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Waste Water Treatment Plant (WWTP) of paper mills generates biological sludge containing organic compounds such as microbial biomass in the range of 60-90%. The sludge is voluminous and difficult dewatered causing problems during handling and utilization. Microbial cell wall disintegration using thermo-alkaline and sonication disrupt microbial cell walls so sludge handling and utilization is easier for further use. Cell wall disruption of biological sludge pre-treatment using thermo-alkaline, sonication and combination of both treatments has been conducted. Thermo-alkaline treatment was carried out for 24 hours with temperature variations (20 o C, 37 o C, 50 o C) and pH (9, 10, 11); sonication treatment was performed at high frequency (30 ± 10 kHz) with a variation of time (15, 30, and 45 minutes), and the combination of both treatments was performed at the optimum conditions respectively. The effectiveness of treatment was evaluated based on the increase of soluble COD (COD f ) and ratio of COD f /COD T with univariate statistical test (SPSS 16.0). The results showed that the thermo-alkaline treatment is more effective than sonication and combination treatment. The best condition was obtained when sludge treated with thermo-alkaline treatment at pH 10 and temperature 37°C, COD f was increased 439.91%, with ratio of COD f /COD T 0,128.

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DISINTEGRASI DINDING SEL MIKROBA LUMPUR BIOLOGI INSTALASI PENGOLAHAN AIR LIMBAH INDUSTRI KERTAS SECARA TERMO-ALKALI DAN SONIKASI (&lt;i&gt;Microbial Cell Wall Disintegration of Biological Sludge from Paper Industry Wastewater Treatment Plant using Thermo - Alkaline and Sonication&lt;i&gt;)