摘要
以污水厂脱水污泥、锯末和焦油的混合物为原料,采用ZnC l2和KOH为活化剂制备出过渡孔发达、强度大的污泥活性炭S-AC(ZnC l2)和S-AC(KOH),并将其应用于焦化废水生化出水中COD的深度处理。结果表明:2种吸附剂对焦化废水中COD的吸附行为均符合Langmuir等温方程,吸附量随着温度的升高而增大。伪二级方程可较好地描述2种吸附剂对COD的吸附行为,静态动力学数据结果符合液膜扩散方程,液膜扩散为吸附过程的主控步骤。动态吸附与脱附研究表明:吸附流速为10 BV/h(BV为吸附剂装柱体积)时,S-AC(KOH)对COD的穿透吸附量和饱和吸附量分别为11.75 mg/mL和13.54 mg/mL;S-AC(ZnC l2)对COD的穿透吸附量和饱和吸附量分别为12.46 mg/mL和14.53 mg/mL;以质量分数5%NaOH为脱附剂,脱附流速为5 BV/h时,吸附剂的脱附率可达90%以上。
Taking dewatered sewage sludge from the sewage plant, saw dust and tar combined material as the raw material, ZnC12 and KOH activating agents were applied to prepare the sewage sludge activated carbon S-AC （ZnCl2 ） and S-AC （KOH） with the transition hole well developed and high strength. The sewage sludge activated carbons were applied to the deep treatment of the COD from the coking waste water. The results showed that the COD adsorption behaviors of the two sorbents from the coking waste water could meet with Langmuir isothermy equation and the adsorption value would be increased with the temperature increased. The false secondary equation could well state the COD adsorption behaviors of the two sorbents. The static dynamic data results meet the diffusion equation of the liquid mem- brane and the diffusion of the liquid membrane would be the main procedure of the adsorption process. The dynamic adsorption and de- sorption study showed that when the adsorption velocity was 10 BV/h, the COD penetrated adsorption value and saturated adsorption value of the S-AC （KOH） would be 11.75 mg/mL and 13.54 mg/mL individually. The COD penetrated adsorption value and saturated adsorption value of S-AC （ZnC12） would be 12.46 mg/mL and 14. 53 mg/mL individually. The quality fraction with 5% NaOH would be desorpfion agent and when the desorption velocity was 5 BV/h, the desorption rate of the sorbent could reach to over 90%.
出处
《煤炭科学技术》
CAS
北大核心
2010年第4期115-120,共6页
Coal Science and Technology
关键词
污泥活性炭
COD
吸附
脱附
焦化废水
sewage sludge activated carbon
COD
adsorption
desorption
coking waste water
