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

Introduction

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

The clean way to a sweet product

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.

The sugar industry in particular likes to use flume water circuits for the cleaning of processed crops. Abundant lime is added to the flume water prior to beet washing, which reduces the odours and results in a better settling of soil. In addition, the lime also reduces the corrosion in the pipes. However, this results in waste waters with high calcium content and a tendency for mineral precipitation. Conventional waste water treatment with UASB or EGSB reaches its limits here due to the extremely high calcium carbonate precipitates rapidly clogging up the appropriate equipment and thus reducing the degradation performance.

Process Technology ANAFIT®.CS

Flowsheet ANAFIT.CS
Flowsheet ANAFIT.CS

ANAFIT.CS is a reliable, time-tested and very effective method for the treatment of just such waste waters. It is based on the anaerobic contact sludge process and combines three consecutive steps into an effective unit:

In the methane reactor a distribution system of stainless steel lances evenly blows gas into the supplied mixture of mud and water. Without moving parts suffering from wear and tear the mixture is constantly agitated and kept liquid. Here both the calcium carbonate and the pollutant concentration are removed by precipitation and hence the COD is drastically reduced. At the same time, energy-rich biogas is produced in the methane reactor. This creates positive pressure through which about 90 percent of the gas is discharged in this step already.

In the subsequent closed degassing stage the mixture of water and sludge settles again. An agitator and a blower remove the remaining ten percent of the produced biogas, which is not only an important resource, but would also disrupt the operational processes in the third stage.

The thickener, as the final stage of purification, separates the liquid and solid components of the discharged mixture and feeds the thickened sludge back into the methane reactor as valuable biomass. There it goes through the process again in order to produce more biogas. Once enough sludge has been collected in the methane reactor, excess solids are removed at this point.

Downloads ANAFIT®.CS

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