RDKit-checked air and off-gas markers covering sulfur odors, amines, greenhouse gases, NOx chemistry, and thermal byproducts
Docker-Generated Air + Off-Gas Gates
Air Emissions Gate Lab
A 3D emissions workspace for testing whether sewage-to-fuel operations can control sulfur odors, amines, NOx and N2O pathways, methane leakage, thermal-unit emissions, and upset fallback destruction before release claims are promoted.
containment, polishing, measurement, source-reduction, and upset-response gates scored for release readiness
top current gate because steady-state controls are incomplete without explicit upset routing and destruction logic
selected capture, sulfur, amine, thermal, measurement, and fallback controls for the first emissions package
fallback and upset
Upset fallback routing and emergency flare/destruction logic
Emergency routing for off-spec vents, upset gas, and odor excursions with explicit trigger and recovery logic.
Define upset triggers, destruction path capacity, startup/shutdown behavior, and safe return-to-normal criteria with logged evidence.
- Temperature
- 900 C
- Residence
- 0.7 s
- Measurement
- 80
- Est. reduction
- 83.4%
Pyomo-formulated air-emissions selector with deterministic enumeration across capture, sulfur, nitrogen/GHG, measurement, thermal tuning, and upset-fallback constraints. Current package covers 6 gate categories and 15 air markers.
Markers tied to this gate
Hydrogen sulfide; Ammonia; Carbon monoxide; Methane; Hydrogen cyanide
The marker set spans sulfur odors, amines, greenhouse gases, NOx precursors, acid gases, toxic combustion byproducts, and volatile heterocycles so emissions decisions are not reduced to one metric.
- Top marker
- Hydrogen sulfide
- Experiments
- Thermal oxidation and fallback destruction upset run
The selected package keeps upset destruction, sulfur polishing, amine polishing, capture, and AP-42 reconciliation together so controls can be demonstrated under both steady and upset conditions.
Current emissions decision
Fuel readiness is not air-release readiness
The fuel route should not be treated as release-ready until containment, sulfur and amine polishing, CH4 and N2O accounting, stack-factor reconciliation, and upset fallback destruction are measured together across the same operating windows.
6 categories are covered by the selected Docker-generated emissions package.
Sulfur odor burden remains a lead risk signal and is paired with fallback logic rather than single-step polishing claims.
Odor reduction potential is available, but only when capture and polishing are maintained under upset loading.
High-impact CH4 and N2O controls still require measured annual closure to support carbon-intensity claims.
Selected air package
Six gates that must pass before air-release claims should be promoted
Upset fallback routing and emergency flare/destruction logic
Score 100.7; odor 86; GHG 76; sulfur 84; nitrogen 72. Proof required: Define upset triggers, destruction path capacity, startup/shutdown behavior, and safe return-to-normal criteria with logged evidence.
Covered headspace and negative-pressure capture network
Score 98.4; odor 88; GHG 46; sulfur 84; nitrogen 64. Proof required: Demonstrate full-facility duct balance, no fugitive bypass, and community-boundary odor reduction under worst-case sludge windows.
Alkaline oxidative sulfur polishing
Score 93.3; odor 94; GHG 28; sulfur 98; nitrogen 34. Proof required: Show sustained sulfur removal across normal and upset loading with corrosion management and scrubber blowdown controls.
Regenerative thermal oxidation for odor and VOC peaks
Score 92.5; odor 90; GHG 56; sulfur 52; nitrogen 66. Proof required: Demonstrate destruction efficiency and burner emissions with clear conditions for when RTO is engaged versus bypassed.
Acid scrubbing for NH3 and amine off-gas
Score 88.5; odor 74; GHG 42; sulfur 18; nitrogen 92. Proof required: Quantify NH3 and amine breakthrough against influent spikes and verify spent-media chemistry does not create transfer risks.
AP-42 and stack-test reconciliation for thermal units
Score 84.2; odor 14; GHG 58; sulfur 70; nitrogen 68. Proof required: Reconcile AP-42 based estimates with measured stack tests and document where local facility behavior differs from defaults.
