摘要
活性污泥碱式热水解并经分离萃取获得的微生营养激励素,富含促进植物生长的含氮养分和激励素物质,在污泥资源化利用和农业可持续发展领域日益受到关注。重点解析微生营养激励素的基本养分特征、激励素成分特征和污染物含量特征,并分析其土地应用潜力。微生营养激励素含有丰富的促进植物生长的氮磷钾、有机碳和矿物等营养元素,以N和Ca元素为主。同时,微生营养激励素也含有激励素成分,如腐植酸、富里酸、色氨酸类物质、植物激素类物质(吲哚-3-乙酸)和化感物质(吲哚类衍生物),共计9445种有机分子被检出。微生营养激励素相比于污泥,重金属含量降低了47.39%~100%,且多环芳烃和抗生素的生态风险远远低于污泥。对其作物效应进行总结发现,微生营养激励素可以促进小白菜产量、减少小白菜中重金属的累积,可通过部分替代化肥降低施肥成本。通过解析微生营养激励素中养分和激励素成分的双重属性,提出微生营养激励素在提升小白菜光合作用、抗氧化性、营养品质和减少小白菜重金属累积方面具有良好的应用潜力。
Microbial nutrient stimulant,produced after alkaline thermal hydrolysis of activated sludge,are rich in nitrogenous nutrients and stimulant substances that promote plant growth,and have received rising attention in the field of sludge resource utilization and sustainable agricultural development.This study focused on analyzing the basic nutrient characteristics,stimulant composition characteristics,and pollutant content characteristics of microbial nutrient stimulants,and analyzing their potential in land application.Microbial nutrient stimulant was rich in nutrients such as nitrogen,phosphorus,potassium,organic carbon,and minerals that promoted plant growth,with nitrogen and calcium as the main elements.At the same time,the microbial nutrient stimulants also contained stimulant components such as humic acid,fulvic acid,tryptophan,as well as phytohormone substances(indole-3-acetic acid)and chemosensory substances(indole derivatives),a total of 9445 kinds of organic molecules were detected.The heavy metal content of microbial nutrient stimulants was reduced by 47.39%to 100% compared to sludge,and the ecological risk of PAHs and antibiotics was much lower than that of sludge.A summary of the land application effect showed that microbial nutrient stimulants could promote the yield of pakchoi cabbage,reduce the accumulation of heavy metals in pakchoi cabbage,and reduce fertilization costs,by partially replacing chemical fertilizers.By analyzing the dual properties of nutrient and stimulant components of microbial nutrient stimulant,it was suggested that microbial nutrient stimulant had good potential for application in enhancing photosynthesis,antioxidant properties,nutritional quality,and reducing heavy metal accumulation in pakchoi cabbage.
作者
郝家厚
谭嘉怡
张悦
宋联
王硕
陈思思
李激
HAO Jiahou;TAN Jiayi;ZHANG Yue;SONG Lian;WANG Shuo;CHEN Sisi;LI Ji(Jiangsu Key Laboratory of Anaerobic Biotechnology,School of Environment and Civil Engineering,Jiangnan University,Wuxi 214122,China;Water Industry Association,China Civil Engineering Society,Beijing 100082,China;Wuxi Guolian Environmental Protection Technology Co.,Ltd.,Wuxi 214000,China;Jiangsu College Water Treatment Technology and Material Collaborative Innovation Center,Suzhou 215009,China)
出处
《环境工程》
CAS
CSCD
北大核心
2023年第9期80-88,共9页
Environmental Engineering
关键词
微生营养激励素
污泥资源化
土地利用
化肥替代
作物品质改善
microbial nutrient stimulants
sludge resource utilization
land use
fertilizer substitution
crop quality improvement
