The new ADbag has been presented by Biogas Engineering - Demtra. The system is composed of a plasticised fabric bag which will work as reaction tank and a technical container will provide for the recirculation and heat control of the sludge, and will also host the control panel in the case where biogas will be used for the production of electricity, a CHP, the company says. The sludge within the reaction tank will be agitated by a recirculating system which will suck the slurry from the bottom and will re-inject it through four nozzles placed at the equator of the bag tank and from a single rotating sprinkler placed at the top. The whole process is monitored and managed remotely. The onsite operators take care of basic operations, while their engineers access the control panel via internet and supervise the process, says Demetra. The installation of the standard system requires an area 50x30 mt wide. The bag tank needs a “cradle” which will be partially excavated in the soil. The resulting soil from the excavation will be used to build the shoulders. The bag is positioned at the centre of the cradle, unpacked and connected to the pipes to complete the circuits. As for the storage pits for the handling of the digestate, the feeding tank and the screed for the container, the company says they will be assembled on site from pre-casted concrete elements.