氨三乙酸对好氧堆肥过程中氮素保存效果的影响  

Effect of nitrilotriacetic acid on nitrogen conservation during aerobic composting

作　　者：程丰 何青山 宋明淦 李秀芬[1,2,3,4] 程宇晖 任月萍 CHENG Feng;HE Qingshan;SONG Minggan;LI Xiufen;CHENG Yuhui;REN Yueping(School of Environmental and Civil Engineering,Jiangnan University,Wuxi 214122,China;Jiangsu Key Laboratory of Anaerobic Biotechnology,Wuxi 214122,China;Jiangsu Collaborative Innovation Center of Water Treatment Technology and Material,Suzhou 215009,China;Jiangsu Engineering Laboratory for Biomass Energy and Carbon Reduction Technology,Wuxi 214122,China;Wuxi HOPE Bio-Environmental Protection Technology Co.Ltd.,Wuxi 214125,China)

机构地区：[1]江南大学环境与土木工程学院,无锡214122 [2]江苏省厌氧生物技术重点实验室,无锡214122 [3]江苏省水处理技术与材料协同创新中心,苏州215009 [4]江苏省生物质能与减碳技术工程实验室,无锡214122 [5]无锡宏普生物环保科技有限公司,无锡214125

出　　处：《环境工程学报》2021年第2期699-708,共10页Chinese Journal of Environmental Engineering

基　　金：国家重点研发计划(2016YFC0400707);江苏省“六大人才高峰”项目(2011-JNHB-004)。

摘　　要：以食品厂污水处理剩余污泥和玉米秸秆为堆肥原料,研究了氨三乙酸(NTA)在好氧堆肥过程中的保氮效果。结果表明,添加NTA可以提高好氧堆肥过程中氮素的保存和有机物的降解效率,当NTA的添加量为2.5%时,3 d内堆体即可到达高温期,高温期持续时间为9 d。与空白对照相比,堆肥结束时,NH3累积挥发量减少了15.20%,铵态氮、硝态氮和凯氏氮含量分别提高了242%、10.54%和10.62%;同时,二氧化碳累积排放量增加了13.47%,总有机碳含量降低了1.4%。堆肥结束时,堆肥产物的碳氮比和种子发芽指数分别为8.84和95.46%,达到了腐熟要求。堆肥过程中,NTA水解产生H+,可与氨化反应生成的NH3结合,这有利于堆体中氮素的保存,提高堆肥产品的肥效。本研究结果可为好氧堆肥保氮工艺优化提供参考。The waste activated sludge from wastewater treatment of food industry and corn stalks were used as raw composting materials,and the nitrogen retention efficiency of nitrilotriacetic acid(NTA)during aerobic composting was studied.The results showed that the addition of NTA improved the efficiency of nitrogen retention and organic matter degradation during aerobic composting.When the dosage of NTA added was 2.5%,a high temperature period was reached within 3 days,and lasted 9 days.Compared with the control,the cumulative NH3 volatilization decreased by 15.20%,and the contents of ammonium,nitrate,and Kjeldahl nitrogen increased by 242%,10.54%and 10.62%,respectively,at the end of composting.At the same time,the cumulative carbon dioxide emissions increased by 13.47%,and the total organic carbon content was reduced by 1.4%.The C/N ratio and seed germination index for the compost product were 8.84 and 95.46%,respectively,which met the requirements of maturity,at the end of composting.During the composting,NTA was hydrolyzed to produce H+,which was combined with NH3 produced by the ammoniation reaction.It was conducive to the preservation of nitrogen in the heap and improved the fertilizer efficiency of the compost products.The research result provided a useful reference for the optimization of the nitrogen retention during aerobic composting.

关 键 词：农业废弃物资源化 氨三乙酸 好氧堆肥化 氮素损失 

分 类 号：X705[环境科学与工程—环境工程]