03 gmp-tg history

8/13/2019 03 GMP-TG History

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GMP and BSM TGs | activated sludge modelling from past to future I imre takcs13.09.2006

activated sludgeactivated sludge modellingmodellingfrom past to futurefrom past to future

imreimre taktak cscsTG GoodTG GoodModellingModelling PracticePractice


whatwhat happenedhappened in 25in 25 years years ??


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line ofline of thoughtthought

disclaimerbrief recap of last 20 yearswhats happening now?discussion starters


short historyshort history

summer of 1858: Great Stink in Londonactivated sludge process from early 1900sempirical designearly models based on BOD, MLSSexperiments at UCT from 60sfirst structured (detailed, mechanistic)

dynamic model ASM1 1986 from IWA TGgave a framework to research


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models and themodels and the GujerGujer matrixmatrix


available modelsavailable models

ASM1, ASM2, ASM2d, ASM3, ASM3C,Eawag bio-P, TUDM, Mantis, General,ASDM, Wentzel, Comeau, Mino, Barker-Dold, many others

many modifications, additionstreasure trove of information or a mess?trend towards whole plant modelling

whole plant models interfaced process models


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the plant andthe plant and ASMsASMs


0

10

20

30

40

50

60

70

80

90

100

1971 1976 1981 1986 1991 1996 2001 20060

1

2

3

4

5

6

# of Variables

CPU (GHz)

modelsmodels and computerand computer capacitycapacity


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use in practiceuse in practice

late 80s: started (slowly)

90s: sudden bursts and gradually increased usetoday: used on almost every plant in the US,Australia, and many countries in Europe

what do you believe more? model or data?


available softwareavailable software

commercial GPS-X, SIMBA, STOAT, WEST, BioWin,

research/training SSSP, ASIM, AQUASIM,

other (specialized, steady-state, extinct, etc.) CapDet, DSP, Plan-It Stoat, Pro-2D, SassPro,

ToxChem, EFOR, VIB, VNP, UCTASP,spreadsheet implementations,


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a real GMPa real GMP ggoodood mmodellerodeller inin ppracticeractice

first a process engineerfamiliar with the plant modelleddoes not believe the data without checking

and by the wayunderstands the model


processesprocesses modelledmodelled

BOD and COD (organic material) removal Oxygen demand, sludge production

nitrification, denitrification Oxygen demand, aerobic anoxic tank volumes, NH

3and NO

3

-

biological phosphorus removal PO4-, acetate requirement

alkalinity

based on: substrate transformations,

growth and decay of various biomasses


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processesprocesses modelledmodelled (beyond standard ASM level)(beyond standard ASM level)

oxygen transferpH and alkalinityanaerobic digestionchemical reactions

chemical P removal precipitation (phosphates, carbonates, struvite)

additional units

side stream processesgas phase composition true O2 saturation, CO 2, NH3 stripping

y = 0.0034x + 6.487R 2 = 0.1373

6.2

6.4

6.6

6.8

7

7.2

7.4

50 70 90 110 130 150

Alk alinity [mgCaCO3/L]

pH


new buzzwordsnew buzzwords

elemental balancingmetabolic modelssupermodels and interfaces


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discussion startersdiscussion starters

1) are we using these models to their fullpotential?

we still make it too complicated!is there a difference between usage in

North America and Europe?must solve practical problems, easily



2) whats wrong with the AS models?

TSS prediction - colloidsdenitrification - yieldsdifferent carbon sourcesN, P fractionsinorganic suspended solids

new knowledge must be incorporated andmade easily available for the users


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3) are there too many parameters in ourmodels?

k

k



3) are there too many parameters in ourmodels?

k 1, k 2


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4) is there any need for further modelling researchand development?

many real engineering situations are still not handled(well) whole plant low nutrient limits multiple substrates specialist biomass (industry) adaptation, acclimation sidestream, Anammox GAOs, G-bacteria effect of diffusion on K S etc., etc


discussion starter conclusiondiscussion starter conclusion

no synthesisno independent trainingwe need better models and better user

manuals

we are missing Kollekolle!


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discussion starter conclusiondiscussion starter conclusion

there are guidelines out there

WERF influent fractionation onlyHSG outline onlySTOWA now this is a good simple oneBioMath just perfect but who has the time?Japanese Sewage Works in Japanese

here comes the GMP TG


so do we think now that:so do we think now that:

modelling: tools are available is used widely in parts of the world needs specialized knowledge lots of questions remain open is fun!


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this is methis is me

imre takcs

CANADA

[email protected]

E n v i r o S i m A S S O C I A T E S L T D.

03 gmp-tg history

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