In the majority of the digesters that Aqualimpia has evaluated, sludge is chemically treated using flocculants and is never extracted based on the degree of mineralization of the sludges or their age. Fresh, undigested sludge is extracted, which still contains a lot of organic load and fats that make it difficult to separate and dry.
Digestate and sludge from biodigesters that treat POME can cause high operating costs if they are not extracted following technical recommendations. If the sudge is extracted without knowing his mineralization grade, it will contain high contents of organic compounds, they are sticky and greasy. Therefore they can not be separated from the liquid component and they are not properly dehydrated in sludge drying beds
Aqualimpia has developed a sludge extraction process that takes into account the degree of mineralization of the sludge and the content of dry mass and volatile solids of the sludge. These are removed and conducted through a solids separator. The separated sludge is dried in a cell of the sludge drying bed and the liquid component is recirculated to the biodigester or is also dried in special cells of the sludge drying bed.
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