Aquest UV Tech was approached by a contractor to supply a UV/AOP solution to treat municipal wastewater to potable reuse standards. The project involves a complex treatment train ending in UV combined with advanced oxidation step which achieves an overall 6 Log reduction in viruses and destruction of organics, recalcitrant chemicals, disinfection byproducts and other micropollutants. The UV equipment supplied was required to meet current flow rates and expanded flow/performance criteria for future flow increases within a limited footprint. The oxidant used in the UV/AOP reaction for CEC removal was hydrogen peroxide. UV/AOP is the most critical step in the project to meet the end water quality requirement specified by the consulting engineers in the project specifications and performance testing requirements.
| Design Criteria | |
|---|---|
| UV Reactor | Trojan UV FLEX AOP |
| Application | Waste water disinfection |
| Current Design Flowrate | 2042 m³/hr |
| Expanded Future Flowrate | 4000 m³/hr |
| UV Transmission | 70 % |
| Minimum UV Dose | 285 mJ/cm² |
| Disinfection Target | 6 Log reduction Viruses/0.3 Log NDMA (nitrosodimethylamine) |
| Expanded target | 0.5 log NDMA |
| Validation | Bioassy Validated, Full Compliance with USEPA and UVDGM for high level applications |
| System Overview | |
| Trojan UVFlex | Close Vessel UV Reactor, fully automated, compact and modular with low lamp count and high electrical efficiency. |
| Current Configuration | 2 x duty +1 standby reactor (3 reactors ) |
| Future Configuration | 3 x duty +1 standby reactor (4 reactors) |
| Lamp | 1000W, LPHO Amalgam, Trojan UV Solo Lamp 15 000 hours |
| UV/AOP Dose control | PLC based controller, uses deterministic equation based methodology to calculate UV energy required achieve desired contaminant treatment target |
| Dose Pacing | Automatic program that dims lamps to conserve power under various water quality and flow conditions while maintaining disinfection dose |
| Sleeve cleaning | Automatic, on line mechanical sleeve cleaning |
| UV Sensor | UV Dose sensor monitors UV output to ensure UV Dose accuracy, lamp dimming from 100 to 30% |