Engineering Tool · Wastewater Treatment

Wastewater Influent Basis

Convert wastewater flow and water-quality data into a hydraulic and mass-loading design basis for downstream treatment.

Status: Available

Project / basis

Identify this influent basis

Project details appear in the report and do not change the calculation.

Project name

Facility / process area

Influent point

Additional report details and interpretation

Author

Report date

Project note

Priority constituents

Interpretation context only. It does not create permit logic or effluent targets.

Primary sedimentation before referenced process

Literature comparison context

References appear only when sample point, process declaration, case, and sampling basis are compatible. They are not acceptance criteria.

Concentration case for literature context

Hydraulic basis

Average and peak flow

Start with average daily flow. Maximum-day, peak-hour, and minimum flows are optional.

Average daily flow

Required. Canonical basis: m³/d.

Declared flow source

Average flow period and location

Average-flow period / date

Average-flow location

Optional maximum-day, peak-hour, and minimum flows

For each case, choose either a direct flow or a factor. Only the selected input is shown.

Maximum-day flow

Optional · canonical m³/d

Maximum-day flow basis

Maximum-day flow

Maximum-day flow period / date

Maximum-day flow location

Declared flow source

Peak-hour flow

Optional · canonical m³/h

Peak-hour flow basis

Peak-hour flow

The declared interval remains one peak hour, even when displayed as an MGD rate.

Peak-hour flow period / date

Peak-hour flow location

Declared flow source

Does the peak hour fall within the declared maximum day?

Minimum-flow interval

Changing interval clears the entered minimum flow so it can be re-entered on the new basis.

Minimum-day flow

Also show peak scenarios using average concentrationsScenario loads are labeled ESTIMATE and remain separate from paired loads.

Influent quality

Average concentrations

Enter available values. Concentrations use mg/L with the analyte basis shown beside each label.

Common design-basis parameters

Leave unavailable values blank

BOD₅mg/L as O₂

CODmg/L as O₂

TSSmg/L

TKNmg/L as N

NH₄-Nmg/L as N

TNmg/L as N

TPmg/L as P

Alkalinitymg/L as CaCO₃

pHdimensionless

No mass load is calculated.

Temperature (°C)°C

Canonical storage: °C. No mass load is calculated.

Average concentration basis

Average sample/process point

Average sampling basis

Period, location, and source notes

Average concentration period / date

Average sample location

Average source / lab

Average note

Declare average flow and concentration records paired (coincident)Use when flow and concentration cover the same period and sample point. Unpaired loads remain ESTIMATE.

Additional parameters · VSS, orthophosphate-P, oil & grease, TDS, conductivity, custom

Optional average concentrations

VSSmg/L

Orthophosphate-Pmg/L as P

Oil & greasemg/L

TDSmg/L

ConductivityµS/cm

Conductivity reference temperature°C

Custom constituents

Up to five named concentrations. Custom rows do not feed built-in ratios.

Custom constituent 1 name

Custom constituent 1 average concentrationmg/L

Custom constituent 2 name

Custom constituent 2 average concentrationmg/L

Custom constituent 3 name

Custom constituent 3 average concentrationmg/L

Custom constituent 4 name

Custom constituent 4 average concentrationmg/L

Custom constituent 5 name

Custom constituent 5 average concentrationmg/L

Peak / variability

Optional peak concentration cases

Add a separate concentration record only when it is available for the matching maximum-day or peak-hour flow.

Maximum-day concentration record

Use a sample from the same 24-hour period as the maximum-day flow.

Maximum-day sample/process point

Maximum-day sampling basis

Period, location, and source notes

Maximum-day concentration period / date

Maximum-day sample location

Maximum-day source / lab

Maximum-day note

Declare maximum-day flow and concentrations paired (coincident)Use when flow and concentration cover the same period and sample point. Unpaired loads remain ESTIMATE.

