Effect of Lipid Content on Anaerobic Digestion Process and Microbial Community: Review Study

The indiscriminate release of significant amounts of food waste, fat oil and grease, and sewage sludge (SS) into the environment causes severe contamination in many nations. There are numerous potential treatment methods to cope with the organic wastes, but anaerobic digestion is currently widely accepted to handle different kinds of biological waste. One of the pillars supporting anaerobic digester biogas production increase in treatment plants is the use of fats in the wastewaters. However, it has been claimed that high-fat wastes, particularly mono-digestion in the anaerobic reactor, inhibits acetoclastic and methanotrophic bacteria, delays the formation of gas even more, and overtaxes the system. This paper examines the research on the impact of lipids on biogas enhancement, reactor inhibition, impact on the microbial communities, and co-digestion with lipids in the anaerobic digestion process

EFFECT OF SALT CONTENT ON BIOGAS PRODUCTION AND MICROBIAL ACTIVITY: REVIEW STUDY

Over the years, biogas production technology has advanced with the goal of lowering process costs and greenhouse gas emissions, increasing biogas yield. Many design factors and operational aspects must be taken into account for steady and efficient biogas production. Furthermore, by properly monitoring various operational factors, the operation can be changed to unforeseen events. This review study covers the changes that occur when salt is present in biogas generation, as well as the impact on the microbial population. The results of the studies showed that adding salt in appropriate amounts is sufficient to enhance gas production and nutrient release, but the optimal scenario may differ from one biogas plant to another. Moreover, unfavorable situations to be avoided during the operation of the biogas plant have been discovered. Previous research had found that when the sodium salt concentration is less than 8 g/L, the reduction in methane generation is negligible. On the other hand, the addition of >8 g/L NaCl significantly reduced methane production (causing 17-80 percent inhibition)

Effect of Lipid Content on Anaerobic Digestion Process and Microbial Community: Review Study

The indiscriminate release of significant amounts of food waste, fat oil and grease, and sewage sludge (SS) into the environment causes severe contamination in many nations. There are numerous potential treatment methods to cope with the organic wastes, but anaerobic digestion is currently widely accepted to handle different kinds of biological waste. One of the pillars supporting anaerobic digester biogas production increase in treatment plants is the use of fats in the wastewaters. However, it has been claimed that high-fat wastes, particularly mono-digestion in the anaerobic reactor, inhibits acetoclastic and methanotrophic bacteria, delays the formation of gas even more, and overtaxes the system. This paper examines the research on the impact of lipids on biogas enhancement, reactor inhibition, impact on the microbial communities, and co-digestion with lipids in the anaerobic digestion process