Borysova K. Colloid-chemical principles of bioaggregation of soil colloids

The thesis is devoted to the study of the colloid-chemical principles and mechanisms of soil colloids’ aggregation, their interaction with microorganisms and the developing the scientific basis of biocolloid process for improvement/renovation of soil structure (native and broken after metals’ bioleaching). It was shown that the complex of biocolloids of activated sludge (AS) biocenosis is much more effective for soil dispersion destabilization than colloids of montmorillonite, bacterial cells and turf. The comparison of electrical and hydrophobic properties of colloids of bacterial cells, AS, soils of three types has revealed the minimum ionic electrostatic barrier occurred in the colloidal system soil colloids-AS. The bioaggregates formed have the AS biocolloids’ associates as a base element. It is established that AS growth on glucose (acidogenous metabolism) or acetate/polypeptides (alkaligenous metabolism) results in the synthesis of extrapolymers-flocculants and biocolloids. The stronger aggregates (sediments), non-peptized in water are formed under alkaligenous vector of metabolism.New biocolloid process of soil structure forming based on microorganisms’ introduction and their metabolism specific regulation in soil system is worked out.