Abstract
Purpose: Performance of slurry composting and biofiltration with methane production (SCB-M) using swine manure and sawdust was evaluated. The suitable specific liquid input (SLI) was determined at lab-scale SCB. Method: In lab-scale SCB, the SLI test was performed at liquid input rate of 0.04, 0.09, <TEX>$0.17cc/cm^3$</TEX> with constant sawdust volume. In pilot-scale SCB-M, the swine manure was fed to methane digester at organic loading rate (OLR) of 0.25-0.5 g VS/L/d. The effluent from methane digester was filtered using SCB. Results: The SLI at <TEX>$0.04cc/cm^3$</TEX> showed good performance in terms of retention time. In pilot-scale SCB, the removal of <TEX>$NH_3$</TEX>-N and total nitrogen (T-N) was found to be around 59% and 28%, respectively. Similarly, volatile fatty acid (VFA) and total chemical oxygen demand (TCOD) removal was found be 56% and 43%, respectively. Conclusions: For SCB-M process, the SLI of <TEX>$0.04cc/cm^3$</TEX> is recommended. The performance of swine manure treatment was improved more by using SCB-M system than using methane digester only.
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