Dictionary of Water and Waste Management, Second Edition

E: EA Extraction Procedure (EP) Toxicity Test

EA egg shaped sewer

EA

Environment Agency.

earth piercing

Impact moling.

earth pressure balance (EPB) machine

A microtunnelling machine in which mechanical pressure is used to balance pressures in the surrounding soil during the tunnelling operation and so prevent heave or subsidence.

Earth Summit at Rio

Rio Earth Summit.

easement

A legal right to move past or over land e.g. the riparian right of an upstream landowner to discharge water downstream where neither bank of the watercourse belongs to him.

EBBR

Expanded bed biofilm reactor.

EBCT

Empty bed contact time.

E beam disinfection

The use of a stream of high energy electrons for disinfection.

EBPR

Enhanced biological phosphorus removal. See biological phosphorus removal.

EC

Electrical conductivity.

EC

(1) The European Commission (2) The European Community, now replaced by the European Union (EU).

EC Directive

See European Union Directive.

ECJ

European Court of Justice.

Echo virus

Many types of Enteric Cytopathogenic Human Orphan virus can cause gastroenteritis. Some may be waterborne.

E. coli, Escherichia coli

A bacterium of faecal origin which forms 90% of the coliform group in the human intestine. It is normally distinguishable from other coliforms by its ability to grow at 44 C in MacConkey s broth. A few strains are pathogenic ( see below). For drinking water, no sample should contain any E. coli.

E. coli 0157

A serotype of E. coli that is a dangerous pathogen causing serious diseases including liver...

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