| Abstrakt: |
This research was aimed to utilize of granule sludge from wastewater treatment process of Cassava starch factory for energy generating and use waste sludge in construction materials as the alternatives in waste management and zero waste concept. In addition, the compositions of sludge from the cassava factory were 22.43% organic content, 18.3% fixed carbon and high heating values. For this reason, sludge from cassava starch factory were high feasible in various forms of energy benefits. The results of the study about determining gas generated from granule sludge under anaerobic conditions by fluid displacement method. Granule sludge produced gases for 9 days which found maximum volume on the first day and total gas production are 649.97 ml (average of 72.2 ml/d or 3.25 ml/g-oven dry weight). The composition of gases found methane concentration between 729,404 to 9,900,837 ppm. The results indicate that sludge age and organic matter content in sludge were important factors affecting to the quantity and quality of biogas. After gas extraction process, waste sludge was used to make compacted charcoal by mixing with charcoal from plants. The results indicated that the proportion of sludge should not more than 40% for mixing with charcoal for maintain released heat equivalent to biomass-compacted charcoal standard because the mixed sludge played role in supporting the steady-carbon form as well as increasing burning period for more heat releasing. For maximum benefits, ash as obtained from compacted-charcoal could be possibly subjected to compensate the cement for making construction materials. The employment of block was very necessary to construct the brick materials with mixed ash less than 20% for weight supporting. Finally, it should not take any parts of block existing with mixed ash to soak in longer period for releasing some heavy metals in wastewater one way or another. [ABSTRACT FROM AUTHOR] |
