Xiao Ran, Wang Jim J, Gaston Lewis A, Zhou Baoyue, Park Jong-Hwan, Li Ronghua, Dodla Syam K, Zhang Zengqiang
College of Natural Resources and Environment, Northwest A&F University, Yangling, Shaanxi 712100, China; School of Plant, Environment & Soil Sciences, Louisiana State University Agricultural Center, Baton Rouge, LA 70803, USA.
School of Plant, Environment & Soil Sciences, Louisiana State University Agricultural Center, Baton Rouge, LA 70803, USA.
Waste Manag. 2018 Aug;78:802-810. doi: 10.1016/j.wasman.2018.06.047. Epub 2018 Jul 4.
In this study, nutrient properties and carbon sequestration potential of biochars derived from chicken manure (CM) impregnated with mineral salts (calcium chloride, magnesium chloride, ferric chloride) were evaluated. Pretreatment with mineral salts reduced phosphorus (P) availability via the formation of insoluble metal phosphate minerals. Less carbon was lost during the pyrolysis of pretreated CM, and the produced biochars (BC, BC, and BC) were more stable (i.e., reduced C loss during chemical oxidation and less CO release during incubation) than pristine biochars. Spectroscopic evidence indicated that enhanced biochar stability via metal salt pretreatment before pyrolysis was related to increased aromatization and enhanced physical protection due to the metal-oxygen interaction, together with the formation of metal mineral phases on biochar surfaces. Moreover, ferric chloride was the optimal additive, as it significantly decreased biochar P leachability and increased carbon sequestration potential.
在本研究中，对浸渍有矿物盐（氯化钙、氯化镁、氯化铁）的鸡粪（CM）衍生生物炭的养分特性和碳固存潜力进行了评估。用矿物盐进行预处理通过形成不溶性金属磷酸盐矿物降低了磷（P）的有效性。预处理后的CM在热解过程中碳损失较少，并且所产生的生物炭（BC、BC和BC）比原始生物炭更稳定（即化学氧化过程中碳损失减少，培养过程中CO释放量减少）。光谱证据表明，热解前通过金属盐预处理提高生物炭稳定性与芳构化增加以及由于金属 - 氧相互作用导致的物理保护增强有关，同时生物炭表面形成了金属矿物相。此外，氯化铁是最佳添加剂，因为它显著降低了生物炭的P浸出性并提高了碳固存潜力。
