GEA Heat Exchangers / GEA 2H Water Technologies GmbH

Wastewater treatment by Biofilm technologyCompact Waste Water Treatment Unit

Pilot Project-Tunisia.

1

Dr.-Eng. Noama Shareef

GEA Heat Exchangers / GEA 2H Water Technologies GmbHJanuar 132

• Principles of municipal waste water treatment

• Biofilm technology for wastewater treatment

• Concept of a hybrid-plant for high Treatment Efficiency (compact- System) for full treatment

• Overview of the WWTP in Bent Saiden / Tunisia

• Process steps of the WWTP in Bent Saiden

• Conclusions / results

Summary

GEA Heat Exchangers / GEA 2H Water Technologies GmbHJanuar 133

Purification is performed by a Biofilm: Biofilm Systems: Bacteria is attached on support media

Biofilm technology for Wastewater Treatment

GEA Heat Exchangers / GEA 2H Water Technologies GmbH4

Overview of the WWTP in Bent Saiden / Tunisia

• Research project: Hybrid biofilm plant.• The pilot unit is supported by German Ministry

of Development and Research.

• 200 PE, Inflow 30-40m3/d, BOD 20kg/d

GEA Heat Exchangers / GEA 2H Water Technologies GmbH

Primary Sedimentation-Tank

Sedimentation Tank

Secondary Sedimentation Tank

De-nitrification C-Stage

Nitrification (N1-N3) Sludge TankOutlet

Inflow

Process steps of the WWTP in Bent Saiden

GEA Heat Exchangers / GEA 2H Water Technologies GmbHBest practice: MOFIX6

Concept –system of hybrid-plant

The conventional upstream denitrification process

Primary treatment (screen, settling)

Denitrification(anoxic conditions)

C/N Elimination(aerobic conditions)

Final settling

Sludge recycle

Internalrecycle

The compact-system process

Primary treatment (screen, settling)

Denitrification(anoxic Moving bed)

C/N Elimination(aerobic fixed bed)

Final settling with

Internalrecycle

Intermediate settling

GEA Heat Exchangers / GEA 2H Water Technologies GmbH

denitrificationBOD removal settling Nitrifikation settling

recycle

Concept - system of hybrid-plant

Concept - system of hybrid-plant

GEA Heat Exchangers / GEA 2H Water Technologies GmbH

Demonstration of Deni- stage in WWTP-Tunis

+

836m²/m³BCN 09

Spicall Mixer

C-Stage

DeNi

Separation Screening sheet

Mixer

Inflow

Recerculation line Air supply

outet to intermedia sedimentation tank

• For de-nitrification reactor a specific density above 1 kg/l should be applied.• A special shaped mixing device must be tested and applied because agitator

of moving bed system with propeller shaped mixers often leads to the damage of carriers.

Layout of Denitrification and C-removal stages

GEA Heat Exchangers / GEA 2H Water Technologies GmbHText über "Einfügen Kopf- u. Fußzeile" einfügen9

Moving bed for De-nitrification -Stage

GEA Heat Exchangers / GEA 2H Water Technologies GmbHJanuar 1310

Fixed Bed Reactor with BIOdek® for Nitrification

GEA Heat Exchangers / GEA 2H Water Technologies GmbHText über "Einfügen Kopf- u. Fußzeile" einfügen11

Nitrification in 3 phases

GEA Heat Exchangers / GEA 2H Water Technologies GmbH

Aeration device for Nitrification Stage

GEA Heat Exchangers / GEA 2H Water Technologies GmbH

Conclusions / results

Removal rates (%) during 80 day start-up period (without process optimization)

Mo/Fix-Hybrid® - Data & results pilot plant

GEA Heat Exchangers / GEA 2H Water Technologies GmbHText über "Einfügen Kopf- u. Fußzeile" einfügen14

Conclusions / results

Treatment of BOD in the WWTP

Treatment of N in the WWTP

GEA Heat Exchangers / GEA 2H Water Technologies GmbH15

Conclusions / results - Compact System

Best practice: MOFIX

Activated sludge

Tank (m³)

MOFIX

Tank (m³)

MOFIX

Media (m³)

MOFIX

Media (Type)

Denitrification 714 75 37,5 BCN 14Carbon removal

127 80 KVP 623

Interm. Settling 143 30 FS41.84Nitrification 714 444 333 KVP 618Final settling 263 57 11 FS41.50Total volume 1691 846 492

Comparison between activated sludge and compact-system design

GEA Heat Exchangers / GEA 2H Water Technologies GmbHJanuar 1316

• Compact-System (Mofix) is a wastewater treatment process designed for highest standards, reliable and easy to operate.

• The effluent concentrations of MOFIX treated municipal wastewater comply with highest German and European standards for BOD, COD, NH4-N and NO3-N

• The treated wastewater by compact system MOfix (BOD5≤10 mg/l, COD ≤100 mg/l, TSS: ≤25 mg/l, NH4-: ≤2 mgN/l, NO3≤10 mgN/l) can be reused for irrigation after disinfection or discharged to the Water bodies

• The generated excess sludge can be exposed for drying in sludge drying beds which can be built in the proximity of the unit. And reuse it for Agriculture.

Conclusions / results - Compact System

GEA Heat Exchangers / GEA 2H Water Technologies GmbHJanuar 1317

Thank you very much for your attention

GEA Heat Exchangers / GEA 2H Water Technologies GmbH18

Demonstration of Deni- stage in WWTP-Tunis

• (1) mixing device (slow motion)

• (2) moving bed carrier (max 50% filling)

• (3) baffle

• (4) screen (30 m/h)

• (5) diffusors

Structure of a moving bed

Best practice: MOFIX

GEA Heat Exchangers / GEA 2H Water Technologies GmbH3

Screening

AgitatorDenitrification reactor

BOD removal fixed bed

Intermediate clarifier

Nitrification in 3 phases (fixed bed)

Final clarification Recirculation

Sludge thickener

Overview in 3-D of the WWTP

GEA Heat Exchangers / GEA 2H Water Technologies GmbH20

Biological waste water treatment

It is a type of waste water treatment in which microorganisms such as bacteria are used to remove pollutants from waste water through biological stag,

Wastewater treatment means:removal of pollutants like solids, organic matters i.e. BOD-load and

inorganic matter (nitrogen, phosphorous, Heavy metals etc.).

• BOD removal

• Nitrification

• De-nitrification

Aims of waste water treatment