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Vacuum ultraviolet irradiation for mitigating dissolved organic nitrogen and formation of haloacetonitriles.
Environmental Research ( IF 7.7 ) Pub Date : 2020-04-02 , DOI: 10.1016/j.envres.2020.109454
Pradabduang Kiattisaksiri 1 , Eakalak Khan 2 , Patiparn Punyapalakul 3 , Charongpun Musikavong 4 , Daniel C W Tsang 5 , Thunyalux Ratpukdi 6
Affiliation  

The main objective of this work was to investigate the feasibility of using vacuum ultraviolet (VUV, 185 + 254 nm) and ultraviolet (UV, 254 nm) for the reduction of dissolved organic nitrogen (DON) and haloacetonitrile formation potential (HANFP) of surface water and treated effluent wastewater samples. The results showed that the reduction of dissolved organic carbon (DOC), DON, hydrophobicity (HPO), absorbance at 254 nm (UV254), and fluorescence excitation-emission matrix (FEEM) of both water samples by VUV was higher compared to using UV. The addition of H2O2 remarkably improved the performances of VUV and UV. VUV/H2O2 exhibited the highest removal efficiency for DOC and DON. Even though HANFP increased at the early stage, its concentration decreased (19-72%) at the end of treatment (60 min). Decreases in DON (30-41%) and DOC (51-57%) led to HANFP reduction (53-72%). Moreover, FEEM revealed that substantial reduction in soluble microbial product-like compounds (nitrogen-rich organic) had a strong correlation with HANFP reduction, implying that this group of compounds act as a main precursor of HANs. The VUV/H2O2 system significantly reduced HANFP more than UV/H2O2 and therefore is suitable for controlling HAN precursors and HAN formation in drinking water and reclaimed wastewater.

中文翻译:

真空紫外线辐射可减轻溶解的有机氮并形成卤代乙腈。

这项工作的主要目的是研究使用真空紫外线(VUV,185 + 254 nm)和紫外线(UV,254 nm)减少表面可溶性有机氮(DON)和卤代乙腈形成潜力(HANFP)的可行性。水和处理后的废水样本。结果表明,与使用UV相比,使用VUV两种水样品对溶解有机碳(DOC),DON,疏水性(HPO),在254 nm处的吸光度(UV254)和荧光激发发射矩阵(FEEM)的减少均较高。 。H2O2的添加显着改善了VUV和UV的性能。VUV / H2O2对DOC和DON的去除效率最高。即使HANFP在早期增加,但在治疗结束(60分钟)时其浓度却降低了(19-72%)。DON(30-41%)和DOC(51-57%)的下降导致HANFP下降(53-72%)。此外,FEEM还表明,可溶性微生物产物样化合物(富氮有机物)的大量减少与HANFP的减少有很强的相关性,这表明这组化合物是HANs的主要前体。VUV / H2O2系统比UV / H2O2显着降低了HANFP,因此适用于控制饮用水和再生废水中的HAN前体和HAN的形成。
更新日期:2020-04-03
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