活化时间对加氢半焦气化废水吸附性能的影响

发布时间：2019-02-12 20:02

【摘要】：以加氢半焦为原料,利用下落床和固定床装置,高温水蒸气活化直接制得廉价的活性焦,并对其进行高浓度和低浓度气化废水处理实验.在优化的制备条件下,分别考察了活化时间对活性焦吸附指标和废水吸附性能的影响.结果表明:随着活化时间由5s增加到120min,所制备活性焦的苯酚吸附值和碘值先增加后略微下降,总比表面和总孔容增加.未活化的加氢半焦吸附指标较低且废水吸附效果较差.采用下落床活化,活化时间为5s时,活性焦吸附性能提高不明显;而采用固定床活化,活性焦吸附性能明显提高.当活化时间为90min时,活性焦的苯酚吸附值和碘值达到最大值,分别为97mg/L和588mg/L,总比表面积和总孔容分别可达675.53m2/g和0.631 2cm3/g.当活化时间30min时,自制活性焦对高低浓度气化废水中COD、总磷、TOC的去除率和吸附容量与市售活性焦相近,而活化时间在30min~120min范围内变动导致COD、总磷、TOC的去除率和吸附容量变化范围均5%,活化时间对高低浓度气化废水中COD、总磷、TOC的去除率和吸附容量均影响不大.
[Abstract]:Low cost active coke was prepared from hydrogenated semi-coke by using falling bed and fixed bed device. The treatment of high concentration and low concentration gasification wastewater was carried out. Under the optimized preparation conditions, the effects of activation time on the adsorption index of activated coke and adsorption performance of wastewater were investigated. The results showed that with the increase of activation time from 5 s to 120 min, the phenol adsorption value and iodine value of the prepared active coke firstly increased and then decreased slightly, and the total specific surface and total pore volume increased. The adsorption index of unactivated hydrogenated semi-coke is low and the adsorption efficiency of wastewater is poor. When activated by falling bed, the adsorbability of activated coke was not improved obviously when activation time was 5 s, but that of activated coke with fixed bed was improved obviously. When the activation time is 90min, the phenol adsorption value and iodine value of activated coke reach the maximum value, which are 97mg/L and 588mg / L, respectively. The total specific surface area and total pore volume are up to 675.53m2/g and 0.631 cm ~ 3 / g, respectively. When the activation time is 30min, the removal rate and adsorption capacity of COD, in high and low concentration gasification wastewater from activated coke are similar to those of commercial activated coke. However, the change of activation time in the range of 30min~120min leads to the total phosphorus of COD,. The range of TOC removal rate and adsorption capacity is 5, and activation time has little effect on COD, total phosphorus, TOC removal rate and adsorption capacity in high and low concentration gasification wastewater.
【作者单位】：新奥科技发展有限公司煤基低碳能源国家重点实验室;山东大学燃煤污染物减排国家工程实验室;
【基金】：国家高技术研究发展计划(863)项目(2011AA05A201)
【分类号】：O647.3;X784

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