Abstract
Using poly-aluminum chloride (PAC) and poly-ferric sulfate (PFS) as coagulants, the effects of the dosage of PAC and PFS on the removal of turbidity, chromaticity and UV254* in water were investigated by using the method of enhanced coagulation. The results show that when the raw water is neutral and the turbidity is less than 20NTU, and the pH value does not decrease much after coagulation and sedimentation, PAC and PFS are separately added to 7.5mg/l, 35mg/l. The removal rate of turbidity and chromaticity in the water sample can reach 83.75% and 48.47%, respectively, but the removal rate of UV254* is less than 30%, the mass ratio of PAC to PFS is 1:1 to 6:1, the removal efficiency of turbidity and Chroma increased by about 10%, but the removal efficiency of UV254* did not change or even decreased, both PFS and PAC can effectively remove the turbidity and Chroma in the micro polluted Pi River, but the removal effect of UV254* is not good, and the removal effect of PAC is better than PFS.
Highlights
Introduction he PiRiver 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
With the acceleration of urbanization construction and the rise of the central economy, in recent years the water quality has shown slow downward trend in some river sections [1].At present, most of the water supply plants in Pi River basin generally use poly-aluminum chloride (PAC) coagulant, which has good removal effect on turbidity and Chroma, but the removal effect of DOM is not ideal.Compared with the low toxicity of aluminum flocculant, iron flocculant has many advantages such as Polymerized ferric sulfate (PFS), which 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[2]
The results provide a feasible way for Pi River Basin water production enterprises to cope with the continuous improvement of water quality, and lay a foundation for the study of coagulation mechanism of PAC and PFS
Summary
Instruments: 2100P turbidimeter, HACH company; WGZ200 colorimeter, Shanghai Xinrui Instrument Co., Ltd.; T6 new century UV spectrophotometer, Beijing Puxi General Instrument Co., Ltd.; MY3000-6F intelligent coagulation test mixer, Wuhan Meiyu Instrument Co.,Ltd.; portable pH meter, Taizhou Zhengda science and education equipment factory; FK-H3 digital display constant temperature magnetic stirrer, Fangke instrument (Changzhou) Co., Ltd.; FA2204N electronic balance, Shanghai Qinghai Instrument Co., Ltd. Reagents: polymerized ferric sulfate (PFS), iron content 18.5%, basicity 9.0-14, Pb 2.0-3.0, arsenic 0.0008, lead 0.0015, insoluble matter 0.5, Tianjin dingshengxin Chemical Co., Ltd.; poly (PAC), AL2O3 solid content 30%, pH (1% aqueous solution)3.5-5.0, Gongyi Zhongbang water purification material Co.,Ltd.; other reagents were analytical pure
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