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This paper presents principle technology to produce suspension fertilizer based on wastewater treatment plant excess sludge and alkaline oil shale ash from a thermal power station.
For that the treatment in a mechanical disintegrator and contact with biogas from the anaerobic process of wastewater excess sludge is used. The ash is responsible for hygienisation or diminishing of intestine micro-flora in mixture. To get a suspension fertilizer and ensure total dehelminting sludge-ash mixture held together in a time and after that must be mechanically co disintegrated with mineral fertilizers. The latter is responsible for increasing nutritional value of the suspension. Dehelminting is achieved via the mechanical friction of helminthes eggs and damaging these by collisions with high velocity broken pieces of non-soluted mineral solids. Contact with biogas reduces high pH level of suspensions. At the same time it is a reasonable method for the upgrading of biogas.
Keywords
Excess sludge; ash; disintegration; suspension fertilizer; biogas upgrading.
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