Project
Description: H&A
provided conceptual design, final design, construction oversight,
and monitoring and reporting for the successful pilot scale
Supernatant Overland Flow Treatment System (SOFTS). The pilot
scale SOFTS was designed to apply supernatant over four test
plots and dispose of septage-pond supernatant via absorption
and evapotranspiration.
Pre-design activities included a 5-day biochemical oxygen demand
(BOD5) removal efficiency analysis. The principal overland-flow
design parameters included slope length, slope grade, application
rate and operating cycle. These parameters in addition to local
climate and geology helped in determining the design of the
system. Efficiency was measured by the quantity of supernatant
applied and the amount of BOD5 content removed from the supernatant.
Several monitoring and sample collection methods were employed
including gypsum blocks, shallow lysimeters, and french drains.
Over the course of approximately five months, 260,500 gallons
were disposed of over the one-acre test plot area
This saved Butte County considerable costs for pumping and hauling the supernatant to offsite disposal facilities, while complying with regulatory requirements.
H&A
provided conceptual design, final design, construction oversight,
and monitoring and reporting for the successful pilot scale
Supernatant Overland Flow Treatment System (SOFTS). The pilot
scale SOFTS was designed to apply supernatant over four test
plots and dispose of septage-pond supernatant via absorption
and evapotranspiration.