本文選題：氧化型聚硅酸鐵　切入點(diǎn)：制備　出處：《河北工程大學(xué)》2015年碩士論文　論文類型：學(xué)位論文

【摘要】：腈綸廢水成分復(fù)雜,是一種典型的難降解有機(jī)工業(yè)廢水,即便生化處理后出水中仍含有多種難降解易引發(fā)生物毒害作用的有機(jī)物,隨著排放標(biāo)準(zhǔn)的日益嚴(yán)格,亟需先進(jìn)的處理技術(shù)對(duì)該類廢水進(jìn)行處理�；炷恋砉に囈蚱涓咝Аr(jià)格低廉,操作簡(jiǎn)單,管理方便等特點(diǎn)被認(rèn)為是性價(jià)比較高的深度處理技術(shù),成為腈綸廢水深度處理工藝中的首選工藝。對(duì)于難降解有機(jī)物,傳統(tǒng)混凝劑的去除能力有限,出水中的殘余化學(xué)需氧量(COD)難以達(dá)標(biāo)排放。為此,本研究針對(duì)腈綸廢水生化出水中的難降解有機(jī)物,研制一種氧化型聚硅酸鐵(PSF)無(wú)機(jī)復(fù)合高分子混凝劑,研究了該混凝劑的優(yōu)化制備、最優(yōu)反應(yīng)條件,在此基礎(chǔ)上考察了混凝劑結(jié)構(gòu)、混凝效率以及絮體性質(zhì),探究了混凝劑作用機(jī)理,為將該混凝劑應(yīng)用于腈綸廢水深度處理工藝中奠定了理論基礎(chǔ)。主要研究?jī)?nèi)容及結(jié)果如下:用硫酸亞鐵、硅酸鈉、氯酸鈉、硫酸等原料制備了氧化型聚硅酸鐵混凝劑,并優(yōu)化得到了最佳制備條件:混凝劑初始p H為1.67,氯酸鈉用量為8g/L,Fe/Si摩爾比為1.3,陳化時(shí)間為3d,在此優(yōu)化基礎(chǔ)上,采用SEM、TEM技術(shù)對(duì)混凝劑形貌進(jìn)行了表征,結(jié)果發(fā)現(xiàn)混凝劑中聚硅酸和鐵并不是單純的混合,而是兩者之間經(jīng)過(guò)復(fù)雜的聚合反應(yīng)生成了非晶體、無(wú)規(guī)則的高分子氧化型聚硅酸鐵。以腈綸廢水生化出水為處理對(duì)象,系統(tǒng)考察了反應(yīng)條件原水p H、混凝劑投加量、慢攪時(shí)間對(duì)CODcr去除率的影響,優(yōu)化得到了最佳反應(yīng)條件:原水p H為7,混凝劑投加量為1.548mmol/L,慢攪時(shí)間為20min,此時(shí)CODcr去除率達(dá)到了43.00%,DOC去除率達(dá)到了36.80%,TN去除率達(dá)到了18.00%,濁度去除率達(dá)到了97.37%,各指標(biāo)達(dá)到了《污水綜合排放標(biāo)準(zhǔn)》(GB8978-1996)中腈綸廢水排放一級(jí)標(biāo)準(zhǔn),三維熒光掃描結(jié)果發(fā)現(xiàn):混凝劑可有效處理腈綸廢水中腐殖質(zhì)類物質(zhì)、類蛋白類物質(zhì)以及UV腐殖質(zhì)類物質(zhì)�；炷Ч麅�(yōu)于傳統(tǒng)的聚合鐵和聚硅酸硫酸鋁。研究混凝劑混凝作用機(jī)理:采用p H計(jì)、小角激光散射技術(shù)研究混凝劑陳化過(guò)程中的p H變化以及絮體性質(zhì),發(fā)現(xiàn)p H變化規(guī)律是聚硅酸和鐵綜合作用的結(jié)果;絮體的生長(zhǎng)速度快、絮體強(qiáng)度高、復(fù)原能力強(qiáng),對(duì)于腈綸廢水生化出水特定水質(zhì)條件,混凝機(jī)制以電中和作用為主。
[Abstract]:Acrylonitrile wastewater is a typical organic industrial wastewater with complex composition. Even after biochemical treatment, the effluent still contains a variety of organic compounds that are difficult to degrade and easily lead to biological toxicity. With the increasingly stringent discharge standards, Because of its high efficiency, low price, simple operation and convenient management, coagulation and sedimentation process is considered to be a high performance and price ratio advanced treatment technology. For refractory organic matter, the removal capacity of traditional coagulant is limited, and the residual COD in effluent is difficult to discharge. In this paper, an oxidized polysilicate iron silicate (PSF) inorganic composite polymer coagulant was developed for the refractory organic matter in the biochemical effluent of acrylic fiber wastewater. The optimum preparation and reaction conditions of the coagulant were studied. On this basis, the coagulant structure, coagulation efficiency and flocculation properties were investigated, and the mechanism of coagulant action was explored. The main research contents and results are as follows: the oxidized polysilicate ferric silicate coagulant was prepared with ferrous sulfate, sodium silicate, sodium chlorate, sulfuric acid and other raw materials. The optimum preparation conditions were obtained as follows: the initial pH of coagulant was 1.67, the dosage of sodium chlorate was 1.3 g / L Fe / Si molar ratio, and the aging time was 3 days. On the basis of the optimization, the morphology of coagulant was characterized by means of SEMT-TEM. The results showed that polysilicic acid and iron in coagulant were not a simple mixture, but formed amorphous, irregular polymeric oxidized polysilicate ferric acid through complex polymerization reaction between them. The biochemical effluent of acrylic fiber wastewater was treated as the object. The effects of reaction conditions, raw water pH, coagulant dosage and slow stirring time on the removal rate of CODcr were systematically investigated. The optimum reaction conditions were obtained as follows: raw water pH was 7, coagulant dosage was 1.548 mmol / L, slow stirring time was 20 minutes, and the removal rate of CODcr reached 43.00 and reached 36.80% TN removal rate, and turbidity removal rate reached 97.37, and each index reached 97.37. The first class standard for the discharge of acrylic fiber wastewater in the Integrated Wastewater discharge Standard (GB8978-1996) was introduced. The results of three dimensional fluorescence scanning showed that the coagulant could effectively treat humus in acrylic fiber wastewater. Protein-like substances and UV humus substances. The coagulation effect is superior to that of traditional polymeric iron and polysilicate aluminum sulfate. The change of pH and the properties of flocs during coagulant aging were studied by small-angle laser scattering technique. It was found that the variation of pH was the result of the comprehensive action of polysilicic acid and iron, and the flocs had fast growth rate, high floc strength and strong resilience. For the specific water quality conditions of biochemical effluent of acrylic fiber wastewater, the coagulation mechanism is mainly electric neutralization.
【學(xué)位授予單位】：河北工程大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：X783.4

【參考文獻(xiàn)】

相關(guān)期刊論文 前10條

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本文編號(hào)：1652261