A new mechanical device for the pretreatment of animal waste was developed to separate pig waste into solid and liquid fractions using an endless belt made of filter material and continuously cleaned by air flow. The performance of the microscreening unit was evaluated over 3 months. Its efficiency in terms of solids removal increased with the content of solids in the influent slurry. For pig waste with DM of 3-8% efficiency was 47-59%. The DM of the screened solids varied between 14 and 18%, and had reasonable stacking properties. 39% of organic carbon, 32-35% Total Kjeldahl Nitrogen and 17.8-20.9% of total P were removed from the influent slurry in the microscreening process.
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