Three
causes of septic system soil failure
Septic
system soil failure may be physical, biological or chemical.
These three conditions often occur in sequence. For
instance, when chemical (cationic) exchanges occur from
sodium, fines or clay particles may
bond into a waterproof barrier, which in turn causes
the physical flooding, blockage of soil passages and
biological death of air-dependent cleaning organisms
in the soil.
Agricultural
soil and wastewater scientists have long recognized
that in time, sodium in irrigation waters will cause
finer soil particles to bond together into impermeable
layers. In agriculture, this chemical change causes
physical or structural changes in the soil which ultimately
leads to loss of biological uptake of plant nutrients.
In
the septic system drainfield, problems begin when a
thin impermeable layer of bonded fines develops directly
under the leachlines or on the trench floor or walls.
This
layer grows in density over time and soon a "waterproof"
barrier prevents access to the absorptive active soil
surfaces needed for maximum organism contact and cleanup
of wastes.
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