本文關(guān)鍵詞：鋁板熱連軋乳化液廢水處理的實(shí)驗(yàn)研究　出處：《重慶大學(xué)》2016年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 鋁板熱連軋 乳化液廢水 破乳 絮凝 Fenton氧化

【摘要】：鋁板帶熱連軋是鋁加工的主要工藝之一,而在鋁板帶熱連軋中使用的油-水乳化液則起著不可替代的重要作用,這種乳化液經(jīng)一定的使用周期后將會(huì)變質(zhì)失效,失效后的乳化液即為乳化液廢水。乳化液廢水由于具有較高濃度的有機(jī)物含量和油含量,直接排放會(huì)污染環(huán)境,必須經(jīng)過處理以達(dá)到國家排放標(biāo)準(zhǔn)才可排放。我國鋁板熱連軋乳化液廢水年排放量為0.57~1.54億噸,如何合理地處理大量的乳化液廢水以實(shí)現(xiàn)達(dá)標(biāo)排放是鋁加工領(lǐng)域內(nèi)的重要課題。本文以鋁板熱連軋工藝產(chǎn)生的乳化液廢水為研究對(duì)象,采用實(shí)驗(yàn)方法對(duì)靜置—破乳絮凝—Fenton氧化工藝處理乳化液廢水的工藝過程進(jìn)行了研究,系統(tǒng)地探究了靜置環(huán)節(jié)、破乳絮凝環(huán)節(jié)以及Fenton氧化環(huán)節(jié)中各工藝參數(shù)對(duì)乳化液廢水處理效果的影響規(guī)律。通過實(shí)驗(yàn)研究分別確定了采用該工藝處理乳化液廢水時(shí)各工藝環(huán)節(jié)合理的工藝條件,結(jié)果表明,對(duì)鋁板熱連軋工藝乳化液廢水采用靜置—破乳絮凝—Fenton氧化工藝處理可使乳化液廢水的COD(化學(xué)需氧量)濃度達(dá)到104mg/L,符合國標(biāo)二級(jí)排放對(duì)廢水中COD濃度的要求,為廢水經(jīng)后續(xù)生化處理后實(shí)現(xiàn)安全排放創(chuàng)造了有利條件。具體研究內(nèi)容和研究結(jié)果如下:(1)實(shí)驗(yàn)研究了靜置處理過程中乳化液廢水浮油層厚度與靜置時(shí)間的變化關(guān)系。結(jié)果表明,靜置處理能夠去除乳化液廢水中的游離油和懸浮油,使它們逐漸轉(zhuǎn)化為浮油,在靜置時(shí)間1~16min內(nèi),浮油層厚度增大,浮油層顏色變深,16~91min內(nèi),浮油層厚度不變,浮油層顏色變深,91min之后,浮油層厚度和顏色均不再變化,說明乳化液廢水中能夠靜置上浮的懸浮油和游離油,已經(jīng)完全實(shí)現(xiàn)向浮油的轉(zhuǎn)化。(2)對(duì)經(jīng)靜置處理后的乳化液廢水進(jìn)行破乳處理,實(shí)驗(yàn)研究了破乳處理過程中濃硫酸投加量、反應(yīng)溫度、靜置時(shí)間對(duì)廢水中乳化油油水分離的影響。結(jié)果顯示,硫酸的酸化作用破壞了廢水中乳化油的狀態(tài),使乳化油一部分轉(zhuǎn)化成可自發(fā)上浮的游離油和懸浮油,一部分轉(zhuǎn)化為不可自發(fā)上浮的油滴膠粒,通過測(cè)定廢水中層液的COD,得出在濃硫酸投加量15ml/L、反應(yīng)溫度50℃、靜置時(shí)間180min條件下,廢水COD去除率達(dá)到48.30%,是廢水中乳化油油水分離的合理工藝條件。(3)對(duì)經(jīng)靜置—破乳處理后的乳化液廢水進(jìn)行絮凝處理,實(shí)驗(yàn)研究了絮凝處理過程中廢水pH值、絮凝劑Al2(SO4)3或FeCl3的投加量對(duì)廢水中油滴聚結(jié)的影響。結(jié)果表明,Al2(SO4)3和FeCl3的絮凝聚結(jié)作用都能夠去除廢水中由乳化油轉(zhuǎn)化成的油滴膠粒,Al2(SO4)3絮凝作用比FeCl3大,在Al2(SO4)3投加量4g/L、廢水pH值為7.20、靜置時(shí)間180min的條件下,COD去除率達(dá)到85.70%,乳化液廢水的COD濃度由8480mg/L降低到了1212mg/L,是廢水中油滴膠粒聚結(jié)的合理工藝條件。(4)對(duì)經(jīng)靜置—破乳絮凝處理后的乳化液廢水進(jìn)行Fenton氧化處理,實(shí)驗(yàn)研究了Fenton氧化處理過程中H_2O_2投加量、FeSO_4·7H_2O投加量、廢水pH值對(duì)廢水有機(jī)物去除率的影響,用COD表征廢水中有機(jī)物的含量,分析了各因素的單獨(dú)影響及其交互影響。結(jié)果顯示,H_2O_2的投加量比FeSO_4?7H_2O投加量和廢水pH值對(duì)廢水COD的去除率的影響更顯著,而后兩者影響力相當(dāng),結(jié)合廢水處理的有效性和經(jīng)濟(jì)性考慮,得出在廢水pH值為3.5、H_2O_2的投加量45ml/L,FeSO_4?7H_2O投加量1.75g/L,氧化反應(yīng)時(shí)間120min的條件下,廢水COD去除率達(dá)到98.77%,是Fenton氧化處理乳化液廢水的合理工藝條件。(5)采用靜置—破乳絮凝—Fenton氧化工藝處理乳化液廢水,各工藝環(huán)節(jié)都在合理的工藝條件下時(shí),可使乳化液廢水的COD濃度達(dá)到104mg/L,符合國標(biāo)二級(jí)排放對(duì)廢水中COD濃度的要求,為廢水經(jīng)后續(xù)生化處理后實(shí)現(xiàn)安全排放創(chuàng)造了有利條件。
[Abstract]:Aluminum strip hot rolling is one of the main process of aluminum processing, and used in hot rolling oil on aluminum water emulsion plays an irreplaceable important role. This kind of emulsion by periodicity will metamorphic failure after failure, the emulsion for emulsion wastewater emulsion wastewater. The content of organic matter and oil content in higher concentration, direct emissions will pollute the environment, must be processed to meet the national emission standards before discharge. The annual emissions of China's aluminum hot rolling emulsion wastewater is 0.57~1.54 million tons, how to reasonably large number of emulsion wastewater treatment to achieve discharge standards is an important topic in aluminum processing field in the emulsion wastewater produced by aluminum hot rolling process as the research object, using the experiment method to process the static - demulsification flocculation Fenton oxidation process of emulsion wastewater treatment Study systematically explores the static link, influence of various process parameters of demulsification flocculation and Fenton oxidation process on the part of emulsion wastewater treatment. The process conditions of emulsion wastewater when each process reasonable were determined through the experimental results show that the aluminum hot rolling process of emulsified liquid waste water with static - demulsification flocculation Fenton oxidation process can make the emulsion wastewater COD (chemical oxygen demand) concentration reached 104mg/L, with two GB emission requirements on COD concentration in the