Issue: A lakeside bar and grill is served by an onsite sewage treatment system. The drain field mound is ponded and will soon create a surface discharge if not repaired. Space is restricted and the owner wants to avoid a replacement drain field mound. Design flow is 1,177 GPD, tanks include three 1,500-gallon septic tanks. Measured average influent: 450 GPD, CBOD 956 mg/L, TSS 132 mg/L, FOG 84 mg/L.
Action: Install an MBD-8 aerator and effluent screen in the second septic tank; install an effluent screen in the third septic tank; and update risers on all three septic tanks.
- Effluent CBOD: 92.0 mg/L
- Effluent TSS: 47.9 mg/L
- Effluent FOG: 2.5 mg/L