Biogas Training

Lesson 1 • Feedstock Types and Characteristics

Categorises organic feedstocks by origin, volatile solids content, and biogas yield potential. Connects feedstock selection to system design decisions covered in later chapters.

Lesson 2 • What Is Biogas

Defines biogas as a mixture of methane, CO2, and trace gases produced by microbial decomposition. Anchors the chapter by establishing the subject's scientific identity.

Lesson 3 • Anaerobic Digestion Biology

Explains the four-stage microbial process: hydrolysis, acidogenesis, acetogenesis, and methanogenesis. Provides the biological foundation for all subsequent process design topics.

Lesson 4 • Key Process Parameters

Identifies temperature, pH, C/N ratio, and hydraulic retention time as critical control variables. Understanding these parameters enables informed operational decisions throughout the course.

Lesson 1 • Contaminant Identification and Removal

Identifies physical, chemical, and biological contaminants that inhibit digestion or damage equipment. Removal strategies protect downstream processes and digestate quality.

Lesson 2 • Biogas Yield Estimation

Introduces biochemical methane potential tests and theoretical yield calculations from substrate composition. Yield data directly informs digester sizing in the next chapter.

Lesson 3 • Pre-treatment Technologies

Surveys mechanical, thermal, chemical, and biological pre-treatment methods that enhance substrate digestibility. Pre-treatment selection affects capital cost and energy balance.

Lesson 4 • Feedstock Sampling and Analysis

Covers representative sampling protocols and laboratory tests for total solids, volatile solids, and chemical oxygen demand. Accurate analysis underpins all yield calculations.

Lesson 1 • Mixing Systems and Strategies

Covers mechanical, pneumatic, and hydraulic mixing technologies and their effect on digestion efficiency. Proper mixing prevents stratification and ensures uniform microbial contact.

Lesson 2 • Digester Types and Selection

Compares continuously stirred tank, plug-flow, fixed-dome, floating-drum, and high-rate reactor designs. Selection criteria include feedstock type, scale, and available capital.

Lesson 3 • Hydraulic and Organic Loading Design

Calculates digester volume from hydraulic retention time and organic loading rate targets. These calculations form the quantitative core of any digester design project.

Lesson 4 • Heating and Insulation Systems

Designs heating systems to maintain mesophilic or thermophilic temperature ranges and calculates heat loss through insulation. Thermal management directly affects gas production rates.

Lesson 1 • Desulfurisation Technologies

Covers biological, chemical, and adsorption-based H2S removal methods and their operational requirements. H2S removal is the first critical step before any downstream use.

Lesson 2 • Moisture and Siloxane Removal

Explains condensation traps, refrigeration drying, and adsorption methods for moisture and siloxane control. Dry, clean gas protects engines and membranes from corrosion and fouling.

Lesson 3 • CO2 Removal and Biomethane Production

Compares water scrubbing, pressure swing adsorption, membrane separation, and amine scrubbing for CO2 removal. Each technology has distinct energy, cost, and methane-slip trade-offs.

Lesson 4 • Raw Biogas Composition and Impurities

Characterises hydrogen sulfide, moisture, siloxanes, and ammonia as key impurities requiring removal. Understanding impurity sources guides selection of appropriate cleaning technologies.

Lesson 1 • Emerging Utilisation Pathways

Introduces fuel cells, power-to-gas, and biogas-to-chemicals as advanced utilisation options. These pathways represent the frontier of biogas value chain development.

Lesson 2 • Direct Heat Applications

Explains biogas boilers, burners, and cooking applications for direct thermal energy delivery. Direct heat use is the simplest and most efficient conversion pathway for small systems.

Lesson 3 • Combined Heat and Power Generation

Covers gas engine, micro-turbine, and Stirling engine CHP systems and their electrical and thermal efficiencies. CHP maximises energy recovery and is the most common biogas end use.

Lesson 4 • Biomethane as Vehicle Fuel

Covers compressed and liquefied biomethane as transport fuel, including fuelling station design. Vehicle fuel use offers high-value biogas application in fleet decarbonisation strategies.

Lesson 1 • Digestate Stabilisation and Hygienisation

Explains pasteurisation, composting, and thermophilic digestion as pathogen reduction methods. Hygienised digestate meets quality standards for unrestricted agricultural use.

Lesson 2 • Digestate Composition and Quality

Characterises macronutrients, micronutrients, pathogens, and organic matter in raw digestate. Quality assessment determines safe and effective land application rates.

Lesson 3 • Digestate Storage and Handling

Designs covered storage facilities to minimise ammonia emissions and manage seasonal application constraints. Proper storage is essential for nutrient preservation and odour control.

Lesson 4 • Agronomic Application of Digestate

Calculates application rates based on crop nutrient demand, soil analysis, and nitrogen availability factors. Correct application maximises fertiliser value and prevents nutrient runoff.

Lesson 1 • Routine Monitoring and Sampling

Establishes daily, weekly, and monthly monitoring schedules for key process indicators. Consistent monitoring enables early detection of process imbalances before they escalate.

Lesson 2 • Automation and SCADA Systems

Introduces supervisory control and data acquisition systems for remote monitoring and automated control. Automation reduces labour costs and enables rapid response to process deviations.

Lesson 3 • Fault Diagnosis and Troubleshooting

Identifies symptoms of acidification, foaming, scum formation, and inhibition and prescribes corrective actions. Rapid fault diagnosis minimises downtime and prevents costly process failures.

Lesson 4 • Process Optimisation Techniques

Applies data analysis to adjust feeding schedules, mixing intensity, and temperature for maximum yield. Optimisation translates monitoring data into actionable operational improvements.

Lesson 1 • Gas Detection and Emergency Systems

Specifies fixed and portable gas detection equipment, alarm systems, and emergency shutdown procedures. Reliable detection systems are the last line of defence against catastrophic events.

Lesson 2 • Personal Protective Equipment and Confined Space Entry

Defines PPE requirements and confined space entry protocols for digesters, gas holders, and sumps. Confined space entry is among the highest-risk activities on a biogas plant.

Lesson 3 • Risk Assessment Methodologies

Applies hazard and operability studies, failure mode analysis, and bow-tie risk models to biogas plants. Structured risk assessment identifies critical controls before incidents occur.

Lesson 4 • Biogas Hazard Identification

Identifies flammability, asphyxiation, and toxicity hazards associated with methane, CO2, and H2S. Hazard awareness is the prerequisite for all subsequent risk control measures.