Investigation into Physicochemical Parameters of Harvested Rainwater with Respect to Drinking Water Quality Standards
Başlık çevirisi mevcut değil.
- Tez No: 688980
- Danışmanlar: PROF. DR. DANIŞMAN YOK
- Tez Türü: Yüksek Lisans
- Konular: İnşaat Mühendisliği, Çevre Mühendisliği, Civil Engineering, Environmental Engineering
- Anahtar Kelimeler: Belirtilmemiş.
- Yıl: 2020
- Dil: İngilizce
- Üniversite: Unıversıty Of Portsmouth
- Enstitü: Yurtdışı Enstitü
- Ana Bilim Dalı: Belirtilmemiş.
- Bilim Dalı: Belirtilmemiş.
- Sayfa Sayısı: Belirtilmemiş.
Özet
The need for water is gradually increasing due to many factors such as urbanization, climate change and drought. Therefore, interest in rainwater harvesting systems, which have been used for potable and non-potable purposes since ancient times, has been increasing in recent years. Despite this, the low quality of water collected in rainwater harvesting systems poses significant concerns, particularly in the use of drinking. The sources of chemical contaminants and the path of them to reach the storage tank are complicated. The aim of this dissertation was to make recommendations to improve the physicochemical quality of the harvested rainwater for drinking water by examining whether the chemical pollutants in the rainwater harvesting systems are mostly caused by the pollutants picked-up by the rainwater in the atmosphere or the pollutants accumulated on the roof. Secondary data on physicochemical parameters were collected after a detailed literature review to achieve this aim. Eleven different studies in which the data were collected were selected using the Google Scholar engine according to the created study inclusion criteria. Mean levels of physicochemical parameters of direct rain, first-flush and storage tank were compared with WHO drinking water guideline limits and parameters that concern about drinking water were determined. When comparing the parameters in the first-flush and the storage tanks after the first-flush was removed, it was determined that more than 50% of pollutants were in the first-flush, indicating that the pollutants in storage tanks were caused by substances accumulating on the roof rather than direct rain. Also, NO3, SO4, TDS, TSS, Cu, Mg and Cu concentrations in the storage tank meet WHO drinking water guideline limits in all studies after the removal of the first-flush. In the storage tanks, pH, turbidity, Al, Zn, and Pb concentrations exceeded WHO drinking water guideline limits in many studies, depending on the proximity to pollution sources and the materials of roof, gutter and downpipes in the rainwater harvesting system. In these cases, measures such as cleaning and maintenance after a long period of dry days, using of filter in the point-of-use and using of the non-metallic roof, gutter and downpipes must be taken before using the harvested rainwater for drinking purposes. In addition, in cases where the physicochemical parameters in direct rain exceed WHO drinking water guideline limits, additional treatment was recommended for the harvested water before using of drinking purposes since more first-flush volume or filtration would not be sufficient.
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