污水污泥中的磷回收研究
[Abstract]:With the rapid development of China's economy, the technology of recycling phosphorus has been widely concerned by people. As the essential element of human existence, phosphorus is in the state of one-way circulation in nature, and because of the excessive use of the phosphorus, the phosphorus resource in nature is continuously reduced and it is difficult to regenerate, however, many of the phosphorus is present in the sewage, and the sewage is discharged into the water to form the eutrophic water. If the technology of recovering phosphorus from the sewage sludge is properly selected, the water pollution can be reduced, the problem of the shortage of the phosphorus in the natural world can be made up, and the method is of great significance in the real life. The main research of this paper is to recover the phosphorus by adsorption. First, the research object of the experiment is the corn straw, which is modified and carbonized, and finally the adsorbent with good adsorption performance is prepared, and the optimal conditions for preparing the optimal modified carbonized corn straw adsorbent are obtained by researching the efficiency of the phosphate radical removal in the solution. The corn straw was modified with different chemical modifier, and it was found that the removal effect of the phosphate radical in the solution was the best by using zinc chloride as a modifier to modify the corn straw. The effects of the conditions such as the concentration of the modifier, the impregnation ratio, the activation time and the activation temperature on the adsorption efficiency and yield of the adsorbent were analyzed by using zinc chloride as the corn straw modifier. The experiment data show that the removal rate of phosphate radical in the solution is 99.52% and the yield is 21.75% under the condition that the concentration of the modifier is 50 g/ L, the impregnation ratio is 2:1, the activation time is 2 h and the activation temperature is 400 DEG C. Secondly, the optimal modified carbonized corn straw adsorbent was used to adsorb the phosphate in the solution, and the addition of the adsorbent and the pH value were analyzed by the equilibrium adsorption method. The effect of the reaction time and the initial concentration of the phosphate in the solution on the removal of phosphorus from the modified carbonized corn straw adsorbent was studied. The experimental data show that when the concentration of the phosphorus in the solution is 50 mg/ L and the addition amount of the adsorbent is 0.2 g, the removal rate of the phosphate in the solution is the best, and 99.52% can be achieved, and the adsorption process is relatively rapid, the reaction is 20 min, and the adsorption process has been basically completed. and when the pH value of the solution is 8, the removal rate of the adsorbent to the phosphate radical is 99.52%; when the pH value of the solution is more than 8, The removal rate of the adsorbent to the phosphate has a tendency to decrease slowly, so that the p-H of the solution is adjusted to a weak base, which is favorable for the recovery of the phosphorus by the adsorbent. And simultaneously adding different concentration of the interference substance into the solution, and analyzing the influence of the interference on the phosphate radical in the adsorption solution of the modified carbonized corn straw adsorbent in the solution. The results show that when the solution contains COD and NH4 + with different concentration, the effect of phosphorus in the recovery solution of the adsorbent is very small. In the end, the adsorption process of the modified carbonized corn straw adsorbent in the solution at different temperatures is described in detail by the Langmuir and Freundlich adsorption isothermal model. The results show that the reaction temperature has little influence on the adsorption capacity of the adsorbent. The adsorption kinetics model shows that the process of the phosphorus in the adsorption solution of the modified carbonized corn straw adsorbent is closer to the pseudo-secondary dynamic model. In summary, the problem of phosphorus resource shortage and large amount of phosphorus in sewage sludge should be paid more and more attention. The technology of recovering phosphorus from sewage sludge has been perfected with people's research. The method for preparing the adsorbent by using the corn straw not only realizes the utilization of the waste, but also can effectively recover the phosphorus. Therefore, the contents of this paper provide a reference for the recovery of phosphorus in sewage sludge, and it is of great significance to solve the problem of the shortage of phosphorus resources.
【学位授予单位】:吉林建筑大学
【学位级别】:硕士
【学位授予年份】:2017
【分类号】:X703
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