| 摘要 |
The present disclosure relates to a process arrangement for controlling dry matter content of a process stream comprising a biological substrate. The arrangement comprises a mixing unit 1 configured for mixing dry and liquid matter of the process stream. The arrangement also comprises a separating unit 2, configured for being downstream of the mixing unit and for separating heavy phase particles from the process stream. The arrangement also comprises a concentrating unit 3, configured for being downstream of the separating unit and for removing process water from the process stream, thereby concentrating the dry matter of the biological substrate in said process stream. The arrangement also comprises a first recirculation loop 13a arranged for recirculating at least a part of the process water from the concentrating unit to the process stream upstream of the separating unit. The arrangement also comprises a second recirculation loop 14a arranged for recirculating at least a part of the process stream with concentrated dry matter from downstream of the concentrating unit to the process stream upstream of the separating unit. The arrangement also comprises a flow detector 41 for measuring in-line the dry matter content of the process stream between the mixing unit and the separating unit. The arrangement also comprises a controller 33 for controlling the recirculation in the first recirculation loop based on the measured in-line the dry matter content, and for controlling the recirculation in the second recirculation loop based on the measured in-line the dry matter content. |
