Beijing Key Laboratory of Farmland Soil Pollution Prevention and Remediation, College of Resources and Environmental Science, China Agricultural University, Beijing 100193, China.
College of Resources and Environmental Sciences, Qingdao Agricultural University, Qingdao 266109, China.
Sci Total Environ. 2022 Nov 10;846:157487. doi: 10.1016/j.scitotenv.2022.157487. Epub 2022 Jul 20.
This study investigated the effects of dicyandiamide, phosphogypsum and superphosphate on greenhouse gas emissions and compost maturity during pig manure composting. The results indicated that the addition of dicyandiamide and phosphorus additives had no negative effect on organic matter degradation, and could improve the compost maturity. Adding dicyandiamide alone reduced the emissions of ammonia (NH), methane (CH) and nitrous oxide (NO) by 9.37 %, 9.60 % and 31.79 %, respectively, which was attributed that dicyandiamide effectively inhibited nitrification to reduce the formation of NO. Dicyandiamide combined with phosphogypsum or superphosphate could enhance mitigation of the total greenhouse gas (29.55 %-37.46 %) and NH emission (18.28 %-21.48 %), which was mainly due to lower pH value and phosphoric acid composition. The combination of dicyandiamide and phosphogypsum exhibited the most pronounced emission reduction effect, simultaneously decreasing the NH, CH and NO emissions by 18.28 %, 38.58 % and 36.14 %, respectively. The temperature and C/N content of the compost were significantly positively correlated with greenhouse gas emissions.
本研究探讨了双氰胺、磷石膏和过磷酸钙对猪粪堆肥过程中温室气体排放和堆肥成熟度的影响。结果表明，添加双氰胺和磷添加剂对有机质降解没有负面影响，反而可以提高堆肥的成熟度。单独添加双氰胺可分别减少氨（NH）、甲烷（CH）和氧化亚氮（NO）的排放 9.37%、9.60%和 31.79%，这是由于双氰胺有效地抑制了硝化作用，从而减少了 NO 的形成。双氰胺与磷石膏或过磷酸钙联合使用可以增强对总温室气体（29.55%-37.46%）和 NH 排放（18.28%-21.48%）的缓解作用，这主要是由于较低的 pH 值和磷酸成分。双氰胺和磷石膏的组合表现出最显著的减排效果，同时分别减少 NH、CH 和 NO 的排放 18.28%、38.58%和 36.14%。堆肥的温度和 C/N 含量与温室气体排放呈显著正相关。
