PAC
Packing column (O₃ dissolution)
PAH
Paint booths
Paper and card
Paper for plain paper copiers
Paper pulp
Paracetic acid
Particle size (analysis)
Particles (dimensions of)
Passivation (corrosion)
Pathogenic micro-organisms
Pathogens
PCB
PCBA
Pelletisation
Periphyton
Permeation (gaseous)
Permeation - permeability
Pesticides
Pesticide removal unit
Petrochemicals
Petroleum oil industry

• deballasting
• injection water production for assisted oil recovery
• IWW treatments (three typical examples)
• oilfield water
• petrochemicals
• refineries
• refineries and petrochemicals
• refining (IWW)

pH
Pharmaceutical industry

• effluent treatment (example)
• separation using ion exchangers
• UPW for the pharmaceutical industry

Pharmaceuticals
Phenols (in DW)
Phosphates

• eutrophization agents
• phosphorous cycle
• phosphorus removal

Phosphorous cycle
Phosphorus
Photosynthesis
Physico-chemical (treatment)

• of anions
• of H₂S
• of hardness
• of iron
• of manganese
• of metals
• of NH₄
• of nitrates
• of silica
• of urban effluent

Physical-chemical phosphate removal
Phytoplankton
Pickling (steel mills)
pK
pKS
Plankton - phytoplankton
Plant kingdom
Plug-flow
Polarography
Polishing drinking water

• algae metabolites
• bactericidal effect and remanent effect
• biological activity
• CRISTAL and extended cristal
• drinking water disinfection
• micro-pollutant adsorption
• nanofiltration
• oxidising micro pollutants
• problems associated with algae and zooplankton
• removing micro-algae
• removing micro-organisms (cysts and micro-invertebrates)
• use of membranes in drinking water treatment