本文關(guān)鍵詞： 電絮凝 花生殼 NaOH改性稻殼 吸附 孔雀石綠　出處：《吉林大學(xué)》2017年碩士論文　論文類型：學(xué)位論文

【摘要】：我國的染料廢水排放量大、治理技術(shù)不完善使染料廢水的危害愈加嚴(yán)重,染料廢水的治理成為熱點問題。電絮凝技術(shù)因為其設(shè)備簡單、環(huán)境友好、易于自動控制近年來成為研究熱點,但其存在能耗高,電極易鈍化等問題。本研究在傳統(tǒng)電絮凝的基礎(chǔ)上分別加入花生殼、改性稻殼作為吸附劑,構(gòu)造電絮凝生物吸附劑吸附耦合體系處理孔雀石綠(MG)廢水,意圖在較短的處理時間和較低的能耗下獲得較高的去除率。本文先制備花生殼(PS)、Na OH改性稻殼吸附劑(Na OH-RH),采用掃描電鏡(SEM)、傅里葉轉(zhuǎn)換紅外光譜(FT-IR)、比表面積測試(BET)等手段對吸附劑進(jìn)行表征,表明其具有良好的吸附性。用質(zhì)量滴定法分別測定p Hpzc,結(jié)果表明花生殼吸附陽離子染料的適宜p H為p H5.8,Na OH改性稻殼作吸附劑的適宜p H為p H7.4。探討電絮凝花生殼吸附耦合體系中電流密度、花生殼投加量、溶液初始p H值、孔雀石綠溶液初始濃度等因素對去除效率的影響,得出最佳電流密度為2m A/cm2,溶液最佳初始p H值為7,花生殼最佳投加量為5g/L,最佳孔雀石綠初始濃度為50mg/L,在此條件下,5min內(nèi),去除效率可達(dá)98.2%,比傳統(tǒng)電絮凝體系提高了22.4%,反應(yīng)時間縮短了55min,比單獨花生殼吸附體系去除效率提高了18.1%,反應(yīng)時間縮短了35min。在上述體系的最佳電流密度和最佳孔雀石綠溶液初始濃度下,探討電絮凝改性稻殼體系中改性固液比、改性時間、溶液初始p H值、改性稻殼投加量對去除效率的影響。得出最佳條件為:固液比1:8,改性時間30min,溶液初始p H值為8,改性稻殼投加量為3g/L,在此條件下,10min內(nèi),孔雀石綠的去除效率可達(dá)97.5%,比傳統(tǒng)電絮凝體系提高了21.7%,反應(yīng)時間縮短了50min,比單獨Na OH改性稻殼吸附體系的去除率提高了17.2%,反應(yīng)時間縮短了30min。計算不同體系的單位能耗和單位電極材料消耗,結(jié)果表明,電絮凝花生殼吸附耦合體系的單位能耗和單位電極材料消耗比傳統(tǒng)電絮凝體系降低了97.4%,電絮凝Na OH改性稻殼吸附耦合體系比傳統(tǒng)電絮凝體系降低了88.9%。對吸附劑吸附過程進(jìn)行吸附等溫線模型擬合,表明花生殼、Na OH改性稻殼吸附過程分別符合Langmuir吸附等溫模型和Freundlich吸附等溫模型,吸附動力學(xué)均符合準(zhǔn)二級動力學(xué)模型,對電絮凝體系和耦合體系進(jìn)行反應(yīng)動力學(xué)模型擬合,說明兩種體系的反應(yīng)均較符合二級動力學(xué)模型。
[Abstract]:Because of the large discharge of dyestuff wastewater in our country and the imperfect treatment technology, the harm of dyestuff wastewater becomes more and more serious, and the treatment of dyestuff wastewater becomes a hot issue. The electroflocculation technology has simple equipment and friendly environment. In recent years, easy automatic control has become a research hotspot, but it has many problems such as high energy consumption, easy passivation of electrode and so on. In this study, peanut shell was added on the basis of traditional electroflocculation, and modified rice husk was used as adsorbent. In order to get a higher removal rate of malachite green MG wastewater by using an electroflocculating biological adsorbent coupling system, a peanut hulls (PSS) was prepared in this paper. In this paper, the treatment of malachite green MG wastewater was carried out in order to obtain a higher removal rate under shorter treatment time and lower energy consumption. NaOH modified rice husk adsorbent, NaOH-RHH, was used by scanning electron microscope (SEM) and Fourier transform infrared spectroscopy (FTIR). The adsorbents were characterized by specific surface area test (BET) and the results showed that the adsorbents had good adsorbability. The p Hpzc was determined by mass titration. The results showed that the suitable pH for the adsorption of cationic dyes from peanut shell was pH 5.8. The suitable pH of NaOH modified rice husk as adsorbent was pH 7.4. The electric current density, peanut shell dosage and initial pH value of solution were studied in the electroflocculation peanut shell adsorption coupling system. The effect of the initial concentration of malachite green solution on the removal efficiency was studied. The optimum current density was 2 m / cm 2, the initial pH value was 7, and the optimum dosage of peanut shell was 5 g / L. The optimum initial concentration of malachite green is 50 mg / L, under this condition, the removal efficiency of malachite green can reach 98.22% within 5 minutes, which is 22.4% higher than that of traditional electroflocculation system. The reaction time was shortened by 55 min, and the removal efficiency was increased by 18.1% compared with the adsorption system of peanut shell alone. Under the optimum current density and the optimum initial concentration of malachite green solution, the ratio of solid to liquid and the time of modification in the electroflocculation modified rice husk system were discussed. The effect of initial pH value of the solution and the amount of modified rice husk on the removal efficiency was obtained. The optimum conditions were as follows: the ratio of solid to liquid was 1: 8, the modification time was 30 min, and the initial pH value of the solution was 8. The dosage of modified rice husk is 3 g / L, under this condition, the removal efficiency of malachite green can reach 97.5, which is 21.7% higher than that of traditional electroflocculation system. The reaction time was shortened by 50 mins, and the removal rate of rice husk modified by NaOH was increased by 17.2% compared with that of the single NaOH modified rice husk adsorption system. The reaction time was shortened by 30 mins. The unit energy consumption and the unit electrode material consumption of different systems were calculated. The unit energy consumption and unit electrode material consumption of the electroflocculation peanut shell adsorption coupling system was 97.4% lower than that of the traditional electroflocculation system. Compared with the traditional electroflocculation system, the adsorption coupling system of NaOH modified rice husk decreased 88.9.The adsorption process of adsorbent was fitted by isotherm model, which showed that peanut shell. The adsorption process of rice husk modified by NaOH accords with Langmuir adsorption isotherm model and Freundlich adsorption isotherm model, and adsorption kinetics accords with quasi second-order kinetic model. The reaction kinetics model of electroflocculation system and coupling system is fitted, which shows that the reaction of the two systems is in good agreement with the second-order kinetic model.
【學(xué)位授予單位】：吉林大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：X788

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