引用本文:莫华涛,李海翔,杨敏,等.基于硝酸盐缓释-功能微生物协同的污染底泥原位修复技术研究[J].环境科学研究,2020,33(6):1451-1458.
MO Huatao,LI Haixiang,YANG Min,et al.In-situ Remediation of Contaminated Sediment Based on Nitrate Slow Release-Functional Microbial Compounding[J].Research of Environmental Sciences,2020,33(6):1451-1458.]
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基于硝酸盐缓释-功能微生物协同的污染底泥原位修复技术研究
莫华涛1,2, 李海翔1, 杨敏2,3, 李锟2,3, 彭剑峰4
1. 桂林理工大学环境科学与工程学院, 广西 桂林 541006;2. 中国科学院生态环境研究中心, 中国科学院饮用水科学与技术重点实验室, 北京 100085;3. 中国科学院大学, 北京 100049;4. 清华大学水质与水生态研究中心, 北京 100084
摘要:
重污染底泥原位修复常需外加大量电子受体,但大量实践表明电子受体直接投加存在作用时效短、微生物利用效率低等问题.针对该问题,开发了电子受体缓释-功能微生物协同的复合环境功能材料,并探讨了功能材料对底泥原位修复效果.结果表明:①复合功能材料〔以Ca(NO32计,下同〕仅投加5.7 g/kg时,底泥中ORP(氧化还原电位)提升了60.17%~73.96%,AVS(酸可挥发性硫化物)去除率高达90%,是其他传统原位修复材料的1倍.②相较于单独投加Ca(NO32的修复方式,复合功能材料最大可去除上覆水中33.78%的ρ(TN),而且ρ(NH4+-N)也降低了27.90%.③复合功能材料同时促进上覆水中TP和CODCr的去除,其去除率分别在78%和30%以上.④从经济成本和对环境影响的角度出发,在工程应用上宜用电子受体:固定剂:促凝剂:发泡剂:塑形剂:复合微生物菌剂:水的质量比为1:5:0.5:0.5:0.1:1:1的复合功能材料.研究显示,硝酸盐缓释-功能微生物复合材料是一种高效的重污染底泥原位修复材料,能显著提升底泥和上覆水中污染物去除效率,降低ρ(NH4+-N)、ρ(CODCr),避免上覆水体受到二次污染.
关键词:  水体底泥  原位修复  电子受体缓释  功能微生物  复合功能材料
DOI:10.13198/j.issn.1001-6929.2019.05.27
分类号:X522
基金项目:国家自然科学基金项目(No.51878197);北京市科技重大专项项目(No.Z181100005318001)
In-situ Remediation of Contaminated Sediment Based on Nitrate Slow Release-Functional Microbial Compounding
MO Huatao1,2, LI Haixiang1, YANG Min2,3, LI Kun2,3, PENG Jianfeng4
1. College of Environmental Science and Engineering, Guilin University of Technology, Guilin 541006, China;2. Key Laboratory of Drinking Water Science and Technology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China;3. University of Chinese Academy of Sciences, Beijing 100049, China;4. Center for Water and Ecology, Tsinghua University, Beijing 100084, China
Abstract:
In-situ remediation of black odorous water often requires the addition of a large number of electron acceptors, but a lot of practices have proved that the direct addition of electron acceptors has short-acting effects and low microbial action efficiency, which limits the development of in-situ remediation technology for heavily polluted sediments. In response to this problem, an environmental functional material for the electron-receptor slow release-functional microbial synergy was developed, and the in-situ repair effect of functional materials on the sediment was discussed. The results show that: (1) When only 5.7 g/kg of the composite functional material (as calcium nitrate) was used, the ORP (redox potential) of the sediment increased by 60.17%-73.96%, and the AVS (acid volatile sulfide) removal rate increased up to 90%, with removal efficiency being double that of the other traditional in-situ remediation materials. (2) Compared with the remediation of adding Ca(NO3)2 only, the composite functional material could remove 33.78% of TN and NH4+-N concentration was reduced by 27.90%. (3) The composite functional materials also promoted the removal of TP and CODCr in overlying water, the removal was as high as 78% and 30%, respectively. (4) From the perspective of economic cost and environmental impact, it was suggested to use compounding functional materials in engineering applications, with the mass ratio of electron acceptor:fixative:coagulant:foaming agent:plasticizer:compound microbial agent:water being 1:5:0.5:0.5:0.1:1:1. This study shows that the nitrate slow release-functional micro composite is a highly efficient in-situ remediation material for black odorous water sediments. It can significantly improve the removal efficiency of the sediments and overlying water pollutants, decrease the concentration of NH4+-N and CODCr, and prevent secondary pollution of the overlying water.
Key words:  sediment of black odorous water  in-situ repairment  electron receptor slow-release  functional microorganism  composite functional material