SANEPAR Curitiba – Brazil
description
Transcript of SANEPAR Curitiba – Brazil
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Content
1. About Primozone
2. Ozone for filamentous sludge treatment
3. Ozone for reduction of pharmaceutical residues
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About PrimozoneFounded in 2000, SwedenIndustrial owner Westfal-Larsen Technology, NorwayFirst ozone installation in 2006 - now in 25+ countries on 5 continentsExperienced ozone provider – designs complete ozone solutionsR&D and production in-houseISO 9001 & 14001 certified
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A: Lund University, Water & Environmental TechnologyB: Primozone Production ABC: NSVAD: Aalborg University, Biotechnology
Filip NilssonA,B, Marinette HagmanC, Artur Tomasz MielczarekD
Per Halkjær NielsenD & Karin JönssonA
Application of Ozone in Full-Scale to Reduce Filamentous Bulking Sludge at Öresundsverket WWTP
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Bulking sludge is very common at WWTPs using activated sludge.Usual culprits in municipal WWTPs: Microthrix parvicella, Curvibacter and phyla TM7.Can cause:• Reduced settling• Decreased capacity• Reduced solids retention• Increased costs
Introduction
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Possible to remedy with:• Changing process parameters• Non-specific methods such as Ozone or PAX
However, care must be taken to safeguard the biological processes with either approach
Introduction
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Öresundsverket WWTP
• Commissioned in 1974, Helsingborg, Sweden
• Not uncommon with DSVI > 200 ml/g
• Designed for 220 000 PE (150 000 PE in 2012)
• Flow 70 000 m3/day or 1.85 MGD
• Largest Bio-P (EBPR) plant in Sweden
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Courtesy of: Salar Haghighatafshar, Lund University, SVU Report
• UCT Process, EBPR
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Anaerobic
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Aerobic
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Aim
Reduce the DSVI down to manageable levels with ozone in full-scale
Gain information on the bacterial population subjected to ozone treatment
Observe the Bio-P and nitrification processes during ozonation
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Full-Scale Ozone System
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Sampling
Operating parameters:• DSVI• VSS• Nitrification rate• Biological phosphorus release rate
Samples for Q-FISH and light microscopyAdditional samples:
• NH4-N• NO3-N• Total N• Total P
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Key Figures
• In operation for 45 days
• Ozone production 900 g O3 / hr
• Ozone concentration 200 g O3/Nm3 (13% wt)
• Ozone dose 2.8-5.0 g O3/kg SS
• 42 m3 return sludge / hr, ~5% (185 GPM)• ~11 minutes HRT @ 1.1-1.2 bar• 8 days production stop
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DSVI
-40 -35 -30 -25 -20 -15 -10 -5 0 5 10 15 20 25 30 35 40 45 5080
100
120
140
160
180
200
220Reference lineOzone line
Days into the study
DSV
I (m
l/g)
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Anaerobic
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Aerobic
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0 5 10 15 20 25 30 35 40 45 501
1.5
2
2.5
3
3.5
4
4.5
5
Reference lineOzone line
Days into the study
Nitr
ifica
tion
rate
(mg
NH
4-N
/g V
SS*h
)Nitrification Rate
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0 5 10 15 20 25 30 35 40 45 500
2
4
6
8
10
12
0
2
4
6
8
10
12
14
16
18
Reference lineOzone lineTemp
Days into the study
Phos
phor
us re
leas
e ra
te (m
g PO
4-P/
g VS
S*h)
⁰C
Bio-P
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Conclusions
• The application of 2.8-5.0 g O3/kg SS in the return sludge can significantly reduce the DSVI of activated sludge.
• No adverse effect on neither Bio-P nor nitrification rate could be discerned.
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2. Ozone for reduction of pharmaceutical residues
Where do pharmaceuticals come from?Why is it a problem?Ozone and pharmaceuticalsPilot-scale results
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Pharmaceuticals found in wastewater
Type ExamplesPainkillers Codeine, Tramadol,
DiclofenacAnti-convulsant Carbamazepine
Anti depressants Citalopram, Bupropion
Anxiety repression Oxazepam
Heart disease Metoprolol, Irbesartran
Antibiotics Trimetoprim, Sulfomethoxazole
Estrogen Levonorgestrel
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Where do they come from?A large portion of the pharmaceuticals used in society ends up at wastewater treatment plants (WWTP).
•Individuals•Hospitals•Manufacturing•And others
Most of those are not removed at the WWTP and ends up in the discharge.From there it´s only a matter of time before they end up in the waterways.
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Why is it a problem?
Stable compounds (lingers in the water)Interactions with wildlifeCombinatory effects (pharmaceutical cocktail)Eventually they end up in the human biosphere again.
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Ozone and Pharmaceuticals
Ozone attacks electronegative areas and breaks up the molecule into smaller pieces.
The resulting compounds are much more biodegradable in sand filters and the like.
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Pilot-scale experiment
Lundåkraverket WWTP 2012, Landskrona, Sweden
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Pilot-scale experiment
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Results of pilot-scale test
Ozone dose (g/m3)
Reduction (%)
Ozone before filter 10µm
Ozone after filter 10µm
2 10% 48%
5 80% 95%
9 88% 97%
• 24/46 compounds were found consistently
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Thank you!