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1. Go for in-line pipe treatment units

Hello,

I am Mr. Aditya Aphale. I am doing M.Tech (Environmental) at Walchand College of engineering, Sangli in Maharashtra. I am currently working in project phase. My project topic is "Studies on quality and treatment of rooftop harvested rainwater in Sangli".

During my preliminary study, I have carried out characterization of rooftop harvested rainwater. I have analyzed various parameters like pH, turbidity, conductivity, hardness, chlorides, nitrates, acidity, alkalinity, heavy metals like Pb, Zn, Cd, Cu, Cr, As, Ca, Mg, Mn, Fe, etc and trace elements like Na, K, Ba, Ni, etc. Out of all these parameters turbidity and heavy metals are of mainly concerned regarding quality issue. If harvested rainwater want to use for any utility purpose, it is necessary to install treatment units for the removal of various contaminants.

Now, regarding FRP roof, due to FRP roof, the rainwater precipitating on the roof may get contaminated with various contaminants like heavy metals and other minor/trace elements. Because I have gone through various literature review, and various studies have been conducted on effect of FRP roofs on the quality of rooftop harvested rainwater. These all studies concludes that there is contamination of heavy metals and trace elements in harvested rainwater. the contamination of these heavy metals and other elements mainly depends upon atmospheric pollutants present surrounding that area, if rain occurs during highly polluted atmospheric conditions, rainwater washes out the atmospheric pollutants and get contaminated. So, this water is get contaminated heavily with heavy metals and dust particles.

So this harvested rainwater should be treated and can be used for daily utility activities like Bathing, Cooking, washing, etc. The roof surface doesn't play that much role in contamination of rainwater, as rainwater is getting contaminated due to other atmospheric conditions. But FRP roofs can show various leaching actions when get contact with rainwater, means various trace particles/contaminants can get leached from FRP roofs, can contaminate water.

So it is better to treat the harvested water when it is being used for utility purposes like bathing, cooking, washing, etc.

There are various types of in-line pipe treatment units like in-line pipe filters for RWH. But those filters are having lot of drawbacks such as, they are less efficient in removing contaminants like heavy metals, they can remove the turbidity, but the efficiency is also less.

There can be one another option for treatment, that, harvested rainwater can be collected first and treated separately and stored. But separate treatment systems may be costly than in-line pipe treatment units. So, it is better to go for in-line pipe treatment units.

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