[Biodegradation of tri- and perchloroethylene in sewage waters and soils by a microbial consortium of compost and phototrophic bacteria].

Compost and phototrophic bacteria are found to be able to degrade trichloroethylene (TCE) and perchloroethylene (PCE). With a TCE dose increase by more than 10 mg/kg, the TCE degradation decreases due to the toxic effect of this pollutant on microbial consortium activity. The addition of compost combined with a liquid culture of phototrophic bacteria (PTB) is experimentally proved to effectively decrease the TCE content in soil and water.

[Impact of sewage sludge composting conditions on colibacillus growth].

An exothermic reaction that takes place during organic residue composting causes the death of pathogenic microorganisms, protozoa, and helminth eggs. However, the bacteria of the colibacillus group can preserve vital activities under such conditions. Sewage sludge fermentation gives off not only heat, but also moisture that, by lowering the temperature of composted mass, serves as a factor contributing the propagation of these microorganisms. Close observance of composting technology prevents the development of colibacilli.

[Effect of photosynthetic bacteria and compost on degradation of petroleum products in soil]. / Vliianie fotosinteziruiushchikh bakterii i komposta na degradatsiiu nefteproduktov v pochve.

Addition of diesel fuel and waste engine oil to soil was found to cause biostimulation of hydrocarbon-oxidizing microorganisms. Corynebacteria constitute a large group of hydrocarbon-oxidizing microorganisms. Addition of a liquid culture of photosynthetic bacteria to soil not only facilitates degradation of petroleum products, but also stimulates growth of hydrocarbon-oxidizing microorganisms. Combined addition of photosynthetic bacteria and compost to soil polluted with petroleum products causes even a more significant increase in the count of hydrocarbon-oxidizing bacteria and substantially increases the rate of pollutant degradation.