Open AccessASSESSMENT OF THE ROOF - HARVESTED RAINWATER QUALITY IN SOME SUBURB DISTRICTS, HANOI, VIET NAM
Author(s) -
Nguyễn Thị Thanh Hà
Publication year - 2018
Publication title -
vietnam journal of science and technology/science and technology
Language(s) - English
Resource type - Journals
eISSN - 2815-5874
pISSN - 2525-2518
DOI - 10.15625/2525-2518/55/4c/12138
Subject(s) - rainwater harvesting , roof , permanganate , environmental science , environmental engineering , tile , water quality , hydrology (agriculture) , geography , engineering , chemistry , archaeology , geotechnical engineering , ecology , biology , inorganic chemistry
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. The pH values obtained were almost in the basic range, of which 38/90 samples (42.2 %) were greater than 8.5 and exceeded the standard (QCVN 01:2009/BYT), only 4 samples had acidic water with pH around 4.5. For permanganate value, they ranged from 0.33 to 5.61 mg/L with the number of samples exceeded the permitted standard reaching 30/90 and 17/90 samples in the 1st and 2nd campaign, respectively. In the 1st campaign, the total coliforms and E.coli were detected in 75 and 72 % of the roof harvested rainwater samples, respectively; while in the 2nd campaign these numbers were 62 and 38 %, respectively.