资源腐蚀和结垢潜力评价——以埃塞俄比亚迪勒达瓦市为例

IF 0.3 Q4 MULTIDISCIPLINARY SCIENCES Momona Ethiopian Journal of Science Pub Date : 2021-08-15 DOI:10.4314/mejs.v13i1.6
Girmaye Haile Gebremikael, Aman Hussien Dawod
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引用次数: 4

摘要

迪勒达瓦市几乎100%的供水来自地下水(包括钻孔、挖井和泉水)。最近,地下水由于其溶解离子的含量而引起供水系统的腐蚀和结垢问题,这可能导致公共卫生和经济问题。本文研究了城市地下水的腐蚀和结垢潜力,并用制图将其可视化。采用分光光度法、EDTA/酸滴定法计算水质参数。GW图用于Piper图的校准图,用于对水类型进行分类。Langelier saturation (LSI)、Ryznar (RSI)、aggressive (AI)、Puckorius Scale (PSI)和Larson-Skold (LRI)指数使用Excel®进行处理,并使用ArcGIS 10®对其空间分布进行可视化。LSI、RSI、PSI、AI、LRI的平均值分别为0.29±0.28、6.4±0.5、5.10±0.48、12.20±0.24、1.4±1.57。LSI和RSI结果表明,除东北地区有腐蚀性地下水外,大部分地区地下水有中低结垢倾向。从AI值来看,除东北和西北边缘地区外,几乎所有地区的地下水都处于低腐蚀状态。PSI表明水倾向于以中等速率形成盐垢。LSI的结果表明,除了可能发生局部腐蚀的西北和东北地区外,氯化物和硫酸盐不太可能干扰保护膜的形成。综上所述,在几乎所有的城市分布系统中都受到碳酸钙结垢的影响。西北和东北地区地下水氯化物和硫酸盐含量较高,造成局部腐蚀。
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Assessment of Corrosion and Scale forming Potential of Groundwater Resources: Case Study of Dire Dawa City, Ethiopia
Almost 100% of the water supply of Dire Dawa City is from groundwater (including boreholes, dug wells, and springs). Recently, groundwater cause corrosion and scale problems to water distribution systems due to its content of dissolved ions that can cause public health and economic issues. The present paper investigates the corrosion and scale-forming potential of the groundwater in the city and visualizes it with mapping. Spectrophotometer, EDTA/Acid titration with calculation methods were used for water quality parameters analysis. GW Chart Calibration plot applied for the Piper diagram to categorizes the water types. Langelier saturation (LSI), Ryznar (RSI), aggressive (AI), Puckorius Scale (PSI), and Larson-Skold (LRI) indices were manipulated with Excel ® and visualized their spatial distribution using ArcGIS 10®. The mean values of LSI, RSI, PSI, AI, and LRI obtained were 0.29 ± 0.28, 6.4 ± 0.5, 5.10 ± 0.48, 12.20 ± 0.24, and 1.4±1.57 respectively. LSI and RSI results indicate moderate to low scale-forming tendency of groundwater in most parts except the northeastern part with corrosive groundwater. Based on the AI value, the groundwater ranges low corrosion in almost all zones except the edge of the northeast and northwest region. PSI indicated the water tends to form salt-scale at a medium rate. The LSI results showed that chloride and sulphate are unlikely to interfere with the formation of protecting film except in northwestern and northeastern regions where localized corrosion might occur. In conclusion, in almost all distribution system of the city is affected by calcium carbonate scale formation. The groundwater in the northwest and northeast resulted in localized corrosion because of relatively high contents of chlorides and sulphates.
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来源期刊
Momona Ethiopian Journal of Science
Momona Ethiopian Journal of Science MULTIDISCIPLINARY SCIENCES-
自引率
0.00%
发文量
13
审稿时长
12 weeks
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