摘要
利用硝酸钙、反硝化微生物和固化剂制备了一种缓释复合材料,分别探讨不同固化剂投加比的缓释材料对批次和现场试验中上覆水及底泥的修复效果。结果表明,缓释颗粒能够有效控制NO_(3)^(-)-N释放率。在批次试验第30天且m(硝酸钙):m(固化剂)=20:1时,相比直接投加Ca(NO_(3))_(2),上覆水NH_(4)^(+)-N,TN和COD浓度最高可降低72.3%,63.2%和48.8%,底泥中酸可挥发性硫化物(AVS)去除率高达91.1%。缓释材料在现场示范研究中得以有效应用,证明基于硝酸钙-微生物协同作用的缓释颗粒是一种有效的重污染底泥原位修复材料。探讨了“先泥后水”的水生态修复新模式,对高效消除底泥黑臭和重建好氧微生态系统具有重要意义。
A sustained-release composite was prepared using calcium nitrate,denitrifying microorganism and a curing agent.In batch and field tests,the remediation performance of different sustained-release materials with different curing agent content on the overlying water and the contaminated sediment was investigated.The results show that the sustainedrelease particles can effectively control the release rate of NO_(3)^(-)-N.Compared with the direct addition of Ca(NO_(3))_(2),the NH_(4)^(+)-N,TN and COD concentration in the overlying water can be reduced by 72.3%,63.2%and 48.8%on the 30 th day of the batch test.When the mass ratio of calcium nitrate to curing agent is 20:1,the removal efficiency of acid volatile sulfide (AVS) in sediment reaches 91.1%.The sustained-release material has been effectively applied in the field study,which proves that the sustained-release particles based on the synergistic effect of calcium nitrate and microorganisms are a kind of in-situ remediation material for heavily polluted sediment.The novel water ecological restoration model of"Treating sediment before water"is discussed,which plays an important role in eliminating the black-odor of sediment and rebuilding the aerobic microecosystem.
作者
李宁
吴琼
罗欢
庞素艳
杨旭楠
张淦
LI Ning;WU Qiong;LUO Huan;PANG Su-yan;YANG Xu-nan;ZHANG Gan(Key Laboratory of Pearl River Estuary Regulation and Protection of the Ministry of Water Resources,Pearl River Water Resources Research Institute,Pearl River Water Resources Commission of the Ministry of Water Resources,Guangzhou 510611,China;School of Municipal and Environment Engineering,Jilin Jianzhu University,Guangzhou 130118,China;Institute of Microbiology,Guangdong Academy of Sciences,Guangzhou 510070,China)
出处
《环境科技》
2022年第6期6-12,共7页
Environmental Science and Technology
基金
国家自然科学基金青年科学基金项目(52000039)
珠科院科技创新自立项目([2022]YF005)。
关键词
污染底泥
原位修复
硝酸钙
反硝化细菌
缓释材料
Contaminated sediment
In situ bioremediation
Calcium nitrate
Denitrifying bacteria
Sustained-release material
