A Review of Biochemical Process of Anaerobic Digestion

Abstract

The search for alternative energy and fuels has motivated researchers to focus on renewable and sustainable means of getting them instead of relying on the conventional way of energy and fuel production. Anaerobic digestion is a biochemical process during which complex organic matter is decomposed in absence of oxygen, by various types of anaerobic microorganisms. The process of Anaerobic digestion is appropriate for all waste water treatment systems given that the solid can be introduced to the system at an acceptable concentration. Biogas, the product of anaerobic digestion process is a clean and renewable form of energy which can be a substitute for conventional sources of energy which are causing ecological-environmental problems and at the same time depleting at a faster rate. This paper reviews the anaerobic digestion process and its complexities; it covers different stages involved in the process, the substrate used in the process, the relationship between the substrate and microorganisms and important operating parameters such as pH, temperature and loading rate.

Removal of Biological Organic Matter and Suspended Solid from Textile Wastewater Using Anaerobic-Aerobic Process: A Review of an Industrial Implementation

“…HRT is considered as one of the important factor for anaerobic digestion. It is acknowledged that higher efficiency can be achievable at higher HRT [15]. Similar result found by different researchers of this world.…”

Effects non-digested and anaerobically digested farmyard manures on wheat crop cultivated in desert soil

“…digestion is a process by which anaerobic microorganisms break down biodegradable material in the absence of oxygen mainly through four stages, i.e., hydrolysis, acidogenesis, acetogenesis, and methanogenesis (Adekunle and Okolie, 2015;Angelidaki et al, 2011). In the first stage carbohydrates, fats and proteins in the manure are hydrolyzed by extracellular enzymes to monomeric simple sugars, fatty acids, and amino acids.…”

Advanced technologies for the treatment of wastewaters from agro-processing industries and cogeneration of by-products: a case of slaughterhouse, dairy and beverage industries

“…This is the first stage in anaerobic digestion process, involves the enzyme-mediated transformation of insoluble organic materials and higher molecular such as carbohydrates, lipids, and proteins into soluble organic materials, i.e., to compound of suitable use as source of energy for microorganisms (Adekunle and Okolie 2015). These organic compounds are degraded into simpler products in the presence of hydrolytic bacteria as follows (Leung and Wang 2016 …”

“…Within these various fermentation reactions, the monomers produced in the hydrolytic phase are taken up by various acid forming bacteria (acidogens). In general, acidogens are relatively fast growing microorganism (Adekunle and Okolie 2015). The only chemically relevant functional group of VFAs, the carboxylic group makes these compounds acidic in nature.…”