A biogas plant's result is decided by day-to-day operation: process stability, monitoring, equipment servicing and safety.
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The National Centre for Research and Development has launched, as pre-commercial procurement, the "Innovative Biogas Plant" and "Wastewater Treatment Plant of the Future" initiatives. Aim: automated biomethane technology from waste and new solutions for sludge management.
From the silage clamp to the digestate tank: an overview of all the elements of a typical agricultural biogas plant, their functions and the dependencies between them.
Enzymes, trace elements, biochar, zeolite, microbial preparations. How to assess suppliers' promises and how to design a test that will show the real effect.
Thermal hydrolysis breaks down cell structures at elevated temperature and pressure. We explain the principle, typical parameters, the benefits for sludges and the heat balance.
Mechanical, thermal, chemical, enzymatic, ultrasonic. We compare pretreatment methods in terms of effect, energy cost and application in agricultural biogas plants.
What the requirement of 70 °C/60 min and particles up to 12 mm means for animal by-products, when to apply it and how a hygienisation tank is designed.
Plastic, metal, stones and sand shorten the life of pumps and settle in the digester. An overview of size reduction methods and of separating contaminants before the digester.
Silage, manure and straw enter the digester through a feeder. We compare screw, piston, conveyor and feed-wagon feeders and show how to choose capacity and avoid failures.
Pumping slurry, digester slurry and digestate is a job for several types of pump. We compare features, applications, wear and typical failures.
Mixing determines homogeneity and the distribution of sediments and scum. We compare submersible, central and long-shaft mixers, and the criteria for selection, energy use and servicing.
How to start a new or emptied digester: filling, inoculum, gradual heating, gas control and a safe path to the full feed rate over weeks.
Foam in the digester can block gas pipelines and damage the roof. We set out the causes, immediate measures, antifoams and prevention.
Acidification is the most common process failure. A table of symptoms and causes, a rescue procedure and the rules for restarting after a crisis.
The biogas technology supplier agriKomp Polska announced the construction of four installations. Some of them may produce biomethane in future if the regulations change.
On 28 July 2020 a 50 MW power plant made up of 114 modules of 440 kW each, fuelled by by-product hydrogen from the Hanwha Total petrochemical plant, was officially completed in Daesan.
HRT is the residence time of the liquid, SRT — the residence time of the microorganisms. In a flow-through digester they are equal, in systems with recirculation they are not.
The company H. Cegielski-Poznań holds a licence to produce Dynamic Biogas plants. A 0.5 MW pilot is operating at the experimental farm of the Poznań University of Life Sciences in Przybroda.
OLR is the mass of volatile solids fed per m³ of digester per day. We show the formula, a worked example, typical ranges and the effects of overloading.
FOS/TAC is the ratio of volatile organic acids to alkalinity. We explain the titration method, typical ranges, interpretation pitfalls and the role of the trend.
Mesophilic (approx. 35–42 °C) or thermophilic (approx. 50–58 °C)? We compare the rate of degradation, hygienisation, heat balance, stability and ammonia risk to help choose the regime.
