Current through Register Vol. 48, No. 39, March 25, 2024
Subpart 1.
General.
An owner composting only manure at a manure compost site
shall comply with subparts
2 and
3. An owner composting manure
and solid wastes shall comply with part
7035.2836, subparts 4 to 7. An
owner composting dead animals shall comply with part
1721.0740.
Subp. 2.
Operational
requirements.
An owner of a manure compost site meeting the requirements of
subpart
1 shall comply with items A
to C.
A. The owner shall comply with
part
7020.2125.
B. If operating a compost site under part
7020.2125, subparts
1 to
3, the owner shall comply
with part
7020.2125, subpart 4, item
C.
C. The owner shall produce
finished compost by a process to further reduce pathogens (PFRP). The
temperature and retention time for the material being composted must be
monitored and recorded each day. The owner shall comply with one of the PFRP
methods in subitems (1) to (3).
(1) The
windrow method for reducing pathogens consists of an unconfined composting
process involving periodic aeration and mixing. Aerobic conditions must be
maintained during the compost process. A temperature of 55 degrees Celsius must
be maintained in the windrow for at least three weeks. The windrow must be
turned at least once every three to five days.
(2) The static aerated pile method for
reducing pathogens consists of an unconfined composting process involving
mechanical aeration of insulated compost piles. Aerobic conditions must be
maintained during the compost process. The temperature of the compost pile must
be maintained at 55 degrees Celsius for at least seven days.
(3) The enclosed vessel method for reducing
pathogens consists of a confined compost process involving mechanical mixing of
compost under controlled environmental conditions. The retention time in the
vessel must be at least 24 hours with the temperature maintained at 55 degrees
Celsius. A stabilization period of at least seven days must follow the enclosed
vessel retention period. Temperature in the compost pile must be maintained at
least at 55 degrees Celsius for three days during the stabilization
period.
Subp.
3.
Record keeping and reporting requirements.
An owner of a manure compost site that is required to apply
for and obtain a permit under part
7020.0405, subpart
1, item A or B, must:
A. analyze mature manure compost and maintain
records of the results for:
(1) pH;
(2) moisture content;
(3) particle size;
(4) NPK ratio; and
(5) soluble salt content; and
B. if the owner's NPDES or SDS
permit requires submittal of an annual report, include the following
information in the annual report:
(1) the
quantities and sources of manure and bulking agents delivered to the
facility;
(2) temperature and
retention time data for all compost produced; and
(3) the information recorded under item
A.