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Organic sapropel is a high-quality source of soil humus replenishment and is highly effective when applied to degraded and technogenically contaminated soils. The specific conditions of sapropel deposit formation result in a dispersed structure containing 92-98% water. To utilize sapropel as a solid organic fertilizer, its moisture content must be reduced to 60%, which requires significant energy input. One approach to utilizing organic sapropel in its natural moisture state is treating it with a weak alkaline (or acidic) solution to produce humic fertilizers. To ensure a high-quality reaction between sapropel and alkaline solution, a laboratory-scale rotary disperser-mixer was developed. This design facilitates micro-mixing of naturally moist sapropel with an alkaline solution in an annular channel formed between the rotor and stator. The aim of this study is to determine how the parameters of sapropel treatment in the developed disperser-mixer influence the activation of the humic complex. The study investigated the effects of the alkali solution concentration, the sapropel-to-alkali solution ratio, and the disperser-mixer rotor speed on the treatment process. To assess the effectiveness of the treated sapropel, a laboratory experiment was conducted, growing oil radish with varying fertilizer applications. A four-factor Box-Behnken experimental design was used to develop a mathematical model describing the effect of the treated sapropel on oil radish growth. The results indicate that sapropel processed using the developed rotary disperser mixer, compared to untreated sapropel, led to a 5-20% increase in oil radish plant height.

Кафедра електроніки та телекомунікації

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