摘要
利用剩余污泥分别在300、350、400℃下热处理制备了生物炭S300、S350、S400,对其进行了物性表征,并分析了对实际印染废水的吸附特性。结果表明,随着反应温度的升高,污泥发生了炭化反应,污泥网络结构逐渐被破坏,生物炭表面呈现粗糙不平且不规则的空间结构,其比表面积与孔容积逐渐增大,S400的比表面积达到157.4 m^2/g。在28℃,投加量为1 g/L,吸附时间为60 min的条件下,S400对印染废水的脱色率为75%,COD去除率为45%,出水COD为36.4 mg/L,达到了GB 18918-2002的一级A标准。生物炭对印染废水的准2级吸附动力学拟合度更高,其吸附行为更符合准2级吸附动力学,并均以化学吸附为主。
The biochars S300,S350,S400 were produced from excess sludge with 300,350,400℃heat treatment respectively,and the physical properties of biochar were characterized,and its adsorption property for printing and dyeing wastewater was analyzed.The results showed that,the sludge carbonization occurred,the sludge network structure was gradually destroyed,the surface of biochar present rough and irregular spatial structure,its specific surface area and pore volume gradually increased,and the specific surface area of S400 reached 157.4 m^2/g with increasing of reaction temperature.When the temperature,biochar dosage and adsorption time were 28℃,1 g/L and 60 min respectively,the decolorization rate,COD removal rate and COD in effluent of printing and dyeing wastewater by S400 were 75%,45%and 36.4 mg/L respectively,which reached the first level A standard of GB 18918-2002.The pseudo-second-order adsorption kinetics of biochar on printing and dyeing wastewater fitted better,and its adsorption behavior was more in line with pseudo-second-order adsorption kinetics,and chemical adsorption in dominating station.
作者
徐波
甘雁飞
丁付革
徐少南
XU Bo;GAN Yanfei;DING Fuge;XU Shaonan(CCCC Shanghai Dredging Co.,Ltd,Jiangsu Branch,Nanjing 210000,China)
出处
《水处理技术》
CAS
CSCD
北大核心
2020年第7期67-71,共5页
Technology of Water Treatment
基金
中交上海航道局科技研发项目(SHJKJ-2018-001)。
关键词
剩余污泥
生物炭
吸附
印染废水
excess sludge
biochar
adsorption
printing and dyeing wastewater
