CIESC Journal ›› 2022, Vol. 73 ›› Issue (5): 2158-2173.DOI: 10.11949/0438-1157.20211693

• Energy and environmental engineering • Previous Articles     Next Articles

Study on the performance of biochar modified microspheres to remove inorganic phosphorus from chemical wastewater

Xiqiang ZHAO1(),Jian ZHANG1,Shuang SUN1,Wenlong WANG1,Yanpeng MAO1,Jing SUN1,Jinglong LIU2,Zhanlong SONG1()   

  1. 1.National Engineering Laboratory for Reducing Emissions from Coal Combustion, Engineering Research Center of Environmental Thermal Technology of Ministry of Education, Shandong Key Laboratory of Energy Carbon Reduction and Resource Utilization, School of Energy and Power Engineering, Shandong University, Jinan 250061, Shandong, China
    2.Shandong Electric Power Research Institute, Jinan 250001, Shandong, China
  • Received:2021-11-29 Revised:2022-01-27 Online:2022-05-24 Published:2022-05-05
  • Contact: Zhanlong SONG

生物质炭改性微球去除化工废水中无机磷的性能研究

赵希强1(),张健1,孙爽1,王文龙1,毛岩鹏1,孙静1,刘景龙2,宋占龙1()   

  1. 1.山东大学能源与动力工程学院,燃煤污染物减排国家工程实验室,环境热工技术教育部工程研究中心,山东省能源碳减排技术与资源化利用重点实验室,山东 济南 250061
    2.山东电力研究院,山东 济南 250001
  • 通讯作者: 宋占龙
  • 作者简介:赵希强(1981—),男,博士,副教授,zxq@sdu.edu.cn
  • 基金资助:
    山东省重点研发项目(2019GSF109091);山东电力研究院科技项目(ZY2020-06)

Abstract:

The discharge of chemical wastewater in China is huge, and the inorganic phosphorus contained in wastewater can lead to eutrophication of fresh water. Using sodium alginate from a wide range of sources and environment-friendly as the carrier, the bagasse biochar with high specific surface area prepared by one-step microwave pyrolysis and activated method as the additive, and ferric chloride as the cross-linking agent, three kinds of adsorbents (SA- Fe, SA-C-Fe and SA-C-Fe(C)) were prepared by the sol-gel method and the embedding method, and they were used to perform inorganic phosphorus removal experiments. The results showed that the adsorption process of the three materials conforms to the quasi-second-order kinetic model. The entire adsorption process of SA-Fe gel spheres and SA-C-Fe gel spheres conforms to the Langmuir isotherm model, and the maximum adsorption capacity of SA-Fe spheres and SA-C-Fe spheres to be 53.79 mg/g and 78.75 mg/g, respectively. The removal process of inorganic phosphorus by SA-C-Fe(C) gel spheres conforms to the Langmuir-Freundlich adsorption isotherm model. SA-C-Fe gel spheres have three adsorption mechanisms: ligand exchange, electrostatic attraction and surface deposition, with the highest adsorption capacity. After carbonization of SA-C-Fe(C) microspheres, the number of hydroxyl functional groups was reduced, the ligand exchange was weakened, and iron oxide deposits were formed, with the lowest adsorption capacity.

Key words: inorganic phosphorus, chemical wastewater, biochar, microwave pyrolysis, sodium alginate

摘要:

我国化工废水排放量巨大,其中含有的无机磷会导致淡水富营养化。选用来源广泛且环境友好的海藻酸钠为载体,微波一步热解活化法制得的高比表面积甘蔗渣生物炭为添加剂,氯化铁溶液为交联剂,通过溶胶凝胶法和包埋法制备了SA-Fe、SA-C-Fe和SA-C-Fe(C)三种吸附材料,并用其进行了无机磷的去除实验。研究发现三种材料的吸附过程均符合准二级动力学模型,其中SA-Fe和SA-C-Fe的吸附过程符合Langmuir等温模型,其对无机磷的最大吸附量分别为53.79 mg/g和78.75 mg/g;SA-C-Fe(C)对无机磷的吸附过程符合Langmuir-Freundlich等温吸附模型。SA-C-Fe材料吸附无机磷过程存在配体交换、静电吸引和表面沉积三种吸附机制,吸附容量最高;SA-C-Fe(C)微球经过碳化后,羟基官能团数量减少,配体交换作用减弱,且形成了铁氧化物沉积层,吸附容量最低。

关键词: 无机磷, 化工废水, 生物炭, 微波热解, 海藻酸钠

CLC Number: