ABR Biogas plant
The Anaerobic Baffle Reactor (ABR) process turns solid waste (sludge) from land based fish farms into biogas fuel. Depending on the size of operation, several hundred m3 biogas energy can be produced daily. This energy can be used to heat up incoming water to the farm.
The biogas plant treats all solid waste generated at the fishfarm. The fish waste is a mixture of feces and surplus feed. This is the only substrate for the anaerobic process producing biogas, which consists of 65% of methane and 35% of carbon dioxide. The suspended solid waste is separated from water in the fish tanks by drum filters. The resulting “sludge” is pumped to a receiving tank and from here to a gravity separator/thickener. The thickener is a special conical lamella separator. The thickened sludge is stored and batch-pumped into a dissolver, which disintegrates any feed particles. This increases the total surface area of the sludge to make possible very efficient anaerobic degradation and conversion to biogas.
The biological part of the process consists of a hydrolysis reactor where large molecules are broken down to smaller ones (mainly organic acids). The treated sludge is pumped into the heart in the system, the ABR reactor. The reactor consists of four chambers in series where the biogas is formed. The energy part of the biogas is methane – abt. 65% of the total gas composition.