2005 New Technology from Ministry
of Environment
DOF (Dissolved Ozone Flotation)
Technology in Water and
Wastewater Treatment
University of Ulsan
Prof. Byoung Ho Lee
bhlee @ ulsan.ac.kr
DOF (Dissolved Ozone Flotation) System
DOF = DAF + Ozone
Excellent Separation
Strong Oxidation
SS, Turbidity
Disinfection of Virus, Bacteria
T-P
Removal of Color, Odor,
Taste
Algae
etc.
Removal of BOD, COD
Hazardous Wastes
1. DAF (Dissolved Air Flotation) System
Theory (Straining of Particles)
(a)
(b)
(a) Enlarged bubbles in bubble layer
(b) A unit cluster with three bubbles
(c) A unit cluster with four bubbles
(c)
DAF Pilot Plant (Lab Scale)
DAF Field Application (B Water Plant)
DAF Field Application (B Water Plant)
DAF Field Application (B Water Plant)
DAF Field Application (B Water Plant)
Effluent from DAF and
Sedimentation Basin(B Water Plant)
Sedimentation
DAF Effluent
Comparison between DAF and
Sedimentation
2. DOF system
DOF Pilot Plant (200m3/day)
Front Side
Back Side
Renovation by DOF System
Conventional System
Renovation
Renovated System by DOF
Secondary Wastewater Effluent Treatment by DOF
Ozone Dose: 1.98 mg/L
Ozone Dose: 3.28 mg/L
Effluen Remov.
t
(%)
Ozone Dose: 5.56 mg/L
Influe
nt
Effluen
t
Remov.
(%)
Influe
nt
SS (㎎/ℓ)
6.9
3.0
57.2
4.0
2.4
40.0
6.0
2.7
55.6
UV-254 (ABS)
0.145
0.044
69.9
0.117
0.038
67.5
0.155
0.049
68.4
BOD (㎎/ℓ)
9.5
1.4
84.9
4.9
1.2
74.8
9.5
2.1
77.8
CODMn (㎎/ℓ)
10.7
6.5
39.6
8.9
6.2
30.1
11.0
6.3
42.4
Color (CU)
24.7
4.3
82.4
20.7
3.7
82.3
26.3
5.0
81.0
T-N (㎎/ℓ)
8.497
7.230
14.9
5.793
4.103
29.2
8.573
7.630
11.0
T-P (㎎/ℓ)
0.39
0.04
89.7
0.46
0.05
87.9
0.34
0.07
78.6
Coliform
Bac.(MPN/mℓ)
193
0
100
313
0
100
270
0
100
HTP
Bac.(CFU/mℓ)
6,933
20
99.7
7,433
41
99.4
33,467
42
99.9
Influen
t
Effluen Remov.
t
(%)
Secondary Wastewater Effluent Treatment by DOF
UV-254
10
0.20
8
0.16
6
0.12
[ABS]
[mg/L]
SS
4
0.08
2
0.04
0
0.00
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30
Influent
Effluent(DOF)
DAF
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30
Influent
Efflunet(DOF)
DAF
Secondary Wastewater Effluent Treatment by DOF
BOD
CODCr
20
50
16
[mg/L]
40
30
12
8
20
4
10
0
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30
Influent
Effluent(DOF)
DAF
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30
Influent
Effluent(DOF)
DAF
Secondary Wastewater Effluent Treatment by DOF
T-N
T-P
2.50
14.0
12.0
2.00
[mg/L]
[mg/L]
10.0
1.50
1.00
8.0
6.0
4.0
0.50
2.0
0.00
0.0
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30
Influent
Effluent(DOF)
DAF
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30
