摘要
为研究探讨出一种成本低、适用于农村生活污水处理的人工湿地填料负载铁膜方法,通过室内小试比较了石灰石砂砾、普通河沙砂砾2种材料,以及FeCl3溶液、FeSO4溶液、Fe(OH)3胶体溶液3种含铁溶液,并比较了不同的工艺条件,包括4种加液方式:载体浸泡在溶液中不捞出、浸泡2 h后捞出、浸泡1 min后立即捞出和喷淋,3种干燥方式:105℃烘干、太阳晒干和室内自然晾干;同时构建了铁膜石灰石砂砾小型人工湿地,考察了其实际运行效果。试验优选出的负载铁膜方法为:石灰石砂砾浸泡在浓度为1.5 mol·L-1的FeSO4溶液中,使石灰石砂砾与溶液充分接触1 min后捞出,再将捞出后的石灰石砂砾室内通风自然晾干。铁膜石灰石砂砾对生活污水总磷的静态吸附去除率从普通石灰石砂砾的22.7%提高到80.6%;将其应用于小型人工湿地,总磷去除率比普通石灰石砂砾湿地提高了10%~15%。
In order to obtain a low-cost iron coating method suitable to constructed wetland substrate for rural domestic sewage treatment,this study compared limestone and river sand as substrates for Fe-coating in laboratory experiments,using three types of Fe-containing solutions:FeCl3,FeSO4 and Fe(OH)3 colloids.Four methods were employed for the addition of these Fe solutions:soaking the substrate in the solution without re-collecting,re-collecting after soaking for 2 h,re-collecting immediately after soaking for 1 min,and spraying Fe solutions onto the substrate.Three drying methods,drying at 105℃,drying under sun-right,and natural drying under roof,were compared.A small constructed wetland filled with Fe-coated limestone was set-up and operated to verify its effectiveness.The method of Fe coating as per the laboratory experiments is as follows:The limestone is immersed in a 1.5 mol·L-1 FeSO4 solution,re-collect the limestone after the full contact with the FeSO4 solution for 1 min,and the Fe-containing liquid film on the limestone dried naturally under roof.The batch adsorption test showed that the removal rate of total P from domestic sewage by limestones was improved from 22.7%to 80.6%for the Feloaded limestone.The removal rate of total P by constructed wetland with Fe-coated limestone was increased by 10%to 15%compared with the ordinary limestone wetland.
作者
施佳诚
陈灿明
高婷
卫泽斌
吴启堂
SHI Jia-cheng;CHEN Can-ming;GAO Ting;WEI Ze-bin;WU Qi-tang(College of Natural Resources and Environment,South China Agricultural University,Guangzhou 510642,China)
出处
《农业环境科学学报》
CAS
CSCD
北大核心
2020年第9期1993-2000,共8页
Journal of Agro-Environment Science
基金
广东省水利科技创新项目(2017-29)。
关键词
人工湿地
总磷
石灰石
负载铁膜
constructed wetland
total P
limestone
iron coating
