Comparison of drying between organic sludge and inorganic sludge after dewatering / About effects of flocculants during drying -2
There are mainly two types of sludge after water treatment and dewatering, and they are organic sludge and inorganic sludge.
Both organic and inorganic sludge are sticky and adhesive before drying, and there is not so much difference between them. However, there are differences in their state after drying. Both organic and inorganic sludges becomes granular or dumpling shape after drying. This is probably the effect of flocculants added during water treatment and dewatering processes. In both cases, surface is dried under the shape of dumpling-like after drying. However, inside of inorganic sludge is dried well and inside of organic sludge is still wet when they are smashed with fingers. Also, organic sludge becomes small granular as moisture contents becomes low, however, inorganic sludge becomes powdery and dust is generated.
Organic sludge becomes granular and not powdery even it is dried to moisture content of 10% or less, so that there is no need for dust collectors, and also problems hardly occur during transportation and conveyance.
Inorganic sludge, on the other hand, becomes powdery easily after drying and problems in dust collecting, transportation and conveyance need to be considered when it is dried to low moisture contents. Therefore, we recommend the moisture contents of inorganic sludge after drying to be around 30-40% W.B..
Movie of drying inorganic sludge
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