Assessment of the Roof - Harvested Rainwater Quality in Some Suburb Districts, Hanoi, Viet Nam

Abstract

In this paper, the quality of roof harvested rainwater in Dan Phuong, Phuc Tho and Ung Hoa districts, Ha Noi city was assessed. Roof-harvested rainwater were taken in 2 campaigns (November 2015 and April 2016) then analyzed according to the QCVN 01:2009/BYT. The findings showed that in the studied districts, rainwater was collected from the tile, concrete, fibro cement and metal roofing, of which tile roof is the most common one which accounted for 65.6 %. The quality of roof-harvested rainwater in general was rather good. However, parameters including pH, permanganate value, total coliform and Ecoli did not meet the standards. nd campaign, respectively. In the 1 st campaign, the total coliforms and E.coli were detected in 75 and 72 % of the roof harvested rainwater samples, respectively; while in the 2 nd campaign these numbers were 62 and 38 %, respectively.