Innovative biogas plant concept in Can Tho, Vietnam (in co-operation with Bonn University, Germany)
Within the Sansed project, an innovative biogas plant concept is realized relying on a typical biomass mixture of the region. In addition to swine slurries, large resources of rice straw are also available for anaerobic digestion.
The central characteristic of the biogas plant Sansed is a separated hydrolysis stage for rice straw. The rice straw, before being digested in the main digestor together with swine slurry, is led into an upstream tank for five days retention time for hydrolysis together with fermentation runback. During this process, soluble organic components are converted into organic acids, leaving the raw fibre untouched.
In order to avoid handling problems concerning material weights and to simplify the hydrolysis flow management, the process is realized in two ration batches per day. The plant design contains a hydrolysis basin with a downstream digestor. The hydrolysis basin incorporates ten hydrolysis batch baskets. These baskets, steel-framed with acid resistant nets, incorporate the daily rice straw doses and remain in the basin for five days. A lifting block supports the daily charging and discharging operations, where each basket can be inclined over long-side fixed axles. Where as the raw fibres remain within the baskets, due to hydrolysis the organic components are dissolved and merge into the swine slurry runback filled basin. The basin is continuously flushed with a low component current of swine slurry runback, that already contains the appropriate bacteria stems and leads into the digestor. The remaining undigestible rice straw is discharged, dripped and used for composting. By separating raw fibres and soluble components of rice straw volume load and retention time of the downstrem digestor are optimized concerning process efficiency and size of digestor.
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Batch Test
Can Tho Vietnam
