| (a) For a wastewater treatment facility designed to
provide advanced nutrient removal, the engineering report must specify
the process units needed to achieve the effluent limits established
in the wastewater treatment facility's wastewater permit.
(b) Biological nutrient removal using an activated
sludge process, membrane filtration, sand filtration, or a combination
of these processes may be used for advanced nutrient removal without
applying for the executive director's approval under the innovative
or non-conforming technology criteria in §217.7(b)(2) of this
title (relating to Types of Plans and Specifications Approvals). A
biological nutrient removal process that involves fixed-film treatment
is subject to the executive director's determination under §217.7(b)(2)
of this title.
(c) If a biological nutrient removal unit is proposed,
the engineering report must include the:
(1) anticipated food to microorganism ratio in both
the anoxic and anaerobic zones;
(2) volatile fatty acid recycle ratio; and
(3) design of a foaming control system.
(d) If a chemical addition unit is proposed, it must
comply with the chemical containment requirements in Subchapter K
of this chapter (relating to Chemical Disinfection). Chemical addition
may only be used if approved in writing by the executive director.
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