Anaerobic digesters fail silently. A pH drift from 7.4 to 6.9 over four days represents a VFA accumulation event that crashes methane yield by 30–40% and takes 2–3 weeks to recover. A feedstock C:N ratio pushed outside the 25:1 window degrades microbial balance over 10–14 days before any operator notices reduced gas output. iFactory's AI platform monitors digester biology, feedstock chemistry, and CHP performance continuously — detecting deviation patterns days before they manifest as yield loss or plant upsets. Book a free anaerobic digestion analytics assessment.
Quick Answer
iFactory monitors pH, VFA, alkalinity, OLR, temperature, and gas composition across every digester stage — classifying biological stress events before they cause yield loss. Average result: 25% increase in methane yield, 40% reduction in plant upsets, CHP availability above 95%.
Digester Failure Modes iFactory Detects & Prevents
Every parameter iFactory tracks maps directly to a biological or mechanical failure mode — with a corrective action protocol, not just an alarm. Book a demo to see failure mode analytics applied to your plant.
VFA / pH Drift Early Warning
72 hrsAdvance Warning
VFA accumulation precedes pH collapse by 48–72 hours. iFactory monitors VFA:alkalinity ratio and pH trend slope simultaneously — alerting operators when the ratio exceeds 0.4, before pH drops below 6.8. Corrective action guidance included: reduce OLR, add buffer, or adjust feedstock mix.
Alert before pH collapse — not after
Feedstock Optimisation & OLR Control
C:NRatio Continuous Tracking
iFactory tracks incoming substrate VS content and C:N ratio — calculating the optimal feed blend and OLR in real time. High-ammonia batches are flagged before entering the digester. Methane yield per tonne VS is tracked per feedstock type to identify highest-value input streams.
Optimal blend calculated before feeding
Biogas Yield Prediction & Gas Quality
48 hrsMethane Forecast
iFactory predicts methane output 24–48 hours ahead based on biological state, feedstock composition, and digester temperature. Gas quality deviation (CH4% drop, H2S spike) is classified to its upstream cause: biological stress, feedstock shift, or temperature excursion.
Forecast-driven CHP dispatch — not reactive
CHP Engine Predictive Maintenance
95%+Engine Availability
iFactory monitors cylinder temperatures, oil pressure, exhaust temperatures, and vibration per cylinder — detecting valve, piston, or turbocharger faults weeks before unplanned shutdown. Oil intervals are condition-triggered, not fixed-hour.
Per-cylinder fault classification — not engine-level alarm
SCADA / PLC Integration
OPC-UANative Integration
iFactory connects to existing SCADA and PLC infrastructure via OPC-UA, Modbus, and MQTT — no additional hardware required for most plants. Where inline VFA analysers are absent, iFactory's soft-sensor module infers VFA from pH, alkalinity, and gas flow correlations.
No new hardware for most configurations
Digestate Quality & Compliance Tracking
N / POutput Tracked Continuously
iFactory tracks digestate total solids, ammoniacal nitrogen, and phosphorus — correlating output quality to feedstock inputs. When output deviates from compliance thresholds, iFactory traces the upstream cause before a non-compliant load is dispatched.
Non-conformance prevented — not just recorded
Prevent Digester Upsets. Maximise Methane. Run CHP Above 95% Availability.
iFactory connects to your existing SCADA and lab data. First biological stress alerts and yield predictions active within 4–6 weeks — no new hardware required for most plants.
iFactory Deployment Roadmap for Biogas Plants
iFactory is structured as a phased deployment — delivering value from existing data before any new instrumentation is added.
Phase 1
Data Assessment & Baseline Audit
Weeks 1–2
iFactory audits your existing SCADA historian, lab records, and CHP engine logs to identify detectable failure modes and current yield gaps — before any software is deployed.
Deliverable: Failure mode detectability report + sensor gap map
Phase 2
SCADA Integration & Model Build by Ifactory
Weeks 2–4
OPC-UA / Modbus connection to SCADA. Historical data used to build plant-specific digester baseline, feedstock library, and CHP performance models — not generic templates.
Deliverable: Live SCADA feed + plant-specific AI models
Phase 3
Biological Alerting & Yield Forecasting Live
Weeks 4–6
VFA early warning, OLR optimisation, methane yield forecast, and CHP fault classification go live. Operators receive classified alerts with corrective action — not raw sensor alarms.
Deliverable: Full digester analytics + 48 hr yield forecast
Phase 4
Continuous Optimisation & Performance Reporting
Ongoing
iFactory refines models as plant operation evolves — new feedstocks, seasonal variation, equipment changes. Monthly reports track yield improvement, upset events prevented, and CHP availability.
