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

【摘要】：腈綸廢水成分復雜,是一種典型的難降解有機工業(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物,隨著排放標準的日益嚴格,亟需先進的處理技術對該類廢水進行處理�；炷恋砉に囈蚱涓咝�、價格低廉,操作簡單,管理方便等特點被認為是性價比較高的深度處理技術,成為腈綸廢水深度處理工藝中的首選工藝。對于難降解有機物,傳統(tǒng)混凝劑的去除能力有限,出水中的殘余化學需氧量(COD)難以達標排放。為此,本研究針對腈綸廢水生化出水中的難降解有機物,研制一種氧化型聚硅酸鐵(PSF)無機復合高分子混凝劑,研究了該混凝劑的優(yōu)化制備、最優(yōu)反應條件,在此基礎上考察了混凝劑結構、混凝效率以及絮體性質(zhì),探究了混凝劑作用機理,為將該混凝劑應用于腈綸廢水深度處理工藝中奠定了理論基礎。主要研究內(nèi)容及結果如下: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,陳化時間為3d,在此優(yōu)化基礎上,采用SEM、TEM技術對混凝劑形貌進行了表征,結果發(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)過復雜的聚合反應生成了非晶體、無規(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象,系統(tǒng)考察了反應條件原水p H、混凝劑投加量、慢攪時間對CODcr去除率的影響,優(yōu)化得到了最佳反應條件:原水p H為7,混凝劑投加量為1.548mmol/L,慢攪時間為20min,此時CODcr去除率達到了43.00%,DOC去除率達到了36.80%,TN去除率達到了18.00%,濁度去除率達到了97.37%,各指標達到了《污水綜合排放標準》(GB8978-1996)中腈綸廢水排放一級標準,三維熒光掃描結果發(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理:采用p H計、小角激光散射技術研究混凝劑陳化過程中的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果;絮體的生長速度快、絮體強度高、復原能力強,對于腈綸廢水生化出水特定水質(zhì)條件,混凝機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.
【學位授予單位】：河北工程大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：X783.4

【參考文獻】

相關期刊論文 前10條

1 俞尚清,傅天杭,潘志彥;用粉煤灰制取聚硅酸氯化鋁鐵絮凝劑的研究[J];粉煤灰綜合利用;2003年05期

2 石健;朱永剛;王東升;鐘佐q，

本文編號：1652261