Transformation of algae inclusions during ozonation of algae-laden water and the advanced treatment of ozonized effluent by resin adsorption
HU Yun1,2,, LI Xiang1,2, LU Changchen1,2, WANG Guoxiang1,2,,, LI Qimeng1,2 1.School of Environment, Nanjing Normal University, Nanjing 210023, China 2.Jiangsu Key Laboratory of Environment Change and Ecological Construction, Jiangsu Engineering Laboratory of Water and Soil Eco-Remediation, Nanjing 210023, China
Abstract:Many lakes, reservoirs and other water bodies in China are seriously eutrophicated with the occurenc of seasonal cyanobacteria blooms, which seriously threatens the safety of drinking water. In this study, water samples with different algal contents were treated by ozonation, and the release and transformation of algal inclusions during the oxidation process were investigated. The dynamic changes of water quality parameters such as dissolved organic carbon (DOC), chlorophyll a (Chl-a), ${\rm{NH}}_4^{+} $-N, ${\rm{NO}}_3^{-} $-N, total nitrogen (TN), total phosphorus (TP) and microcystin-LR (MC-LR) were analyzed. According to the characteristics of high DOC and ${\rm{NO}}_3^{-} $-N contents in the oxidized effluent, commercial A520 and magnetic MIEX resin were selected for advanced adsorption treatment. The results showed that with the prolongation of ozonation time, the cell inclusions in granular algae were gradually dissolved and degraded by oxidation. For water samples with high algal content, ${\rm{NH}}_4^{+} $-N accumulated rapidly during the oxidation process, and the organic nitrogen mainly converted to ${\rm{NH}}_4^{+} $-N. However, for water samples with low algal content, organic nitrogen and ${\rm{NH}}_4^{+} $-N rapidly converted to ${\rm{NO}}_3^{-} $-N, and the final ratio of ${\rm{NH}}_4^{+} $-N to TN was less than 10%. The concentration of MC-LR increased first and then decreased during the ozonation processes, and the the undegraded could be effectively removed by two kinds of anion-exchange resins. Meanwhile, the contents of DOC and ${\rm{NO}}_3^{-} $-N in water can be significantly reduced by resin adsorption treatment. Therefore, ozonation coupled with anion exchange resin adsorption can realize the deep purification of algae-laden water, providing a new idea for emergency treatment of algae-laden water. Key words:algae blooms/ excitation-emission matrix spectroscopy/ oxidative degradation/ anion exchange resin/ microcystin-LR.
图1不同臭氧化时间下含藻水样的Chl-a和MC-LR质量浓度变化 Figure1.Variations in Chl-a and MC-LR concentrations of algae-laden water samples at different ozonation times
图4不同臭氧化时间下含藻水样的UV指数变化(1 345 μg·L?1 Chl-a) Figure4.Variations of UV index of algae-laden water samples at different ozonation times (1 345 μg·L?1 Chl-a)
图5不同臭氧化时间下含藻水样的${{\bf{NH}}_4^{+}} $-N、${{\bf{NO}}_3^{-} }$-N、TN质量浓度变化 Figure5.Variations in concentration of ${{\rm{NH}}_4^{+}} $-N, ${{\rm{NO}}_3^{-}} $-N and TN of algae-laden water samples at different ozonation times
图82种树脂对含藻水臭氧化出水中${{\bf{NO}}_3^{-}} $-N和DOC的去除率变化 Figure8.Variations in ${{\rm{NO}}_3^{-}} $-N and DOC removal from ozonized effluent from algae-laden water by two kinds of resin
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1.School of Environment, Nanjing Normal University, Nanjing 210023, China 2.Jiangsu Key Laboratory of Environment Change and Ecological Construction, Jiangsu Engineering Laboratory of Water and Soil Eco-Remediation, Nanjing 210023, China Received Date: 2021-07-07 Accepted Date: 2021-10-18 Available Online: 2021-12-21 Keywords:algae blooms/ excitation-emission matrix spectroscopy/ oxidative degradation/ anion exchange resin/ microcystin-LR Abstract:Many lakes, reservoirs and other water bodies in China are seriously eutrophicated with the occurenc of seasonal cyanobacteria blooms, which seriously threatens the safety of drinking water. In this study, water samples with different algal contents were treated by ozonation, and the release and transformation of algal inclusions during the oxidation process were investigated. The dynamic changes of water quality parameters such as dissolved organic carbon (DOC), chlorophyll a (Chl-a), ${\rm{NH}}_4^{+} $-N, ${\rm{NO}}_3^{-} $-N, total nitrogen (TN), total phosphorus (TP) and microcystin-LR (MC-LR) were analyzed. According to the characteristics of high DOC and ${\rm{NO}}_3^{-} $-N contents in the oxidized effluent, commercial A520 and magnetic MIEX resin were selected for advanced adsorption treatment. The results showed that with the prolongation of ozonation time, the cell inclusions in granular algae were gradually dissolved and degraded by oxidation. For water samples with high algal content, ${\rm{NH}}_4^{+} $-N accumulated rapidly during the oxidation process, and the organic nitrogen mainly converted to ${\rm{NH}}_4^{+} $-N. However, for water samples with low algal content, organic nitrogen and ${\rm{NH}}_4^{+} $-N rapidly converted to ${\rm{NO}}_3^{-} $-N, and the final ratio of ${\rm{NH}}_4^{+} $-N to TN was less than 10%. The concentration of MC-LR increased first and then decreased during the ozonation processes, and the the undegraded could be effectively removed by two kinds of anion-exchange resins. Meanwhile, the contents of DOC and ${\rm{NO}}_3^{-} $-N in water can be significantly reduced by resin adsorption treatment. Therefore, ozonation coupled with anion exchange resin adsorption can realize the deep purification of algae-laden water, providing a new idea for emergency treatment of algae-laden water.
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