Deliverable: Monthly yield report + model update cycle
Platform Capability Comparison
BioGasViewer, Weltec Biopower SCADA, Viessmann Biogas Monitor, and generic IoT platforms offer data logging and threshold alerts. iFactory differentiates on biological state classification, feedstock AI, predictive yield modelling, and CHP component-level fault detection. Book a comparison demo.
| Capability |
iFactory |
BioGasViewer |
Weltec SCADA |
Viessmann |
Generic IoT |
| Biological Monitoring |
| VFA:Alkalinity ratio early warning |
72 hr advance alert |
pH threshold only |
pH + gas flow |
Not available |
Not available |
| Biological stress classification + corrective action |
AI classified — action guided |
Not available |
Not available |
Not available |
Not available |
| Soft-sensor VFA (no inline analyser) |
pH + alkalinity inference |
Requires inline sensor |
Requires inline sensor |
Not available |
Not available |
| Feedstock & Yield |
| C:N ratio tracking + blend recommendation |
Real-time blend schedule |
Manual input only |
Not available |
Not available |
Not available |
| 24–48 hr methane yield forecast |
Biological state model |
Not available |
Not available |
Not available |
Not available |
| CHP & Infrastructure |
| CHP cylinder-level fault classification |
Per cylinder, per fault class |
Not available |
Engine-level alarm |
Engine-level alarm |
Not available |
| SCADA OPC-UA / Modbus native |
OPC-UA, Modbus, MQTT |
Limited protocols |
Weltec systems only |
Viessmann only |
Protocol dependent |
Based on publicly available product documentation as of Q1 2025. Verify current capabilities with each vendor before procurement decisions.
Measured Outcomes Across Deployed Plants
25%
Increase in Methane Yield Per Tonne VS
40%
Reduction in Plant Upsets & Inhibition Events
72 hrs
Advance Warning Before pH Collapse
95%+
CHP Engine Availability on Condition-Based Maintenance
48 hrs
Methane Yield Forecast Horizon for CHP Dispatch
4–6 wks
To Full Digester Analytics — No New Hardware
Zero
Unplanned CHP Stops from Gas Quality Deviation
50%
Reduction in Manual Lab Sampling Frequency
Which Digester in Your Plant Is Running Biologically Stressed Right Now?
iFactory's pre-deployment assessment reviews your existing SCADA historian and lab data to identify active biological stress patterns and yield losses — before any new software is installed.
From the Field
"Our digesters were running at 62–65% of theoretical methane potential. iFactory showed us it was operating pattern — we were over-feeding during peak VS availability, pushing VFA:alkalinity above 0.5, suppressing methanogen activity for days at a time. Within six months, specific methane yield was up 23%. The VFA early warning system has flagged four potential inhibition events — we corrected all four before gas output dropped."
Plant Operations Manager
4.2 MWe Agricultural & Food Waste Biogas Plant — UK
Frequently Asked Questions
QWe only have pH and gas flow meters — no inline VFA analyser. Can iFactory still work?
Yes. iFactory's soft-sensor module estimates VFA from pH trend, alkalinity titration results, gas flow, and temperature — parameters in most existing SCADA systems. The pre-deployment assessment identifies which failure modes are detectable from your current sensor set.
Book a sensor gap assessment.
QHow does iFactory handle multi-stage digestion — primary, secondary, and hydrolyser?
Each stage is modelled independently with stage-appropriate parameters. A VFA accumulation in the primary that will propagate to the secondary is flagged at source — giving operators intervention time before the secondary is affected.
QWhat CHP engine makes does iFactory support for predictive maintenance?
All major biogas CHP platforms — Jenbacher (INNIO), MWM, Caterpillar, MAN, and Cummins — via SCADA or engine controller OPC-UA. Fault detection uses cylinder temperature asymmetry, exhaust deviation, oil pressure trend, and vibration signatures available across all platforms.
QCan iFactory optimise feedstock blending with variable weekly substrate availability?
Yes. iFactory maintains a feedstock library per plant — VS content, C:N ratio, BMP, and inhibition risk per substrate. When availability changes, it recalculates the optimal blend and outputs a daily feed schedule in tonnes per substrate type.
See feedstock optimisation in a demo.
Continue Reading
Biological Intelligence for Every Digester — Not Just Alarms. Classification.
iFactory maps every failure mode across your biogas plant — VFA drift, feedstock imbalance, gas quality deviation, and CHP faults — with corrective action guidance delivered automatically. Full fleet analytics in 6 weeks.
VFA Early Warning
Feedstock Blend Optimisation
Methane Yield Forecast
CHP Fault Classification
No New Hardware Required
