本文選題：地下水 + 錳��； 參考：《沈陽建筑大學(xué)》2014年碩士論文

【摘要】：地下水作為生活飲用水水源具有水質(zhì)較好、不易受污染、比較安全可靠和衛(wèi)生等優(yōu)點。地下水中鐵、錳超標會引起健康、經(jīng)濟等一系列問題,錳的氧化還原電位高于鐵,因此,Mn2+比Fe2+難以氧化,我國《生活飲用水衛(wèi)生標準》要求錳含量應(yīng)在0.1 mg/L以下,本文著重探討了陶瓷瓶平板膜在地下水除錳的應(yīng)用及處理效果。本文第一部分采用動態(tài)過濾的試驗方式,著重對曝氣接觸氧化法-陶瓷平板膜聯(lián)合除錳工藝、空氣接觸氧化法-陶瓷平板膜聯(lián)合除錳工藝、高溫催化氧化掛膜法-陶瓷平板膜聯(lián)合除錳工藝和堿化法-陶瓷平板膜聯(lián)合除錳工藝進行對比試驗,通過試驗得出的結(jié)論表明,由于陶瓷平板膜膜孔徑與Mn2+尺寸相差1000倍,差距過大,且在中性條件下,Mn2+氧化速率比較緩慢,通過調(diào)節(jié)原水錳含量、膜通量及曝氣量,在陶瓷平板膜表面均不能很好的形成錳質(zhì)活性濾膜以達到除錳目的,提高pH使原水呈堿性,加快Mn2+氧化速率,對Mn2+有非常好的去除效果,可見堿化法-陶瓷平板膜聯(lián)合除錳工藝是可行的。本文第二部分探討了不同工藝參數(shù)和水質(zhì)條件對堿化法-陶瓷平板膜聯(lián)合錳工藝的影響,研究結(jié)果表明：氧化還原電位(ORP)是除錳的重要指標,氧化體(氧)和還原體(錳)的氧化還原電位差(△E)大于零反應(yīng)即能進行,△E越大,反應(yīng)速率越快,提高原水的pH可以有效降低Mn2+氧化還原電位,錳離子的氧化速度得以加快,提高處理效果,所以pH的變化對除高、低錳影響很大,pH越高,效果越好,但處理水的pH過高,需增設(shè)酸化裝置,綜合考慮最佳pH為7.70,其次,原水維持在最適pH的情況下,膜通量及溶解氧(DO)對除錳影響效果不明顯,為滿足處理效果、出水量及經(jīng)濟性考慮,最佳膜通量范圍為225 ml/m2·min～300ml/m·min,溶解氧(DO)不低于2.3 mg/L即可。本文第三部分討論了膜污染及膜的清洗再生,首先在上一階段確定的最佳工況下連續(xù)進行除錳試驗,結(jié)果表明,當跨膜壓差0.1MPa時,膜通量急劇下降,通過電鏡掃描發(fā)現(xiàn)膜被污染物覆蓋,孔隙率降低,需要對陶瓷平板膜進行清洗,經(jīng)分析可知污染物主要為MnO2并帶有少量Mn(OH)2,均為堿性無機物,故本實驗采用酸性化學(xué)清洗的方法。試驗表明,0.1mol/LHCl浸泡膜片24h和0.1mol/LHNO3浸泡膜片24h清洗后的陶瓷平板膜,這兩種清洗方案均可以完成膜的再生,恢復(fù)陶瓷平板膜除錳能力,是理想的清洗方式。綜上所述,本文通過對陶瓷平板膜除錳方案的選擇,最佳工況的確定,膜污染機理及膜清洗方法的研究,可知堿化法-陶瓷平板膜聯(lián)合除錳工藝能有效處理含錳地下水,為進一步研究陶瓷平板膜除錳工藝奠定了基礎(chǔ)。
[Abstract]:Groundwater as a drinking water source has the advantages of better water quality, less pollution, more safety, reliability and sanitation. The excess of iron and manganese in groundwater will cause a series of problems, such as health, economy and so on. The redox potential of manganese is higher than that of iron, so it is more difficult to oxidize mn 2 than Fe2. The hygienic standard of drinking water in our country requires manganese content to be below 0. 1 mg/L. In this paper, the application and treatment effect of ceramic flask plate membrane in groundwater manganese removal are discussed. In the first part of this paper, by means of dynamic filtration, the combined removal of manganese by aeration contact oxidation and ceramic plate membrane, and by air contact oxidation and ceramic plate membrane, is emphasized. The manganese removal process of high temperature catalytic oxidation combined with ceramic plate membrane and alkaline method combined with ceramic plate membrane were compared. The experimental results showed that the pore diameter of ceramic plate membrane was 1000 times different from that of Mn2. The gap is too large, and the oxidation rate of mn _ 2 is slow under neutral conditions. By adjusting the manganese content in raw water, membrane flux and aeration rate, the active manganese filter membrane can not be formed on the surface of ceramic flat membrane to achieve the purpose of manganese removal. Increasing pH can make raw water alkaline, accelerate Mn2 oxidation rate, and have a very good removal effect on Mn2. Therefore, it is feasible to combine alkaline process with ceramic plate membrane to remove manganese. In the second part of this paper, the effects of different technological parameters and water quality conditions on the alkaline process and ceramic plate membrane combined manganese process are discussed. The results show that the redox potential (ORP) is an important index for manganese removal. The redox potential difference (E) of oxidant (oxygen) and reducer (mn) can be obtained when the redox potential is greater than zero. The larger E, the faster the reaction rate, and the higher the pH of raw water, the lower the redox potential of Mn2. The oxidation rate of manganese ion can be accelerated and the treatment effect can be improved. Therefore, the change of pH has a great effect on the treatment of low manganese. The higher the pH is, the better the effect is. However, if the pH of the treated water is too high, it is necessary to add an acidizing device, considering the optimum pH of 7.70, and secondly, When the raw water was maintained at optimum pH, the effect of membrane flux and dissolved oxygen do on manganese removal was not obvious. In order to satisfy the treatment effect, the optimal membrane flux range was 225 ml/m2 min~300ml/m / min and the dissolved oxygen DOO was no less than 2.3 mg/L, in order to satisfy the treatment effect, the optimal membrane flux was 225 ml/m2 min~300ml/m / min and the dissolved oxygen DOO was no less than 2.3 mg/L. In the third part of this paper, the membrane fouling and membrane cleaning regeneration are discussed. Firstly, the manganese removal experiments are carried out continuously under the optimum conditions determined in the previous stage. The results show that the membrane flux decreases sharply when the transmembrane pressure difference is 0.1MPa. By scanning electron microscope, it was found that the membrane was covered by contaminants and the porosity was decreased, so it was necessary to clean the ceramic flat membrane. The main pollutants were MnO2 and a small amount of MnOHH ~ (2 +), all of which were alkaline inorganic substances, so the method of acid chemical cleaning was adopted in this experiment. The results show that the ceramic plate membrane washed by 0.1 mol / L HCl immersion for 24 h and 0.1mol/LHNO3 immersion in 24 h can regenerate the membrane and restore the manganese removal ability of the ceramic plate membrane, which is an ideal cleaning method. To sum up, through the selection of manganese removal scheme of ceramic flat membrane, the determination of optimum working condition, the study of membrane fouling mechanism and membrane cleaning method, it can be concluded that the alkaline method and ceramic plate membrane combined manganese removal process can effectively treat manganese containing groundwater. It lays a foundation for further study on manganese removal process of ceramic flat membrane.
【學(xué)位授予單位】：沈陽建筑大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：TU991.2

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