Biogas apparatus: Climate Room Gp21 The normal procedure to determinemethanogenic activity involves inoculating a number of vials containing a smallamount of the target media with anaerobic inoculum, incubating them at acontrolled temperature, and periodically checking for the methane production bymanual sampling and determination of the volume of gas released, and analyzingthe gas composition using gas chromatography (GC). Moreover, the biogas produced and its methanecontent can only be measured periodically, making it impossible to obtainsatisfactory data to fully understand the degradation dynamics. Therefore,there is a need for a highly automated methane potential test that allows forthe collection of high quality data, that is less labor-intensive. AMPTS (Automatic Methane Potential TestSystem) From the biogas producers’ point of view,understanding the potential of a substrate to produce methane and its dynamicdegradation profile has a significant impact on the choice of organicwaste/material to digest when producing biogas, as well as provides a betterunderstanding of the quality of the raw gas produced from a biogas productionfacility. The instrument setup can be divided intothree units: A, B, and C: In the Sample Incubation Unit (unit A), up to 6 or 15 vials can be used containingsmall amounts of a sample with anaerobic inoculum are incubated at a desiredtemperature.
The media in each vial is mixed by a slow rotating agitator.Biogas is then continuously produced, a parameter which is used to estimate thebio methanation activity inside each vial. In the CO2-absorbing Unit (unit B), the biogas produced in each vial passesthrough an individual vial containing an alkaline solution. Several acid gasfractions, such CO2 and H2S, are retained by chemical interaction with NaOH,only allowing CH4 to pass through to the biomethane Gas Volume MeasuringDevice.
A pH indicator is added into each vial for controlling the acid bindingcapacity of the solution. Inthe Gas Volume Measuring Device (unit C), thevolume of CH4 gas released from unit B is measured using a wet gas flowmeasuring device with a multi-flow cell arrangement (6 or 15 cells). Thismeasuring device works according to the principle of liquid displacement and can monitor ultra-low gas flows; a digital pulse is generated whena defined volume of gas flows through the device.
An integrated embedded dataacquisition system is used to record, display and analyze the results. AMPTS – SAMPLE INCUBATION UNIT Maximumnumber of reactors per system: 15 Reactor materials: glass Standardreactor volume: 500 ml Power consumption: 1300 W (maximum) Dimension: 50×30×15cm Temperature control: up to 100 °C (precision 0.2 °C) Mixing in the reactor:mechanical (adjustable interval and speed), maximum speed 140 rpm AMPTS II CO2-ABSORPTIONUNIT CO2 absorption bottles: 15 Volume of CO2 absorption bottles:100 ml Dimension of unit: 44×30×6 cm Absorption liquid: 3 M NaOH with pHindicator, 80 ml per bottle (not included) Absorption efficiency: > 98%AMPTS II GAS VOLUME MEASURING DEVICE Workingprinciple: liquid displacement & buoyancy Up to 15 cellsrunning in parallel Built-in pressure and temperature sensors Integrated dataacquisition (maximum capacity 2×104 flow cell openings)1 Web based softwarerunning on embedded server Measuring resolution: 10 ml Detection capacity: upto 13 l cumulative gas per channel for each batch test Measuring range forinstant gas flow rate: 10 to 120 ml per min2 Power consumption: 15 W (average),28 W (maximum) Dimension: 51×44×18 cm Accuracy: 5% (RE) and Precision: 1% (CV)