液态硝酸钙原位修复黑臭底泥的研究现状及展望  

In-situ remediation of black-odor sediments through calcium nitrate:A review and perspective

作　　者：滕飞 王棚 段航宇 张泳纯 陶益 TENG Fei;WANG Peng;DUAN Hang-yu;ZHANG Yong-chun;TAO Yi(Shenzhen Key Laboratory of Ecological Remediation and Carbon Sequestration,Tsinghua Shenzhen International Graduate School,Tsinghua University,Shenzhen 518055,China)

机构地区：[1]清华大学深圳国际研究生院深圳市生态修复与固碳增汇重点实验室,广东深圳518055

出　　处：《环境生态学》2024年第1期111-121,共11页Environmental Ecology

基　　金：深圳市科技计划项目(JSGG20201102171401006)资助。

摘　　要：液态硝酸钙被广泛用于黑臭底泥的原位修复,其中硝酸盐作为电子受体优先于Fe(Ⅲ)和硫酸盐被微生物利用,其主要参与以反硝化作用为主导且兼有厌氧氨氧化(Anammox)和硝酸盐异化成铵(DNRA)反应的氮循环过程,驱动生物氧化过程去除底泥中AVS、亚铁及有机物等致黑臭物质。硝酸盐会抑制SO_(4)^(2-)和Fe(Ⅲ)作为电子受体产生S^(2-)和Fe(Ⅱ)的生物还原过程,从而在源头上抑制底泥返黑返臭。然而,底泥中直接注入液态硝酸钙,会使局部硝酸盐浓度过高而抑制功能微生物活性,硝酸盐快速释放至上覆水而导致其利用率低和二次污染风险,调控硝酸钙的释放速率有望解决该问题。Calcium nitrate has been widely applied in the in-situ remediation of black-odor sediments,in which nitrate is employed as electron acceptor and utilised with sulphate by microorganisms prior to Fe(Ⅲ),and the bio-processes involved such as Anammox and DNRA drive the bio-oxidation of eliminating AVS,Fe(Ⅱ)and relevant organic matters.Furthermore,calcium nitrate is able to inhibit the bio-reduction process in which SO_(4)^(2-) and Fe(Ⅲ)are act as electron acceptor,and so that the production of black-odor matters can be inhibited from the very beginning.However,the introduction of calcium nitrate into sediments may result in a high local nitrate concentration and microorganisms activity inhibition.In addition,a concentration gradient of calcium nitrate may form and result in the release of calcium nitrate into the overlying water with low utilisation efficiency,regulating the release rate of calcium nitrate is expected to solve this problem.

关 键 词：黑臭底泥 硝酸钙 修复原理 转化过程 

分 类 号：X522[环境科学与工程—环境工程] X171.4