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Design and application of
new type of oxygen supplier for water and wastewater
treatment
Mongkol Jongsuphaphong and Suntud Sirianuntapiboon*
Department of Environmental Technology, School of Energy and
Materials, King Mongkut's University of Technology Thonburi,
Bangmod, Thung-kru, Bangkok 10140, Thailand.
*Corresponding author. E-mail:
suntud.sir@kmutt.ac.th.
Tel: 662-470-8656. Fax: 662-4279062 or 662-470-8660.
Accepted
15 August, 2008 |
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A new oxygen supplier was designed to
inject both ozone and air into the water under high
pressure. The oxygen transfer coefficient (KLa)
of the system with air and ozone were 0.0264 and 0.4900,
respectively. The oxygen transfer efficiencies of the system
with ozone and air were 73.58 and 52.17%, respectively. The
system could be applied to increase the dissolved oxygen
(DO) in domestic wastewater. DO of the wastewater from
septic tank was increased from 0.0 to 4.9 ± 0.5 mg/L within
1.6 h by the system with air injection and up to 8.0 ± 0.5
mg/L within 1.6 h with ozone injection. The system with
ozone injection could reduce the COD and BOD5 by
54.6 ± 3.5 and 50.9 ± 3.4%, respectively, by increasing the
DO. The system could be also be applied into shrimp ponds to
increase DO. The DO of the water was increased from 2.5 to
4.3 ± 0.5 and 6.1 ± 0.7 mg/L within 20 and 80 min,
respectively, by the system with ozone injection. Also, the
system could reduce the organic matter during operation. The
COD and BOD5 were reduced by 81.2 ± 1.2% and 57.1
± 3.0%, respectively, within 1.6 h by the system with ozone
injection.
Key words:
Aeration, dissolved oxygen, high pressure, ozonizer, plasma. |
