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781.
Ahmet Z. Sahin Shafiqur Rehman Fahad Al-Sulaiman 《International Journal of Green Energy》2017,14(5):490-498
Daily global solar radiation on a horizontal surface and duration of sunshine hours have been determined experimentally for five meteorological stations in Saudi Arabia, namely, Abha, Al-Ahsa, Al-Jouf, Al-Qaisumah, and Wadi Al-Dawaser sites. Five-years of data covering 1998–2002 period have been used. Suitable Angstrom models have been developed for the global solar radiation estimation as a function of the sunshine duration for each respective sites. Daily averages of monthly solar PV power outputs have been determined using the Angstrom models developed. The effect of the PV cell temperature on the PV efficiency has been considered in calculating the PV power output. The annual average PV output energy has been discussed in all five sites for small loads. The minimum and maximum monthly average values of the daily global solar radiation are found to be 12.09 MJ/m2/d and 30.42 MJ/m2/d for Al-Qaisumah and Al-Jouf in the months of December June, respectively. Minimum monthly average sunshine hours of 5.89 hr were observed in Al-Qaisumah in December while a maximum of 12.92 hr in Al-Jouf in the month of June. Shortest range of sunshine hours of 7.33–10.12 hr was recorded at Abha station. Minimum monthly average Solar PV power of 1.59 MJ/m2/day was obtained at Al-Qaisumah in the month of December and a maximum of 3.39 MJ/m2/day at Al-Jouf in June. The annual PV energy output was found to be 276.04 kWh/m2, 257.36 kWh/m2, 256.75 kWh/m2, 245.44 kWh/m2, and 270.95 kWh/m2 at Abha, Al-Ahsa, Al-Jouf, Al-Qaisumah, and Wadi Al-Dawaser stations, respectively. It is found that the Abha site yields the highest solar PV energy among the five sites considered. 相似文献
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采用悬浮结晶法处理喹乙醇生产废液,考察了成冰率(冰晶融化后的体积占原水总体积的百分比)对废液COD、氨氮、TN和电导率去除效果的影响。在一级冷冻成冰率45%的条件下,经过三级冷冻处理后,三级出水的COD、氨氮、TN和电导率的去除率分别为99.4%、98.7%、98.5%和98.2%,一级浓缩液的COD、氨氮和TN的浓缩比分别为1.6、1.5和1.5;在一级冷冻成冰率80%的条件下,每一级出水的各项指标的去除率均有所下降,三级出水的COD、氨氮、TN和电导率的去除率分别为98.6%、98.3%、97.1%和95.9%,但一级浓缩液的浓缩比明显提高,COD、氨氮和TN的浓缩比分别为2.7、2.2和2.4。成冰率为80%时一级浓缩液的热值为7 449 J/g,在焚烧过程中可以依靠自身热量维持燃烧,不需要添加辅助燃料,减少焚烧处理的成本。 相似文献
783.
Abdelli I. S. Asnoune M. Arab Z. Abdelmalek F. Addou A. 《Journal of Material Cycles and Waste Management》2017,19(1):265-281
Journal of Material Cycles and Waste Management - The management of solid waste in Mostaganem district was limited to collection and transportation to open dumpsites. By the end of 2010, the... 相似文献
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北京燕山石化区土壤苯并(a)芘污染及其环境容量研究 总被引:1,自引:1,他引:0
本研究采用网格布点法对燕山石化区农田每一平方公里采集土样,同步采集农作物样品,对其苯并(a)芘进行残留量测定。并把无污染的同类土壤背景值作为评价标准。结果表明,土壤中BaP非污染面积占54.14%,轻度污染占12.27%,中度污染占12.03%,重度污染占21.66%;粮食中BaP的重度污染占43.06%。其污染程度:污灌重于混灌,混灌重于清灌。结合盆栽模拟试验,应用图论工具建立的数学模型,研究了BaP的土壤环境容量。 相似文献
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Sundar Niroula Kevin Wallington Ximing Cai 《Journal of the American Water Resources Association》2023,59(2):213-225
Data limitations often challenge the reliability of water quality models, especially in intensively managed watersheds. While numerous studies report successful hydrological model setup and calibration, few have addressed in detail the data challenges for multisite and multivariable model calibration to an intensively managed watershed. In this study, we address some of these challenges based on our reflective experience calibrating the Soil and Water Assessment Tool (SWAT) to the Upper Sangamon River Watershed in central Illinois based on daily flow, annual crop yield, and monthly sediment, nitrate, and total phosphorus loads. We highlight some challenges in SWAT calibration processes due to data errors and inconsistencies, and insufficient precipitation and water quality observations. Following, we demonstrate the merits of additional weather and water quality observations that could help reduce input uncertainties, and we provide suggestions for selecting appropriate observations for the model calibration. After dealing with the data issues, we show that the SWAT model could be calibrated with acceptable results for the case study watershed. 相似文献