A small solar desalination plant for the production of drinking water in remote arid areas of southern Algeria

Solar desalination plant for small size use in remote arid areas of South Algeria for the production of drinking water

A comprehensive review of direct solar desalination techniques and its advancements

A solar desalination plant for domestic water needs in arid areas of South Algeria

برای بررسی اثر سطوح شوری آب آبیاری و زمان شروع آبیاری با آب شور و لب‌شور بر خصوصیات کمی خربزه دیررس، آزمایشی با 7 تیمار و 3 تکرار در قالب بلوک‌های کامل تصادفی با استفاده از روش آبیاری قطره‌ای نواری، در مرکز تحقیقات کشاورزی و منابع طبیعی خراسان رضوی انجام شد. تیمارهای آبیاری عبارت بودند از: 1- آبیاری با آب شیرین (6/0 دسی‌زیمنس بر متر) از ابتدای کاشت تا انتهای فصل برداشت، 2- آبیاری با آب با شوری 3 دسی‌زیمنس برمتر از ابتدا تا انتهای فصل داشت، 3-آبیاری با آب با شوری 6 دسی‌زیمنس بر متر از ابتدا تا انتهای فصل، 4- آبیاری با آب با شوری 6 دسی‌زیمنس بر متر از 20 روز بعد از جوانه‌زنی تا انتها، 5- آبیاری با آب با شوری 3 دسی‌زیمنس بر متر از 20 روز بعد از جوانه‌زنی تا انتها، 6- آبیاری با آب با شوری 6 دسی‌زیمنس بر متر از 40 روز بعد از جوانه‌زنی تا انتها و 7- آبیاری با آب با شوری 3 دسی زیمنس بر متر از 40 روز بعد از جوانه‌زنی تا انتهای فصل داشت. نتایج نشان داد که، شوری آب بر عملکرد کل، عملکرد اقتصادی و کارآیی مصرف آب آبیاری تاثیر معنی‌داری داشت. بالاترین عملکرد کل و عملکرد اقتصادی و کارآیی مصرف آب آبیاری از تیمار شاهد بدست آمد که تفاوت آن‌ها با تیمارهای آب شور و لب‌شور معنی‌دار بود. در ضمن تفاوت بین عملکردهای تیمارهای شور و لب‌شور معنی‌دار نبودند. آبیاری با آب شیرین در اوایل دوره رشد باعث افزایش محصول نشده بلکه، باعث وارد شدن تنش بیشتر به گیاه می‌شود.

The performance of the capillary film solar still installed in South Algeria

The world demand for potable water is increasing steadily with growing population.Desalination using solar energy is suitable for potable water production from brackish and seawater.In this paper, we presents design, fabrication and testing of double slope solar still with external flatted and internal parabolic reflectors and also optimization of external flat reflector tilt angle for Egyptian climatic conditions.The external flat reflector tilted at (30°, 45°, 60° and 75°) on the horizontal plane.The depth of water inside basin still is 1cm.Experimental results were compared with conventional double slope solar still.Optimum tilt angle is found to be 60° with a maximum daily productivity of 9.89 lit/m 2 .

The global water concern is mainly about the scarcity of fresh water resources despite the abundance of saline and brackish water in oceans, seas, and underground. Solar desalination offers a worthy solution to produce fresh water by using solar radiation, which also lessens the energy concern by offering a renewable source of energy to alter the consumption of fossil fuels and other non-renewable resources. One of the solar desalination technologies is the solar still system, which is a portable unit capable of producing distilled water by evaporating brackish or saline water by using solar thermal energy. The steam is then condensed on the inside of the glass cover and collected as fresh water. Solar stills are easy to manufacture and install using local materials and workmanship, which suits underprivileged remote communities that face difficulties in finding clean potable water, while locating near a source of saline water. However, efficiency and productivity of solar stills are still feeble when compared to other traditional desalination techniques. As an attempt to overcome these issues, an upgraded system is proposed and tested experimentally to augment the incoming solar radiation falling on the top glass surface of the still by concentrating extra solar radiation to preheat the flowing feedwater to the solar still system. The results of the experimental study showed that the integration of linear Fresnel lenses has approximately tripled the productivity of distilled water and improved efficiency of a solar still, by about 68.76 %, when compared to a conventional non-concentrating solar still.KeywordsFresnel LensConcentrate Solar PowerSolar BeamMENA RegionSolar Altitude AngleThese keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Optimizing drip irrigation with alternate use of fresh and brackish waters by analyzing salt stress: The experimental and simulation approaches

