PFAS / Activated Carbon Treatment

Stage 01 · Source basis

Influent Characterization

PFAS, matrix, flow, target.

Purpose

Declare the PFAS analyte set, measured concentration range, water matrix, flow envelope, and treatment or compliance objective that will govern the carbon evaluation.

Next decision

Decide what pretreatment is needed to protect the carbon bed.

Engineering questions

Which PFAS compounds, chain lengths, and concentration ranges govern?
What DOC/TOC, TDS, pH, temperature, and competing adsorbates are present?
Which seasonal or event-driven flow and quality cases must the vessels handle?

Key inputs

Flow and variabilitym³/h
Feed temperature°C
Feed TDSmg/L
Water matrix, pH, and competing adsorbatessite basis
Dissolved organic carbon (DOC)mg/L
Total organic carbon (TOC)mg/L
PFAS species and concentrations by chain lengthng/L
Treatment target / compliance basissite basis

Key outputs

Declared carbon-feed flow envelopesite basis
Declared PFAS species and concentration basisng/L
Declared DOC/TOC and competing-load basismg/L

Design Considerations

PFAS adsorption depends on compound, chain length, functional group, carbon type, and water matrix; a PFAS total alone is not a design basis.
DOC/TOC and other organic matter compete for carbon capacity and can change service behavior.
No dedicated ATLAS calculation tool currently covers PFAS species, chain-length, trace-level ng/L, matrix, or treatment-target characterization; establish this basis from representative analytical and project data before adsorption design.

Engineering guidance

Engineering guidancePFAS Influent CharacterizationNo ATLAS calculator covers PFAS influent characterization. Record analytes and chain lengths, ng/L range, matrix and DOC/TOC, flow variability, and treatment or compliance objective from representative analytical data.

Supporting research

No stage-specific research mapping is published for this boundary.

Stage 02 · Pretreatment

Pretreatment

Solids, organics, bed protection.

Purpose

Assess whether solids, colloid, or selected organic-load pretreatment is warranted to protect bed hydraulics and reduce avoidable fouling or competition.

Next decision

Fit or select a media basis before sizing the vessel.

Engineering questions

What suspended solids, colloids, oils, or organic load reach the carbon?
Would a selected UF/MF or chemical-conditioning step measurably improve the carbon-feed basis?
What residuals and post-treatment samples are needed to validate the pretreatment effect?

Key inputs

Pretreatment flowm³/h
Feed and candidate carbon-feed turbidityNTU
Suspended-solids / oil loadmg/L
Feed and candidate carbon-feed DOCmg/L
Feed and candidate carbon-feed TOCmg/L
Selected pretreatment chemical dose, if testedmg/L

Key outputs

Validated carbon-feed turbidity basisNTU
Validated carbon-feed DOC/TOC basismg/L

Design Considerations

UF/MF area and backwash sizing do not predict particle or PFAS removal efficiency; verify treated-water quality with project data.
The dosing calculator calculates a declared dose and batch basis; it does not select a chemical or predict coagulation, DOC removal, or PFAS response.
Pretreatment can change DOC competition, fouling, and residuals; establish the benefit with representative jar, pilot, or operating data.

Tools for this stage

Available UF/MF System Designer Conditional: size area, flux, and backwash only when measured solids or colloids justify an UF/MF pretreatment; no removal-performance prediction. Open tool Available Chemical Dosing Basis Calculator Conditional: calculate feed rate and batch mixing only after a compatible pretreatment chemical and dose are selected from project testing. Open tool Available Unit Converter Supporting: normalize flow and supported concentration units for selected pretreatment calculations; ng/L trace-PFAS conversion is not available. Open tool

Supporting research

No stage-specific research mapping is published for this boundary.

Stage 03 · Adsorption

Adsorption Sizing

Lab capacity, EBCT, bed design.

Purpose

Separate equilibrium adsorption screening from GAC contact and vessel sizing, then establish an explicit preliminary geometry and capacity/load basis.

Next decision

Choose a vessel arrangement and operating monitoring plan.

Engineering questions

Which representative-media capacity basis is defensible at relevant concentrations and matrix conditions?
What EBCT, superficial velocity, carbon mass, vessel dimensions, and pressure drop are being screened?
Is a capacity/load-based nominal life estimate adequate for this decision, or is project-specific pilot breakthrough evidence required?

Key inputs

Carbon-bed flowm³/h
Carbon-bed temperature°C
PFAS species, influent and target effluent basisng/L / site basis
User-entered capacity assumption matched to media and water basismg/g
User-selected reference target lifedays
Carbon bulk density and fill basiskg/m³
Target EBCT basismin

Key outputs

Required / installed carbon mass screenkg
Required / installed bed-volume screenm³
Actual empty-bed contact timemin
Capacity/load-based estimated bed life from entered assumptionsdays
Estimated bed pressure dropkPa

Design Considerations

Activated Carbon Sizing uses user-entered contaminant concentrations, target outlet, adsorption capacities, target life, density, grain size, and vessel geometry to calculate preliminary mass, bed-volume, EBCT, velocity, pressure drop, and a capacity/load-based estimated life.
That estimated life is not a PFAS breakthrough curve or validated field bed life; the tool does not model PFAS-specific chain-length behavior, competitive adsorption, DOC/TOC competition, pilot data, or lead/lag behavior.
Isotherm fitting is laboratory equilibrium interpretation. It can inform a capacity assumption but does not predict field breakthrough or media life.