wastewater, and create favorable conditions for the wastewater after the follow-up biochemical treatment to achieve safe discharge. The specific research contents and results are as follows: (1) experimental study on the relationship between the static process of emulsion wastewater from the floating oil thickness and change the static time. The results show that the static treatment can remove emulsion in Wastewater Free of oil and suspended oil, make them gradually into the oil slick, in static 1~16min, oil layer thickness increases, the oil layer become darker in color, 16~91min, oil layer thickness and oil layer become darker in color, 91min, thickness of oil layer and color have no change, said suspension emulsion waste oil the water can be static and free floating oil, has been fully realized to the oil slick transformation. (2) of the demulsification of emulsion wastewater from static treatment, experimental study on the demulsification process of sulfuric acid dosage, reaction temperature and time on the effect of oil-water separation of emulsified oil in wastewater by static. The results showed that the acidification effect of sulfuric acid destroys the emulsified oil wastewater in the state, the emulsified oil is partially transformed into free oil and suspended oil can spontaneously go up, a part can not be transformed into spontaneous floating oil droplet particles, through the determination of waste water layer liquid COD, too The dosage of concentrated sulfuric acid 15ml/L, reaction temperature is 50 DEG C, the static time 180min conditions, the removal rate of COD reached 48.30%, is the reasonable process conditions of oil-water separation of emulsified oil in wastewater. (3) on the flocculation treatment by static - emulsion wastewater demulsification treatment, experimental study on the wastewater pH in the process of flocculation, flocculant Al2 (SO4) 3 or FeCl3 dosage of wastewater of oil droplet coalescence. The results showed that Al2 (SO4) 3 and FeCl3 flocculation and coalescence effect to removal of wastewater by emulsified oil into the oil droplet particles, Al2 (SO4) 3 flocculation more than FeCl3, in Al2 (SO4) 3 dosage is 4g/L, wastewater pH value is 7.20, the static time under the condition of 180min, the removal rate of COD reached 85.70%, the concentration of COD emulsion wastewater is decreased from 8480mg/L to 1212mg/L, is the reasonable process conditions of wastewater of oil droplet coalescence of particles of (4). The static - demulsification flocculation treatment Fenton oxidation treatment of emulsion wastewater, experimental study of Fenton oxidation process in H_2O_2 dosage, FeSO_4 dosage of 7H_2O wastewater, effects of pH on removal of organic wastewater, with the content of organic matter in wastewater characterization of COD, analyzes the influence of various factors alone and interactive effects. The results showed H_2O_2, the dosage ratio of FeSO_4? 7H_2O dosage and pH value of wastewater on the removal rate of wastewater COD effect is more significant, the latter two influence, combined with effective and economical wastewater treatment, the wastewater in pH was 3.5, the dosage of H_2O_2 45ml/L, FeSO_4 7H_2O dosage? The amount of 1.75g/L, reaction time 120min, the removal rate of COD reached 98.77%, is the reasonable process conditions of emulsion wastewater treatment. The oxidation of Fenton (5) with static - demulsification flocculation Fenton oxidation process of emulsion wastewater treatment, each process Under the reasonable process conditions, the COD concentration of emulsion wastewater can reach 104mg/L, which is in line with the requirements of the national standard two level discharge to the COD concentration of wastewater. It creates favorable conditions for the safe discharge of wastewater after subsequent biochemical treatment.

【學(xué)位授予單位】：重慶大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2016
【分類號(hào)】：X76

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