Removal of nitrates and organic compounds from aqueous solutions by zero valent (ZVI) iron reduction coupled with coagulation/ precipitation proces

IF 1.4 4区环境科学与生态学 Q4 ENVIRONMENTAL SCIENCES

Archives of Environmental Protection Pub Date : 2023-04-01 DOI:10.24425/aep.2020.134532

E. Wiśniowska, M. Włodarczyk-Makuła

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引用次数: 0

Abstract

: The removal of nitrates from aqueous solutions is cumbersome because of their high solubility in water. The use of zero-valent iron (ZVI) for the reduction of nitrates is the chemical process and it is an alternative method to the biological ones. The aim of the present study was to evaluate the eﬀ ectiveness of nitrates removal from water solution by using the ZVI process. The process was coupled with the removal of COD, phosphates and turbidity by using by-products of nitrates reduction. Batch tests were performed to evaluate the eﬀ ectiveness of ZVI in the removal of nitrates from aqueous solutions. The eﬀ ectiveness of nitrates removal was analyzed after 5, 10, 20, 30 and 60 min. and compared to the initial concentration of pollutants. Simultaneously analysis of ammonium nitrogen and nitrites was controlled to identify products of nitrates reduction under various pH. The removal of COD, phosphates and turbidity was also performed in batch tests. The eﬀ ectiveness of the emoval by using three types of chemicals was compared – PIX, FeSO 4 , and waste Fe 2+ /Fe 3+ from the ZVI process. The results obtained in the study indicate that ZVI can be eﬀ ectively used in the treatment of water polluted with nitrates and the by-products of the process could be further applied in the removal of COD, phosphates and turbidity. Based on the results the

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零价(ZVI)铁还原结合混凝/沉淀法去除水溶液中的硝酸盐和有机化合物

由于硝酸盐在水中的溶解度很高，所以从水溶液中去除硝酸盐是很麻烦的。利用零价铁(ZVI)还原硝酸盐是一种化学过程，是替代生物过程的一种方法。本研究的目的是评价ZVI工艺对水溶液中硝酸盐的去除效果。该工艺与利用硝酸盐还原副产物去除COD、磷酸盐和浊度相结合。进行了批量试验，以评估ZVI去除水溶液中硝酸盐的有效性。分别在5、10、20、30和60 min后对硝酸盐的去除效果进行了分析，并与初始污染物浓度进行了比较。同时控制了铵态氮和亚硝酸盐的分析，确定了不同ph值下硝酸盐还原产物，并进行了COD、磷酸盐和浊度的去除试验。比较了三种化学药剂——PIX、feso4和ZVI工艺废铁2+ / fe3 +的去除效果。研究结果表明，ZVI可有效地用于硝酸盐污染水体的处理，其副产物可进一步用于COD、磷酸盐和浊度的去除。基于结果

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来源期刊

Archives of Environmental Protection ENVIRONMENTAL SCIENCES-

CiteScore

2.70

自引率

26.70%

发文量

期刊介绍： Archives of Environmental Protection is the oldest Polish scientific journal of international scope that publishes articles on engineering and environmental protection. The quarterly has been published by the Institute of Environmental Engineering, Polish Academy of Sciences since 1975. The journal has served as a forum for the exchange of views and ideas among scientists. It has become part of scientific life in Poland and abroad. The quarterly publishes the results of research and scientific inquiries by best specialists hereby becoming an important pillar of science. The journal facilitates better understanding of environmental risks to humans and ecosystems and it also shows the methods for their analysis as well as trends in the search of effective solutions to minimize these risks.