Practical Implementation

The process of biological treatment with biogas production is divided into several stages:

  1. Preliminary preparation: separation of larger mechanical impurities (≥ 1,75 mm) in a mechanical sieve.

  2. Averaging of effluent parameters in a buffer tank

  3. Separation of fats from wastewater, as they are inhibitors and suppress the decomposition process. This function is performed by an aerated flotator (DAF) incl. a pipe flocculator

  1. The liquid phase, after separating the fats, enters anaerobic reactor type ECSB - with built-in 2 phase separators, which retain the anaerobic biomass. The reactor itself is coupled on several levels to an NT neutralization tank where temperature and pH optimization is achieved.

  1. The separated fats and suspended solids are also treated anaerobically, but on an extended cycle (25 days) in a CSTR-type anaerobic reactor.

  2. The digested and mineralised CSTR effluent is dewatered in a centrifugal decanter, significantly reducing its volume, and the separated water is directed to the buffer tank of the pre-retreatment

  1. In case that a high level of treatment is required, depending on the parameters specified in the discharge permit, subsequent aerobic treatment is needed.

  2. The produced biogas from both the ECSB & CSTR reactors is collected in a gas holder.