蒸压加气混凝土对废水中磷的吸附性能研究  

Study on the Adsorption Properties of Phosphorus in Wastewater by Autoclaved Aerate Concrete

作　　者：郝晓晖[1] 王砚[2] 胡荣桂[2] HAO Xiaohui;WANG Yan;HU Ronggui(Department of Chemical Engineering and Architecture Hohhot Vocational College,Hohhot Inner Mongolia 010070;College of Resources and Environment Huazhong Agricultural University,Wuhan Hubei 430070)

机构地区：[1]呼和浩特职业学院化工与建筑系,内蒙古呼和浩特010070 [2]华中农业大学资源与环境学院,湖北武汉430070

出　　处：《环境卫生工程》2023年第3期44-49,54,共7页Environmental Sanitation Engineering

基　　金：武汉市科技计划项目(2020020601012284);内蒙古自治区高等学校科学研究项目(NJ2Y19295)。

摘　　要：吸附法是去除废水中磷元素较为经济有效的手段之一。选取城市建筑垃圾中呈多孔状的蒸压加气混凝土(AAC)砌块作为研究对象,采用静态吸附的试验方法,研究AAC对废水中磷的吸附性能,并利用Langmiur和Freundlich吸附模型拟合探讨了AAC的吸附机制。研究表明:随着AAC吸附剂浓度的增加,对水中磷的去除率也在增加,当吸附剂浓度为10 g/L时,AAC对磷的去除率已达93.61%;同吸附剂剂量下,随着接触时间的延长,AAC对磷的去除率急剧上升,8 h后即可达到平衡,去除率均在95%以上;磷的最大吸附量与磷的初始浓度皆呈显著正相关;不同pH条件下,磷的吸附量顺序为:pH=9>pH=5>pH=7;Langmuir和Freundlich的等温吸附拟合结果表明AAC对磷的去除主要以表面的静电吸附和化学吸附为主。Adsorption is one of the attractive approaches of phosphorus removal in waste effluents.In this study,the autoclaved aerate concrete(AAC)from urban construction and demolition debris was selected as the research object,and the static adsorption experimental method was adopted to study the AAC adsorption performance of phosphorus from wastewater.And the adsorption mechanism of AAC was explored by using Langmiur and Freundlich adsorption model fitting.The results showed that with the increased of AAC concentration,the removal rate of phosphorus in the water was also increased.When the concentration of the adsorbent was 10 g/L,the removal rate of phosphorus by AAC had reached 93.61%.At the same dose of the adsorbent,the removal percentage of phosphate by AAC was rapidly increased over time,and reached equilibrium after 8 hours.The removal rate of phosphorus was all above 95%.The maximum phosphorus adsorption amount was positively correlated with the initial concentration of phosphorus.Under different pH,the order of phosphorus adsorption capacity was pH=9>pH=5>pH=7.The isothermal adsorption fitting results of Langmuir and Freundlich showed that the removal of phosphorus by AAC was mainly caused by electrostatic adsorption and chemical adsorption on the surface.

关 键 词：蒸压加气混凝土 磷 静电吸附 化学吸附 

分 类 号：X799.1[环境科学与工程—环境工程] X703