改性火山石对水中氨氮的去除效果分析

Analysis of the Removal Effect of Modified Volcanic Rocks on Ammonia Nitrogen in Water

湖泊富营养化已成为普遍关注的环境卫生问题之一,其中内源性氨氮污染是治理富营养化问题的关键。颗粒型天然火山石常用于内源性氮、氨废水的吸附处理,但去除效果不理想。因此,选择利于脱水分离处理的火山石作为基础材料,先后使用HCl和NaOH两种溶液以化学改性的方式处理火山石,以提高其吸附性能,从而有效去除水体中的氨氮。从表征和实验测试两方面测试改性后火山石的氨氮吸附效果。表征观测结果显示:改性后的火山石表面形成更多的吸附位点和更加复杂的孔隙结构,使得火山石的比表面积增加,活性位点数量增加,从而提高了火山石对溶液中氨氮的吸附能力;从改性火山石吸附能力、吸附等温线、溶液初始pH值和投加量对吸附性能的影响4个方面进行实验测试。实验测试结果表明:拟合后改性火山石吸附剂吸附水体中氨氮污染物的过程属于准二级吸附;且改性火山石最大吸附容量是天然火山石最大吸附容量的2.29倍,即这种改性火山石吸附氨氮污染物吸附能力较好,可以有效去除水中的氨氮污染。

Eutrophication of lakes has become one of the environmental health issues of widespread concern,among which endogenous ammonia nitrogen pollution is the key to control eutrophication.Granular natural volcanic rocks are often used for the adsorption treatment of endogenous nitrogen and ammonia wastewater,but the adsorption removal effect is not ideal.Therefore,volcanic rock that is conducive to dehydration and separation treatment is selected as the basic material,and two solutions,HCl and NaOH,are used to chemically modify volcanic rock to improve its adsorption performance and effectively remove ammonia nitrogen from water.Test the ammonia nitrogen adsorption effect of modified volcanic rocks from two aspects:characterization and experimental testing.The characterization observation results show that the modified volcanic rock surface forms more adsorption sites and more complex pore structures,which increases the specific surface area and the number of active sites of volcanic rock,thereby improving its adsorption capacity for ammonia nitrogen in solution.Experimental tests were conducted on the effects of modified volcanic stone adsorption capacity,adsorption isotherms,initial solution pH,and dosage on adsorption performance.The experimental test results show that the process of modified volcanic rock adsorbent adsorbing ammonia nitrogen pollutants in water after fitting belongs to quasi second order adsorption;And the maximum adsorption capacity of modified volcanic rock is 2.29 times that of natural volcanic rock,indicating that modified volcanic rock has a good adsorption capacity for ammonia nitrogen pollutants and can effectively remove ammonia nitrogen pollution from water.