發(fā)布時間：2018-03-01 05:01

  本文關(guān)鍵詞： 采氣廢水 酸析 Fenton 吸附　出處：《西南科技大學(xué)》2015年碩士論文　論文類型：學(xué)位論文

【摘要】：高含鹽采氣廢水具有水質(zhì)成分復(fù)雜、油類物質(zhì)含量高、礦化度高、COD含量高、氯離子濃度高、難以生化等特點。生物法或單一物化法無法將其處理后達(dá)標(biāo)排放,該類廢水的治理已成為安全處置各類工業(yè)廢水中的難題。本課題采取多種方法聯(lián)用的方式,組成新的處理工藝,并通過試驗探尋處理高含鹽采氣廢水的最優(yōu)組合工藝,具有現(xiàn)實的研究意義和潛在的應(yīng)用價值。本試驗選用酸析-Fenton-活性炭吸附組合工藝處理川西某氣井采氣廢水,通過實驗探討處理該廢水的可行性、污染指標(biāo)相應(yīng)變化及各個因素對處理效果的影響,最終確定組合工藝的最佳反應(yīng)條件。首先,在分析采氣廢水各項水質(zhì)指標(biāo)的基礎(chǔ)上進行酸析實驗。在p H值為1時,SS、油類物質(zhì)、色度、COD去除率可分別達(dá)到91%、30%、32%和27%,油水分離效果較好。然后,以Fenton氧化法處理酸析后的廢水,開展對廢水COD去除的影響因素分析,以正交試驗確定Fenton法的最佳處理條件。數(shù)據(jù)表明Fenton法處理廢水的最佳操作條件為:H2O2/COD為7,H2O2/Fe2+(摩爾比)為3,p H值為1,反應(yīng)時間為120min;此時COD、SS、油類物質(zhì)、色度的去除率可分別達(dá)到64%、97%、89%、93%,處理效果顯著。最后,對經(jīng)Fenton氧化處理后的廢水,采用活性炭進行吸附處理。吸附試驗考查了吸附材料的不同投加量以及吸附時間對廢水COD去除率的影響。結(jié)果表明,常溫下按20g/L投加活性炭,反應(yīng)11h后,出水COD去除率可達(dá)57%,處理后出水澄清透明。從經(jīng)濟技術(shù)及實際應(yīng)用出發(fā),考慮將Fenton試劑及吸附材料分批次投加,優(yōu)化物化組合工藝,COD去除率顯著增大。由此可得分批投加藥劑會進一步提高反應(yīng)效果。在組合工藝最佳處理條件下,CODcr值低于100mg/L,處理后出水指標(biāo)達(dá)到國家《污水綜合排放標(biāo)準(zhǔn)》(GB8978-1996)一級標(biāo)準(zhǔn)。經(jīng)估算,該組合工藝處理采氣廢水外排達(dá)標(biāo)的運行成本費用累計為19.64~34.88元/m3。綜上所述,酸析-Fenton氧化-活性炭吸附工藝在技術(shù)和經(jīng)濟上是行之有效的,具有良好的應(yīng)用價值和推廣前景。
[Abstract]:The wastewater with high salt content is characterized by complex water quality, high oil content, high salinity, high COD content, high chloride ion concentration, difficult biochemistry and so on. The treatment of this kind of wastewater has become a difficult problem in the safe disposal of all kinds of industrial wastewater. In this paper, a new treatment process is formed by using a variety of methods, and the optimal combination process for the treatment of high salt gas recovery wastewater is explored through experiments. It is of practical significance and potential application value. In this experiment, a combination of acidation-Fenton-activated carbon adsorption process was used to treat gas recovery wastewater from a gas well in western Sichuan, and the feasibility of treating the wastewater was discussed through experiments. The corresponding change of pollution index and the influence of various factors on the treatment effect, finally determine the best reaction conditions of the combined process. First of all, On the basis of analyzing the water quality index of gas recovery wastewater, the acid analysis experiment was carried out. When pH value was 1:00 / SS, the removal rate of oil substance and chromaticity Fenton could reach 91% and 27% respectively. The separation effect of oil and water was better. Then, the wastewater after acid analysis was treated by Fenton oxidation method. Carry out the analysis of influencing factors on COD removal of wastewater, The optimum treatment conditions of Fenton method were determined by orthogonal test. The data show that the optimal operating conditions of Fenton process for wastewater treatment are as follows: the COD of Fenton is 7H _ 2O _ 2 / Fe _ 2 (molar ratio) is 3 / H _ H = 1 and the reaction time is 120 min, and the COD _ (2) / H _ (2) / Fe _ (2) is 120 min. The removal rate of chromaticity can reach 64 / 97 / 993, respectively, and the treatment effect is remarkable. Finally, the wastewater treated by Fenton oxidation, The effects of different dosage of adsorbed materials and adsorption time on the removal rate of COD in wastewater were investigated. The results showed that the activated carbon was added at 20 g / L at room temperature for 11 h. The removal rate of COD in effluent can reach 57%, and the effluent is clear and transparent after treatment. From the point of view of economic, technical and practical application, the batch addition of Fenton reagent and adsorption material is considered. The COD removal rate of the optimized physico-chemical combination process increased significantly, and the reaction effect could be further improved by adding chemicals in batches. Under the optimum treatment conditions, the CODcr value was lower than 100 mg / L, and the effluent after treatment reached the national wastewater synthesis. Combined emission standard (GB 8978-1996). The total operating cost of the combined process is 19.64 ~ 34.88 yuan / m ~ (3). To sum up, the acidation-Fenton oxidation-activated carbon adsorption process is effective in technology and economy, and has good application value and popularizing prospect.
【學(xué)位授予單位】：西南科技大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：X741

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本文編號：1550491