MBR and Sludge glossary (P)

P removal
Phosphorus removal

p.e.
Population equivalent

P&F
Plate and frame

P&ID
Piping and instrumentation diagram

PAC
Powdered activated carbon

Paddle dryer
Conductive dryer based on heated horizontal paddles rotating in the sludge solids

PAN
Polyacrylonitrile

Pathogenic
Disease-causing

PBR
Photobioreactor

pCOD
Total particulate COD

PDF
Peak daily flow

PDMS
Poly-dimethyl siloxane

PDT
Pressure decay testing

PE
Polyethylene

Perforated screen
Type of screen formed from sheet metal with punched holes

PES
Polyethylsulphone

PFI
Private finance initiative

PFR
Plug flow reactor

Picket fence thickener
Type of gravity thickener employing a stirrer comprising a series of relatively closely-spaced vertical arms

Plate press dryer
Conductive dryer based on a filter press

POEM
Poly(oxyethylene methacrylate)

Polyelectrolyte
Polymeric material containing ionic components

Polymer
Alternative term for organic polyelectrolyte

PP
Polypropylene

PPCPs
Pharmaceuticals and personal care products

Primary sludge
Sludge produced from the initial sedimentation step of conventional municipal wastewater treatment

PS
Polysulphone

Psychrophilic
Bacteria or processes favouring temperatures below ~20 °C

PTFE
Polytetrafluoroethylene

Putrescence
Decay or rotting

PV
Pervaporation

PVDF
Polyvinylidene difluoride

Pyrolysis
Thermochemical treatment in the absence of water and air