摘要
以粉绿狐尾藻(Myriophyllum aquaticum)为原料,制备水热炭和热解炭,对比不同工艺和温度对生物炭基本性质的影响,并探究不同炭的养分释放特征及吸附性能差异.结果表明,水热炭产率(31%~40%)和灰分含量(7.24%~10.64%)低于热解炭(产率:38%~60%,灰分:16.55%~25.37%),前者在生产中矿物大量损失且低能耗下高位发热值(HHV)提升更显著.水热炭呈酸性,且养分容易释放,可用于碱性土壤改良.热解炭含有丰富的养分元素,其中,300℃的热解炭的氮、磷、钾元素释放量较高,而≥500℃热解炭的H/C<1,可溶性有机碳释放量<0.35 mg·g^(-1),有利于碳封存.此外,高温热解炭更易吸附磷酸盐,500℃热解炭具有最高的理论最大吸附量(6.25±2.54) mg·g^(-1).虽然水热炭和热解炭对铵态氮均表现出正向吸附,但两种工艺的生物炭对铵态氮的吸附强度较低.因此,不同工艺和温度下粉绿狐尾藻生物炭的应用潜力存在差异,以180℃制备水热炭的能耗低、产能潜力高,300℃制备低温热解炭磷钾储量和释放量高,500℃缓慢热解工艺适宜碳封存和磷吸附.
The basic properties of hydrochar and pyrolysis char produced from Myriophyllum aquaticum were compared under different processing technology.Meanwhile,the nutrient release and adsorption characteristics of different carbons were studied.The results showed that the ash content of hydrochar(7.24%~10.64%)was lower than that of pyrolytic carbon(16.55%~25.37%).The former has a great loss of mineral in production,and its higher heating value(HHV)increased more obviously under low energy consumption.The hydrochar could be used for alkaline soil improvement due to acidic characteristics and the higher nutrients release.The pyrolysis char contained abundant nutrient elements,while the release of nitrogen,phosphorus and potassium under 300℃was higher than that under 500℃and 700℃.However,the pyrolysis char under 500℃and 700℃were favorable for carbon sequestration because the element ratio of H and C(H/C)was less than 1 and the release amount of dissolved organic carbon was less than 0.35 mg·g^(-1).In addition,the highest theoretical phosphate adsorption capacity(6.25±2.54)mg·g^(-1) was observed in 500℃pyrolysis char.Both the hydrochar and the pyrolysis char exhibited positive adsorption of ammonium nitrogen,but the Freundlich isothermal adsorption model showed that the ammonium adsorption capacity of hydrochar and pyrolysis char were both low.Therefore,the Myriophyllum aquaticum hydrochar under 180℃had a high potential energy for low energy consumption,while 300℃for low-temperature pyrolysis char had a high phosphorus and potassium reserves and release,500℃slow pyrolysis process was suitable for carbon sequestration and adsorption of phosphorus.
作者
黄美玉
汪涛
黄琦舜
徐光志
HUANG Meiyu;WANG Tao;HUANG Qishun;XU Guangzhi(Institute of Mountain Hazards and Environment,Chinese Academy of Sciences,Chengdu 610041;University of Chinese Academy of Sciences,Beijing 100049;Hubei Provincial Academy of Eco-Environmental Sciences,Wuhan 430072)
出处
《环境科学学报》
CAS
CSCD
北大核心
2024年第3期237-246,共10页
Acta Scientiae Circumstantiae
基金
国家重点基础研发计划(No.2022YFD1901401)
四川省生态环境厅三项重点科研课题项目(No.N5100012022002898)。
关键词
粉绿狐尾藻
水热炭
热解炭
养分释放
养分吸附
Myriophyllum aquaticum
hydrochar
pyrolysis char
nutrient release
nutrient adsorption
