DYNAMICS OF POTASSIUM CONTENT IN SEWAGE SLUDGE DURING ITS COMPOSTING WITH DIFFERENT ADDITIVES

摘要

The aim of the experiment was to determine changes in the potassium content of sewage sludges during their composting with the addition of: lime in the amount equivalent to 1 Hh, 20 and 40% of coniferous tree sawdust, 20 and 40% of rye straw, and 20 and 40% of cattle manure. The content of total potassium and potassium soluble in 0.5 M HC1 of the initial material depended mainly on the amount and type of additives used for composting. During composting, a steady increase in total potassium was observed in all objects. The composting process contributed to an increase in soluble potassium content from 2-fold (with the addition of 20% of sawdust) to 20-fold (with 40% of straw) in all experimental objects.