Anaerobic digestion is a series of processes in which microorganisms break down biodegradable material in the absence of oxygen. It is used in a variety of industrial and municipal applications to manage solid and liquid waste and/or to produce energy in the form of biogas.
Due to the nature of the process, anaerobic digestion requires very little energy input compared with other effluent treatment systems. If the biogas is utilized as an energy source, then an anaerobic system can also be a source of renewable energy.
Anaerobic reactors are particularly effective in treating readily biodegradable effluent streams. However, on its own an anaerobic reactor is not able to achieve the environmental discharge standards required by legislation. We recommend using an anaerobic system in combination with an activated sludge system (such as MBR or SBR) to achieve discharge standards. Alternatively, an aerobic system can be used to economically condition effluents prior to discharge to a municipal sewer, thereby saving on disposal charges and energy costs.
Anaerobic digesters can also be effectively used to reduce waste sludge volumes prior to dewatering or disposal. This can represent a significant cost saving, especially if the biogas generated can be harnessed as a source of energy.
A2V have a developed a cost effective UASB reactor in polyethylene for use in small to medium scale applications. The UASB is well proven technology and has found widespread application in the treatment of municipal and industrial effluents.
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