活性炭吸附处理印染废水及再生研究

Study on AC adsorption treatment of printing and dyeing wastewater and the regeneration process

印染废水的污染强度高、处理难度大,为了满足行业最新排放标准,往往需要对其进行深度处理。采用活性炭深度处理印染废水,考察吸附时间、吸附剂用量、温度、废水pH等因素对废水化学需氧量去除率的影响。另外,对饱和活性炭进行再生处理,考察不同溶剂在加热条件下对活性炭的振荡洗涤效果,并采用微波、超声等方式辅助再生过程。实验结果表明,活性炭对印染废水具有良好的深度处理能力,对饱和活性炭进行加热再生、微波再生几乎可以完全恢复其吸附效率。活性炭的性质表征结果说明,污染物的吸附过程使活性炭的孔道受到堵塞,而加热再生、微波再生有助于恢复活性炭的比表面积,重新释放活性炭的吸附位。

Due to the highly polluted level of printing and dyeing wastewater,it is difficult to be treated and meet the latest industry discharge standards.Thus,it is necessary to carried out the advanced treatment process.Activated carbon(AC)was used for the advanced treatment of printing and dyeing wastewater,and investigated the effect of adsorption time,adsorbent dosage,temperature,and pH value on the COD removal.In addition,the saturated AC was regenerated by washing with several solvents under the heating condition.The effect of microwave and ultrasonic on the regeneration process was also investigated.It was shown from the experimental results that AC adsorption process was efficient for the advanced treatment of printing and dyeing wastewater.The saturated AC could be almost completely recovered by the thermal and microwave regeneration process.Characterization analysis indicated that the adsorption of pollutants caused the pore blockage of AC.The thermal and microwave regeneration process was beneficial to recover the specific surface area of AC and released the adsorption sites.