Attachment 6A – Wastewater Treatment Plant ‐ Emissions and Discharges
The design of the WWTP and landfill has considered local topography, the locations of drainage lines, flood levels and avoided creeks and areas with the potential for flooding. In addition, the following management measures will be implemented.
WWTP:
The proposed WWTP is located outside the flood risk areas.
The WWTP will have contingency storage capacity for up to two days of normal flow if discharge is suspended while any problems are fixed.
Effluent discharge from the WWTP will be via sprinklers to maximise evaporation.
Discharge will be managed to allow irrigated treated water to infiltrate or evaporate and prevent surface ponding or runoff from the irrigation area.
Pipelines will be located within bunds to ensure all that in the event of a spill or leak, effluent is captured and not released to the environment.
Pipelines will be inspected daily to identify leaks, spills or failures.
Daily inspections of the irrigation area will be carried out to ensure system is functioning correctly and no ponding is present.
Quarterly monitoring will be carried out for the irrigation area.
Table 1 presents the effluent quality that can be expected from the Sewage Treatment Plant if the influent loadings are not exceeded. The treatment plant is designed for specific influent concentrations. The influent concentrations relative to the hydraulic load for design are proportional, meaning the influent concentrations can be higher, if the hydraulic load is lower. The system will need to be tuned to the site concentrations experienced.
These influent characteristics are detailed in Table 1.
Table 1: WWTP Discharge Characteristics
CHARACTERISTIC INFLUENT EFFLUENT QUALITY
Monitoring Frequency
Maximum flow (m3/day) 50 Daily (volume treated)
BOD (mg/L) 300 <20
Within 7 days of commencement of
discharge
SS (mg/L) 300 <30
Total N (mg/L) 80 <2030
NH3 – N (mg/L) 60 <1
Total P (mg/L) 20 <5
15 Faecal Coliforms (units/100
mL)
‐ <100
Dissolved Oxygen (mg/L) ‐ >2
Commented [JH1]: Note to assessor. Performance tables updated to reflect performance data from in‐situ testing.
Design Certification update provided in Attachment.
"V2 Potash Ecofarmer 250 Design Certification .pdf"
