Wastewater Treatment Plant Improvements
Thonhoff Consulting Engineers prepared a Preliminary Engineering Report (Facility Plan) and Environmental Report in compliance with Texas Water Development Board funding guidelines which recommended wastewater treatment and collection improvements for the City of Burnet over a 20-year design period. The project encompassed the construction of a 1.7 MGD BNR WWTP to meet effluent criterion of 5 mg/l CBOD5, 5 mg/l TSS, 2 mg/l NH3-N, 6 mg/l TN, 0.5 mg/l P, 5.0 mg/l O2 and E. coli 126/100 ml. As a result of settlement agreements with the City of Austin and LCRA, Burnet agreed to a 0.15 mg/l P limitation. This effluent criterion is considered the most stringent discharge limitation in Texas.
Unit processes included mechanical screening (0.25”), biological nutrient removal (N and P), activated sludge, final clarification, chemical phosphorus removal, tertiary filtration, ultraviolet disinfection, cascade aeration, aerobic digestion, sludge thickening, belt filter press sludge dewatering, beneficial reuse of sludge, effluent discharge and effluent irrigation.
Wastewater collection system improvements were constructed to mitigate infiltration/inflow and provide sewer capacity for the design life of the facility. Sewer improvements included approximately 2.4 miles of 15-24 sewer interceptor line and 2.1 miles of 8-inch effluent reuse line.
Services Provided: All Basic and Additional Engineering Services: Preliminary Engineering & Environmental Report, Final Design Phase, Bid Phase, Construction Phase Services, and Post-Construction Services. TCE procured construction permitting from LCRA, TxDOT, USACE, and TCEQ.