本文選題：聚合硫酸鐵 + 鈣基改性��； 參考：《湖北工業(yè)大學》2017年碩士論文

【摘要】：本論文探討了用雙氧水氧化制備聚合硫酸鐵(PFS)并用鈣鹽對PFS進行改性的實驗過程。考察了硫酸用量、過氧化氫用量、反應溫度和反應時間等因素對聚合硫酸鐵主要成分(全鐵含量、Fe2+含量及鹽基度)指標的影響。同時,在此基礎上,對上述合成的質量優(yōu)良的PFS進行鈣鹽改性,并采用響應曲線面優(yōu)化設計法,創(chuàng)建Box-Behnken數(shù)學模型,考察Ca/Fe摩爾比、反應溫度和時間對合成產(chǎn)物成分(全鐵含量、Fe2+含量及鹽基度)的影響,從而得到質量較好的鈣基聚合硫酸鐵(CaPFS)。借助傅立葉變換紅外光譜圖、掃描電鏡照片觀察了PFS及CaPFS的結構與形貌,并進一步考察了本論文合成聚合硫酸鐵(Z-PFS)、鈣基聚合硫酸鐵(CaPFS)和市場常用的聚合硫酸鐵(S-PFS)對富磷底泥的固磷脫水效果。通過制備PFS、CaPFS的實驗過程研究,得到以下結論:1.實驗通過對硫酸、過氧化氫、反應溫度和時間四個因素優(yōu)化,確定:n[SO42-]/n[Fe]T=1.3,n[H2O2]/n[Fe]T=0.70,反應溫度和時間分別為50℃、5h,得到產(chǎn)品全鐵含量為12.58%,Fe2+含量為0.002%,鹽基度為13.84%,為最佳質量產(chǎn)品。2.實驗采取響應曲面設計并按照現(xiàn)實條件獲得最好合成鈣基聚合硫酸鐵條件:反應溫度、時間和Ca/Fe摩爾比分別為62℃、7h、0.05。所得產(chǎn)品全鐵量和鹽基度平均值在13.82%和17.95%。經(jīng)實驗驗證,全鐵量和鹽基度測得值與模型預測值偏差僅為0.84%和0.47%。同時,實驗借助傅立葉變換紅外光譜、與SEM分析表征手段觀察了CaPFS的結構與形貌,顯示制備的CaPFS為鐵與羥基橋聯(lián)的聚鐵類產(chǎn)物。3.與市售的PFS比較發(fā)現(xiàn):在投加量為4.78μg/g時,CaPFS和市售的PFS調理后的底泥,比阻值均達到最低,此時n(Ca)/n(Fe)=0.05的CaPFS比阻值下降到0.40×1012m/kg,市售的PFS比阻下降至0.96×1012m/kg;同時n(Ca)/n(Fe)=0.05的CaPFS處理后底泥上清液磷濃度為0.08mg/L,沉泥濾液中磷濃度為0.44 mg/L,均低于被市售的PFS處理的(0.23mg/L,0.59 mg/L),對應的94.84%和87.34%的磷被固持于底泥之中。以上顯示CaPFS提升底泥脫水能力及固磷效能優(yōu)于市售的PFS。
[Abstract]:In this paper, the experimental process of PFS modified by calcium salt was studied. The effects of the amount of sulfuric acid, hydrogen peroxide, reaction temperature and reaction time on the main components (total iron content, Fe _ 2 content and basicity) of polyferric sulfate were investigated. At the same time, on the basis of this, the PFS with excellent quality was modified by calcium salt, and the Box-Behnken mathematical model was established by using the optimum design method of response curve surface, and the molar ratio of Ca/Fe was investigated. The effect of reaction temperature and time on the composition of the synthesized product (total iron content, Fe _ 2 content and basicity) was investigated, and a better quality calcium polyferric sulfate (CaPFS) was obtained. The structure and morphology of PFS and CaPFS were observed by Fourier transform infrared spectroscopy (FTIR) and scanning electron microscope (SEM). The dewatering effects of synthetic polyferric sulfate Z-PFS, calcium based polyferric sulfate (CaPFS) and polymeric ferric sulfate S-PFS on phosphorus-rich sediment were further investigated. The experimental process of preparing PFS- CaPFS was studied, and the following conclusions were obtained: 1. 1. Through the optimization of sulfuric acid, hydrogen peroxide, reaction temperature and time, it was determined that: n [so _ 42-] / n [Fe] _ T _ (3) N [H2O2] / n [Fe] T _ (0. 70), reaction temperature and time were 50 鈩，

本文編號：1930874