https://gaftp.epa.gov/ap42/ch02/s02/reference/ref_02c02s02.pdf
Sludge is not rendered totally inert by composting. The composting process is
considered complete when the product can be stored without giving
rise to nuisances such as odors, and when pathogenic organisms
have been reduced to a level such that the material can be
handled with minimum risk.
The aerobic reaction
provides heat for warming the windrows. This causes the air
to rise, producing a natural chimney effect. The rate of air
exchange can be regulated by controlling the porosity and
size of the windrow (2). The turning of the windrow also
introduces oxygen to the microorganisms.
Total Biosolids Facilities: There are approximately 280 biosolids composting facilities operating nationwide. [1, 2]Backhus Presence in the U.S.: Eggersmann, the parent company of Backhus, recently celebrated the delivery of its 200th windrow turner to the U.S. market. These machines are deployed across both biosolids and general commercial composting sites BACKHUS self-propelled windrow turners are widely utilized in large-scale biosolids and sewage sludge composting. Florida biosolids composting in windrows
Each
windrow must be turned two or three times a day for the first
five days to mix the material completely, minimize odors, and
ens ure suf f ic ient oxygen trans fer. The sl udge is then turned
once a day for abou t 30 days, depending on weather condi tions.
Figure 12-5 shows a windrow being turned at Los Angeles
The forced air method provides for more flexible operation and
more precise control of oxygen and temperature conditions in
the pile than would be obtained with a windrow system. Since
composting times tend to be slightly shorter and anaerobic
condi tions can be more readily prevented, the risk of odors is
reduced.
Two distinct aerated static pile methods have been developed,
the individual aerated pile and the extended aerated pile.
The composting and
all other outdoor operations will take place on a concrete pad
which is easier to clean than a gravel base, prevents rocks from
mixing with the compost, and is a better year-round working
surface. The pad is sloped to allow runoff collection from the
compost piles. The runoff is recycled to the treatment plant to
provide protection for the surrounding land and streams.
The construction of composting plants has almost ceased in
European countries other than Sweden. Apparently most
operating plants have difficulties in marketing the compost
at a satisfactory price.
https://cwmi.css.cornell.edu/chapter2.pdf
https://www.biocompost.se/en/solutions/
“Hauling dewatered biosolids three times a day more than 80 miles was
not financially viable, so we explored the possibility of in-vessel
composting. Utilizing MSW to supply the carbon side of the composting
equation is what led us to start our original plant.” An article in the
August 2004 issue of BioCycle (“Expanding The Potential of In-Vessel
Composting”) documents the evolution of the Pinetop-Lakeside plant,
which started out with a used Eweson digester
https://www.biocycle.net/mixed-msw-composting-facilities-in-the-u-s/
canadian biosolids composting
frozen solid biosolids composting vid
https://compostsystems.com/new-commercial-compost-facility-ecs-and-pdswm-develop-aerated-composting-system-in-minnesota/
https://popedouglasrecycle.com/glacial-ridge-compost-facility/
As a result, the addition of a biolayer cover was written into the EPA
regulations governing the static composting of biosolids, and
subsequently adopted into many state composting regulations concerning
pathogen control. As biolayer covers became widespread, air quality
regulators began to characterize them as pollution control devices; they
appear in many air quality permits. During this evolution, equipment
manufacturers such as ECS introduced a series of fabric covers to the
market with claims of improving both the composting process and thermal
and environmental control (especially control of odor and VOC’s).
https://compostsystems.com/compost-covers/
This acts as an insulation layer for pathogen destruction as well as a
modest surface biofilter. Biolayer covers need to be at least 6 inches
deep to function but are often required to be 12 inches in very cold
climates and by some regulators.
Rynk, Robert et. al. The Composting Handbook: A how-to and why manual for farm, municipal, institutional, and commercial composters. 2022. Compost Research & Education Foundation.
composting biosolids um which was developed by the USDA at the Belville research station
sometimes it's called the Bel aat static pile method typically recommended composting
https://www.youtube.com/watch?v=HZIsnzBnTKQ
https://www.biocompost.se/en/sustainability/
Can this be applied to rusty surfaces?