On February 2, 2022, the School of Engineering and Technology congratulations to Assistant Professor Dr. Kesara Seneesrisakul Acting Head of Petrochemical and Polymers Department School of Engineering and Technology Walailak University (Mass.) has been published in the journal Energy, an international journal on energy in the database Scopus Quartile 1, Percentile : 98 by this work in collaboration with a team of researchers from Chulalongkorn University. who invented the 3-step ASBR system to produce biogas from organic wastewater in industrial plants The gas content is up to 98% compared to the theoretical value. Ready to help solve the problem of wastewater in industrial plants and adjust the condition of wastewater to COD (Chemical Oxygen Demand), which indicates that the pollution in the water is reduced by more than 90%.
Assistant Professor Dr. Kesara Seneesrisakul revealed that he has designed and tested a 3-step ASBR wastewater treatment system to produce biogas or biogas from organic wastewater of industrial plants. This system provides the best efficiency in eliminating waste from wastewater. It was measured at a reduction in COD of up to 90%, more than a typical single-stage or two-stage system with a maximum reduction of approximately 60-80%, and the biogas yield was comparable to that. Theoretically up to 98%, from about 60% conventional systems.
This research is a study of the invention of a 3-step industrial wastewater treatment system to develop a biogas production system from wastewater to be more efficient than the previous system. Most industrial plants today use a single-stage (single tank) wastewater treatment system to produce biogas from digestion of organic substances, such as wastewater from palm oil mills. cassava ethanol production plant cassava starch factory, etc., by using a group of microorganisms in the anaerobic group to aid digestion In general, there are 3 groups of microorganisms in the digestion tanks, each of which is responsible for digesting large molecules of wastewater until it becomes gas. Using a single tank system, all groups of microorganisms are integrated into one tank. in environmental conditions, including temperature, acidity The duration and the tank size are all the same. While research shows that the optimum conditions for the growth of each group of bacteria are different.
Assistant Professor Dr. Kesara added that The research team therefore conducted further research and found that Each group of microorganisms has requirements for optimal growth conditions, with Group 1 (hydrolysis bacteria and acidogens) digesting large organic molecules in wastewater into volatile fatty acids. It grows well at weak acidity or pH of about 5.5. Group 2 (acetogen) serves to convert volatile fatty acids into smaller molecules. It grows well at a pH of about 6 and the third group (Methanogen) converts the last molecule into biogas (Methane). It grows well at a pH of about 7. A tank volumetric ratio of 1:2:3, 1:1.5:5, provides the best efficiency in removing waste or COD from wastewater (90%), which is very high compared to a single tank system. and the yield of biogas compared to the theoretical value should be up to 98%
Assistant Professor Dr. Kesara said at the end that The results of the research also showed that biogas production with a 3-stage ASBR system also helps in maintaining the levels of nutrients needed by microorganisms. Because normally in a single tank system will precipitate of nutrients. also known as Micronutrients Which is a substance that microorganisms need like humans need vitamins in small quantities, but they are indispensable. In which the system is separated into 3 steps, there is no sedimentation. The essential nutrients remain in the system quite sufficiently for the functioning of all three groups of microorganisms, all of which are new knowledge gained from this research.
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