环境工程学报2017，Vol.11Issue(8)：4489-4496,8.DOI:10.12030/j.cjee.201607227
聚乙烯醇包埋水化硅酸钙粉末制备薄片状材料用于处理含磷废水
Preparation of PVA entrapped CSH adsorbent sheets and used for treatment of phosphorus wastewater
摘要
Abstract
Planar calcium silicate hydrate (CSH) adsorbents were prepared using the polyvinyl alcohol (PVA) embedding method, with sodium nitrate as crosslinking agent, to solve practical problems of powder CSH.These include easy loss, tendency for plugging, and so on;to avoid the negative influence of the adsorption properties of CSH.The embedded CSH adsorbent (PVA-CSH) was characterized using SEM and FTIR.The adsorption of phosphorus from aqueous solution onto CSH and PVA-CSH was investigated using a static batch experiment.The practical application of CSH and PVA-CSH was researched by continuous experiment.The results showed that PVA-CSH had a porous net structure, and that the groups of CSH were unchanged before and after embedding.Adding PVA had some impact on the phosphorus adsorption rate, but the equilibrium adsorption capacity was unaffected.The adsorption fitted well with the pseudo-second-order kinetic model.The fitted isotherm equation for the adsorption accorded with the Langmuir adsorption model.The results of flowing column experiments showed that under the same conditions, when the effluent concentration of phosphorus exceeded 0.5 mg · L-1, the run time of filter columns of CSH and PVA-CSH were both about seven days.For the filter column with PVA-CSH, the effluent concentration of COD was always ＜ 10 mg · L-1, the effluent concentration of NO3--N was always ＜ 2 mg · L-1, and the effluent turbidity was close to 0 NTU.These were significantly better than those with CSH powder.关键词
除磷/水化硅酸钙/聚乙烯醇/包埋固定Key words
phosphate removal/calcium silicate hydrate/polyvinyl alcohol/embed分类
资源环境引用本文复制引用
王涵,吉芳英,范剑平,刘大伟,吴安琪,张千..聚乙烯醇包埋水化硅酸钙粉末制备薄片状材料用于处理含磷废水[J].环境工程学报,2017,11(8):4489-4496,8.基金项目
国家水体污染控制与治理重大科技专项(2013ZX07314-001-002) （2013ZX07314-001-002）
高等学校学科创新引智计划项目(B13041) （B13041）
