两性木素絮凝剂用于模拟染料废水的脱色处理研究

以木质素磺酸钙为原料制备了两性木素絮凝剂LSDC,并将LSDC用于活性艳蓝X-BR、活性黄X-R、活性紫K-3R、活性黑K-BR等多种模拟染料废水的脱色处理.讨论了LSDC投加量和溶液pH值对不同染料脱色效果的影响.实验结果说明,LSDC对各染料的脱色率在投加量0～150 mg/L范围内脱色率随投加量增大而增大,同时投加量增加可能引起废水CODCr的提高,需控制适当的投加量范围,在投加量不大时不会造成二次污染.染料所含活性基因数目和种类对脱色效果也有较大影响,对实验中涉及的几种活性染料,活性基团数目越多,絮凝脱色量越小.在pH 4～8的范围内,活性艳蓝X-BR、活性黄X-R、活性紫K-3R、活性黑K-BR的脱色率分别可达83.7%,99.39%,98.25%和82.13%.

Study on the Discoloration of Simulating Dye Effluemts with a Kind of Amphoteric Lignin-based Flocculant

The calcium lignosulphonate was adopted as the raw material to prepare the amphoteric lignin-based flocculant, denoted as LSDC. Then the LSDC was adopted to flocculate the different simulating dye effluents, e.g., reactive blue X-BR, reactive yellow X-R, reactive violet K-3R and reactive black K-BR. And, different flocculation effectors were optimized. It can be concluded that the flocculation efficiency of LSDC has found to be effluent pH and flocculant dose dependent. The discoloring rate increases with an increase in the LSDC dose ranging from 0 to 150 mg/L. However, CODCr of the simulating dye effluents also increases by addition of the LSDC. Consequently, the LSDC should be limited to a permissible dose. The LSDC contains the anionic sulfonic group and cationic quaternary ammonium group. Consequently, the kinds and number of the function groups on the dye molecular chains also showed great effect on the discoloring efficiency. For the reactive dyes, the discoloring flocculation capacities decreased with an increase of the numbers of the functional groups of the dyes. Among the effluent pH ranging from 4 to 8, the discoloring rates of the reactive blue X-BR, reactive yellow X-R, reactive violet K-3R and reactive black K-BR could reach 83.78%, 99.39%, 98.25% and 82.13%, respectively.