The paper contains an assessment of the effectiveness of polyaluminium chloride (PAX-18) application in improving sedimentation properties of activated sludge at the wastewater treatment plant in Olsztyn. The causes of bulking and foaming of activated sludge have been identified. The effect of adding doses of polyaluminium chloride on the sludge volume index (SVI) and counts of Microthrix parvicella has been analysed. Application of doses of PAX-18 within the range of 0.63 and 2.13 g Al⁺³ kg⁻¹ sdmd (sludge dry mass daily) to the system, for the duration of 10 to 89 days, proved to be an ineffective way of reducing SVI. However, in most cases, the applied treatments reduced the foaming of activated sludge in multi-functional reactors.
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