Engineering Tool · Water Treatment

UV Disinfection Designer

Use entered UVT capacity reference points to screen reactor count, standby units, and operating power.

Municipal Drinking WaterStage 05 — Disinfection

Status: Available

PROJECT · OPTIONAL

Project metadata

Optional report context; it does not change calculations.Edit detailsHide details

ProjectOptionalFacilityOptionalPrepared byOptionalRevisionOptionalNotesOptional report context

01 · USER INPUT

Design basis and inputs

Plant design flow *m3/h · total flow assigned to the UV reactor bankDesign UV transmittance *% · must exactly match an entered UVT point unless authorized interpolation is selected; use the same wavelength and path lengthUser target dose *mJ/cm2 · user-selected target; must match the entered reference-dose valueEntered reference dose *mJ/cm2 · user-entered dose reference for the reactor performance/reference dataStandby reactor count *reactors · standby units are not assumed energizedPer-reactor electrical powerkW · optional; blank or zero reports operating power as unavailableManufacturer / modelOptionalExternal validation/reference sourceOptionalReference notesOptional

My external validation/reference source permits linear interpolation of this capacity relationship between the entered points for the applicable reactor/model, target/reference dose, UVT basis, lamp/configuration basis, and operating envelope.

Leave this off for exact entered reference points. When on, document the source above and confirm it covers this reactor/model, target/reference dose, UVT basis, lamp/configuration, and operating envelope. ATLAS does not independently verify the source or interpolation rule.

Entered reactor performance/reference data

Enter two or more unique UVT points for one reactor at the entered reference dose. Rows can be entered in any order.

UVT (%)	Entered reference flow capacity (m3/h/reactor)	Remove
Reference point 1 UVT (%)	Reference point 1 flow capacity in cubic metres per hour per reactor
Reference point 2 UVT (%)	Reference point 2 flow capacity in cubic metres per hour per reactor

Use UVT values at the same wavelength and optical path length as the entered external reference data; EPA UVDGM commonly uses 254 nm and 1 cm. No absorbance or path-length conversion is applied. Each UVT must be greater than 0% and no more than 100%. Each entered reference flow capacity must be positive. Duplicate UVT values are rejected.

Runs locally in this browser from entered reactor performance/reference data.

02 · CALCULATED RESULT

Engineering results

Enter a design basis and reactor performance/reference data, then calculate a screening result.

03 · REPORTING

Exports and verification

Exports include the entered external reference basis, performance points, and calculated reactor sizing.

Verification suite

Calculation revision 1.2

58 focused fixtures: The focused UV suite covers entered-point sizing, reactor counts, optional power, point normalization, traceability, readable reports, and extrapolation guards; R1 authorization regressions are maintained in the Stage 05 audit suite..

Engineering Basis

Methodology

Sizes duty and standby reactor counts from entered external UVT/capacity reference points, using an exact point by default. Interpolation is allowed only when the documented external source authorizes it for the applicable reactor and operating envelope; there is no extrapolation or automatic regulatory dose credit.

At an exact design UVT match, capacity is taken from that exact entered reactor performance/reference point.

For an intermediate UVT, bounded linear interpolation is available only when the user confirms that the external validation/reference source permits this capacity relationship for the applicable reactor/model, target/reference dose, UVT basis, lamp/configuration basis, and operating envelope, and documents that source. This interpolation is user-authorized from entered external reference data; ATLAS does not independently validate it. No extrapolation is used.

EPA UV reactor validation is based on reactor-specific validated operating conditions. Dose/RED relationships with flow, UVT, lamp status/intensity, and other operating parameters depend on the reactor and validation method. ATLAS does not derive a generic UV dose-monitoring equation. Boundedness alone does not establish that linear interpolation is valid.

UVT values must use the same wavelength and optical path length as the entered external reference data; no absorbance or path-length conversion is applied.

Duty reactor count = ceiling(plant design flow / capacity per reactor from entered external reference data). Installed count = duty reactors + entered standby reactors.

Operating duty power = duty reactors x entered per-reactor electrical power. Standby reactors are not assumed energized.

The user-selected target dose must match the user-entered reference-dose value; neither dose value is calculated by this tool.

Scope / Limitations

An exact entered reference point is the default. Bounded linear interpolation is available only when the user documents that the external source authorizes it; the tool does not extrapolate or establish validated UV dose credit.
This is a screening calculation over user-entered reactor performance/reference data. The tool does not verify the external source or the entered data and does not establish regulatory UV dose credit.
Lamp power, flow, and UVT alone are not used to derive UV dose. The tool does not model reactor physics or CFD.
No theoretical fluence, RED, Validation Factor, pathogen dose requirement, organism-specific log inactivation, dose-monitoring equation, lamp/intensity physics, organism credit, manufacturer selection, or regulatory compliance logic is calculated.
Use the UVT wavelength and path length specified by the external source (EPA UVDGM examples commonly use 254 nm and 1 cm).

Engineering Path

Upstream Context

Targeted advanced-treatment basis Only carry forward an adsorption or oxidation barrier when a named water-quality objective supports it.

Current Tool Decision

UV Disinfection Designer Use entered UVT capacity reference points to screen reactor count, standby units, and operating power.

Downstream Engineering Step

Clearwell & Storage Turnover Designer Coordinate the selected disinfection approach with storage and finished-water checks; a screening result is not regulatory credit.