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Residuals Management Section
SLUDGE MANAGEMENT
The term “sludge” is used to describe the solid, semisolid and
liquid material produced by water and wastewater treatment processes. It
includes industrial sludge and sludge mixtures, but does not include domestic
septage or sludge disposed at solid waste facilities. The term “biosolids”
means any sludge derived from a municipal wastewater treatment facility
that meets Department standards for beneficial reuse. DES regulates the
processing, transportation, and disposal/reuse of sludge and biosolids
to ensure this material is utilized or disposed in an environmentally sound
manner.
Whenever possible, recycling through the regulated beneficial use of
biosolids for land application or composting for nutrient value and soil
conditioning, is promoted by DES. These activities utilize a valuable resource
that may otherwise be disposed in a solid waste landfill, thereby preserving
valuable landfill capacity.
There are four different types of permits or certifications required
for the proper management of sludge or biosolids: Sludge Quality Certification,
Sludge Hauler Permit, Sludge Facility Permit, and Biosolids Site Permit.
SEPTAGE MANAGEMENT
The term “septage” is generally used to describe the liquids and solids
that are pumped from a septic tank or cesspool. The term also applies to
the waste pumped out of holding tanks and from boat toilets and porta-potties.
The Department regulates the removal, transportation, and disposal of septage
to ensure this material is utilized or disposed in an environmentally sound
manner. Whenever possible, recycling through the beneficial use of
septage land application is promoted by DES. Disposal of septage
at a POTW adds significantly to the generation of sludge, a residual that
must also be land applied or disposed. A lagoon is only a temporary
holding facility: eventually the accumulated solids must be excavated and
properly utilized/disposed. Land application practices utilize nutrients
that may otherwise be disposed in a publicly owned wastewater treatment
facility (POTW) or lagoon.
There are four different types of permits or registrations required
for the proper management of septage: Septage Hauler Permit,Septage Holding Tank Registration,
Septage Facility Permit, and Septage Site Permit.
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