A Comparative Study of Swine Tissue Composting With Woodchips, Rice Husk And Wheat Straw

This study evaluated the performance of woodchips (WS), rice husk (RH) and wheat straw (ST) in swine tissue composting. The ST treatment was shown to first reach the highest temperature (55℃) at 12 d of composting and lasted 9 days. The total nitrogen content (TN) was higher and nitrogen loss was lower in ST than in WS or RH treatment. Ammonium nitrogen content(AN) analysis demonstrated lower NH 3 emission in ST than in WS or RH treatment. Bacterial community analysis indicated that bacterial diversity was higher in ST than in WS or RH treatment. The most dominant genera in all composting treatments were Pseudomonas , Streptomyces , Brevibacterium , Saccharoporyspora , Acinetobacter , Sphingobacterium , Devosia , Rhizobium , Microbacterium and Sanguibacter. The dominant bacteria were Pseudomonas, Staphylococcus and Sphingobacterium in ST treatment, Streptomyces , Acinetobacter and Sphingopyxis in WS treatment, and Sanguibacter, Pedobacter and Gordonia in RH treatment. Spearman correlation analysis revealed positive relationship of Brevibacterium , Devosia , Sanguibacter , Brachybacterium and Promicromonospora to temperature; Brevibacterium and Staphylococcus to TN; Brevibacterium , Devosia , Microbacterium , Sanguibacter , Brachybacterium and Promicromonospora to AN. This research provides useful information for improving the efficiency of swine tissue composting.