Gate ledger
Each gate is scored against control strength, measurement power, and implementation burden
Upset fallback routing and emergency flare/destruction logic
- Score
- 100.7
- Odor
- 86
- GHG
- 76
- Measure
- 80
Covered headspace and negative-pressure capture network
- Score
- 98.4
- Odor
- 88
- GHG
- 46
- Measure
- 78
Alkaline oxidative sulfur polishing
- Score
- 93.3
- Odor
- 94
- GHG
- 28
- Measure
- 76
Regenerative thermal oxidation for odor and VOC peaks
- Score
- 92.5
- Odor
- 90
- GHG
- 56
- Measure
- 82
Acid scrubbing for NH3 and amine off-gas
- Score
- 88.5
- Odor
- 74
- GHG
- 42
- Measure
- 72
Biofilter polishing for low-concentration odor plumes
- Score
- 86.3
- Odor
- 82
- GHG
- 24
- Measure
- 66
Sidestream deammonification plus N2O bioscrubber
- Score
- 85.8
- Odor
- 46
- GHG
- 96
- Measure
- 86
AP-42 and stack-test reconciliation for thermal units
- Score
- 84.2
- Odor
- 14
- GHG
- 58
- Measure
- 94
Hydrotreatment heteroatom closure before combustion claims
- Score
- 81.8
- Odor
- 22
- GHG
- 54
- Measure
- 86
Continuous CH4 and N2O measurement with annual ledger closure
- Score
- 76.6
- Odor
- 18
- GHG
- 82
- Measure
- 100
Category ledger
The package keeps capture, polishing, accounting, source reduction, and fallback controls linked
- Gates
- 1
- Score
- 100.7
- Odor
- 86
- GHG
- 76
- Gates
- 1
- Score
- 98.4
- Odor
- 88
- GHG
- 46
- Gates
- 1
- Score
- 92.5
- Odor
- 90
- GHG
- 56
- Gates
- 2
- Score
- 89.8
- Odor
- 88
- GHG
- 26
- Gates
- 2
- Score
- 87.2
- Odor
- 60
- GHG
- 69
- Gates
- 1
- Score
- 81.8
- Odor
- 22
- GHG
- 54
- Gates
- 2
- Score
- 80.4
- Odor
- 16
- GHG
- 70
Selected experiment package
The first package links odor mapping, GHG closure, upset runs, and stack reconciliation
Capture network balancing and community-boundary test
Duct balancing, leak checks, and downwind odor/chemical checks during peak sludge handling periods.
Confirms source capture is real at boundary conditions before claiming odor risk is solved.
Facility odor map with sulfur and amine speciation
Zone-by-zone gas sampling for H2S, mercaptans, NH3, and amines with simultaneous airflow and boundary-complaint alignment.
Finds dominant sources before spending capital on full-facility capture and polishing hardware.
Thermal oxidation and fallback destruction upset run
Intentional upset envelope tests for VOC/N-toxicity peaks with flare/RTO trigger logic and re-entry criteria.
Verifies safety and compliance during non-steady operation rather than only under design-point assumptions.
CH4 and N2O campaign plus annual ledger reconciliation
Continuous CH4 and campaign N2O monitoring with mass-balance closure and reporting-factor reconciliation.
Prevents carbon-intensity and climate claims from being detached from measured site emissions.
Hydrotreatment heteroatom closure to stack-proxy test
Track feed-to-product N/S/Cl closure across upgraded fractions and connect to combustion proxy emissions.
Shows whether upstream upgrading actually reduces downstream air burden.
Biofilter seasonality and humidity stress run
Measure biofilter removal under seasonal temperature and humidity swings with pressure-drop and media aging data.
Avoids overclaiming biofilter performance from short favorable windows.
AP-42 factor audit against measured stack performance
Compare AP-42 estimates with measured thermal-unit tests, then document site-specific correction factors.
Replaces generic emission estimates with local measurements for permit and management decisions.
