How to treat the secondary effluent from petrochemical waste water through O3-BAF process

1. Title:
Treatment of secondary effluent
from a petrochemical wastewater
treatment plant by ozonation-
biological aerated filter (O3-BAF)
Name :Sazzad Khan
ID: 1731706

2. Authors ChangyongWu, PhD
Researcher , Research Center
of Water PollutionControl
Technology, Beijin Chaina
Yuexi Zhou, PhD
Researcher, Research Center
of Water PollutionControl
Technology, Beijin Chaina
Zhen Gao, Phd
Researcher, Research
Center of Water Pollution
ControlTechnology
Mingguo Liu,
Researcher, Research
Center of Water
Pollution Control
Technology
YinYua , PhD
Researcher, Research
Center of Water
Pollution Control
Technology, Beijin
Chaina

3. Contents
Introduction
Objectives of the
research
Methodology
Results
Discussion
Conclusion
Opinion

4. Introduction
 Waste water : originates from a domestic , industrial,
commercial, agricultural activities, surface runoff or storm
water and sewage
 Petrochemical (ethylene, propylene, benzene, toluene,
methane , ethane) be made from oil, natural gas, coal or other
sources.
 China : Annual discharge of industrial wastewater is 2.1 × 10^10
ton. Mostly used centralized wastewater treatment ( old
standards).
 Secondary effluent treatment: removal of biodegradable
dissolved and colloidal organic matter , and involves biological
process ( coverts organic contaminants – biomass,CO2
H2O,NH3)
 How secondary effluent collected from a petrochemical
wastewater treatment plant can be treated by ozone–
biological aerated filter (O3-BAF) ?

5. Objectives of
the Research
 To develop and introduce an advanced treatment
technology for biological industrial effluent
(secondary effluent) by ozonation process
 To find an innovative solution to reduce the cost
 To increase the biodegradability as well as reduce
the genotoxicity of petrochemical secondary
effluent
 To find out whether or not the O3 –BAF process is
suitable for the advanced treatment of
petrochemical secondary effluent.

6. Methodology
1. Experimental Setup
 One ozonation reactor
a) Ozone generator
b) Contact reactor
c) Ozone detector
d) Gas absorption device
 Two Biological aerated filter (BAF)
#1 BAF ( fed with ozonation effluent)
#2 BAF ( fed with petrochemical secondary effluent)
Source:https://www.google.com/search?q=ozone+reactor&newwindow=1&
source

7. BAFStructure
Source: http://www.watermaxim.co.uk/biological-aerated-filter.php
https://www.atomic-reactor.co.uk/product/atomic-ozone-reactor-300-1000-lt

8. 2.
Experimental
Procedure:
 Secondary effluent are incubated with BAF (1
&2) for 20days
 Secondary effluent changes to ozonation
effluent within 21 days (BAF #1) & transfer
 Ozone stripping tank: Remove the residual
dissolved ozone
 Sample collection period: 1 day
 Immediately transported to laboratory for
analysis

9. 3.Analytical
Method
a) Molecular size distribution (MSD)
• Ultrafiltration method using different pore size
membranes
• Water samples are filtered by a 0.45 μm cellulose acetate
membrane
• Measured dissolved organic carbon (DOC )
b) Gas chromatography–mass spectrometry (GC–MS)
 used for organics analysis
c)Three-dimensional fluorescence scan (wavelength 200–
500 nm)
 d) Genotoxicity measurement: sos/umu test based on
Salmonella thyphimurim

10. Results:
1. Ozonation can degrade organics into simpler compounds which
can be biodegraded in a bioprocess
2.The contact time and ozone dosage of the ozonation unit is
determined as 4 min and 10 mg L-1.
DOC removes by O3-BAF is approximately 9 mg L−1
3.The ozone utilization rate is higher than 79%
5. More than 85% of the genotoxicity of the chemical secondary
effluent was removed in the ozonation unit

11. AverageDOC(secondary
effluent)=23mgL−1
Ozonationeffluent=20mg
L−1.
#1BAF=14mgL−1.
#2BAF=21 mgL−1
Figure : DOC removal characteristics in the O3 –BAF process (#1
BAF feed with ozonation effluent and #2 BAF feed with
secondary effluent).

12. Discussion
1. ozonation changed the percentage of the small molecular size
organics (< 1 k) increasing from54% to 67%, and the high molecular
size organics (> 100 k) decreasing from26% to 8%.
2. 37% DOC is removed by ozonation and 63% is removed by BAF (
Total 63%+37%= 100% )
3. BOD5/COD of the ozonation effluent has the highest value of 0.15
under this condition (less than 0.06 in untreated secondary
effluent).
4. GC-MS result shows that approximately 169 types of organics can
be detected in the secondary effluent, most of which (more than
85%) are unsaturated bond or aromatic organics, such as aniline,
acetophenone, nitrobenzene, nitrochlorobenzene, styrene etc

13. Conclusion
 Ozonation can change the organics molecular size, increase the
biodegradability
 Reduce the genotoxicity of petrochemical secondary effluent.
 The O3 –BAF process is suitable for the advanced treatment of
petrochemical secondary effluent.

14. MyOpinion:
The process is very effective only in treating secondary effluent that
are organic matters ( soluble and colloidal) . In my opinion, I think
this technology needs some improvements like the process called
Photocatalytic degradation
- A process that potentially mineralizes all of the organic and
inorganic components typically found in the refinery effluent to
environmentally benign by-products