Effects of Turning Frequency on Ammonia Emission during the Composting of Chicken Manure and Soybean Straw

oleh: Qianqian Ma, Yanli Li, Jianming Xue, Dengmiao Cheng, Zhaojun Li

Format: Article
Diterbitkan: MDPI AG 2022-01-01

Deskripsi

Here, we investigated the impact of different turning frequency (TF) on dynamic changes of N fractions, NH<sub>3</sub> emission and bacterial/archaeal community during chicken manure composting. Compared to higher TF (i.e., turning every 1 or 3 days in CMS1 or CMS3 treatments, respectively), lower TF (i.e., turning every 5 or 7 days in CMS5 or CMS7 treatments, respectively) decreased NH<sub>3</sub> emission by 11.42–18.95%. Compared with CMS1, CMS3 and CMS7 treatments, the total nitrogen loss of CMS5 decreased by 38.03%, 17.06% and 24.76%, respectively. Ammonia oxidizing bacterial/archaeal (AOB/AOA) communities analysis revealed that the relative abundance of <i>Nitrosospira</i> and <i>Nitrososphaera</i> was higher in lower TF treatment during the thermophilic and cooling stages, which could contribute to the reduction of NH<sub>3</sub> emission. Thus, different TF had a great influence on NH<sub>3</sub> emission and microbial community during composting. It is practically feasible to increase the abundance of AOB/AOA through adjusting TF and reduce NH<sub>3</sub> emission the loss of nitrogen during chicken manure composting.