摘要：二氧化氯具有強氧化性、不穩定性和消毒性，其氧化能力是次氯酸的9倍多，是氯的2.6倍。本文在制備二氧化氯的基礎上，用分光光度法測定反應后印染廢水的含量，從而計算二氧化氯對印染廢水的脫色率。研究攪拌速度、二氧化氯用量、pH值、反應溫度、反應時間、廢水初始濃度等對廢水的脫色效果。實驗結果表明：二氧化氯對印染廢水的脫色率在一定條件下能達到80%以上，攪拌速率、廢水起始濃度對脫色率影響不大，溫度越高廢水的脫色效果越好，反應時間也很快，10分鐘基本上完全反應，在酸性條件下脫色率較低，但在堿性條件下pH值越大脫色率越高。二氧化氯對廢水脫色的較佳條件：反應溫度25℃，反應時間20min，轉速100r/min，pH=10，二氧化氯與廢水反應的配比為1.5。
關鍵詞：印染廢水；二氧化氯； 脫色率；分光光度法
Study on Treatment of Printing wastewater
Abstract: Chlorine dioxide has strong property of oxidation, the instability and the disinfection, its oxidized ability is more than 9 times of hypochlorous, and is 2.6 times of chlorine. This article is based on the preparation of chlorine dioxide, the content of the printing wastewater was after reaction determined by spectrophotometric methods, and thus decolourization rate of printing wastewater was calculated with chlorine dioxide. Then the decolourization effect of the printing wastewater by reaction mixing speed, the amount of chlorine dioxide, pH, reaction temperature initial concentration of printing wastewater, reaction time were studied. The experimental result indicated that, the decolourization rate can achieve above 80% by chlorine dioxide under the certain condition. The mixing speed, and initial concentration of the printing wastewater are no influence to the decolourization rate. The higher temperature is, the higher decolourization rate. The reaction is very quick. The reaction would be completed within 10 minutes. Under the alkalinity condition, the larger pH is , the higher decolourization rate is. So the best condition are the followings: reaction temperature is 25℃, reaction time is 20min, rotational speed is 100r/min, pH is 10, the ratio of the printing wastewater and a chlorine dioxide response is 1.5.
Keywords: Printing wastewater; Chlorine dioxide; Decolourization rate; Spectrometric
