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Keywords:
AERATION,
BIOLOGICAL,
SEWAGE,
ACTIVATED,
SLUDGE,
AIR,
MECHANICAL,
AGITATION,
DISPOSAL,
PURIFICATION,
SEDIMENTATION,
BACTERIA,
BEDS,
OXYGEN,
TEMPERATURE,
PRESSURE,
TANKS,
SURFACE,
ELECTRICAL,
TENSION,
FILTERS,
BACTERIAL,
TREATMENT,
DIFFUSERS,
COSTS,
POLLUTION,
BIRMINGHAM,
UK
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© Thomas Telford and ICE
1924