Tools for this stage

Available Activated Carbon Sizing Primary: screen entered capacity/loading and vessel inputs for carbon mass, bed volume, EBCT, velocity, pressure drop, and capacity-based estimated life; it does not predict PFAS breakthrough. Open tool Available Adsorption Isotherm Screening Supporting: fit laboratory bottle-point Ce/qe data with Freundlich, Langmuir, or BET models; not a field breakthrough or bed-life predictor. Open tool

Supporting research

No stage-specific research mapping is published for this boundary.

Stage 04 · Adsorption

Lead/Lag Carbon Vessels

Lead/lag sequence and triggers.

Purpose

Define the lead/lag operating architecture, sampling access, isolation/bypass logic, and changeout response needed to manage observed breakthrough.

Next decision

Define breakthrough monitoring and the evidence needed for changeout.

Engineering questions

How many vessels and what lead/lag sequence protect the required response time?
Which influent, inter-vessel, and final-effluent sample points and changeout triggers apply?
How will isolation, bypass, equalization, and vessel changeover affect continuity and compliance?

Key inputs

Design and operating flow envelopem³/h
Preliminary per-vessel bed volumem³
Allowable operating pressure-drop envelopekPa
Final-effluent limits / action levelssite basis

Key outputs

Selected vessel count and lead/lag sequencedesign basis
Sampling points, changeover response, and operating-control basisdesign basis

Design Considerations

Lead/lag can provide a protective response window only when vessel sizing, sampling, triggers, and operations are validated together.
No current ATLAS tool models vessel-array operation, inter-vessel sampling, bypass/changeover logic, or response-time assurance.

Engineering guidance

Engineering guidanceLead/Lag Carbon VesselsNo dedicated ATLAS calculation tool currently available.

Supporting research

No stage-specific research mapping is published for this boundary.

Stage 05 · Monitoring

Breakthrough Monitoring

Compound-specific sampling.

Purpose

Use compound-specific samples and operating records to detect observed breakthrough, assess lead/lag protection, and define a changeout review trigger.

Next decision

Review replacement, disposal, or regeneration based on measured evidence.

Engineering questions

Which target PFAS, sample points, analytical methods, and detection limits define the monitoring basis?
What sampling frequency and operating flow/pressure records reveal changes in performance?
What validated result triggers lag-vessel transfer, media changeout, or immediate response?

Key inputs

Compound-specific influent / inter-vessel / effluent time seriesng/L
Operating flow historym³/h
Operating temperature history°C
DOC/TOC and relevant competing-load historymg/L
Bed differential-pressure historykPa

Key outputs

Observed compound-specific breakthrough evidencesite basis
Validated operating action / review triggersite basis

Design Considerations

Laboratory isotherm interpretation is not a field breakthrough model; it must not be used as an unvalidated field service-life prediction.
Observed breakthrough depends on PFAS species and chain length, DOC/TOC competition, pretreatment, carbon properties, hydraulics/channeling, and operating history.
No current ATLAS tool analyzes PFAS monitoring time series, predicts a breakthrough curve, or estimates a validated field changeout date.

Engineering guidance

Engineering guidanceBreakthrough MonitoringNo dedicated ATLAS calculation tool currently available.

Supporting research

No stage-specific research mapping is published for this boundary.

Stage 06 · Residuals

Replacement or Regeneration

PFAS-loaded media disposition.

Purpose

Document a changeout, reactivation/regeneration, disposal, or destruction route from observed performance and the spent-media contaminant basis.

Next decision

Carry the documented media decision into procurement, operations, and regulatory review.

Engineering questions

What measured evidence authorizes changeout or regeneration?
How will spent PFAS-loaded carbon be characterized, transported, permitted, and accepted?
Does the proposed regeneration or destruction route validate PFAS destruction and control secondary residuals?

Key inputs

Compound-specific breakthrough / effluent recordsite basis
Cumulative treated volume and operating historym³
Spent-media PFAS characterizationsite basis
Spent-media co-contaminant / matrix contextsite basis

Key outputs

Observed service period and changeout basisdays
Documented spent-media handling and disposition routedesign / compliance basis

Design Considerations

Adsorption transfers PFAS to the spent carbon; it does not destroy PFAS.
Spent media handling, transport, regeneration, disposal, and destruction validation depend on the specific contaminant record, jurisdiction, vendor process, and permits.
Changeout timing is an operating decision based on measured evidence; no current ATLAS calculator determines disposal route or validates PFAS destruction.

Engineering guidance

Engineering guidanceReplacement or RegenerationNo dedicated ATLAS calculation tool currently available.

Supporting research

No stage-specific research mapping is published for this boundary.

Search ATLAS engineering resources

PFAS & Activated Carbon Treatment

Primary Treatment Train

Engineering guidance — Stage 01 — PFAS Influent Characterization

Tools for Stage 02 — Pretreatment

Tools for Stage 03 — Adsorption Sizing

Engineering guidance — Stage 04 — Lead/Lag Carbon Vessels

Engineering guidance — Stage 05 — Breakthrough Monitoring

Engineering guidance — Stage 06 — Replacement or Regeneration

Influent Characterization

Engineering guidance

Supporting research

Pretreatment

Tools for this stage

Supporting research

Adsorption Sizing

Tools for this stage

Supporting research

Lead/Lag Carbon Vessels

Engineering guidance

Supporting research

Breakthrough Monitoring

Engineering guidance

Supporting research

Replacement or Regeneration

Engineering guidance

Supporting research

Research and Intelligence Context