Activated Sludge Processes for Wastewater Treatment

Nomenclature and Abbreviations

LQ

Linear quadratic

AS

Activated sludge

MLSS

Mixed liquor suspended solid

ASM1

IAWQ Activated Sludge Model No.1

NOx

Oxides of oxygen

ASM2

IAWQ Activated Sludge Model No.2

ODE

Ordinary differential equation

ASM3

IAWQ Activated Sludge Model No.3

OUR

Oxygen utilization rate

BNR

Biological nutrient removal

P

Proportional

BOD

Biochemical oxygen demand (mgr1)

PAO

Phosphorous accumulation organisms

BOD5

Five day BOD (mgr1)

PDE

Partial differential equation

BSE

Bovine Spongiform Encephalopathy (mad

PHA

Poly-hydroxyl-alkanoates

cow disease)

PI

Proportional-integral

COD

Chemical oxygen demand (mgr1)

PID

Proportional-integral-derivative

DAE

Differential algebraic equation

PP

Poly-phosphate

DMC

Dynamic matrix control

PSE

Process systems engineering

DO

Dissolved oxygen

RAS

Return activated sludge

DPS

Distributed parameter system

SBR

Sequential batch reactor

DSVI

Dilute sludge volume index

SDI

Sludge density index

fsd

Fractional sludge depth

SISO

Single input single output

GDPMC

Generic distributed parameter model

SRT

Sludge retention time

control

SSVI

Stirred specific volume index

GMC

Generic model control

STO

Stored

HRT

Hydraulic retention time

SVI

Sludge volume index

IAWQ

International Association on Water Quality

S

Concentration of soluble materials (mg l_1)

IWA

International Water Association

Sa

Concentration of volatile fatty acid (mg l_1)

LCA

Life cycle assessment

Sf

Concentration of fermentable substrate

LPM

Lumped parameter model

(mgr1)

Si

Concentration of inert soluble organic

Concentration of autotrophic nitrifying

matter (mg r1)

biomass (mg l_1)

Snd

Concentration of soluble organic nitrogen

Xb

Concentration of biomass (mg T1)

(mg r1)

Xh

Concentration of heterotrophic biomass

snh

Concentration of 'ammonia' in biodegrad

(mgr1)

able nitrogen matter (mg r1)

Xi

Concentration of inert suspended organic

sno

Concentration of nitrate nitrogen (mgr1)

matter (mg l_1)

So

Concentration of dissolved oxgyen (mg r1)

xnd

Concentration of particulate organic

spo4

Concentration of phosphate (mg r1)

nitrogen (mg r1)

Ss

Concentration of soluble substrate (mg r1)

Xp

Concentration of particulate product

VFA

Volatile fatty acid

(mgr1)

WAS

Waste activated sludge

Xs

Concentration of particulate substrate

X

Concentration of particulate materials

(mgr1)

(mgr1)

xsto

Concentration of organics stored by

xaut

heterotrophic biomass (mg l_1)

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