Influent
Effluent(DOF)
DAF
Secondary Wastewater Effluent Treatment by DOF
5.0
Color
Turbidit
y
35
30
4.0
3.0
[CU]
[NTU]
25
2.0
20
15
10
1.0
5
0
0.0
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30
Influent
Effluent(DOF)
DAF
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30
Influent
Effluent(DOF)
DAF
Secondary Wastewater Effluent Treatment by DOF
1000
900
800
700
600
500
400
300
200
100
0
Heterotrophic bacteria
100000
80000
[CFU/mL]
[MPN/mL]
Coliform bacteria
60000
40000
20000
0
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24
Influent
Effluent(DOF)
DAF
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24
Influent
Effluent(DOF)
DAF
3. PO2 system
Dye Wastewater Treatment by PO2
system
(Raw Water: Secondary Wastewater Effluent of S Chemical Company
(b)
(a)
<Removal of (a)CODcr, (b)Color by PO2 System>
Pigment Wastewater Treatment by
PO2 Technology
(원수 성상별 오존 접촉에 의한 색도 제거 효과 비교)
5minutes contact
Raw
water
Effluent
of 1st
Biologica
l System
Effluent
of 2nd
Biologica
l System
10minutes contact
15minutes contact
Dye Wastewater Treatment by PO2
Raw Water 498(CU)
5ppm 150(CU)
6ppm 112(CU)
8ppm 72(CU)
14ppm 35(CU)
4. DOF-PO2 system
4. DOF-PO2 system (Pig Wastewater Treatment)
ㅇCapacity: 120ton/day (20hr/day)
ㅇ Size: 4.0M X 3.5M
ㅇOzone generation : Using Oxygen generator ㅇSite : Chung Nam
ㅇCOD Influent 484.9-Effluent 86.0 (RR: 82.5%), SS Influent 392.5 - Effluent39.4 (RR 90%)
Livestock Wastewater Treatment
by DOF-PO2 System
item
Raw
water
(mg/L)
Effluent
(mg/L)
Removal
Rate
(%)
CODMn
619.9
63.0
89.8
SS
409
22
94.7
T-P
27.04
0.35
98.7
Color
850(CU)
42(CU)
95.1
HTP
U.C
0
100.0
* Operation DATA
Night Soil Wastewater Treatment
Using DOF-PO2 System
item
Raw
water
(mg/L)
Effluent
(mg/L)
Removal
Rate
(%)
CODMn
250
34
86.4
SS
256.7
6.2
97.6
color
(CU)
666
20
97.0
HTP
UC
0
100.0
* Operating DATA
Raw Water
Coagulation
DOF Effluent
Livestock Wastewater Treatment
Using DOF-PO2 System
 Influent Concentrations
Parameter
pH
SS
CODMn
T-N
T-P
(㎎/ℓ) (㎎/ℓ) (㎎/ℓ) (㎎/ℓ)
Average
8.2
1503.9 1,202.2
112.1
97.8
CODMn by DOF-PO2
Infuent
Effluent
Removal rates
100
2,000
90
80
1,500
70
60
50
1,000
40
30
500
20
10
0
0
06-1-17
06-2-2
06-2-22
06-5-9
Date
06-5-24
06-6-8
06-6-19
Removal rate (%)
Concentration (㎎/ℓ)
2,500
SS by DOF-PO2
100
3,000
80
I n flu e n t
Efflu e n t
R e mo val r at e s
60
2,000
40
1,000
0
06-1-20 06-2-15 06-5-3 06-5-17 06-5-30 06-6-13
Date
20
0
Removal rate (%)
Concentration (㎎/ℓ)
4,000
T-N by DOF-PO2
I n flu e n t
Efflu e n t
Re mo val rate s
100
80
120
60
80
40
40
20
0
0
