4.7 Article

Electrochemical oxidation of landfill leachate using boron-doped diamond anodes: pollution degradation rate, energy efficiency and toxicity assessment

期刊

ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
卷 29, 期 43, 页码 65625-65641

出版社

SPRINGER HEIDELBERG
DOI: 10.1007/s11356-022-19915-3

关键词

Landfill leachates; Boron-doped diamond electrode (BDD); Advanced oxidation process; Multistep-oxidation pathways; Ecotoxicology; Biodegradability; Degradation efficacy

资金

  1. project DIAOPS-effective removal of micropollutants from wastewater using electrochemical oxidation on nanocrystalline diamond anodes
  2. Regional Fund for Environmental Protection and Water Management in Gdansk, Poland [RX-15/13/2017]

向作者/读者索取更多资源

Electrochemical oxidation (EO) using boron-doped diamond electrodes (BDDs) was effective in treating landfill leachate (LL), with lower boron doping concentration leading to better performance. EO inactivated bacterial cells within 2 hours, possibly due to the penetration and reaction of electrogenerated oxidants. The toxicity of EO-treated LLs was lower than raw ones, suggesting that appropriate electrolysis parameters can reduce toxicity without compromising nutrient removal and disinfection capabilities, although the salinity and oxidation pathways of LLs require further investigation.
Electrochemical oxidation (EO), due to high efficiency and small carbon footprint, is regarded as an attractive option for on-site treatment of highly contaminated wastewater. This work shows the effectiveness of EO using three boron-doped diamond electrodes (BDDs) in sustainable management of landfill leachate (LL). The effect of the applied current density (25-100 mA cm(-2)) and boron doping concentration (B/C ratio: 500 ppm, 10,000 ppm and 15,000 ppm) on the performance of EO was investigated. It was found that, of the electrodes used, the one most effective at COD, BOD20 and ammonia removal (97.1%, 98.8% and 62%, respectively) was the electrode with the lowest boron doping. Then, to better elucidate the ecological role of LLs, before and after EO, cultivation of faecal bacteria and microscopic analysis of total (prokaryotic) cell number, together with ecotoxicity assay (Daphnia magna, Thamnocephalus platyurus and Artemia salina) were combined for the two better-performing electrodes. The EO process was very effective at bacterial cell inactivation using each of the two anodes, even within 2 h of contact time. In a complex matrix of LLs, this is probably a combined effect of electrogenerated oxidants (hydroxyl radicals, active chlorine and sulphate radicals), which may penetrate into the bacterial cells and/or react with cellular components. The toxicity of EO-treated LLs proved to be lower than that of raw ones. Since toxicity drops with increased boron doping, it is believed that appropriate electrolysis parameters can diminish the toxicity effect without compromising the nutrient-removal and disinfection capability, although salinity of LLs and related multistep-oxidation pathways needs to be further elucidated.

作者

我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。

评论

主要评分

4.7
评分不足

次要评分

新颖性
-
重要性
-
科学严谨性
-
评价这篇论文

推荐

暂无数据
暂无数据