Current through Register Vol. 30, No. 38, September 20, 2024
A. A 4.16
General Permit allows for the construction and use of a nitrate-reactive media
filter receiving pretreated wastewater.
1.
Definition. "Nitrate-reactive media filter" means a treatment technology
characterized by:
a. The application of
pretreated, nitrified wastewater to a packed bed filter in a containment
structure. A packed bed filter consists of nitrate-reactive media that receives
pretreated wastewater under appropriate design and operational conditions, and
b. The ability of the
nitrate-reactive filter to further treat the nitrified wastewater by removing
total nitrogen by chemical and physical processes.
2. An applicant shall use a nitrate-reactive
media filter with a treatment or disposal works to pretreat and dispose of the
wastewater.
3. An applicant may use
a nitrate-reactive media filter if nitrogen reduction is required under this
Article.
B. Restrictions.
The applicant shall not use any product to supply pretreated wastewater to the
nitrate-reactive media filter unless:
1. The
product meets the pretreatment requirements for the filter based on product
performance information in the product listing, and
2. The product is listed by the Department as
a reviewed product under
R18-9-A309(E).
C. Performance. An applicant shall ensure
that a nitrate-reactive media filter is designed so that it produces treated
wastewater that does not exceed the following criteria:
1. TSS of 30 milligrams per liter, 30-day
arithmetic mean;
2.
BOD5 of 30 milligrams per liter, 30-day arithmetic
mean;
3. Total nitrogen (as
nitrogen) of 10 milligrams per liter, five-month arithmetic mean; and
4. Total coliform level of 1,000,000
(Log10 6) colony forming units per 100 milliliters, 95th
percentile.
D. Notice of
Intent to Discharge. In addition to the Notice of Intent to Discharge
requirements specified in
R18-9-A301(B)
and
R18-9-A309(B),
an applicant shall submit:
1. The name and
address of the filter manufacturer;
2. The filter model number;
3. The manufacturer's requirements for
pretreated wastewater supplied to the nitrate-reactive media filter;
4. The manufacturer's specifications for
design, installation, and operation for the nitrate-reactive media filter
system and appurtenances;
5. The
manufacturer's warranty for the nitrate-reactive media filter system and
appurtenances;
6. The
manufacturer's operation and maintenance recommendations to achieve a 20-year
operational life for the nitrate-reactive media filter system and
appurtenances; and
7. The
manufacturer name and model number for all appurtenances that significantly
contribute to achieving the performance required in subsection
(C).
E. Design
requirements. In addition to the applicable design requirements specified in
R18-9-A312,
an applicant shall ensure that:
1. The
nitrate-reactive media filter and appurtenances conform with manufacturer's
specifications,
2. The loading rate
of pretreated wastewater to the nitrate-reactive media inlet surface meets the
manufacturer's specification and does not exceed 5.00 gallons per day per
square foot of media inlet surface area, and
3. The bed packed with nitrate reactive media
is at least 24 inches thick.
F. Installation requirements. In addition to
the applicable requirements in
R18-9-A313(A),
an applicant shall ensure that:
1. The
nitrate-reactive media filter and appurtenances are installed according to
manufacturer's specifications to achieve proper wastewater treatment, hydraulic
performance, and operational life; and
2. Anti-buoyancy devices are installed when
high water table or extreme soil saturation conditions are likely during
operational life of the facility.
G. Operation and maintenance requirements. In
addition to the applicable requirements in
R18-9-A313(B)
and the manufacturer's specifications for the nitrite-reactive media filter,
the permittee shall not dispose of corrosives or other materials that are known
to damage the nitrate-reactive media filter system into the on-site wastewater
treatment facility.
