喷雾干燥法在高盐有机废水中无机盐回收和有机质分解的应用研究  

Study on application of spray⁃drying method in inorganic salt recovery and organic matter decomposition in high salt organic wastewater

作　　者：袁尧森 李恩泽[1] 吕宏洲 宋一朋 杨成立 李娟娟 YUAN Yaosen;LI Enze;LÜHongzhou;SONG Yipeng;YANG Chengli;LI Juanjuan(Shanxi University,Taiyuan 030006,China;Shanxi Taiyuan Solid Waste Disposal Center(Co.,Ltd.),Taiyuan 030100,China;Shanxi Dadi Ecological Environment Technology Research Institute Co.,Ltd.,Taiyuan 030006,China)

机构地区：[1]山西大学,山西太原030006 [2]山西省太原固体废物处置中心(有限公司),山西太原030100 [3]山西大地生态环境技术研究院有限公司,山西太原030006

出　　处：《无机盐工业》2024年第8期83-91,共9页Inorganic Chemicals Industry

基　　金：国家自然科学基金面上项目(22278251);山西省黄河实验室科技攻关项目(YRL-202105);国家重点研发计划子课题项目(2022YFC3901304)。

摘　　要：采用喷雾干燥工艺,以高盐有机废水中溶解性有机污染物和无机盐为处理对象,重点研究了各温度下喷雾干燥工艺对无机盐的回收效果和对有机质的分解性能。通过扫描电子显微镜、傅里叶变换红外光谱仪及三维荧光光谱仪等对产物粉体进行分析。结果表明,雾化室加热蒸发过程中含羟基、羰基等亲水性基团的类腐殖酸大分子与脱水析出的Na Cl、Na_(2)SO_(4)等无机盐结合,形成开口空心球壳结构颗粒,粉体粒径集中分布在1.25~3.85μm。废水经喷雾干燥和旋风分离后得到白色粉末,经600℃焚烧,粉末中的难降解有机质可全部除尽,烧失率为6.23%;焚烧后的混盐经原子吸收光谱与X射线衍射分析表明,原始废水中含量较多的金属元素如Na^(+)、K^(+)等得到保留,可供进一步分盐后循环利用。在0.2 MPa、140℃的最佳工艺条件下,废水有机物分解转化率为93.1%,溶解性有机碳、氨氮、总氮、总磷等水体富营养化污染物的降解率在64.7%以上,无机盐总回收率达87.2%,为高盐废水综合处置与清洁利用提供了新思路。In this study,the spray‐drying process was used to treat dissolved organic pollutants and inorganic salts in high‐salt organic wastewater.The recovery of inorganic salts and the decomposition properties of organic matter at each tempera‐ture of the process were revealed.The analysis results of the product powder by SEM,FT-IR and 3D-EEMs showed that dur‐ing the heating and evaporation process in the atomization chamber,macromolecular refractory substances such as humic acid containing hydrophilic groups(hydroxyl and dcarbonyl groups)combined with inorganic salts such as NaCl and Na2SO_(4) to form open hollow spherical shell structure particles.The particle size of the powder was distributed between 1.25 and 3.85μm.After spray‐drying and cyclone separation,white powders were obtained from wastewater,which was burned at 600℃,all the refractory organic matter in it could be completely removed,and the burning loss rate was 6.23%.AAs and XRD analysis of the burned mixed salt showed that most of the metal elements such as Na+and K+in the original wastewater were reserved for further recycling after salt separation.Under the optimal process conditions(0.2 MPa+140℃),the decom‐position and transformation efficiency of organic matter was as high as 93.1%,and the degradation rate of eutrophication pollutants such as dissolved organic carbon,ammonia nitrogen,total nitrogen and total phosphorus in water was over 64.7%,the total recovery rate of inorganic salt was 87.2%,which provided a new idea for the comprehensive disposal and clean uti‐lization of high‐salt wastewater.

关 键 词：喷雾干燥法 高盐有机废水 有机质分解 无机盐回收 

分 类 号：X703[环境科学与工程—环境工程]