EFFECT OF LOESS FLOCCULANT ON WATER PURIFICATION AND DISSOLVED ORGANIC MATTER REMOVAL IN SHAHU LAKE

PENG Yuyao; LI Panwu; GAO Xiaobo; YU Huibin; GUO Xujing

doi:10.13205/j.hjgc.202305019

Volume 41 Issue 5

May 2023

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Article Navigation > ENVIRONMENTAL ENGINEERING > 2023 > 41(5): 140-146

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PENG Yuyao, LI Panwu, GAO Xiaobo, YU Huibin, GUO Xujing. EFFECT OF LOESS FLOCCULANT ON WATER PURIFICATION AND DISSOLVED ORGANIC MATTER REMOVAL IN SHAHU LAKE[J]. ENVIRONMENTAL ENGINEERING , 2023, 41(5): 140-146. doi: 10.13205/j.hjgc.202305019

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EFFECT OF LOESS FLOCCULANT ON WATER PURIFICATION AND DISSOLVED ORGANIC MATTER REMOVAL IN SHAHU LAKE

doi: 10.13205/j.hjgc.202305019

1. College of Resources and Environment, Chengdu University of Information Technology, Chengdu 610225, China;
2. Watershed Research Center for Comprehensive Treatment of Water Environmental Pollution, Chinese Research Academy of Environmental Sciences, Beijing 100012, China;
3. Ningxia Research Academy of Environmental Sciences, Yinchuan 750001, China

Received Date: 2022-04-27

Abstract

Abstract

In this study, the loess in Shahu Lake was used as a flocculant to explore the water purification effect of flocculation, with diatomite used as a control group. Meanwhile, the purification effect of loess on dissolved organic matter (DOM) in Shahu Lake water was analyzed by synchronous fluorescence spectroscopy in combination with derivative fluorescence, parallel factor analysis and two-dimensional correlation spectroscopy. The results showed that the highest removal rates of TN, TP, COD_Mn and Chl.a were 28.85%, 51.52%, 24.87% and 42.86%, respectively. Shahu loess with grain sizes of 100, 200 mesh had a better flocculation effect on TP and TN. However, the flocculation effect of diatomite on TN was better than that of the loess. Five fluorescent components were identified in DOM parallel factor analysis (PARAFAC), among which the protein-like component was the dominant one. The loess flocculant had the highest removal effect (56.38%) on the protein-like fluorescent component (C5). The second derivative fluorescence could identify six fluorescence peaks. Among them, the removal rates of protein-, fulvic- and humic-like substances were 48.54%, 16.45% and 1.43%, respectively. The results of the two-dimensional correlation spectroscopy analysis showed that the preferential sequence of removal of the fluorescent components by loess flocculant followed the order of 285 nm→336 nm→369 nm, suggesting that protein-like fluorescent component was removed preferentially. Shahu loess can be used as a flocculant to purify Shahu Lake water.
- Shahu loess,
- flocculation,
- water quality,
- DOM,
- parallel factor analysis

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References

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