improving particles separation after moving bed biofilm ... · pdf fileimproving particles...
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Improving particles separation afterImproving particles separation afterMoving Bed Biofilm Reactor (MBBR)Moving Bed Biofilm Reactor (MBBR)
systems by Media Clarifiersystems by Media Clarifier
N. Assulin*, K. Nof*, Y. Galer*, R. César Garza Carreón*
* Aqwise – Wise Water Technologies Ltd., Israel
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IntroductionIntroduction
Motivation
Operation principle
Design Guidelines
Results from Full-scale plant
Summary
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MotivationMotivation
Separation of biomass from pure MBBRs is morechallenging compared to Conventional ActivatedSludge systems
Conventional separation systems: gravitysedimentation, flotation and membrane separation:
Settling tanks: high footprint
Flotation and membrane systems: high operation andmaintenance costs
Coagulants and flocculants requirements
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The Solution: Media ClarifierThe Solution: Media Clarifier
Media Clarifier (MC) as separation unit after MBBRsThe MC integrates clarifier and a plastic media layer
MC advantages:
Small foot-print compared to conventional clarifiers (saveabout 65%)
Simple operation
No coagulant and flocculants requirements
No scum problems
Lower energy consumption
Flat floor
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Operation Principle (Operation Principle (11))
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S.A. 270 m2/m3
1. Inlet pipe from MBBR2. Effluent canal3. Carriers4. Screen5. Upper drainage pipe6. Diffusers7. Sludge drainage pipe
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Operation Principle (Operation Principle (22))
Sedimentation and solids separation occurs in thesame tank with an up-flow pattern
Inlet flow – in the bottom of the tank
Outlet flow – in the upper part
The upper zone removing solids thatdidn’t settle within the lower zone:
1) Separated by a coarse screen
2) Filled with immobile layer of carriers
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Operation Principle (Operation Principle (33))
The coarse solids settled at the lower zone areremoved by a drainage valve which operatesintermediately.
The fine solids which have been entrapped within thecarriers, require periodic removal to prevent clogging.
Periodical air-scour - next slide
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Operation Principle (Operation Principle (44))
Periodical air-scour is performed by diffusers installedin two positions:
Below the screen andOn the bottom of the MC
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Design GuidelinesDesign Guidelines
Hydraulic load: 1.4 m3/m2/h
Max. TSS inlet should be between: 700-800 mg/l.
Min. clarifier depth: 2.5m
Media depth: 0.8m (0.7m for small units
and compact units)
Effluent TSS: <30 mg/l, without polymers.
Sludge concentration out of the MC: 1-2%
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FullFull--Scale Plant in Israel (Scale Plant in Israel (11))
Plant location: Israel
Design parameters:
Flow rate: 600 m3/d
TSS concentration: 117 mg/l
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(2012)
Results (Results (11))
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Results (Results (11))
Although the influent SS concentrations are muchhigher than the designed values
The average effluent TSS concentration is ~ 10 mg/lwithout the use of coagulation/flocculation
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1414 Small Plants in Mexico (Small Plants in Mexico (22))
Plants location: Mexico
Design parameters:
Flow rate: up to 170 m3/d
HonigwelHonigwel oror telmecstelmecs
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Results (Results (22))
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Results (Results (22))
The average effluent TSS concentration is ~ 15.5mg/l without the use of coagulation/flocculation
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Questions?Questions?