Document Permit issue and expiration date Document permit requirements If discharge to city, review Sewer Use Ordinance requirements
Review Discharge Monitoring Reports (DMR) requirements Review Signatory Authorization Form requirements Review control instrument calibration records requirements Spill/Slug Control Plan (up to date?) Sewer line drawings (up to date?)
Review certified operator requirements Review all applicable records (keep for 3 years) Operations Log Book – Record daily operational parameters at least 3 time per day. Include calibration records, maintenance performed, and any atypical operational issues and corrective action taken.
Cylindrical device to filter out large particles and proteins out of waste stream. Mesh Screen: Slot width typically 0.02” – 0.03” Back Doctor Blade: On back of screen - forms a seal that forces water through the screen. Front Doctor Blade: Must be tight against the screen to remove solids. Water Level Control: To rotate screen only when there are solids to be screened.
Flow: 2 gpm per square foot surface area. Hydraulic Retention Time (HRT) = 45 – 60 minutes, including recycle flow Solids Loading: 4 - 8 lbs TSS per hour per square foot surface area. Sludge generation: Volume dependent on influent loading and % solids. Recycle Water Flow Rate >= 0.5 x Influent Flow Rate (gpm )
Based on manufacturers specifications and flows and loadings versus design capacity; Without chemical treatment: approximately 50 - 60% O&G removal; With chemical treatment: approximately 70 – 80% O&G removal; Approximately 50% solids removal; Approximately 30% BOD removal (particulate BOD).
Whitewater system performance (pressure in air saturation tank and recycle water flow rate); Optimize skimmer speed to thicken sludge; Optimize water level on beach with weir adjustment to thicken sludge; Preventive maintenance per manufacturer specifications; Dewater and clean cell thoroughly to minimize the potential of septic sludge bottom layer.
Recycle water is drawn from the effluent of the float cell. Minimum recycle flow is half of the influent flow to the cell. Use a flow meter to monitor this flow Recycle pump wear can reduce flow.
Reduce discharge volume ◦ Reduces costs for purchasing and treating water ◦ City charges / surcharges ◦ Leaks / Single Pass Cooling / Cleaning methods ◦ Water reuse and recycling Reduce contaminants ◦ Dry clean up ◦ Use only the amount you need! (cleaners) ◦ Reuse / Extend the life of brines
Hint: YOURS! Keep current copies of all permits and plans (WebEMS – Permit and Controlled Document Sections) Summarize requirements (WebEMS – Monitoring Data Section) Use WebEMS Calendar and SAP for reminders Designate requirements to responsible team members Assure compliance (audit at least annually) Renew permits on time
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