环境保护科学2025，Vol.51Issue(3)：50-62,13.DOI:10.16803/j.cnki.issn.1004-6216.202404035
改性污泥质生物炭对污水中氮磷的吸附性能及机理研究
Adsorption performance and mechanism of modified sludge biochar on nitrogen and phosphorus in wastewater
摘要
Abstract
Modified sludge-based biochar(Ca/Mg SBC)was prepared using residual sludge and bimetallic oxides,and its adsorption performance and mechanism for nitrogen and phosphorus were investigated.The results showed that the surface roughness of the modified biochar was significantly increased,effectively improving the specific surface area of the biochar,and Ca and Mg elements were successfully loaded onto the original biochar.The removal effect of Ca/Mg SBC on phosphate was better than that on ammonia nitrogen.The initial solution concentration had a great influence on the co-adsorption of nitrogen and phosphorus by Ca/Mg SBC,and the presence of phosphate promoted the adsorption of ammonia nitrogen.The adsorption of nitrogen and phosphorus by Ca/Mg SBC conformed to the Langmuir adsorption isotherm model and the pseudo-second-order kinetic model,indicating that the adsorption process was monolayer and dominated by chemical adsorption.Adsorption thermodynamics studies showed that the adsorption of nitrogen and phosphorus by Ca/Mg SBC was a spontaneous and endothermic reaction.The mechanisms of ammonia nitrogen removal by Ca/Mg SBC included physical adsorption,electrostatic adsorption,ion exchange,and surface complexation.The adsorption mechanisms for phosphate included physical adsorption,electrostatic adsorption,surface complexation,and precipitation,and there was also a struvite reaction,which enhanced the adsorption of nitrogen and phosphorus by the biochar.关键词
剩余污泥/生物炭/氮磷/吸附Key words
residual sludge/biochar/nitrogen and phosphorus/adsorption分类
资源环境引用本文复制引用
陈玲珑,方芳,张佳玲,赵雨,操家顺,谢文明..改性污泥质生物炭对污水中氮磷的吸附性能及机理研究[J].环境保护科学,2025,51(3):50-62,13.基金项目
国家自然科学基金(52170032) （52170032）
国家重点研发计划(2022YFA1205603) （2022YFA1205603）