Concentration (㎎/ℓ)
160
06-1-17
06-1-20
06-1-26 06-2-3
Date
06-2-21
06-2-23
Removal rate (%)
200
T-P by DOF-PO2
100
250
I n flu e n t
Efflu e n t
Re mo val r ate
80
150
60
100
40
50
20
0
0
06-1-17
06-1-20
06-1-26
06-2-3
Date
06-2-20
06-2-22
Removal rate (%)
Concentration (㎎/ℓ)
200
Summary
Parameter
CODMn
(㎎/ℓ)
SS
(mg/l)
T-N
(㎎/ℓ)
T-P
(㎎/ℓ)
Influent
(average)
Effluent
(average)
Removal rate
(%)
1,202
226
81.1
1,504
49
92
112
32
67.7
97.8
4.2
94.6
5. Mechanisms of the DOF-PO2 Effects, Microbubbles
Ozone Bubbles
Oxidation & Coagulation
Standard Chemical Potentials
Oxidizer
Chemical
Potential
(Eo : volts)
At 4 (kg/cm2)
Eo (volts)
O3
2.07
8.28
Cl2
1.39
5.56
O2
1.27
5.08
Activation Energy Effect
High Concentration
of Ozone (8.28 volts)
Low Concentration
of Ozone (2.07 volts)
Bubble Volumes
Air
Ozone Gas
(mg/L) (mL/L) (mg/L) (mL/L)
Solubility
(20℃, 1atm)
24.31) 20.1 5702) 285.3
N2
O2
O2
O3
Volume ratio
(%)
78.1
21
93.3
6.7
N2
O2
O2
O3
Volume
(mL)
13.3
6.8
26.6
19.1
45.7
Total Micro Bubble
20.1
Volume (mL)
(25.6)
1) Wastewater treatment engineering (Met Calf & Eddy, 2003)
2) Solubility of 100% Ozone in pure water (Ullmann’s, 1991)
Released Bubble Volumes
Pressure
Air (ml/L)
Ozone (O3)
(ml/L)
1 atm
20.1
45.7
4 atm
80.4
182.8
Released
Micro-bubble
Volume (ml/L)
60.3
137.1
Advantages of the DOF System
• High Concentration of Ozone Provides High
Energy
• Providing High Volume of Gas
(Solubility of Ozone Gas>> Air)
• Many Functions in One Unit
• Compact System
4
기술 적용
위치도
4.1 1.
DOF
공정
공사개요
◐ 울산 회야하수처리장
● 사업 개요
 공 사 명 : 회야하수종말처리장 고도처리시설 설치공사
 발 주 처 : 울산광역시
 시설 용량 : 32,000톤/일
 사업 위치 : 울산광역시 울주군 웅촌면 대대리 808번지
 진행 상황 : 운영중 (2008년10월 준공)
DOF 설치동
26
4
기술 적용
위치도
4.1 1.
DOF
공정
공사개요
27
4
기술 적용
위치도
4.2 1.
DOF-PO2
공사개요
◐ 보령 가축폐수처리장
● 사업 개요
 공 사 명 : 보령시 축산폐수공공처리시설 건설공사 중 DOF 설비 설치공사
 발 주 처 : 보령시
 시설 용량 : 112톤/일
 사업 위치 : 충청남도 보령시 천북면 신죽리 890-3 보령축산폐수처리장 내
 진행 상황 : 설치완료 후 정상 운영중(2006년 02월 준공)
<원수>
< DOF 처리
수>
28
4
기술 적용
위치도
4.2 1.
DOF-PO2
공사개요
[ 보령가축분뇨폐수 처리 효율 ]
항목
유입수
(mg/L)
처리수
(mg/L)
처리율
(%)
CODMn
641
72
98.8
SS
411
10
97.6
T-P
126
49
61.1
색도
755
38
95.0
일반세균
무수히多
0
100.0
[ 포천가축분뇨폐수 처리 효율 ]
항목
유입수
(mg/L)
처리수
(mg/L)
처리율
(%)
CODMn
619.9
63.0
89.8
SS
409
22
94.7
T-P
27
0.35
98.7
색도
850
42
95.1
일반세균
무수히多
0
100.0
[ 원수/처리수 비교 ]
[ 원수/처리수 비교 ]
29
4
기술 적용
위치도
4.3 1.
DOF/DAF
공사개요
< 청도화양하수처리장 고도처리(DOF) >
< 평택청북하수처리장 재이용수 처리(DOF) >
< 진주정촌폐수처리장 고도처리(DOF) >
< 울산방어진정수처리장 고도처리(DAF) >
30
4
기술 적용
위치도
4.3 1.
DOF/DAF
공사개요
• 진주문산 하수처리장(DAF)
4
기술 적용
위치도
4.3 1.
DOF/DAF
공사개요
• 진주사봉 하수처리장(DAF)
4
기술 적용
위치도
4.3 1.
DOF/DAF
공사개요
• 파주월롱 첨단산업단지(DOF)
Thank You !