镁改性生物炭吸附水和畜禽养殖废水中氮磷的研究  

Adsorption of nitrogen and phosphorus in water and livestock and poultry wastewater by magnesium-modified biochar

作　　者：唐鑫磊 邢涛[2] 夏金雨[3] 周正伟[1] TANG Xinlei;XING Tao;XIA Jinyu;ZHOU Zhengwei(School of Environmental Science and Engineering,Changzhou University,Changzhou 213164,China;Guangzhou Institute of Energy Conversion,Chinese Academy of Sciences,Guangzhou 510640,China;Suzhou Environmental Sanitation Administration Agency,Suzhou 215007,China)

机构地区：[1]常州大学环境科学与工程学院,江苏常州213164 [2]中国科学院广州能源研究所,广东广州510640 [3]苏州市环境卫生管理处,江苏苏州215007

出　　处：《工业水处理》2023年第9期144-152,共9页Industrial Water Treatment

摘　　要：畜禽养殖废水中含高浓度的氮、磷污染物,随意排放容易导致水体富营养化。以松木生物炭为原料,氯化镁为改性剂,制备镁改性松木生物炭(MgBC),采用SEM-EDS、XRD、FT-IR和BET对改性前后的材料进行表征。在确定适宜溶液pH的基础上,研究了MgBC对氮和磷的吸附动力学和吸附等温线,并进一步探究MgBC对实际畜禽养殖废水中氮、磷、COD的去除效果。结果表明,在中性条件下,改性剂浓度为2 mol/L时制备的MgBC对氮和磷的吸附效果较好,对氮和磷的理论平衡吸附量分别为24.70 mg/g和97.52 mg/g;准二级动力学模型可以更好地描述镁改性松木生物炭在模拟废水中的吸附过程,Langmuir方程的拟合程度更高;对实际畜禽养殖废水中氮、磷、COD的去除率分别为10.04%、74.82%、37.91%。The uncontrolled discharge of high concentrations of nitrogen and phosphorus in livestock and poultry wastewater will easily lead to eutrophication of surface waters.A type of magnesium-modified pine biochar(MgBC)was prepared by using pine biochar as raw material and magnesium chloride as modifier.The materials before and after modification were characterized by SEM-EDS,XRD,FT-IR and BET.After the appropriate pH was determined,the adsorption kinetics and adsorption isotherms of MgBC on nitrogen and phosphorus were studied,and the removal performance of MgBC on nitrogen,phosphorus and COD in actual livestock and poultry breeding wastewater was further explored.The results showed that under neutral conditions,the MgBC prepared with 2 mol/L MgCl_(2) as modifier exhibited better adsorption effect on nitrogen and phosphorus,and the theoretical equilibrium adsorption capacities for nitrogen and phosphorus were 24.70 mg/g and 97.52 mg/g,respectively.The pseudosecond-order kinetic model could better describe the adsorption process of magnesium-modified pine biochar in simulated wastewater,and the Langmuir equation fitted the adsorption isotherm better.In addition,the removal rates of nitrogen,phosphorus and COD in the actual livestock and poultry breeding wastewater were 10.04%,74.82%and 37.91%.

关 键 词：松木生物炭 镁改性 氮磷吸附 畜禽养殖废水 

分 类 号：X703.1[环境科学与工程—环境工程]