Strumento di ingegneria · Trattamento dell’acqua

Progettazione del pretrattamento delle acque reflue

Verifica portate, idraulica dei canali, capacità nominale di grigliatura e dissabbiatura, ridondanza e gestione facoltativa dei residui con dati espliciti di progetto e del fornitore.

Stato: Disponibile

01 · PROJECT AND FLOW BASIS

Headworks design inputs

The peak-hour input is entered as a flow rate for one hour. Required hierarchy checks enforce Minimum ≤ Average Day ≤ Maximum Day and Peak Hour ≥ Average Day. Peak Hour below Maximum Day is a basis-review warning only; event flow is outside this hierarchy.

Project / case Influent basis source / note

Required flow cases

Each flow includes source provenance.

Minimum Flowm³/dMinimum flow source Average Daily Flowm³/dAverage flow source Maximum Day Flowm³/dMaximum-day source Peak Hour Flowm³/hPeak-hour source

Bounded event / shock flow

Optional · requires a positive duration and source

Optional event flowm³/dBounding event durationhEvent name Event source

Screen capacity flow case Channel design / peak flow case

02 · SCREEN / CHANNEL EQUIPMENT

Installed and duty basis

Screen equipment ratings and channel hydraulics use separate counts. Each channel is modeled with the same entered width and operating depth, with equal flow split across channels in service.

Screen technology Installed screen equipment units Normally operating screen units Installed screening channel count Channels normally in service Channel widthmWater depthmRated hydraulic capacity per unitm³/dVendor / project capacity source

Require mapped flow with one installed screen unavailable and one normally active channel out

03 · SCREENING DESIGN

Opening area, velocity criteria, and headloss basis

Technology boundaryRepeated-bar geometry is available only for coarse/fine bar racks. Perforated plate, step, drum, and proprietary screens require vendor/project effective area or rated capacity. The EPA equation below is limited to a clean bar screen.

Effective open area

Geometry dimensions are projected normal to through-flow.

Effective open area method Clear opening spacingmProjected bar thicknessmVendor effective open area per representative channelm²Open-area basis provenance

Project velocity criteria

Calculated values are reported separately from declared criteria.

Minimum approach/channel velocity criterionm/sMaximum approach/channel velocity criterionm/sMinimum through-screen velocity criterionm/sMaximum through-screen velocity criterionm/sVelocity criterion source / jurisdiction

Screen headloss

Basis and flow point stay visible in results and exports.

Headloss method Headloss evaluation flow case

EPA clean bar-screen methodhL = (V² − v²) / (2 × 0.7 × g)V = velocity through bar openings; v = approach velocity. Clean bar screens only. Fouled loss is not inferred.

Maximum allowable headloss criterionmHeadloss criterion source

04 · CHANNEL HYDRAULICS

Minimum and design-flow channel checks

Approach velocity uses Q divided by the gross wetted area of the entered number of channels in service. Through-screen velocity uses effective opening area when the selected method supports it. Screen equipment capacity is evaluated from its separate duty count.

Velocity across explicit flow cases

Flow case	Total flow	Approach velocity	Through-screen velocity	Calculated / rated loss	Headloss basis / provenance	Duty utilization
Calculate to populate these values.

Capacity by flow case is available after calculation.

05 · GRIT REMOVAL

Technology-specific hydraulic and equipment basis

Horizontal-flow chamber velocity criteria are project inputs. Aerated and vortex/proprietary capacity is vendor/project-rated. No generic capture efficiency is predicted.

Grit technology Installed grit units / channels Normally operating grit duty units Grit capacity flow case Grit hydraulic check flow case

Require mapped flow with one grit unit/channel out

Geometry and hydraulic detention

Required rectangular active-channel geometry.

Channel / chamber widthmWater depthmChannel / chamber lengthm

Maximum horizontal velocity criterionm/sVelocity criterion source Minimum HRT criterionsMaximum HRT criterionsHRT criterion source

Optional declared performance basis

Never labeled as an ATLAS prediction.

Declared grit capture performance%Vendor / project performance source

06 · REDUNDANCY AND FAILURE CASES

Selected one-unit-out capacity and hydraulics

Failure scenarios use separate screen and channel counts: one screen out, one channel out, a paired screen-and-channel N−1 case, and all installed screens/channels. Vendor headloss curves are not extrapolated for failure cases.

Screen duty and failure-case checks

Scenario	Available screens	Active channels	Hydraulic capacity	Utilization	Capacity margin	Actual shortfall	Approach velocity	Through-screen velocity	Headloss	Headloss method / basis
Calculate to populate these values.

07 · OPTIONAL HANDLING BASIS

Screenings and grit quantities

Solids identity: influent TSS is not screenings and is not grit. Screenings and grit are separate from primary sludge and biological sludge. Quantities below require a declared measured/project/vendor rate.

Screenings handling basis

Calculate declared screenings handling quantities

Grit handling basis

Calculate declared grit handling quantities

08 · DETAILED RESULTS

Engineering values and limitations

Calculate a valid input snapshot to populate detailed results. Infeasible inputs do not expose a normal design result.

Revision ww-headworks-1.1.0 · deterministic local calculation · explicit project/vendor assumptions

Vendor-rated screen/grit performance must be verified for the selected equipment. Generic hydraulic screening does not predict proprietary capture efficiency. Influent TSS is not screenings production and is not grit production. This preliminary check does not replace equipment supplier hydraulic curves or detailed civil/mechanical design.

Questo strumento di ingegneria è attualmente disponibile solo in inglese.

Base ingegneristica

Metodologia

Verifica portate, idraulica dei canali, capacità nominale di grigliatura e dissabbiatura, ridondanza e gestione facoltativa dei residui con dati espliciti di progetto e del fornitore.

Ipotesi

Ambiente integrato per il pretrattamento. Non prevede l’efficienza proprietaria di cattura, non ricava grigliato o sabbia dai solidi sospesi influenti e non sostituisce curve del fornitore né la progettazione civile e meccanica di dettaglio.

Ambito / Limiti

Ambiente integrato per il pretrattamento. Non prevede l’efficienza proprietaria di cattura, non ricava grigliato o sabbia dai solidi sospesi influenti e non sostituisce curve del fornitore né la progettazione civile e meccanica di dettaglio.

Percorso ingegneristico

Contesto a monte

Base di progetto dell’influente delle acque reflue Ambiente integrato per il pretrattamento. Non prevede l’efficienza proprietaria di cattura, non ricava grigliato o sabbia dai solidi sospesi influenti e non sostituisce curve del fornitore né la progettazione civile e meccanica di dettaglio.

Decisione di questo strumento

Progettazione del pretrattamento delle acque reflue Verifica portate, idraulica dei canali, capacità nominale di grigliatura e dissabbiatura, ridondanza e gestione facoltativa dei residui con dati espliciti di progetto e del fornitore.

Passaggio ingegneristico a valle

Progettista di Equalizzazione delle Acque Reflue Valuti lo stoccaggio attivo e il volume operativo da un programma di portate in ingresso e uscita controllata. Opzionale: usare se la variabilità dichiarata giustifica l’equalizzazione. Inserire i valori manualmente; nessun trasferimento automatico.
Progettazione dei sedimentatori Ambiente integrato per il pretrattamento. Non prevede l’efficienza proprietaria di cattura, non ricava grigliato o sabbia dai solidi sospesi influenti e non sostituisce curve del fornitore né la progettazione civile e meccanica di dettaglio.

Headworks process train