SANEPAR Curitiba – Brazil

Presented by: Erik Marnung Sales Manager Industry

erik.marnung@primozone.com

Content

1. About Primozone

2. Ozone for filamentous sludge treatment

3. Ozone for reduction of pharmaceutical residues

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

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

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

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

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

Courtesy of: Salar Haghighatafshar, Lund University, SVU Report

• UCT Process, EBPR

Anaerobic

Aerobic

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

Full-Scale Ozone System

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

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

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)

Anaerobic

Aerobic

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

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

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.

2. Ozone for reduction of pharmaceutical residues

Where do pharmaceuticals come from?Why is it a problem?Ozone and pharmaceuticalsPilot-scale results

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

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.

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.

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.

Pilot-scale experiment

Lundåkraverket WWTP 2012, Landskrona, Sweden

Pilot-scale experiment

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

Thank you!