Ariz. Admin. Code § R18-11-303 - Class A+ Reclaimed Water
A.
Class A+ reclaimed water is wastewater that has undergone secondary treatment,
filtration, nitrogen removal treatment, and disinfection. Chemical feed
facilities to add coagulants or polymers are required to ensure that filtered
effluent before disinfection complies with the 24-hour average turbidity
criterion prescribed in subsection (B)(1). Chemical feed facilities may remain
idle if the 24-hour average turbidity criterion in (B)(1) is achieved without
chemical addition.
B. An owner of a
facility shall ensure that:
1. The turbidity
of Class A+ reclaimed water at a point in the wastewater treatment process
after filtration and immediately before disinfection complies with the
following:
a. The 24-hour average turbidity
of filtered effluent is two NTUs or less, and
b. The turbidity of filtered effluent does
not exceed five NTUs at any time.
2. Class A+ reclaimed water meets the
following criteria after disinfection treatment and before discharge to a
reclaimed water distribution system:
a. There
are no detectable fecal coliform organisms in four of the last seven daily
reclaimed water samples taken, and
b. The single sample maximum concentration of
fecal coliform organisms in a reclaimed water sample is less than 23 / 100
ml.
c. If alternative treatment
processes or alternative turbidity criteria are used, or reclaimed water is
blended with other water to produce Class A+ reclaimed water under subsection
(C), there are no detectable enteric virus in four of the last seven monthly
reclaimed water samples taken.
3. The 5-sample geometric mean concentration
of total nitrogen in a reclaimed water sample is less than 10 mg / L.
C. An owner of a facility may use
alternative treatment methods other than those required by subsection (A), or
comply with alternative turbidity criteria other than those required by
subsection (B)(1), or blend reclaimed water with other water to produce Class
A+ reclaimed water provided the owner demonstrates through pilot plant testing,
existing water quality data, or other means that the alternative treatment
methods, alternative turbidity criteria, or blending reliably produces a
reclaimed water that meets the disinfection criteria in subsection (B)(2) and
the total nitrogen criteria in subsection (B)(3) before discharge to a
reclaimed water distribution system.
D. Class A+ reclaimed water is not required
for any type of direct reuse. A person may use Class A+ reclaimed water for any
type of direct reuse listed in Table A.
Notes
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