Filter water purification demonstration aluminum chloride PAC removal of water in the role of aluminum is obvious? Filter water purification demonstration aluminum chloride PAC removal of water in the role of aluminum is obvious? Most domestic water treatment plants use PAC as a flocculant, and many water treatment plants increase the amount of flocculants in order to reduce the turbidity of the pre-filtration water, which increases the aluminum content in effluent plants. Poly aluminum chloride removal of water with aluminum ions have special effects, let's specific introduction. Drinking water sources in Zhuhai City are mainly taken from the mainstream of the Xijiang River and the front hills and watercourses. The content of aluminum in water is always up to 1.52 mg / L when the highest level is high. During the process of reproduction, it was found that the aluminum content of the ex-factory water did not exceed the standard when the aluminum ion content in the raw water was relatively high, while the aluminum ion content in the ex-factory water of the individual water plants sometimes exceeded the standard when the aluminum ion content in the raw water was low. This caused the technicians to pay attention to the aluminum effect and the dosing range of the PACF, and carried out relevant research work for this. 1, test methods Equipment and equipment: Six mixer, a small high-0.5m sand column, turbidimeter and atomic absorption spectrophotometer. Reagents: Aluminum standard solution 1.00mg / L; Poly aluminum ferric chloride solution: 2.0mg / L (Poly aluminum ferric chloride solid I Yu Sheng water purification material company, 29% aluminum content, iron content of 3%) . Results and discussion: The test water was taken from Nanshawan Pumping Station, with a turbidity of 4.84 NTU, a pH value of 7.4 and an aluminum ion content of 0.10 mg / L. In each of the eight beakers were added 1000ml of water samples, and then were added different amounts of aluminum standard solution 2ml, PAC ferric chloride solution, the first rapid mixing (270r / min), at medium speed stirring (70r / min) 5min, After 10min, take the supernatant (2/3 place) clear liquid 100ml, and the remaining supernatant was filtered through a filter column, respectively, and then take the filtrate 100ml, and then measured turbidity, aluminum content. After the test shows that, due to lower water turbidity, so the formation of alum less and loose and not easy to sink, which makes the water before the filter turbidity, the remaining aluminum are higher, but the filtered water turbidity, aluminum content This shows that the filter column can effectively trap the alum that did not sink when it settles. Before the mountain and rice raw water test: After taking the rain before the Zhuhai Qian River water (turbidity of 61.7NTU, PH value of 7.1, aluminum ion content of 0.12mg / L) tested according to the method described above, due to an increase in suspended solids, so the particles The probability of collision between the two is greatly increased, which makes the alum flower large and dense with good coagulation effect. Therefore, the raw water with lower aluminum content and turbidity before filtration can be stabilized at about 0.6 mg / L after filtration (compared with low turbidity raw water The equivalent). The effect of adding aluminum ferric chloride on aluminum removal: The test water is still mountain river water after rain, but the aluminum content is increased to 1.02mg / L and 2.02mg / L, after adding different amount of polyaluminum chloride According to the above method, it can be seen that when the polyaluminum chloride dosage is about 30 mg / L, the aluminum content in the filtered water may exceed the standard. Based on the above three experiments, we think that the effect of PAC-Fe in removing aluminum ions in water is obvious, and the dosage should be controlled within 15mg / L, and the less the better, the better the water quality can reach the standard . Poly aluminum ferric chloride is reasonably used to remove aluminum ions in the water so that the aluminum ion content in the effluent meets the requirements of the national drinking water standard. The dosage should be the water quality of the water plant may be, under the premise of ensuring the quality of the factory water should be reduced dosage. If the original water color is high, more algae can be used together with other ferric chloride, which can ensure the treatment effect, but also reduce the amount of PAC. This article by the filter water http://www.gyzhenyu.com finishing release, if reproduced, please indicate the future!