Fresh water is scarce, making it a worldwide issue. In order to address global freshwater demand, a filtration technique is needed. Solar distillation (SD) that purifies brackish and subterranean water has been proven to be a promising green technology. It produces distilled water which can be used as potable water for drinking and other purposes. The designs, operations, and configurations of several inverted solar stills are thoroughly examined in this article. All techniques for solar water distillation to separate saltwater from freshwater have the same fundamental idea. It has been demonstrated that for a specified mass of water in the top basin, the daily output of an inverted absorber double-basin solar still (IASS) grows with increasing water depth in the bottom basin. Nevertheless, as the water depth in the bottom basin rises from 1 cm to 5 cm, the output of an inverted absorber double-basin solar system falls by about 27%. At water depths of 4, 6, and 8 cm, the daily yields from inverted absorber solar stills paired with a refrigeration cycle (RIASS) were 6.4, 10.08, and 9.5 L/day, respectively. The results also showed a substantial rise in water temperature in the inverted absorber solar still as a result of lower bottom heat loss and larger absorptivity. In this study, the emphasis on energy, efficiency, and environmental concerns remains with the modified multi-wick basin-type inverted absorber solar panel. The performance of the inverted trickling solar still was assessed with a 60 ppm average salinity under various sun radiation, feed water flow rate, and existence conditions for natural convection. It was found that the still could produce 2.55 L/day m2 of fresh water, a 15% increase. Brackish water with a salinity of 6000 ppm was used to test the still in November at tilt angles of 47° and 32°. Condensate production at the specified angles was 2.8 and 2 L/d, respectively. A total output of 6.907, 5.681, and 4.650 kg/m2/day was also generated using the modified multi-wick basin-type inverted absorber solar still (MMWBIASS) at water depths of 1, 2, and 3 cm, respectively. With black cotton wicks, the MMWBIASS had a total thermal efficiency of 34.04%, 28.17%, and 23.61%.

Fresh water deficits have reached most of the world population in recent years, and factors like climate change, population growth and Covid pandemic have increased this problem. Over the nineteenth century, several studies have developed operative methods for seawater desalination, which resulted in the incorporation of desalination plants all around the world, but the most used methods are the following three: reverse osmosis, multi-stage distillation and multi-effect evaporation. The studies have explored promising processes, some of them are very auspicious from the energy analysis, but not many of them have surpassed the pilot plant stage. One of the simplest and oldest methods include the use of solar stills to obtain fresh water and the improvements have come about with the combination of solar stills and mechanisms to facilitate water evaporation, heat exchange, water steam cooling and condensation collecting. This work presents the results of an active solar still seawater desalination process research and compares it with the most commonly used methods.KeywordsCombined desalination processSeawater desalinationSolar still

Chapter 4 - Solar-driven water treatment: generation II technologies

Modelling immersion corrosion of structural steels in natural fresh and brackish waters

The demand of fresh water is continuously increasing due to frequent rainfalls, shortage of ground water and pollution of natural resources via industrialization. Therefore, solar desalination of available saline and brackish water using solar still is gaining importance among the scientific community for domestic, irrigation and drinking purposes owing to be an economical and sustainable approach of producing fresh water with a simple working principle. Currently, continuous efforts have been made to improve the productivity of solar still by various techniques and configurations. A critical review of solar stills with phase change material (PCM) is presented. This paper highlights the impacts of design specifications along with an economic analysis and the type of PCM material used in recent past. Furthermore, a detailed discussion has been provided on future scope with recommendations to improve the productivity of fresh water for sustainability.

Phase change materials integrated solar desalination system: An innovative approach for sustainable and clean water production and storage

Analysis of desalination alternates for phosphoric acid plant in Tunisia