EFFICIENCY AND MECHANISM OF UV/O3-Na2S2O8 IN TREATING ACTIVATED CARBON REGENERATION CONDENSATE WASTEWATER

WANG Yan; ZOU Lv-xi; MAO Lin-feng; CHEN Ya-li; LI Ji

doi:10.13205/j.hjgc.202007006

Volume 38 Issue 7

Nov. 2020

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Article Navigation > ENVIRONMENTAL ENGINEERING > 2020 > 38(7): 38-44

WANG Yan, ZOU Lv-xi, MAO Lin-feng, CHEN Ya-li, LI Ji. EFFICIENCY AND MECHANISM OF UV/O3-Na2S2O8 IN TREATING ACTIVATED CARBON REGENERATION CONDENSATE WASTEWATER[J]. ENVIRONMENTAL ENGINEERING , 2020, 38(7): 38-44. doi: 10.13205/j.hjgc.202007006

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WANG Yan, ZOU Lv-xi, MAO Lin-feng, CHEN Ya-li, LI Ji. EFFICIENCY AND MECHANISM OF UV/O₃-Na₂S₂O₈ IN TREATING ACTIVATED CARBON REGENERATION CONDENSATE WASTEWATER[J]. ENVIRONMENTAL ENGINEERING , 2020, 38(7): 38-44. doi: 10.13205/j.hjgc.202007006

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EFFICIENCY AND MECHANISM OF UV/O₃-Na₂S₂O₈ IN TREATING ACTIVATED CARBON REGENERATION CONDENSATE WASTEWATER

doi: 10.13205/j.hjgc.202007006

WANG Yan^1,2,
ZOU Lv-xi¹,
MAO Lin-feng³,
CHEN Ya-li³,
LI Ji^{1,4,5
,
,}

1. School of Environment and Civil Engineering, Jiangnan University, Wuxi 214122, China;
2. Jiangsu GL Technology Co., Ltd, Wuxi 214106, China;
3. Yingtec Environment & Technology(Wuxi) Co., Ltd, Wuxi 214000, China;
4. Jiangsu Key Laboratory of Anaerobic Biotechnology, Wuxi 214122, China;
5. Jiangsu University Collaborative Innovation Center of Water Treatment Technology and Material, Suzhou 215009, China

Received Date: 2020-02-15

Abstract

Abstract

During the regeneration of activated carbon by superheated steam method, a large amount of condensed wastewater containing refractory organics will be produced. In order to remove the refractory COD in the condensed wastewater, improve the biodegradability and facilitate the subsequent biodegradation, UV/ozone activated persulfate(UV/O₃-Na₂S₂O₈) oxidation system was used to treat the activated carbon regeneration condensate wastewater. The effects of ozone dosage, initial pH and Na₂S₂O₈ dosage on the treatment efficiency of the organics were investigated. The changes in the treatment process of the condensate wastewater were investigated by means of infrared spectrum, UV-Vis spectrum and three-dimensional fluorescence. The results showed that when the dosage of ozone was 30 mg/L, pH was 9.0, and Na₂S₂O₈ dosage was 0.4 g/L, the removal rate of COD and chroma(CN) was 82.1% and 86.3%, respectively. The biodegradability of condensed wastewater was improved, and the BOD₅/COD value was increased from 0.17 to 0.46. It could be found from the characterization of dissolved organic matter(DOM) in condensed wastewater that humus and chromophore in DOM were oxidized continuously, and the aromatization degree was reduced. Tryptophan organics were effectively removed. The results showed that UV/O₃-Na₂S₂O₈ oxidation system could effectively remove the organics in the condensed wastewater.
- UV/ozone activation,
- persulfate,
- condensate wastewater,
- processing efficiency,
- degradation mechanism

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