Online respirometer SN8
Online respirometry + artificial intelligence for biological process control
SN8 + SICAIR = a digital twin of the biological process
A living replica of the biological reactor that continuously syncs with the real activity of the sludge, anticipates its behaviour and acts on aeration.
SN8 · Sync with reality
Measures real sludge activity
The SN8 online respirometer measures the respiratory activity of the activated sludge 24/7, on site. It is the link between the physical process and its digital replica.
SICAIR · Model and action
Models, predicts and adjusts
A proprietary machine learning model reproduces the biological behaviour, predicts oxygen demand and adjusts aeration before the load arrives.
Dashboard · The window
See it all in real time
What is measured, predicted and adjusted, in one web dashboard accessible from any browser.
Not a simulation calibrated once. The twin continuously re-syncs with the real SN8 measurement: measure → model → predict → act → measure again.
The SN8 is an online respirometer that automatically and continuously measures biomass activity: organic matter degradation, nitrification and denitrification. Its data feeds the proprietary machine learning models of SICAIR (aeration) and SICTOX (toxicity), which turn respirometry into real-time control decisions. It includes oxygen, temperature, pH and Redox probes.
Tests and parameters
By means of the SN8 respirometer, the following tests are performed, which provide the following parameters continuously and automatically:
- Global Respirometry: OUR (mg O2/l.h), SOUR (mg O2/g.h)
- Nitrification rate: AUR (mg NH4/l.h), SAUR (mg NH4/g.h)
- Denitrification rate: NUR
- Hydraulic Retention Time (HRT)
- Oxygen needed
- Mud Age (TRC)
- Biodegradable COD
Applications
- AI aeration control (SICAIR): predicts the oxygen demand of the next cycle and adjusts the blowers.
- AI toxicity detection (SICTOX): early warning of toxic or inhibitory discharges.
- NITRIFICATION and DENITRIFICATION optimisation.
- Plants with DILUTION effects.
- Biodegradable COD calculation.
Why respirometry + AI
The activated sludge process is slow: any decision takes days to show its effect. That is why it is key to detect problems as early as possible and get it right from the start.
Physical or chemical measurements are not enough: you need direct information from the biomass and how the wastewater affects it. That is exactly what the SN8 measures. And our proprietary machine learning models learn from that respirometry to anticipate each plant’s behaviour, instead of reacting once the problem has already arrived.
SN8 advantages
- AI-ready data: every test feeds the SICAIR and SICTOX models.
- Automatic cleaning module in every test cycle.
- Integrated recirculation module during tests.
- Control of more than one reactor with a single unit.
- Low-maintenance sensors.
- Reproduces the process under real conditions.
- Can be installed at different points of the process.
- Integration with plant control: MODBUS TCP, 4-20 mA or 0-10 V outputs.
- Secure remote access, database and automatic alerts.
Electrical and software specifications
- SN8 web platform with trend charts and data history.
- Integration with SICAIR and SICTOX (machine learning models).
- Automatic calculation software for OUR/SOUR and AUR/SAUR.
- Secure remote access.
- WiFi and Ethernet connection. Modbus communication.
- Data export.
SN8: respirometry + AI for wastewater treatment plants
SN8 Summary of Benefits and Specifications
Key Benefits:
- Data for AI: directly measures biomass activity, the variable that feeds the SICAIR and SICTOX models.
- Automatic cleaning: cleaning module triggered in every test cycle.
- Operational flexibility: controls more than one reactor with a single unit and can be installed at different points of the process.
- Low maintenance: durable oxygen, pH, temperature and Redox probes.
- Real-time control: the AI turns every test into a setpoint for the plant.
- Full connectivity: MODBUS TCP, 4-20 mA or 0-10 V outputs, WiFi or Ethernet, with automatic alerts.
Technical Specifications:
- Tests: OUR/SOUR (overall respirometry), AUR/SAUR (nitrification rate), NUR (denitrification rate), HRT, SRT (sludge age) and biodegradable COD.
- Main applications: AI aeration control (SICAIR) and AI toxicity and discharge detection (SICTOX). Optimisation of nitrification, denitrification and plants with dilution effects.
- Design and technology: integrated recirculation module, web platform, automatic calculation software, trend charts and exportable history.
- Communications: WiFi, Ethernet and Modbus. Secure remote access.