Current through September 18, 2024
Authority: IC 13-13-5-1; IC 13-14-8-2; IC 13-14-8-7; IC
13-18-3-2
Affected: IC 13-12-3-1; IC 13-13-5-2; IC 13-14-9; IC
13-18-11
Sec. 6.
All subpart H systems that employ conventional filtration or
direct filtration treatment and recycle spent filter backwash water, thickener
supernatant, or liquids from dewatering processes shall meet the following
requirements:
(1) A system shall
notify the commissioner in writing by December 8, 2003, if the system recycles
spent filter backwash water, thickener supernatant, or liquids from dewatering
processes. This notification shall include, at a minimum, the following
information:
(A) A plant schematic showing
the following:
(i) The origin of all flows
that are recycled, including, but not limited to, spent filter backwash water,
thickener supernatant, and liquids from dewatering processes.
(ii) The hydraulic conveyance used to
transport all flows that are recycled, including spent filter backwash water,
thickener supernatant, and liquids from dewatering processes.
(iii) The location where all flows that are
recycled, including spent filter backwash water, thickener supernatant, and
liquids from dewatering processes, are reintroduced back into the treatment
plant.
(B) Typical
recycle flow in gallons per minute.
(C) The highest observed plant flow
experienced in the previous year in gallons per minute.
(D) Design flow for the treatment plant in
gallons per minute.
(E)
Commissioner-approved operating capacity for the plant where the commissioner
has made such determinations.
(2) Any system that recycles spent filter
backwash water, thickener supernatant, or liquids from dewatering processes
shall return these flows:
(A) through the
processes of a system's existing conventional or direct filtration system as
defined in
327 IAC 8-2-1(14)
and
327 IAC
8-2-1(18); or
(B) at an alternate location approved by the
commissioner by June 8, 2004.
If capital improvements are required to modify the recycle
location to meet the requirement in this subdivision, all capital improvements
shall be completed no later than June 8, 2006.
(3) Subpart H systems shall collect and
retain on file the following recycle flow information on forms provided by the
department for review and evaluation by the commissioner beginning June 8,
2004:
(A) A copy of the recycle notification
and information submitted to the commissioner under subdivision (1)(B) through
(1)(E).
(B) A list of all recycle
flows and the frequency with which they are returned.
(C) The average and maximum:
(i) backwash flow rate through the filters;
and
(ii) duration of the filter
backwash process in minutes.
(D) The typical filter run length and a
written summary of how the filter run length is determined.
(E) The type of treatment provided for the
recycle flow.
(F) Data on the
following:
(i) The physical dimensions of the
equalization and treatment units.
(ii) The typical and maximum hydraulic
loading rates.
(iii) The type of
treatment chemicals used and average dose and frequency of use.
(iv) The frequency at which solids are
removed, if applicable.
