温度和构件共同强化排液的泡沫分离回收高浓度表面活性剂工艺

发布时间：2018-07-05 20:50

本文选题：泡沫分离 + 强化排液　；参考：《河北工业大学》2015年硕士论文

【摘要】：泡沫分离技术是回收水溶液中表面活性剂的一种有效的方法。然而当表面活性剂浓度接近或者超过其临界胶束浓度(CMC)时,富集比会迅速下降。因此本文开发了温度和构件共同强化排液的泡沫分离技术,利用此技术处理废水中高浓度的表面活性剂。本文首先研究了温度与螺旋构件共同强化排液处理废水中高浓度的表面活性剂十六烷基三甲基溴化铵(CTAB)。当CTAB浓度为1.55 g/L时,在温度为70℃、气体流量为50 m L/min、装液量为300 m L的条件下,CTAB的富集比仅为4.05。为了进一步提高CTAB富集比,研究了温度与椭球塔共同强化排液回收水溶液中高浓度CTAB和十二烷基苯磺酸钠(SDBS)。结果表明在温度为60℃、气体流量为100 m L/min、装液量为300 m L的条件下,CTAB的富集比为7.03,两级泡沫分离工艺得到总回收率为99.8%,消泡液和残液浓度分别为21.8 g/L和0.031 g/L,而SDBS经过同样条件下的两级泡沫分离处理以后消泡液浓度为34.2 g/L,残液浓度为0.154 g/L。虽然两级泡沫分离技术使消泡液的浓度得到很大提高,但是残液中表面活性剂浓度仍然很高,如果直接排放不但会污染环境而且会导致资源的浪费。所以本文研究了三级泡沫分离技术处理废水中最常见的阴离子高浓度表面活性剂SDBS,以进一步降低残液浓度。结果表明当第一级操作条件为SDBS溶液浓度为1.3 g/L,温度为60℃、气体流量为100 mL/min、装液量为300 mL、pH为7.2,第二级和第三级的温度分别为60℃和25℃,气速分别为170 m L/min和650 mL/min,此时富集比和回收率可达到26.3和99.0%。三级泡沫分离工艺最终消泡液浓度为34.2 g/L,而残液浓度减小至0.015g/L。
[Abstract]:Foam separation technology is an effective method for the recovery of surface active agents in aqueous solution. However, when the concentration of surfactant is close to or beyond the critical micelle concentration (CMC), the concentration ratio will decrease rapidly. Therefore, the foam separation technology with the common intensification of the temperature and components is developed in this paper, and the high concentration of the wastewater is treated by this technique. In this paper, a high concentration surface active agent, sixteen alkyl three methyl bromide (CTAB), is studied in this paper. When the concentration of CTAB is 1.55 g/L, at the temperature of 70 C, the gas flow rate is 50 m L/min and the loading amount is 300 m L, the concentration ratio of CTAB is only 4.05. in order to enter. The concentration ratio of CTAB was improved in one step. The high concentration CTAB and twelve alkylbenzene sulfonate (SDBS) were studied in the water solution of the joint enhancement of temperature and ellipsoidal tower. The results showed that the concentration ratio of CTAB was 7.03 and the total recovery of two stage foam separation process was 99.8% under the condition of temperature 60, 100 m L/min and 300 m L. The concentration of defoaming solution and residual liquid is 21.8 g/L and 0.031 g/L respectively, while the concentration of defoaming solution is 34.2 g/L after two stage foam separation under the same condition, and the concentration of residual liquid is 0.154 g/L., although the concentration of the foam separation solution is greatly improved by two stage foam separation technology, but the concentration of the surfactant in the residual liquid is still very high, if it is direct. Emissions not only pollute the environment but also lead to the waste of resources. Therefore, this paper studies the three stage foam separation technology to treat the most common high concentration surface active agent SDBS of the wastewater to further reduce the concentration of residual liquid. The results show that when the first stage operation condition is SDBS concentration is 1.3 g/L, the temperature is 60, and the gas flow is 100. ML/min, the loading amount is 300 mL, pH is 7.2, the temperature of grade second and third is 60 and 25, respectively, the gas velocity is 170 m L/min and 650 mL/min respectively. At this time, the concentration ratio and recovery rate can reach 26.3 and 99.0%. three foam separation process, the final defoaming solution concentration is 34.2 g/L, and the residual liquid concentration is reduced to 0.015g/L..
【学位授予单位】：河北工业大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：X703

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