活性炭吸附處理電鍍廢水中的EDTA

更新時間：2014-07-16 10:41 來源：環境工程學報作者: 閱讀：2207

中文摘要:

采用顆粒活性炭對模擬廢水中EDTA進行批式吸附實驗,在實驗中考察了恒溫振蕩器的振蕩速度、溫度、pH值等因素對吸附的影響,同時探討了吸附等溫線模型和吸附動力學模型。實驗結果表明,在25℃時活性炭對EDTA的吸附平衡時間為40 h。在pH值為5.0、溫度為25℃、振蕩器振蕩速度為200 r/min、活性炭粒徑為1~2 mm、活性炭加入量為10 g/L的情況下,EDTA的濃度在48 h內由368.8 mg/L降低至76.34 mg/L,對應的COD值從305.9 mg/L 降低為67.21 mg/L,去除率達到了79.3%。活性炭對EDTA的吸附符合Langmuir吸附等溫線模型,其吸附行為可以用準二級吸附動力學模型來描述。

英文摘要:

In this study, granular activated carbon was used to adsorb EDTA from simulated wastewater by conducting series of batch experiments. Several influencing factors were evaluated which included shaking speed of constant temperature oscillator, water temperature and pH value. In addition, the adsorption equilibrium isotherms model and adsorption kinetics model were investigated. The results show that it takes 40 h for the adsorption of EDTA to reach equilibrium at 25℃. EDTA is reduced by 79.3% within 48 h, from 368.8 mg/L to 76.34 mg/L, under the conditions of pH value of 5.0, temperature of 25℃, shaking speed of 200 r/min, grain size of 1~2 mm, activated carbon dosage of 10 g/L. Meanwhile COD value decreases from 305.9 mg/L to 67.21 mg/L. Furthermore, the adsorption of activated carbon on EDTA is best fitted with Langmuir adsorption model, the kinetic process of adsorption can be described by the pseudo-second-order kinetic model.

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