Institute of Environment, Resource, Soil and Fertilizer, Zhejiang Academy of Agricultural Sciences, 198 Shiqiao Road, Hangzhou 310021, China; Engineering Research Center of Biochar of Zhejiang Province, Hangzhou 310021, China.
College of Environment, Zhejiang University of Technology, Hangzhou 310014, China.
Bioresour Technol. 2017 Jul;235:332-337. doi: 10.1016/j.biortech.2017.03.103. Epub 2017 Mar 21.
Conversion of rice straw (RS) and pig manure (PM) into chars is a promising disposal/recycling option. Herein, pyrolysis and hydrothermal carbonization were used to produce bio- and hydrochars from RS and PM, affording lower biochar (300-700°C) and hydrochar (180-300°C) yields at higher temperatures within the specified range. The C contents and C/N ratios of RS chars were higher than those of PM ones, with the opposite trend observed for yield and ash content. C and ash contents increased with increasing temperature, whereas H/C, O/C, and (O+N)/C ratios decreased. The lower H/C ratio of biochars compared to that of hydrochars indicated greater stability of the former. KCl was the main inorganic fraction in RS biochars, whereas quartz was dominant in PM biochars, and albite in PM hydrochars. Thus, RS is more suitable for carbon sequestration, while PM is more suitable for use as a soil amendment substrate.
将稻草（RS）和猪粪（PM）转化为炭是一种很有前途的处理/回收选择。在此，通过热解和水热碳化作用，从 RS 和 PM 中制备生物炭和水炭，在规定范围内，较高温度下的生物炭（300-700°C）和水炭（180-300°C）产率较低。RS 炭的 C 含量和 C/N 比高于 PM 炭，而产率和灰分含量则相反。C 和灰分含量随温度升高而增加，而 H/C、O/C 和（O+N）/C 比值则降低。与水炭相比，生物炭的 H/C 比值较低，表明前者的稳定性更高。RS 生物炭中的主要无机成分是 KCl，而 PM 生物炭中主要是石英，PM 水炭中主要是钠长石。因此，RS 更适合用于碳封存，而 PM 更适合用作土壤改良基质。
