Abstract
Through a static beaker test, it was analyzed the effect on the removal of turbidity and UV254 by poly-aluminum chloride(PAC) under different dosages and pH values in the PI river,and discussed the relationship between the dosage of PAC and residual aluminum.The results showed that it has good effect on removing turbidity by adding PAC,but it was normal to UV254,the removal rate was not exceed sixty percent, with the increase of PAC dosage, the removal trend of the turbidity after precipitation was similar to that of UV254, while residual aluminum first decreased and then slowly increased.For turbidity removal, the optimal dosage of PAC was 8.5 mg / L, and the optimal pH value range was 7.2-8.5. For removal of UV254, the optimal pH value range was 6.5-7.2. The best experimental conditions for coagulation are PAC dosage of 8.5 mg/L, raw water pH value of 7.2.
Highlights
IntroductionThe removal of natural organic matter are mainly:enhanced coagulation, granular activated carbon adsorption and membrane filtration, in which the enhanced coagulation is recommended by the U.S Environmental Protection Agency (USEPA) in water control[2].The poly aluminum chloride (PAC) is the most extensively used coagulant for water purification and eventually in waste water treatment plants throughout the world [3].In order to improve the aggregating capacity of PAC, several efforts have been made during the recent few years, towards the incorporation of silica in its structure.Hasegawa et al.[4]noticed that by introducing metal ions into polymerized silicic acid solution, the molecular weight of the product was increased and the corresponding stability and coagulation performance were further improved
The PI river is the source of drinking water for a water plant,in which the average of turbidity is less than 10 NTU,and organic pollutants are mainly natural organic matters(NOM),including humus, microbial secretions, dissolved plant tissue and animal wastes[1]
The removal of natural organic matter are mainly:enhanced coagulation, granular activated carbon adsorption and membrane filtration, in which the enhanced coagulation is recommended by the U.S Environmental Protection Agency (USEPA) in water control[2].The poly aluminum chloride (PAC) is the most extensively used coagulant for water purification and eventually in waste water treatment plants throughout the world [3].In order to improve the aggregating capacity of PAC, several efforts have been made during the recent few years, towards the incorporation of silica in its structure.Hasegawa et al.[4]noticed that by introducing metal ions into polymerized silicic acid solution, the molecular weight of the product was increased and the corresponding stability and coagulation performance were further improved
Summary
The removal of natural organic matter are mainly:enhanced coagulation, granular activated carbon adsorption and membrane filtration, in which the enhanced coagulation is recommended by the U.S Environmental Protection Agency (USEPA) in water control[2].The poly aluminum chloride (PAC) is the most extensively used coagulant for water purification and eventually in waste water treatment plants throughout the world [3].In order to improve the aggregating capacity of PAC, several efforts have been made during the recent few years, towards the incorporation of silica in its structure.Hasegawa et al.[4]noticed that by introducing metal ions into polymerized silicic acid solution, the molecular weight of the product was increased and the corresponding stability and coagulation performance were further improved For many years, it is used PAC as coagulant in a water plant.Due to less impurities in low turbidity source water, there is less chance of condensation and collision, and it is not easy to form flocs, overdosed PAC can increase floc Formation, but it will lead 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 [5].UV254 is an index to evaluate organic pollutants in water in 1970s. It is provided a certain reference to treat low turbidity and high organic water in a water plant
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