本文關(guān)鍵詞：基于鐵形態(tài)分析的磁絮凝—膜過濾工藝研究　出處：《天津工業(yè)大學(xué)》2017年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 磁種 磁場 磁化時間 鐵形態(tài) 磁強化混凝 膜污染

【摘要】：磁絮凝膜過濾(Magnetically Enhanced Flocculation Ultrafiltration,MEF-UF)已成功的應(yīng)用于微污染水處理工藝。本文研究了不同的磁強化處理手段對混凝劑中鐵形態(tài)分布的影響,深入分析了磁強化混凝減緩膜污染的機理。通過分析磁絮凝膜過濾工藝中磁化后磁種對混凝劑鐵形態(tài)分布、混凝效果、絮體特性產(chǎn)生的影響,研究磁強化混凝減緩膜污染的機理。磁種在磁場強度H =0.2 T的磁場中經(jīng)過1到10 min不同時間的磁化后,其剩余磁場強度隨磁化時間先增大后減小,在磁化時間為4 min時,磁種剩余磁場強度最大,為0.92 mT。由于微米級磁種的磁滯效應(yīng),其磁化后的剩磁對混凝劑FeC13中鐵形態(tài)的分布產(chǎn)生影響,與混凝劑水解產(chǎn)物也存在明顯的關(guān)聯(lián)性。磁化后的磁種不僅提高了混凝劑中Fea和Feb的百分含量,尤其是Fea的含量,而且增加了待處理水體中的顆粒物含量。磁種磁化時間為4 min時,混凝劑中Fea與Feb含量之和達(dá)到92.9%。單體及低聚體鐵形態(tài)的增加,利于改善混凝效果,形成的絮體平均粒徑大,具有更高的強度以及更好的再生性能,形成的濾餅層可壓縮性差而疏松多孔,有助于減緩膜污染。本研究從磁化磁種干預(yù)混凝劑中鐵形態(tài)分布的角度對磁強化混凝減緩膜污染的機理作進(jìn)一步的分析。通過對比常規(guī)FeCl_3、磁化FeC13、FeCl_3與未磁化磁種復(fù)配以及FeCl_3與磁化磁種復(fù)配四種混凝劑之間的區(qū)別,研究磁場直接磁化混凝劑與磁化磁種對混凝劑中鐵形態(tài)分布的影響,對比磁場及磁種在磁絮凝膜過濾工藝中所起的作用。研究結(jié)果表明,磁場直接對混凝劑進(jìn)行磁化后Fea和Feb含量增加優(yōu)于磁化磁種對鐵形態(tài)分布的影響。傅里葉變換紅外譜圖(Fourier Transforrm Infrared Spectrometer,RT-IR)結(jié)果表明,添加磁種與磁場直接磁化均對對混凝劑中-Fe-與-O-或者-OH-結(jié)合的化學(xué)鍵產(chǎn)生影響。添加磁化磁種進(jìn)行的膜過濾,其跨膜壓差(Transmembrane pressure,TMP)增加速率最慢,而且被污染膜的zeta電位最低。這首先是因為磁化的磁種提高了混凝劑中單體及低聚體鐵形態(tài)含量,改變了混凝劑中化學(xué)鍵結(jié)合方式;再者是因為添加磁種增加了水體中顆粒物含量,提高混凝劑與污染物碰撞效率,磁種作為混凝的核心可以吸附更多的污染物。因此,在磁絮凝膜過濾工藝中,對磁種進(jìn)行磁化預(yù)處理后與混凝劑復(fù)配使用可達(dá)到有效減緩膜污染的目的。
[Abstract]:Magnetic flocculation membrane filtration (Magnetically Enhanced Flocculation Ultrafiltration, MEF-UF) has been successfully used in micro polluted water treatment process. The effects of different processing means of magnetic iron coagulant affect distribution, in-depth analysis of the mechanism of coagulation and membrane fouling. Through the analysis of magnetic flocculation magnetic enhanced membrane filtration process after magnetization the magnetic coagulant iron speciation, coagulation effect, influence of floc characteristics, the mechanism of coagulation and membrane fouling. The magnetic enhancement of magnetic field strength H =0.2 T in the magnetic field after 1 to 10 min in different time after magnetization, the magnetic field strength with the residual magnetization time increases first and then decreases. In time, the magnetization is 4 min, the maximum magnetic residual magnetic field strength is 0.92 mT., because the hysteresis effect of micron magnetic remanence, the magnetized impact on the distribution of iron coagulant FeC13 form, The existence and coagulant hydrolysis products have obvious relationship. The magnetized magnetic not only improves the content of mixed Fea and Feb retarder, especially Fea content, but also increase the particle concentration of the water to be treated. The magnetic magnetization time is 4 min, the content of Fea and Feb mixed agent the increase of 92.9%. and the monomer and oligomer of iron species, to improve the coagulation effect, the formation of floc mean diameter, with higher strength and better regeneration performance, cake layer compressibility and porosity, can reduce membrane fouling. This study from magnetized coagulant intervention iron morphology distribution of membrane fouling mechanism of coagulation enhancement on magnetic further analysis. By comparing the conventional FeCl_3, FeC13 magnetization, the difference between FeCl_3 and non magnetized compound and FeCl_3 and magnetized compound four kinds of coagulant, Study on the magnetic field directly magnetize coagulant and magnetization of iron coagulant affect distribution of magnetic field and magnetic contrast, which plays in the magnetic flocculation membrane filtration process. The results show that the magnetic field is better than that of directly increase the magnetization of magnetic iron form distribution of coagulant was Fea after magnetization and Feb content. Fourier transform infrared spectra (Fourier Transforrm Infrared Spectrometer, RT-IR). The results show that the addition of magnetic and magnetic field are directly impact on the magnetic coagulant -Fe- and -O- or -OH- combined with chemical bond formation. Membrane filtration in a magnetized add, the transmembrane pressure (Transmembrane, pressure, TMP) increase rate the slowest, and the contaminated membrane potential of zeta minimum. This is primarily because the magnetic magnetization improves coagulant in monomer and oligomer form of iron content, changed with mixed type chemical bonding agent; and Because of adding magnetic particles increased in water, improve the coagulant and pollutant collision efficiency, as the core of magnetic coagulation can adsorb more pollutants. Therefore, the magnetic flocculation membrane filtration process, the magnetization pretreatment on magnetic and coagulant used can effectively alleviate membrane fouling purpose.