Molecular marker ledger
Markers that keep sulfur odors, amines, greenhouse gases, NOx pathways, and toxicity visible
Hydrogen sulfide H2S
- Priority
- 68.6
- Odor
- 96
- GHG
- 8
- Toxicity
- 94
Ammonia H3N
- Priority
- 65
- Odor
- 84
- GHG
- 18
- Toxicity
- 74
Methanethiol CH4S
- Priority
- 60.5
- Odor
- 92
- GHG
- 6
- Toxicity
- 66
Dimethyl disulfide C2H6S2
- Priority
- 59.4
- Odor
- 88
- GHG
- 12
- Toxicity
- 58
Dimethyl sulfide C2H6S
- Priority
- 57.9
- Odor
- 86
- GHG
- 10
- Toxicity
- 54
Phenol C6H6O
- Priority
- 54.9
- Odor
- 52
- GHG
- 12
- Toxicity
- 78
Methane CH4
- Priority
- 53.3
- Odor
- 8
- GHG
- 98
- Toxicity
- 20
Pyridine C5H5N
- Priority
- 52.8
- Odor
- 46
- GHG
- 18
- Toxicity
- 72
Hydrogen cyanide CHN
- Priority
- 52.3
- Odor
- 18
- GHG
- 20
- Toxicity
- 96
Nitrous oxide N2O
- Priority
- 51.8
- Odor
- 4
- GHG
- 100
- Toxicity
- 24
Sulfur dioxide O2S
- Priority
- 49.6
- Odor
- 16
- GHG
- 30
- Toxicity
- 78
Hydrogen chloride HCl
- Priority
- 49.4
- Odor
- 28
- GHG
- 12
- Toxicity
- 76
Nitrogen dioxide NO2
- Priority
- 49.2
- Odor
- 10
- GHG
- 42
- Toxicity
- 72
Carbon monoxide CO
- Priority
- 48.3
- Odor
- 4
- GHG
- 34
- Toxicity
- 82
Acetonitrile C2H3N
- Priority
- 47.1
- Odor
- 26
- GHG
- 22
- Toxicity
- 62
Nitric oxide NO
- Priority
- 45.6
- Odor
- 6
- GHG
- 44
- Toxicity
- 58
Carbon dioxide CO2
- Priority
- 37.9
- Odor
- 2
- GHG
- 52
- Toxicity
- 16
Oxygen O2
- Priority
- 19.8
- Odor
- 0
- GHG
- 0
- Toxicity
- 0
Highest marker priorities
Hydrogen sulfide, ammonia, mercaptans, N2O, methane, and nitrogen toxics lead the first watch list
Hydrogen sulfide
acute odor and corrosion marker for sulfur-focused controls. Treatability 82; persistence 64; source IDs air-epa-odor-factsheet; air-epa-ap42-ssi-background.
Ammonia
odor and nitrogen off-gas marker requiring capture and polishing. Treatability 88; persistence 68; source IDs air-epa-odor-factsheet; air-watres-htl-review-2026.
Methanethiol
sulfur odor marker for polishing train and boundary complaints. Treatability 74; persistence 70; source IDs air-epa-odor-factsheet.
Dimethyl disulfide
sulfur control marker for strong oxidative polishing. Treatability 72; persistence 74; source IDs air-epa-odor-factsheet.
Dimethyl sulfide
odor and sulfur-recycle marker for aeration and scrubber control. Treatability 76; persistence 72; source IDs air-epa-odor-factsheet.
Phenol
odor and VOC toxicity marker for polishing design. Treatability 64; persistence 84; source IDs air-watres-htl-review-2026; air-htl-process-water-2025.
Methane
primary methane accounting marker for capture and destruction. Treatability 82; persistence 80; source IDs air-epa-ghgrp-subpart-ii-2026; air-ecfr-subpart-ii.
Pyridine
nitrogen aromatic marker linked to fuel upgrading and off-gas concerns. Treatability 58; persistence 86; source IDs air-watres-htl-review-2026; air-hydrotreatment-pilot-2026.
Full experiment ledger
Unselected runs stay visible as follow-on checks after the first control package
Capture network balancing and community-boundary test
Urgency 99.6; gate score 93.4. Confirms source capture is real at boundary conditions before claiming odor risk is solved.
Facility odor map with sulfur and amine speciation
Urgency 98.5; gate score 93.4. Finds dominant sources before spending capital on full-facility capture and polishing hardware.
