Analysis of water quality in Saigon River water and its treatment by traditional coagulation – flocculation

In natural water, colloidal particles play an important role in the transport of organic compounds, including pollutants. The analysis of colloidal particles creates more bases for the selection of river water treatment technology, making the treatment more efficient. In this study, the size and zet...

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Bibliographic Details
Published in:IOP conference series. Earth and environmental science 2021-02, Vol.652 (1), p.12013
Main Authors: Khanh, Bui Van, Duyen, Tran Thi My, Hien, Lam Pham Thanh, Que, Vo Nguyen Xuan, Huy, Nguyen Nhat
Format: Article
Language:English
Subjects:
Coagulation
Coliforms
Colloids
Flocculation
Organic compounds
Pollutants
Pollution dispersion
Rivers
Sand filters
Stability
Statistical analysis
Statistical methods
Treated water
Turbidity
Water analysis
Water purification
Water quality
Water treatment
Zeta potential
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Summary:In natural water, colloidal particles play an important role in the transport of organic compounds, including pollutants. The analysis of colloidal particles creates more bases for the selection of river water treatment technology, making the treatment more efficient. In this study, the size and zeta potential of colloidal particles in Saigon river water were determined. Seven sampling sites were randomly selected along the river length in Ho Chi Minh City. One of the locations was selected to investigate colloidal properties at different times (i.e. 10 samples). The results showed that the colloidal particles have poor stability with Zeta potentials in the range from -19 mV to -12 mV. Besides, statistical analysis showed that the zeta potential had an inverse correlation with the pH value and the permanganate index with the significant coefficients of -0.67 and -0.73, respectively. The size of colloidal particles in water is not uniform; however, due to poor stability, part of the particles join together and settle down. Coagulation-flocculation-sedimentation-rapid sand filtration experiments were also performed to remove colloidal particles from the water. The treated water has low turbidity with a removal efficiency of 97%. This shows that the colloidal particles presented in the Saigon River water could be easily removed by the traditional physicochemical method. However, the parameters of the permanganate index and Coliforms did not meet the standard of QCVN 01-1/2018/BYT for drinking purposes, which still require further treatment.
ISSN:1755-1307
1755-1315
DOI:10.1088/1755-1315/652/1/012013