摘要
以大修渣(SPL)水浸液为处理对象,探讨了生物除氰无害化的可行性,具体开展碳氮比、接种量、装液量和氰浓度对生物降解的影响,以及降解菌群宏基因组学的功能基因分析研究.结果表明,降解菌群能以铁氰络合物(水浸液中总氰化物的主要形式)为唯一氮源生长,在碳氮比为6:1、接种量为10%即OD600值为(0.860±0.010)、75mL装液量条件下,对总氰浓度为50mg/L大修渣水浸液的降解率7d达到(65.2%±2.1%).在宏基因组中发现菌群有潜在的氰水合酶、硫代硫酸硫转酶和细胞色素bo等降解关键酶基因.本研究为大修渣工业危险废物氰的无害化处理提供了新的选择.
In the present study,the water leaching solution of spent pot lining(SPL)was used as the treated object,and the harmless disposal of cyanide through biodegradation was discussed.The effects of C/N ratio,inoculum amount,medium volume and cyanide concentration on biodegradation were investigated,and the functional genes were analyzed by the method of metagenomics.Results showed that iron cyanide complexes(the main form of total cyanide in the water leaching solution)could be used as the sole nitrogen source for the growth of degrading consortium.The degradation efficiency of 50mg/L total cyanide was achieved(65.2%±2.1%)within 7days at C/N ratio of 6:1,inoculation amount of 10%(OD600 value of 0.860±0.010)and 75mL of medium volume.Some potential genes encoding key enzymes were found in the metagenomics including cyanide hydratase,thiosulfate sulfotransferase and cytochrome bo complex.The biotreatment would provide a new option for the harmless disposal of cyanide in the industrial hazardous waste of SPL.
作者
陈昱光
李青云
沈慧婷
杜建嘉
林宏飞
刘幽燕
CHEN Yu-guang;LI Qing-yun;SHEN Hui-ting;DU Jian-jia;LIN Hong-fei;LIU You-yan(School of Chemistry and Chemical Engineering,Guangxi University,Nanning 530004,China;Guangxi Bossco Environmental Protection Technology Co.,Ltd,Nanning 530007,China)
出处
《中国环境科学》
EI
CAS
CSCD
北大核心
2023年第11期5884-5891,共8页
China Environmental Science
基金
国家自然科学基金资助项目(51108098)
广西大学科研基金资助项目(XJZ130360)。
关键词
大修渣
工业危险废物
总氰化物
无害化处理
生物降解
spent pot lining
industrial hazardous waste
total cyanide
harmless disposal
biodegradation
