Effect of biochar combined with a biotrickling filter on deodorization, nitrogen retention, and microbial community succession during chicken manure composting.

[Display omitted] • NH 3 , H 2 S, and TVOCs emission decreased by 20.04%, 16.18%, and 17.55% in the EG group. • The TN, NH 4 +-N, and NO 3 –-N contents were higher in the EG group. • Pusillimonas and Pseudomonas (N-cycling) became more active in the EG group. • Hydrogenispora (sulfur-cycling) decreased in the EG group. • NH 3 , H 2 S, and TVOCs removal rates reached 95%, 97%, and 53% in the BTF system. The high-nitrogen content and dense structure of poultry manure compost cause volatilization of N to ammonia (NH 3). This study evaluated the combined application of biochar and biotrickling filtration (BTF) to remove of odor in chicken manure mixed straw compost (w/w, 2.5:1). Adding of 10% biochar reduced NH 3 , hydrogen sulfide (H 2 S), and total volatile organic compounds (TVOCs) contents by 20.04%, 16.18%, and 17.55% respectively, and decreased the N loss rate by 8.27%, compared with those observed in control. The organic matter content decreased by 28.11% and germination index reached 97.36% in the experimental group. Meanwhile, the N-cycling microorganisms such as Pusillimonas and Pseudomonas became more active, and the relative abundance of sulfur-cycling microorganisms Hydrogenispora decreased in the experimental group. Following BTF application, the NH 3 , H 2 S, and TVOCs removal rates reached 95%, 97%, and 53%, respectively. [ABSTRACT FROM AUTHOR]