EGIS, CREATIVE FOR THE LONG TERM JULY 2015 1

Nov 19, 2015

ODOR CONTROL IN SEWERAGE SYSTEM

© Artefacto / Intrépide Productions - Arthur Chays

Methodological approaches and feedback experiencesLviv City

Hélène PIET, Egis

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Egis GROUP – Key Figures

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€854 M OF MANAGED TURNOVER

78 % ENGINEERING22 % ROAD & AIRPORT OPERATION

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53% OF SALES ABROAD

4%AMERICAS

47%FRANCE

(incl. French OverseasDepartments and Territories)

12%AFRICA

21%EUROPE

8%ASIA

1%AUSTRALIAOCEANIA

1% Ukraine

7%MIDDLEEAST

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12,000 EMPLOYEES

12,000 employeesTOTAL WORKFORCEON DECEMBER 31, 2014

4,200ROAD AND AIRPORT OPERATINGCOMPANIES STAFF

7,800 ENGINEERING DIVISION STAFF

4,100 FRANCE3,700 INTERNATIONAL

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EGIS UKRAINA. 20 YEARS OF CREATIVE WORK

55 employees

30 engineers

40 projects in Ukraine

and CISKey services:- feasibility study- mobility study- corporate development- technical support to the municipalities- construction supervision- project management

822 000 € – 2014 TURNOVER

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KEY FIELDS OF OPERATIONS IN UKRAINEUrban transport

Roads

Water

Energy

New tramway produced in Lviv for the LvivElectrotrans modernisation project led by EGIS

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PRE-DIAGNOSIS OF ODOR PROBLEMS IN THE SEWERAGE SYSTEM OF LVIV CITY

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CONTEXT

• Citizen’s complaints for bad smells• Lviv, tourist capital of Ukraine

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SCOPE OF WORK

• General and preliminary assessment of smell problem

• Define technical solutions or propose further investigations to understand smell problems

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MAIN OUTCOMES (1)

Odor complaints spread over a large area No systematic recording and follow-up regarding

these complaints Þ Implement an Odor tracking

system/service

• Find the origin• Warn LVK of any abnormal situation• Keep track of the evolution of odor situation

Chapitre

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MAIN OUTCOMES (2)

Sewerage system seems to be the main odors source in several districts

=> To implement an hydraulic diagnosis and technical solutions, on a case by case basis

WWTP and sludge deposit area have a large emissivity and could instigate complaints under specific wind conditions

=> To implement an olfactometric measurements campaign to identify main odor sources and prioritize technical solutions

Chapitre

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FIRST STEP / IMPLEMENTING AN ODOR TRACKING SYSTEM

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LVIV ODOR MAPChapitre

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EXEMPLE OF SIAAP - PARIS

(1) Report a complaint on the website : Odor statement

Date

Hour

Town

Adress

DurationLess than an hourA few hours1 to 2 daysSeveral days

Kind of smell

Level of annoyance

Level of Intensity

Remarks

I wand to be contacted :

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EXEMPLE OF SIAAP - PARIS

(2) In-field odor inspections

4 inspectors from SIAAP Daily patrols in-site and in the environment of

facilities Paths and check points determined on a weekly and

daily basis according : - Citizens complaints- Maintenance works- Trials and study about technical solutions or preventive

works to reduce odor emissions

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FOLLOW-UP OVER THE YEAR

Jan. Feb. March April May June July August Sept. Oct. Nov. Déc.

Year 2014

High H2S level at pumping station 4 Maintenance work on collector 6

Stopping the deodorization plant for maintenance

+ propitious weather conditions

 : Situation olfactive satisfaisante

 : Situation olfactive passable

 : Situation olfactive médiocre

 : Situation olfactive critique

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SEWERAGE SYTEM

Diagnosis and technical solutions on a case by case basis

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METHODOLOGICAL APPROACH

pressure pipe

gravity pipejunction chamber

vent1- Where does the odor come from ?

Residential area

Industrial collector

Industrial collector

Þ in-field odor inspectionsÞ H2S continuous monitoring

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METHODOLOGICAL APPROACH

pressure pipe

gravity pipejunction chamber

vent

Residential area

Industrial collector

Industrial collector

2- Understanding the causesMeasurements campaign of:water flow rate + H2S concentrations+ temperature, BOD5/COD, pH,

over an extended period of time

Retention time to check

Is the vent high enough ?

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METHODOLOGICAL APPROACH

pressure pipe

gravity pipejunction chamber

vent

Residential area

Industrial collector

Industrial collector

2- Understanding the causes

Hydraulics characteristics :Water flow rateWater velocity

Diameter changesSlopes changes

Turbulence, confluence of major tributary systemsManhole locations

Measurements campaign of:H2S concentrations in headspaceWater quality = Sulfates (SO4--), pH, dissolved and total sulfides, sewage temperature, BOD5/COD, suspended solid,Pressure in the headspace

Structural conditions of the collector

Failures inspections Maintenance man hole sealing

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HEADSPACE CONSTRICTIONChapitre

Downstream sewer cannot accept all of the upstream air

causing out venting off the sewerLowvelocity water pushes back on fast moving air causing a pressure

zone to form upstream

Hydraulic jumps can also constrict airspace causing

more backpressure

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CLASSICAL LIQUID PHASE TREATMENT (1)

Iron salts additionH2S curative application

Chapitre

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CLASSICAL LIQUID PHASE TREATMENT (2)

Calcium NitrateH2S preventive application

Chapitre

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OTHER INVESTIGATIONS / SOLUTIONSChapitre

Odor tracking system Control the proper design and hydraulics

characteristics Control the maintenance Control of wastewater entry - Industrial and non-

domestic waste water surveys, hauled waste station to implement

Inhibition of H2S (nitrate, oxygen injection…) Collection of air (gaz trap on rain gullies, ventilating

facilities) and treatment

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www.egis-group.com

Hélène PIET Arnaud DE RUGYA i r / O d o r E x p e r tRe g i o n a l M a n a g e r f o r

U k r a i n e a n d C I S

H e l e n e . p i e t @ e g i s . f r A rn a u d . D E R U GY @ e g i s . f r ,

Т e l .   + 3 8 0 4 4 2 4 6 6 4 4 8   

CONTACT

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Chapitre