Sains Malaysiana 41(6)(2012): 739 –745
Physicochemical and Microbiological Analysis of
Drinking
Water Treated by Using Ozone
(Analisis
Fisikokimia dan Mikrobiologi Air Minimum yang dirawat dengan Ozon)
D.P. Subedi & A. Khadgi
Department Of Natural
Science, Kathmandu University, Dhulikhel, Nepal
R.B. Tyata
Department Of Physics, Khwopa
College, Dekocha, Bhaktapur, Nepal
C.S. Wong*
Plasma Technology
Research Centre, Physics Department, University Of
Malaya
50603 Kuala Lumpur, Malaysia
Diserahkan: 13 Julai
2011 / Diterima: 5 Januari 2012
ABSTRACT
This study focused on the application of
a Dielectric Barrier Discharge (DBD ) unit to
produce highly oxidizing ozone molecules for the treatment of drinking water.
The samples of water were collected from three different sources, namely tap,
stone spout and tube-well in the Kathmandu valley. Various physical, chemical
and micro-biological analyses were carried out to both the ozone treated and
untreated samples of water for comparison. Our results indicated that ozone
does not alter the physical characteristics, namely pH, conductivity and
turbidity of water but it has significant effect on the chemical properties
such as nitrate concentration, total hardness, calcium hardness, Fe(II) and Fe(III) concentration. It was observed that ozone
efficiently precipitates ferrous ion into ferric ion and is effective in the
removal of fecal coliform, a key element for various water related health
problems in most of the developing countries. It is shown that the treatment
with ozone leads to a significant reduction in the number of fecal coliform in
the samples of drinking water from tap, stone spout and tube well with p values
0.00182, 0.026 and 5.8 ×10-15,
respectively at 0.05 level of significance.
Keywords: Dielectric barrier
discharge; ozone; water treatment
ABSTRAK
Kajian ini berfokus
kepada kegunaan molekul ozon yang dihasilkan daripada nyahcas dielektrik
berpenghadang (DBD) untuk membersihkan air
minimum. Sampel air dari paip air,
batu spout dan perigi tuib di Lembah Kathmandu telah dirawati dengan ozon. Pelbagai analisis cirian fizikal, kimia dan mikrobiologi telah dilakukan ke
atas sampel air sebelum dan selepas dirawat dengan ozon. Hasil analisis
menunjukkan bahawa rawatan ozon tidak mengakibatkan perubahan kepada cirian
fizikal seperti nilai pH, kekonduksian dan kekeruhan tetapi membawa kesan
terhadap cirian kimia seperti kepekatan nitrat, keliatan keseluruhan, keliatan
kalsium, kepekatan Fe(II) dan Fe(III). Ozon didapati sangat berkesan untuk menukarkan ion ferus kepada
ferik dan berjaya menghapuskan koliform feses yang merupakan satu masalah
penting tentang kebersihan air yang dihadapi oleh kebanyakan negara membangun. Hasil kajian ini menunjukkan bilangan koliform feses dalam air dapat di
kurangkan secara berkesan dengan rawatan ozon, ia itu nilai p untuk sampel air
minumam dari paip air, batu spout dan perigi tuib adalah 0.00182, 0.026 dan 5.8
×10-15, masing-masing pada aras tekal bernilai 0.05.
Kata
kunci: Nyahcas dielektrik berpenghadan; ozon; perawatan air
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*Pengarang
untuk surat-menyurat; email:cswong@um.edu.my
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