Experimental Research on Removal of UV254 by PFS in Pi River water with low turbidity

Ru-Sheng Jia,Yu-Lan Gao,R Weerasinghe,C.-H Weng,J Wu

doi:10.1051/e3sconf/202019404038

Abstract

Through beaker test, it was analyzed the effect on the removal of turbidity, chroma and UV254 in PI River water with low turbidity by poly-ferric sulfate(PFS).The results showed that it has good effect on removing turbidity and chroma by adding PFS, but it was normal to UV254, not exceed 50%,with the increase of PFS dosage, the turbidity and chroma removal trend is similar to that of UV254. For turbidity removal, the optimal dosage of PFS was 70 mg / L, and for UV254 removal, the optimal pH value range is not neutral, and it is speculated that PFS mainly neutralizes pollutants during coagulation in PI River water.

Highlights

Polymerized ferric sulfate (PFS) is widely used in the field of water treatment due to its advantages of short coagulation reaction time, low price, wide range of pH application,less residual iron ions and good dehydration performance of hydrolysate[3].,it is discussed the effect of coagulation treatment by the PFS coagulant for the PI river water,which are used turbidity,chroma,UV254 as the main measurement indicators
When the dosage of PFS increases from 30 mg / L to 70 mg / L, the turbidity removal rate increases slowly from 81.88% to 88.05%, the color removal rate increases from 47.86% to 73.54%, and the UV254 removal rate increases from 4.29% to 34.29,When the dosage was increased to 80 mg / L,turbidity,UV254 removal rates decreased slowly,color removal rate increase,it is because the PFS electric neutralization, which is conducive to the formation and growth of flocs; when the dosage of PFS is small, which can not effectively adsorb more particles in Pi River water.With the increase of PFS dosage, the adsorption sites gradually increase,so the flocculation efficiency Gradually increased,In conclusion, when the dosage of PFS is 70mg / L,the flocculation effect is the best
The optimal dosage of PFS is 70mg.L, for UV254 removal, the optimal pH value range is not neutral. It has good effect on removing turbidity and chroma by adding PFS,but it is normal to UV254,the removal rate is not exceed 50%,When the dosage of PFS increases from 30 mg / L to 70 mg / L, the removal trend of the turbidity and chroma is similar to that of UV254, more than 70 mg / L,turbidity,UV254 removal rates decreased slowly,color removal rate increase

Summary

Introduction

The Pi River main canal is a national strategic high quality water source and an important drinking water source in Lu'an and Hefei,which is related to the drinking water safety of more than 5 million people in the two cities[1].,with the acceleration of urbanization construction and the rise of the central economy,in recent years the water quality has shown slow downward trend.At present, most of the water supply plants in Pi River basin generally use PAC as coagulant.The enhanced coagulation technology is used to treat the Pi River water, which has good removal effect on turbidity and chroma,but it willlead to increased aluminum content in water,the body's excessive intake of aluminum may cause severe calcium deficiency, and the body's high residual aluminum may cause Parkinson's disease, Alzheimer's disease, hair loss and other diseases[2]. Polymerized ferric sulfate (PFS) is widely used in the field of water treatment due to its advantages of short coagulation reaction time, low price, wide range of pH application,less residual iron ions and good dehydration performance of hydrolysate[3].,it is discussed the effect of coagulation treatment by the PFS coagulant for the PI river water,which are used turbidity,chroma,UV254 as the main measurement indicators.

Results

Conclusion