Thermal oxidation and fallback destruction upset run
Urgency 97.8; gate score 96.6. Verifies safety and compliance during non-steady operation rather than only under design-point assumptions.
CH4 and N2O campaign plus annual ledger reconciliation
Urgency 97.7; gate score 82.2. Prevents carbon-intensity and climate claims from being detached from measured site emissions.
Hydrotreatment heteroatom closure to stack-proxy test
Urgency 92.6; gate score 83. Shows whether upstream upgrading actually reduces downstream air burden.
Biofilter seasonality and humidity stress run
Urgency 90.4; gate score 92.3. Avoids overclaiming biofilter performance from short favorable windows.
AP-42 factor audit against measured stack performance
Urgency 89.3; gate score 80.4. Replaces generic emission estimates with local measurements for permit and management decisions.
Sidestream deammonification and N2O bioscrubber pilot
Urgency 87; gate score 81.2. Tests whether sidestream concentration leverage reduces N2O emissions at practical energy and operations cost.
air-watres-htl-review-2026
Hydrothermal liquefaction of municipal sludge: biocrude production and fuel quality upgrading
Water Research review noting sludge biocrude heteroatom burden and combustion/upgrading risks, including NOx, NH3, and related emission implications.
Open sourceair-hydrotreatment-pilot-2026
Mild hydrotreatment as a stabilization step for nitrogen-rich sewage sludge biocrude in a pilot-scale trickle-bed reactor
Pilot hydrotreatment source reporting strong chlorine and sulfur removal but persistent nitrogen, keeping NOx and NH3 control visible.
Open sourceair-htl-process-water-2025
Aerobic biological treatment of HTL process water of sewage sludge
Process-water treatment source linking hazardous pollutants, nitrification inhibition, and air-energy interactions.
Open sourceair-rsc-thermal-review-2026
Thermal treatment options for biosolids management: a critical review
2026 thermal-treatment review covering emission characteristics, product streams, maturity level, and scale-up status.
Open sourceair-epa-odor-factsheet
EPA biosolids odor control in biosolids management
EPA odor fact sheet describing offensive sulfur compounds, ammonia, amines, and odor-control program practices at wastewater facilities.
Open sourceair-epa-ghgrp-subpart-ii-2026
EPA GHGRP Subpart II information sheet
EPA greenhouse gas reporting context for anaerobic wastewater treatment and methane calculation, recovery, and destruction metrics.
Open sourceair-ecfr-subpart-ii
40 CFR Part 98 Subpart II industrial wastewater treatment
Regulatory structure for methane reporting, emission calculations, monitoring, QA/QC, and records under Subpart II.
Open sourceair-epa-ap42-compilation-2026
EPA AP-42 Compilation of Air Pollutant Emissions Factors
EPA source identifying AP-42 as the primary compilation of emissions factor information and chapter-level updates.
Open sourceair-epa-ap42-ssi-2026
Final emissions factors for AP-42 Chapter 2 Section 2 sewage sludge incineration
EPA finalization of revised sludge-incineration emissions factors for AP-42 and related background data.
Open sourceair-epa-ap42-ssi-background
AP-42 Section 2.2 sewage sludge incineration background documentation
Background documentation describing sewage-sludge incineration process emissions, controls, and factor development.
Open sourceair-wst-n2o-review-2025
Critical review on end-of-pipe technologies for nitrous oxide removal at wastewater treatment plants
Open review on N2O off-gas mitigation at WWTPs, sidestream concentration differences, and bioscrubber-focused control architecture.
Open sourcethe fuel plan is not air-release-ready until containment, sulfur and amine polishing, greenhouse-gas control, measured emission accounting, and upset fallback procedures pass together. Modeling basis: air and off-gas validation gates for sewage-to-fuel pathways at wastewater facilities. Selected package: Upset fallback routing and emergency flare/destruction logic; Covered headspace and negative-pressure capture network; Alkaline oxidative sulfur polishing; Regenerative thermal oxidation for odor and VOC peaks; Acid scrubbing for NH3 and amine off-gas; AP-42 and stack-test reconciliation for thermal units.