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Simultaneous removal of nitrate and phosphate in groundwater using Ca-citrate complex
Environmental Science and Pollution Research ( IF 5.8 ) Pub Date : 2021-03-06 , DOI: 10.1007/s11356-021-13312-y
Jiyoung Kang 1 , Sung-Wook Jeen 1, 2
Affiliation  

Eutrophication can be caused by excessive input of nutrients, such as nitrate and phosphate, to surface water. Nutrients in groundwater can enter surface water by means of base flow, requiring treatment before they reach surface water bodies. While some studies have attempted to remove nitrate and phosphate, methods for simultaneous removal in groundwater have rarely been reported. In this study, we propose an innovative treatment method to simultaneously remove nitrate and phosphate in groundwater based on an injection of Ca-citrate complex. A total of five batch experiments with different conditions were conducted to identify the removal mechanisms of nitrate and phosphate and to evaluate the use of alternative organic materials, such as lactate. The results showed that Ca-citrate complex can remove nitrate and phosphate simultaneously. Nitrate was removed through denitrification by denitrifying bacteria which used citrate as a carbon source. The removal mechanisms for phosphate were precipitation of phosphate minerals (e.g., hydroxyapatite) and adsorption. The results also showed that reactive materials based on Ca-lactate complex were able to remove nitrate and phosphate. This study suggests that nitrate and phosphate in groundwater can simultaneously be removed using organic-based calcium complexes, proposing a promising remedial method to alleviate potential eutrophication in surface water as well as groundwater contamination.



中文翻译:

使用柠檬酸钙络合物同时去除地下水中的硝酸盐和磷酸盐

过多的营养物(例如硝酸盐和磷酸盐)输入地表水中会引起富营养化。地下水中的养分可以通过基流进入地表水,需要先进行处理,然后才能到达地表水体。尽管一些研究尝试去除硝酸盐和磷酸盐,但很少有报道同时去除地下水中的硝酸盐和磷酸盐的方法。在这项研究中,我们提出了一种创新的处理方法,可通过注入柠檬酸钙复合物来同时去除地下水中的硝酸盐和磷酸盐。总共进行了五个在不同条件下进行的批次实验,以确定硝酸盐和磷酸盐的去除机理,并评估替代有机材料(如乳酸)的使用。结果表明,柠檬酸钙配合物可以同时去除硝酸盐和磷酸盐。通过使用硝酸盐作为碳源的细菌的反硝化作用,通过反硝化作用去除硝酸盐。磷酸盐的去除机理是磷酸盐矿物质(例如羟基磷灰石)的沉淀和吸附。结果还表明,基于乳酸钙复合物的反应性材料能够去除硝酸盐和磷酸盐。这项研究表明,可以使用有机钙络合物同时去除地下水中的硝酸盐和磷酸盐,从而提出了一种有希望的补救方法,以减轻地表水中潜在的富营养化以及地下水污染。结果还表明,基于乳酸钙复合物的反应性材料能够去除硝酸盐和磷酸盐。这项研究表明,可以使用有机钙络合物同时去除地下水中的硝酸盐和磷酸盐,从而提出了一种有希望的补救方法,以减轻地表水中潜在的富营养化以及地下水污染。结果还表明,基于乳酸钙复合物的反应性材料能够去除硝酸盐和磷酸盐。这项研究表明,可以使用有机钙络合物同时去除地下水中的硝酸盐和磷酸盐,从而提出了一种有希望的补救方法,以减轻地表水中潜在的富营养化以及地下水污染。

更新日期:2021-03-07
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