【學(xué)位授予單位】：天津工業(yè)大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TU991.24

【參考文獻(xiàn)】

相關(guān)期刊論文 前10條

1 田建波;范擎虹;;淺析我國黑臭水體現(xiàn)狀及整治技術(shù)[J];技術(shù)與市場;2016年08期

2 蔣丹;張波;郭效琛;何義亮;;納米Fe_3O_4作為助凝劑去除水體中藻毒素的效果研究[J];給水排水;2016年01期

3 顧時國;延克軍;甄樹聰;吳佳歡;;交流變頻磁化聚合硫酸鐵混凝處理造紙廢水[J];化工環(huán)保;2015年06期

4 胡洪營;孫艷;席勁瑛;趙婷婷;;城市黑臭水體治理與水質(zhì)長效改善保持技術(shù)分析[J];環(huán)境保護(hù);2015年13期

5 王捷;楊軍;賈輝;張宏偉;;磁絮凝膜過濾工藝中附加磁場強化清洗[J];化工學(xué)報;2014年12期

6 張春華;延克軍;于海;王麗;王利;;電磁場作用下PFS中鐵的形態(tài)分布及混凝性能研究[J];安全與環(huán)境學(xué)報;2014年04期

7 王捷;尹延梅;賈輝;張宏偉;;磁場強化絮凝減緩膜污染的影響因素分析[J];環(huán)境科學(xué)學(xué)報;2013年03期

8 齊心;黃文龍;;無機高分子聚合鐵鹽混凝劑的新研究進(jìn)展[J];化學(xué)工程與裝備;2011年09期

9 胡家瑋;李軍;陳瑜;陳旭孌;;磁絮凝在強化處理受污染河水中的應(yīng)用[J];中國給水排水;2011年15期

10 ;Speciation characterization and coagulation of poly-silica-ferric-chloride:The role of hydrolyzed Fe(Ⅲ) and silica interaction[J];Journal of Environmental Sciences;2011年05期

，

本文編號：1403459