ANAFIT.AC - Expanded granular sludge bed digestion (EGSB) from H+E


ANAFIT®.AC - Expanded granular sludge bed digestion (EGSB) von H+E

Turning Your Wastewater into a Source of Energy

The manufacturing processes in the food industry often provide stringent process technology and engineering requirements for the necessary wastewater treatment plants. In many cases the only possible solutions are individually developed and use specifically matched processes.

Wastewater treatment processes will necessarily vary depending on the industry-specific composition and the degree of contamination of wastewaters. For wastewaters with mainly organic contents, an anaerobic wastewater treatment is often the best solution, since in addition to the cleaning performance the simultaneous energetic benefit is very high here. In a well-managed wastewater treatment plant with careful process control such as that offered by ANAFIT®.AC, the wastewater constituents are converted back into energy. In certain sectors of the food and beverage industry (such as fruit juice production, starch production, breweries, malting plants), but also in the paper industry, as much as 90 percent of waste water constituents can be anaerobically degraded and converted into valuable biogas. In this process, the organic substances are reduced by anaerobic bacteria to methane gas in an oxygen-free environment. The central component of the ANAFIT®.AC method used by us is a two-stage high performance EGSB class reactor.

Function of the EGSB Reactor


EGSB” stands for “Expanded Granular Sludge Bed”. The ANAFIT®.AC reactor works as an anaerobic reactor with a high content of granules. Its performance makes it particularly ideal for larger amounts of wastewater with high COD loads.

The EGSB methane gas reactor used by H+E operates in two stages. The two buffer stages create a controlled flow throughout the reactor area that is supported by an external recirculation. To set the desired reaction in motion, methane bacteria in the form of pellets are used in the reactor.

The wastewater is evenly distributed over the bottom of the reactor through an inlet system and then flows through a bed of granular anaerobic biomass. The pellets, with a diameter of two to four millimeters, subsequently develop by themselves. The anaerobic bacteria in the pellets convert the dissolved carbon in the wastewater into biogas, and the reactor quickly reaches its full capacity. The multistage reactor design is specifically adapted to a high content of pellets. This allows for stable removal performance even at peak times. Unpleasant odour emissions are prevented by a closed construction.

The high efficiency of the entire process technology results in an abundant discharge of valuable biogas that can be used for energy. In addition, consistently only a small amount of excess sludge accrues – mostly in the form of pellets, which can be sold.

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