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  • 學位論文

結合物化及生物處理程序去除EDTA及金屬螯合物

Integration of physical-chemical and biological processes for the treatment of EDTA and metal-EDTA complexes

譚光勛(Kuang-Hsun Tan)
指導教授 ： 李奇旺
淡江大學/工學院/水資源及環境工程學系碩士班/碩士(2020年)
https://doi.org/10.6846/TKU.2020.00582
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摘要

本研究利用高級氧化方法進行預處理(如UV/PS處理及臭氧處理)，並結合好氧生物處理來處理不易生物降解的有機物(如EDTA)，針對UV/PS及臭氧這兩項程序進行研究，並比較兩項程序對EDTA及金屬-EDTA的去除效率。利用UV對Persulfate (PS)於30分鐘的光催化反應下及相對於100%的理論PS完全氧化EDTA的劑量 (即PS與EDTA莫爾比為17:1)，進行光催化處理EDTA及金屬-EDTA廢水，於EDTA、Fe(II)EDTA和CuEDTA的廢水中TOC去除率分別為68.46%、30.97%及94.96%，並將pH調整到7時，銅跟鐵的去除率分別為95.34%及97.61%。然而利用臭氧程序處理EDTA及金屬-EDTA最高的TOC去除率只有10%，銅跟鐵的去除率幾乎為零，由於反應時間太短，導致無法行成氫氧根降解EDTA及金屬-EDTA。 利用UV/PS程序對EDTA及金屬-EDTA進行預處理並結合好氧生物程序進一步處理，在EDTA的廢水中，PS劑量為30%的理論COD、在Fe(II)EDTA的廢水中，PS劑量為10%的理論COD。經由UV/PS進行預處理再用好氧生物處理進一步處理，EDTA廢水及Fe(II)EDTA的TOC去除率皆可達到60%， 將有機負荷率分別控制在1 kg/m3-day 及0.5 kg/m3-day於EDTA及Fe(II)EDTA的廢水。未進行預處理及利用臭氧處理方法進行預處理的TOC去除率僅僅1%，但採用UV/PS進行預處理時，TOC去除效率可以達60%。

關鍵字

臭氧 ； 過硫酸鹽 ； 光催化 ； EDTA ； 好氧生物處理

並列摘要

In this study, pre-treatment processes such as ozonation and photocatalysis of persulfate (UV/PS), followed by aerobic biological treatment process were employed to treat recalcitrant organic substances, i.e., EDTA and metal-EDTA wastewater. In the UV/PS process, the removal of TOC reached 68.46, 26.75, and 93.16% for EDTA, Fe(II)EDTA, and CuEDTA, respectively, and after adjusting pH to 7 the removal of Cu and Fe was 95.34% and 97.61%, respectively, at PS:EDTA molar ratio of 17:1 corresponding to 100% of the theoretic PS dosage required to oxidize EDTA completely and irradiation time of 30 min. Meanwhile, the highest removal of TOC using ozonation process was only 10% for both EDTA and metal-EDTA and Cu and Fe removal were negligible. It is due to insufficient reaction time for generating enough OH• to degrade EDTA and metal-EDAT. With the UV/PS pre-treatment process using 30% and 10% of the theoretical PS dosage required for complete oxidation of the theoretical COD for EDTA wastewater and Fe(II)EDTA wastewater, respectively. TOC removal was 60% with the organic loading rate of 1 kg/m3-day for EDTA wastewater and removal was 60% with organic loading rate of 0.5 kg/m3-day for the Fe(II)EDTA wastewater. The TOC removal using aerobic process without pre-treatment or using ozone pre-treatment were negligible (∼1%).

並列關鍵字

Ozonation ； Persulfate ； Photocatalysis ； EDTA ； Aerobic biological process

參考文獻

[1] B. C. Han and T. C. Hung, (1990) “Green oysters caused by copper pollution on the Taiwan coast” Environmental Pollution 65 : 347–362. DOI: 10.1016/ 0269-7491(90)90126-W.
[2] K. L. Fry, C. A. Wheeler, M. M. Gillings, A. R. Flegal, and M. P. Taylor, (2020) “Anthropogenic contamination of residential environments from smelter As, Cu and Pb emissions: Implications for human health” Environmental Pollution 262 : 114235. DOI: 10.1016/j.envpol.2020.114235.
[3] Water pollution control policy and permission application regulation. https:// law. moj. gov. tw/ LawClass/ LawAll. aspx? pcode= O0040004. Environmental Protection Administration, Taiwan (ROC), 2016.
[4] The Status of Heavy Metal Pollution at Farmland in Taiwan. https://law.coa. gov.tw/glrsnewsout/LawContent.aspx?id=GL000066. Council of Agriculture, Taiwan (ROC), 2016.
[5] R. S. Juang and S. W. Wang, (2000) “Metal recovery and EDTA recycling from simulated washing effluents of metal-contaminated soils” Water Research 34 : 3795–3803. DOI: 10.1016/S0043-1354(00)00118-4.

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