ANUBIX™ – T Expanded Granular Sludge Bed (EGSB) System

ANUBIX™ – T is an ultra-high loading-rate system utilizing expanded granular sludge bed (EGSB) technology. It is suited for high-strength wastewaters with COD (Chemical Oxygen Demand) values of up to around 25,000 mg/l, with low suspended solids (TSS) and fat, oil and grease (FOG) content.

Anaerobic digestion of organic matter takes place in the ANUBIX™ – T anaerobic reactor. Organic compounds (such as sugars) are primarily degraded by anaerobic bacteria (activated anaerobic sludge) and converted into biogas (a mixture of methane and carbon dioxide). Only a small amount of sludge growth takes place at this stage.

EGSB anaerobic reactor for pulp and paper factory
The ANUBIX™ – T  as a part of the wastewater treatment plant at PAPELERA NACIONAL S.A.

Advantages of the ANUBIX™ – T (EGSB) system:

  • Works with granular sludge and achieves high industrial wastewater treatment efficiencies;
  • Superior treatment with low effluent soluble COD/BOD concentrations requires smaller aerobic polishing stage;
  • Solid, corrosion resistant construction that is easily accessible for inspection;
  • Operating interruptions are minimized due to lack of moving parts inside of the reactor;
  • Additional gas holder is not required;
  • For your convenience and optimal land development we offer steel or concrete construction, rectangular or round configurations;
  • Fast startup of the system;
  • Very small footprint of the installation.

Industries and applications: as an anaerobic treatment of the various industry wastewater streams, including breweries, soft drinks & other beverages production, paper mills, starch production, and many more.

How does ANUBIX™ – T work?

In a typical plant, wastewater is first screened and then collected in a buffer tank equipped with an agitator. This tank is designed to allow sufficient qualitative and quantitative equalization and to acidify the wastewater partially. This allows for a more stable operation and better sludge quality in the next stage: the ANUBIX™ – B anaerobic reactor. Provisions will be made for pre-settling of solids, heating, cooling, CO2 degasification and inline neutralization if required as part of the overall process.

The two-phase lower separator diverts the biogas produced in the bottom area of the reactor to specific locations, where the curtains of rising biogas and water (called “gas-lift”) are formed. This creates a vertical mixing pattern in the tower reactor. After passing through the second layer of anaerobic sludge (the so-called “sludge blanket”) the wastewater passes through the internal three-phase separator device at the top of the reactor.

The modular separator units are built in stainless steel and GRP (Glass Reinforced Plastic) and are equipped with an additional cross-flow type parallel plate separator that ensures retention of even the smallest flocs of methanogenic sludge.

The clarified effluent leaves the reactor through a central collecting pipe. Biogas is collected at the top and conveyed for either further upgrading via scrubbing and drying, after which it can be fed to a utilization system such as an engine genset or boiler. Excess biogas is sent to an emergency flare.

At the project design phase, additional provisions can be foreseen for pre-settling of solids, heating, cooling, CO2 degasification, and inline neutralization, if required. The ANUBIX™ – T reactor is capable of handling very high loading rates of up to 25 kg COD/m³.d, depending on the type of wastewater.

Would you like to receive more information about ANUBIX™ – T? Contact us today!