1. HyVAB for a decentralised BF-MBR pilot

2. Content
Brief results so far
Transition
HyVAB!
Modeling (so far)
Time line ?

3. 1. So far- Possible BF-MBR configurations
Scenario No1:
Typical submerge MBR configuration would convert biofilm reactor to activated sludge reactor due to accumulation of retained biomass
Biofilm reactor
Scenario No2:
External submerge membrane reactor opens possibility to keep retained biomass separated from biofilm and provides stable i.e. designed bioreactor operation
Biofilm reactor

4. Solids reduction – MLSS reduction
1. Complete mixed reactor CM-MR – Recovery (R)!
2. Rector with sludge pocket SP-MR – Separation factor Ks!
c≠c2 ; c<c2

5. 2. Transition Side stream module and sludge hopper in BF reactor:
Sedimentation (sludge settling zone) is placed into biofilm reactor
Side stream module is operated as CM-MR with low recovery rate R (on membrane module)
Work to be done:
Defining sustainable flux for “optimum” ration between aeration rate and recycle flow rate in membrane reactor

6. sustainable flux=f (aeration rate, recycle flow rate)
2. Transition-
sustainable flux=f (aeration rate, recycle flow rate)
How to do it?
Suggestion:
Make a matrix
Stepping analysis for each combination
Apply e-g- Renka-Cline interpolation gridding method
Plot contour diagram Jc=f(Qa,Qr)
*Qa and Qr are independent
Aeration rates [L/min]
Qa1
Qa2 …
Qam
Recycle flow rate [L/min]
Qr1
Qr2 :
Qrn

7. 3.1. Nui’s system (HyVAB)– Sludge minimization Side stream
Integrating sludge stabilizer as a separate unit for better solid control and reducing production of excess biomass (lysis -cryptic growth, maintained metabolism and predation)
Actual loading rates on biofilm reactor should be recalculated (similar to OSA process!?! )
Biofilm reactor should be kept at low ORL (nitrification achieved)
Aeration/recirculation ratio in the membrane reactor should be adjusted – supplying higher DO in water from membrane reactor
Mathematical description of Anaerobic stabilizer (have to read more)
Experimental time min 3 months

8. Submerged configuration
3.2. Nui’s system (HyVAB)– Sludge minimization
Submerged configuration
No difference regarding role of anaerobic sludge stabilizer or biofilm reactor
Work to be done:
Comparison of energy savings submerged vs side stream
Evaluating ratios of sludge extraction biofilm reactor and membrane reactor
Comparing fouling mechanisms submerged/side-stream
Experimental time min 2 months

9. Submerged configuration
3.3. Nui’s system (HyVAB)– anaerobic/aerobic
Submerged configuration
The anaerobic sludge stabilizer here has role of anaerobic bioreactor for denitrification
Work to be done:
Recirculation rates biofilm reactor->anaerobic reactor (experience from ASIM) – denitrification
Membrane performance (compared with previous set up)
Finding suitable mathematical model for anaerobic bioreactor
Experimental time min 3 months

10. 3.5 Nui’s system (HyVAB)– original proposal
The best position of anaerobic sludge stabilizer regarding DO contamination
Sedimentation zone in biofilm reactor has role of mixing zone and should be analyzed separately. Mixing rations should be estimated based on mass balance of e.g. COD in several points in biofilm reactor.
Problem with ammonia in effluent from anaerobic sludge stabilizer->the same concentration will be measured in permeate
Higher FCOD (values mg/L) from anaerobic sludge stabilizer, giving potential higher membrane fouling

11. 4. Modeling (so far) – literature review
General process mass balance modeling approach – file no 1 – working on an excel sheet for solving mass balances equation with Runke Kutta
Application of current analytical model with (architecture of biofilm has to be taken in account) – available excel sheet – file no 2 / otherwise AquaSIM as an alternative
Modeling sludge stabilizer - !?! No ADM1 – rather Søtemann et al (everything expressed via COD) or simpler
Cost modeling - ? (nothing so far)
Cleaning – reading

12. 5. What next?
What is the priority for this pilot (is it some part of work for Eurombra; cleaning) - research plan – time line?
I am available to do full assistance on operating pilot regardless of upper discussion
I need more time regarding modeling:
Biofilm reactor
Membrane fouling
Anaerobic stabilizer