o2 applications in water & waste water...

O2 applications in Water &

Waste Water Treatment

National Seminar "Wastewater Treatment“

Starosel, Bulgaria

September 29th, 2016

Nevio Corna

[email protected]

National Seminar "Wastewater Treatment”

Starosel – September 29th, 2016 2

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SIAD – O2 pipelines for WWT



Pure O2 Technologies in Water Treatment

O2 use in biological waste water treatment

O2 for ozone production

• COD, surfactants, color removal

• Improvement on BOD/COD ratio

• Disinfection, micro-pollutants

Sludge treatment / minimization

• Ozonolysis

• Aerobic digestion

O2 for bioremediation of contaminate sites

O2 enhanced thermal treatment (incineration)

Supercritical Water Oxidation



The Oxygen role in water treatment

Biological reactor

Secondary

clarifier

Tertiary

treatment

Aerobic

digestion

Primary

clarifier



Oxygen transfer

In order to perform the biological process of organics absorption, the biomass needs

OXYGEN to breath

Biomass can adsorb O2 only if it’s dissolved in water, not from gas bubbles.

AIR

It is necessary to transfer O2 inside the biological treatment basin

Pure O2

O2

D.O.

Also microorganisms needs to

breath



Why air has low O2 efficiency transfer?

Low concentration of O2 in AIR (21%)

Short permanence time of the air bubbles in water

O2 stripping effect due to the presence of large amount of N2

This lead to a poor efficiency of O2 mass transfer

only 10 ÷ 20% of O2 is dissolved in field conditions

Reduce the possibility to obtain high concentration of dissolved O2

typically no more than to 2 mg/l (ppm)

A low D.O. level prevents the sludge floc to be completed saturated

The floc is not completely active

the part of biomass not saturated with oxygen is “useless”



Benefits in pure Oxygen use

Increase plant treatment capacity

Easy adaption to load peaks

Low specific excess sludge production

Low electrical consumption

No aerosol and bad smells

Easy to adopt in existing basins

More than 500 units installed



SIAD solution The MIXFLO® system

Progetto”ICE” in mattoni di geo-brik by Accademia Belle Arti di Milano



The MIXFLO® system – Main components (1)

Progetto”ICE” in mattoni di geo-brik by Accademia Belle Arti di Milano

Centrifugal pump for mixed liquor pressurization (external or submersible)

Tubular oxygenator (plug flow reactor to obtain a “monophase” )



The MIXFLO® system – Main components (2)

Liquid-liquid eductor(s)

High O2 transfer efficiency > 95%

Power requirement: 0,2 ÷ 0,4 kWh/kgO2 (really transferred)

Mixing of the basin



The MIXFLO® system: external plants



The MIXFLO® system: submersible skids



Alternative O2 injection systems



Pure Oxygen applications

Upgrading of existing air systems

Seasonal WWTPs fruits and vegetables

dairy industries

sweets / ice creams

soft drinks

wineries

distilleries

sugar refineries

touristic towns

High load chemical/petrochemical

pharmaceutical

pulp & paper

landfill leachate treatment

biodiesel

food industry

slaughterhouses

meat processing

syrups / creams



LAB SCALE TESTS:

- Biological tests: Activated sludge, biofilm carriers

(MBBR), membrane (MBR) – respirometry

- Chemical or chemical / physical tests: pollutant

removal with ozone or AOP, phosphorous removal,

pH correction, activated carbon, etc.

GOAL

• Support service to customers

• Feasibility of the processes with indication of:

Inlet & outlet pollutant concentration

Pollutant removal performances

• Support to customers for plant operation

SIAD Lab – Feasibility studies and lab tests



Industrial Pilot Plants

o2 applications in water & waste water...

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