Maximum-day concentrations

BOD₅mg/L as O₂

CODmg/L as O₂

TSSmg/L

TKNmg/L as N

NH₄-Nmg/L as N

TNmg/L as N

TPmg/L as P

Alkalinitymg/L as CaCO₃

Optional maximum-day analytes

VSSmg/L

Orthophosphate-Pmg/L as P

Oil & greasemg/L

TDSmg/L

Peak-hour concentration record

Use a sample from the same hour and location as the peak-hour flow.

Peak-hour sample/process point

Peak-hour sampling basis

Period, location, and source notes

Peak-hour concentration period / date

Peak-hour sample location

Peak-hour source / lab

Peak-hour note

Declare peak-hour flow and concentrations paired (coincident)Use when flow and concentration cover the same period and sample point. Unpaired loads remain ESTIMATE.

Peak-hour concentrations

BOD₅mg/L as O₂

CODmg/L as O₂

TSSmg/L

TKNmg/L as N

NH₄-Nmg/L as N

TNmg/L as N

TPmg/L as P

Alkalinitymg/L as CaCO₃

Optional peak-hour analytes

VSSmg/L

Orthophosphate-Pmg/L as P

Oil & greasemg/L

TDSmg/L

Advanced / Event basisOne bounded event or shock basisOptional · no recurrence or time-series modeling

Enter one declared event only. Event rate and integrated mass require event flow/concentration pairing; duration is required for integrated mass.

Include one event record

Optional · Available · Extends Wastewater Influent Basis

Wastewater Influent Basis — Acceptance Criteria Extension

Compare project-declared criteria with traceable influent cases. A comparison identifies a declared design or acceptance gap; it does not select a treatment process.

Primary Influent Basis ↑

This extension compares user- or project-declared acceptance criteria against traceable wastewater cases. It does not certify regulatory compliance, toxicity, treatability, or source acceptance.

ATLAS compares declared criteria. It does not determine which regulatory, utility, permit, or contractual limit applies to the project.

Comparison basis

Declare each observed case time basis

Must match the criterion

Sampling method, period, location, source, and point remain in the primary Influent Basis. Select the actual averaging or event context here; ATLAS will not infer it from a label or timestamp.

Average observed time basis

Unknown / not declared · unknown

Maximum day observed time basis

Unknown / not declared · unknown

Peak hour observed time basis

Unknown / not declared · unknown

Declared criteria

Project acceptance criteria

No project criterion is preloaded. Add limits and reference text supplied by the project or owner.

Comparison results

Declared acceptance criteria comparison

unavailable

A current accepted Influent Basis case is required. Editing the primary basis invalidates these comparison results until its new result is accepted.

Engineering Basis

Methodology

Hydraulic and mass-loading values are calculated from the declared flow and concentration for each paired case, with loads normalized to canonical SI units.

A measured peak load is reported only when flow and concentration are explicitly paired for that case; an average-hold scenario remains an estimate.

Assumptions

Flow factors and sample metadata are user-declared project inputs.
Missing data remain missing; the tool does not infer an unpaired concentration or load.

Scope / Limitations

This basis does not determine compliance, process acceptance, oxygen demand, chemical dose, equalization volume, or downstream equipment size.

Engineering Path

Upstream Context

Declared influent flow and sample data Enter project flow, concentration, sample basis, and source metadata as declared.

Current Tool Decision

Wastewater Influent Basis Establish a calculation-ready hydraulic and mass-loading basis while preserving explicit case pairing.

Downstream Engineering Step

Wastewater Equalization Designer These tools support separate process calculations. Values are not automatically transferred between tools.
Clarifier Designer These tools support separate process calculations. Values are not automatically transferred between tools.
BNRMatrix Biological Nutrient Removal These tools support separate process calculations. Values are not automatically transferred between tools.

Identify this influent basis

Average and peak flow

Maximum-day flow

Peak-hour flow

Average concentrations

Common design-basis parameters

Average concentration basis

Optional average concentrations

Custom constituents

Optional peak concentration cases

Maximum-day concentrations

Peak-hour concentrations

Declare each observed case time basis

Project acceptance criteria

Declared acceptance criteria comparison

Engineering Basis

Methodology

Assumptions

Scope / Limitations

Engineering Path

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