BioDigester IoT Telemetry & TOC Monitor
TRL-3 Node
Hello, Field Tech! System operating stably on Day 0. Ready to monitor the biodigester?
Day 0
7.12 pH
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Services & Features
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System Status
pH Sensor Online · 7.12 pH (Optimal)
Gateway Node Active · 192.168.1.104
WhatsApp dispatch template ready for SPPG Team
LAB REMINDER
Periodic TOC Test Due?
Analytical testing tracks organic carbon conversion rate.
Log Sample →
Continuous Telemetry Monitoring
TRL-3 Prototype Node
Location
Prototype Lab
Active Gateway
ESP32 #01 (1.104)
Digester Status: Normal
Status Guide
7.12
Slurry pH
Sensor Parameters
Slurry pH
7.12
Analog SEN0161
Slurry Temp
27.4
°C · DS18B20
Biogas Flow
1.84
L/h · Counter
Lab TOC
8.4
mg/L · Lab Sample
Methane (CH4)
54.2
% · Sensor MQ-4
H2S Gas
68
ppm · MQ-136
* MQ-4 and MQ-136 sensors provide research-grade qualitative estimation.
Process Recommendations
Monitor pH every 6 hours. If pH drops below 6.5, introduce NaHCO3 buffer solution incrementally to preserve methanogenic activity.
Ambient room temperature (25 - 30°C) is normal for unheated digestion. Maintain lab environmental stability.
Field Incident Log: Notice an anomaly or hardware fault? Record parameters directly and dispatch to the SPPG team via WhatsApp.
Issue Category
Simulation Day
Current Slurry pH
Slurry Temp (°C)
Field Notes & Observations
Recent Field Reports
Organic Carbon Degradation Tracking
Standard TOC Protocol
Periodic Laboratory Testing
TOC analysis requires high-temperature catalytic combustion & NDIR spectrometry. ESP32 handles continuous pH & temp telemetry.
+ Record New TOC Sample
Day
TOC (mg/L)
TOC Degradation Curve
Periodic Sample Records
| Day | Sample ID | TOC (mg/L) | Status |
|---|
Biochemical Process Observation
Decreasing TOC values over time directly correlate with organic carbon conversion into methane-rich biogas.
Telemetry Dataset
24 logged records
| Timestamp | pH | Temp °C | Biogas (L/h) | TOC (mg/L) |
|---|
* CSV schema format is compliant with data logging pipelines and cloud analytics.
1. IoT Telemetry Pipeline
DIGESTER
→
SENSORS
→
ESP32
→
WI-FI
→
DASHBOARD
DIGESTER
- - →
LAB SAMPLE
- - →
TOC TEST
- - →
DASHBOARD
2. Digester Hardware Components
pH Sensor (SEN0161)
Continuous slurry acidity measurement
↓
Slurry Temp (DS18B20)
Waterproof 1-Wire probe · Slurry Temperature
↓
Sampling Port (TOC)
Manual valve for periodic analytical sampling
↓
Safety Relief Valve (SRV)
Over-pressure protection for vessel integrity
↓
ESP32 Edge Gateway
Sensor acquisition & Wi-Fi telemetry node (192.168.1.104)
Gas Hazard: Methane (CH4) & H2S
Biogas contains combustible CH4 and toxic H2S. Always operate in well-ventilated facilities with protective equipment.
Mandatory: Safety Relief Valve (SRV)
Physical vessels must have calibrated SRV installed to vent excess pressure safely as gas generation peaks.
SEN0161 pH Sensor 2-Point Calibration Wizard
Calibrate probe offset and slope using pH 4.00 and pH 7.00 buffer standards. Tap to open calibration guide →
Integrated Simulation Mode
Sensor values are realistically simulated to demonstrate IoT telemetry, WhatsApp dispatching, and sensor calibration workflows.
Why is TOC tested periodically in the laboratory?
Total Organic Carbon (TOC) analysis requires high-temperature catalytic combustion and NDIR spectrometry instruments in the lab rather than basic field probes.
What is the optimal slurry pH range?
The optimal range is 6.8 to 7.5. If pH drops below 6.5, methanogenic bacteria become inhibited due to accumulation of volatile fatty acids (VFA).