Archives of Environmental Protection

Abstract

The article discusses the possibility of recycling the biomass ashes in a sewage sludge management. In laboratory tests, ashes from straw and beech wood combustion were used. The effectiveness of sludge conditioning was investigated by the capillary suction time (CST) measurement. The infl uence of straw and beech wood ashes on sewage sludge dewatering was examined by means of vacuum fi ltration for the vacuum pressure of 0.01 and 0.02 MPa. The laboratory tests showed that sewage sludge after conditioning with the use of biomass ash indicated a much stronger dewatering capacity than raw sewage sludge. The results proved the different infl uence of biomass ashes on the effectiveness of sludge dewatering. The best results were achieved for beech wood ash for the highest dosage of material (30 kg•m -3 ). However, further detailed tests are needed in order to defi ne the optimal dose of biomass ash.