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This paper focused on the results of an experiment involving sewage sludge drawn from a typical dairy processing plant after application of polyacrylamide (PAM) flocculant in an approximate dosage of 3.5 kg Mg -1 dry matter for dewatering and subsequently taken for aerobic fermentation in a lab-scale bioreactor with a capacity of 120 dm 3 within 31 days. Since it can not be ruled out that such sewage sludge will be used as a good soil fertilizer for edible plants, e.g. vegetables, the concentration of neurotoxic and carcinogenic residual acrylamide monomer (AMD) was monitored throughout the composting process. Analysis of AMD was conducted using the HPLC method for compost samples taken after the 1 st day of the experiment, on the 10 th day and on the last 31 st day of the experiment. The results obtained from the composting process with measurement of temperature and air flow intensity indicate that aerobic composting resulted in a significant reduction of the AMD content in the compost, up to 23% of the initial value. It appears to be the case that intensive processes of biochemical degradation during aerobic fermentation of sludge from the dairy processing plant significantly reduces the threat of residual monomers being released into the environment from a polyacrylamide applied as a chemical sludge conditioner.

CHANGES IN ACRYLAMIDE MONOMER CONTENT DURING COMPOSTING OF DAIRY PROCESSING SLUDGE