| (a) Supernatant, filtrate, or centrate resulting from
sludge processing must be returned to the headworks of the wastewater
treatment facility, the influent lift station, or to a point preceding
an aeration system or secondary treatment unit.
(b) A sludge processing unit must limit digester supernatant
liquor volume to the greatest extent practicable.
(c) Returned supernatant, filtrate, or centrate from
a sludge processing unit must not interfere with wastewater treatment
processes in another treatment unit.
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