EN
The results of laboratory and field investigations concerning the influence of biocatalytic additions on anaerobic digestion of wastewater in septic tanks are presented.Commercially prepared bacterial cultures (Bio-7, Digest) and mixtures of bacterial cultures with enzymes (Bioenzyclar, Enzybac) were applied.It was concluded that biocatlytic additions to septic tanks influenced the secondary chemical and bacteriological pollution of the mixed loquor over the primary sludge.The particular commercial biocatalysts did not improve the odour of wastewater.The effluent from septic tanks with biocatalytic additions did not meet the standards for wastewater to be drained off the soil or to natural waters.