Performance of energy-saving water exchange device used in tidal wetland to improve water quality 1....
-
Upload
ezra-lynch -
Category
Documents
-
view
221 -
download
1
Transcript of Performance of energy-saving water exchange device used in tidal wetland to improve water quality 1....
Performance of energy-saving water exchange device used in tidal wetland to improve water quality
1. Associate Professor, Department of Bioenvironmental Systems Engineering. National Taiwan University, Taiwan2. Corresponding Author, Ph.D Candidate. Department of Bioenvironmental Systems Engineering. National Taiwan
University, Taiwan ([email protected])3. Research Fellow, Biodiversity Research Center, Academia ,Taiwan4. Post Doc., Biodiversity Research Center, Academia ,Taiwan
Hou Wen-Shang 1, Teng Te-Hui* 2, Hsieh Hwey-Lian 3, Chen Chang-Po 3 and Huang Shou-Chung 4Geophysical Research AbstractsVol. 13, EGU2011-10155-4, 2011EGU General Assembly 2011© Author(s) 2011
Abstracts In natural waters, the stratification will happen to environmental conditions changes such as surface velocity, water temperature, depth, and dissolved oxygen. When the water depth closed to the sediment, water quality was usually present in inferior situation. Aerators, use to enhance water quality in lakes and reservoirs recent year is a physical purification without add chemical agents (for example: Alum) and the makeup water will not produce harmful substances. Aeration tally with the environment friendly concept of dealing with corrupt water and has good economic returns and improving efficiency. Continuous type aerator has a characteristic that consumes higher energy and cause the massive water bodies becoming turbulence under high-power motor operate. Turbulence will break the stratification fast and elevate dissolved oxygen. Under mixing action in the water will disturb original fish and the algae perches in different depth. Hwa-Chiang waterfowl habitat is located in the heart of Taipei. Its core area, Taipei City Waterfowl Reservation, is one of internationally important tidal wetlands and has been designated as important bird area. However, the wetland has faced urban water pollution. This study focus on ecological conditions of the Hwa-Chiang waterfowl habitat used artificial tidal pond and Solar Energy Air-Lift Column (SEALC) to enhance water quality and habitat ecological biodiversity. SEALC is a water exchange device which consumes 3.5 watts motor continuous inject air into the air chamber, when the air chamber accumulate different amount of air with depths, and intermittent large bubble produced by buoyancy driven water exchange. Established long-term measurement data of environment conditions to monitor system efficient, parameters included dissolved oxygen (DO) distribution, sediment oxygen demand (SOD), ORP, velocity and water temperature. Operate conditions such as water exchange capacity, economic benefits and working efficiency will be discussed.
Waterfowl habitatTidal wetland
Sediment accumulation
HabitatDeterioration
Metro
po
lis sew
age F
oo
d
Def
icie
ncy
No Sediment Erosion
Not interrupt aquatic organism
Ecosystem protection
Green energy
Enhance water quality
Low turbulence
Principles of SEALC
for Waterfowl habitat
Tidal pond elevation diagram N 25˚02’16.8” E 21˚29’21.1”
Taipei city, Taiwan
Longterm monitored SOD value of Hwa-Chiang waterfowl habitat
0
5
10
15
20
25
30
3/11
/200
9
5/11
/200
9
7/11
/200
9
9/11
/200
9
11/1
1/20
09
1/11
/201
0
3/11
/201
0
5/11
/201
0
7/11
/201
0
9/11
/201
0
11/1
1/20
10
1/11
/201
1
SOD
( g
/ m
2 / d
)
Original After SEALC treated area
SPECIFICATIONS OF POWER SYSTEM
28.5*11.5*160.5ADC12V300 pondAir compressor
29*15*201.1ADC12VChallengeAir pump
-2VADC12VAnlyTimer
35*17*18-DC12VYUASABattery
Power system
29*15*201.1ADC12VChallengeAir pump
-2VADC12VAnlyTimer
20*17*17-DC12VYUASABattery
66*31*2MAX20WDC16.8VSUNTECHSolar board
Solar board system
L*W*H (cm)PowerVoltageBrand
Economic Analysis
609.7660
914.63100
350.6120
198.1712
137.26
76.223.5
Operating Cost ( $.)Electricity power (Watt)
1. The price not includes solar board.
2. Exchange rate is 1 US. Dollar = 32.8 NT. Dollar
3. In Taiwan 1 kw*Hr electricity costs 2.6 NT. Dollar.
SUITABLE POWER USE SUGGESTIONWater depth (m) Ⅰ Ⅱ Ⅵ
≦1 3.5w 3.5w 3.5w>1~3 3.5w 3.5w 6w>3~10 6w 6w 6w>10~20 12w 12w 12w>20~30 60w 60w 60w>30 >60w >60w >60w
Result
Flow fieldMethod
1.0Water depth (m)
78.5area (m2)
10.0Diameter (m)
Water diffusion
1.56±0.04SAE (kgO2/hr/kw)
(3.37±0.12)×10-3SOTR (kgO2/hr)Standard Aeration Efficiency
3.6~22.2Intermittent time (Sec)
178.8Water capacity per NT. (max)
0.016Electricity consumption per NT.
0.006Electricity consumption ( kw / hr)
13000Cost (NT.)
Time
¤ô
¦ì
-1.5
-1.0
-0.5
0.0
0.5
1.0
1.5
DO
(pp
m)
0
1
2
3
4
5
´éª@¬W¥X¤ô¤f DO (ppm)¼é¦Á ¶Z´éª@¬W1M¤ô ±¤U10¢QDO¶Z´éª@¬W5M¤ô ±¤U10¢QDO
2010/1/15 2010/1/16 2010/1/17 2010/1/18
Dissovled Oxygen of Hwa-Chiang waterfowl habitatLongterm monitored ORP value of Hwa-Chiang waterfowl habitat