Operation and development of at-line control strategy for the biogas plant in Hamburg

Increased fossil fuel usage have affected all over the world and living organisms in negative way. Because of that, renewable energy had a good place in research areas about application of renewable energy. Biogas production by anaerobic digestion technology have been consideredas a new energy source. Application of anaerobic digestion technology offers new research oppurtunities to improve implementation in better way. Improving of on-line monitoring systems for biogas plants nowadays is significant topic. However, NIR spectroscopy is used as at-line controlling method, it is possible to integrate this system to biogas plant as an on-line monitoring method, which gives better monitoring oppurtunity. On the other hand, different kind of susbstrates have been used at biogas plants for years. With the aim of improving biogas production efficiency of biogas plants, new substrates usage in single way or as mixture is another topic to be improved. This thesis rewievs general operation of a pilot scale biogas plant and development of NIR spectroscopy implementation as on-line monitoring system. Biogas plants monitoring was conducted with daily, weekly, monthly and yearly controls. Laboratory analyses were applied weekly to analyse DM, oDM, pH, FOS/TAC, NH4-N, TNCD, VFA and HCO3-. 24 number of samples from biogas plant were used to improve calibration model for biogas plant monitoring parameters. Usability of parameters were evaluated depend on value of correlation coefficient (R2) and value of Ratio of Performance to Derivation (RPD) . Based on previous researches, results were worth for biogas plant samples. It is necessary to continue further researches.