強化混凝與麥飯石吸附聯(lián)用處理低溫低濁水的試驗研究
[Abstract]:The treatment of low temperature and low turbidity water has always been a difficult problem in the process of water treatment in China, especially in the north of China, where the seasonal ammonia nitrogen and organic pollution are serious, which aggravate the difficulty of water treatment. In view of the poor treatment effect of low temperature and low turbidity water in northern China, it is very necessary to put forward an efficient, economical and environmental protection treatment technology to realize the effective removal of pollutants in low temperature and low turbidity water. This paper takes a park water in Fuxin as the research object, constructs the combination process of strengthening coagulation-Maifan stone adsorption to treat low temperature and low turbidity water, and organically combines the adsorption ability of Maifan stone with the optimum coagulation condition. The main advantages of this method are as follows: enhanced coagulation can improve the turbidity removal rate and expand the removal range of organic matter by improving coagulation conditions. This method is economical, convenient and effective in removing organic matter. In addition, Maifan stone has a large specific surface area. And the adsorption ability of ammonia nitrogen is strong. The combination of the two can realize the economic and efficient removal of turbidity, organic matter and ammonia nitrogen, and the effluent quality is better. Static test (beaker test) and dynamic test (dynamic column test) were used to study low-temperature and low-turbidity micro-polluted water. Firstly, the static single factor test is used to analyze the effect of each factor on coagulation effect, and the response surface model is constructed based on the single factor test. The response equation and interaction relation of PAFC dosing point were determined. Finally, the optimum coagulation conditions were determined according to the experimental results optimized by Design-Expert. Secondly, the coagulation test of low temperature and low turbidity water was carried out according to the optimum process parameters determined by static test. The removal efficiency of turbidity, ammonia nitrogen and COD was studied by using dynamic column of effluent after static 30min. The results showed that the conditions of hydraulic stirring were rapid agitation for 45s (350r/min), first-grade flocculation agitation 6min (90r/min), second-order flocculating agitating 9min (50r/min), setting time 30min, PAFC. When the dosage of PAM was 17.80 mg / L, 0.39 mg / L, and the point of PAM was -0.01, the removal rate of turbidity and ammonia nitrogen was 68.03% 10.92% and 30.2% respectively. The effect of modified Maifanite treated by Na2SO4 is better, the removal rate of ammonia nitrogen and COD is 96.57% 67.25 and 74.79, which can increase the removal rate of 39.7666.66% and 43.98%, and the quality of the effluent is better than that after coagulation. Through the above research, it is found that the combined use of enhanced coagulation and Mailanshi adsorption has a better removal effect on low temperature and low turbidity water. The effluent turbidity, ammonia nitrogen and pH can reach the drinking water standard and COD can reach the class II standard of centralized drinking water. It is proved that this method is feasible and effective in treating low temperature and low turbidity water.
【學位授予單位】:遼寧工程技術(shù)大學
【學位級別】:碩士
【學位授予年份】:2015
【分類號】:TU991.2
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