氢氧化钙催化聚糖改善甲醛废水的生化性研究  

Biodegradability Improvement of Formaldehyde-containing Wastewater with Ca(OH)_(2) Catalyzed Formose Reaction

作　　者：孙祥 生亚琴 Sun Xiang;Sheng Yaqin(Jiangsu Yangnong Kumho Chemical Co.,Ltd.,Jiangsu,211900)

机构地区：[1]江苏扬农锦湖化工有限公司,江苏211900

出　　处：《当代化工研究》2022年第6期4-8,共5页Modern Chemical Research

摘　　要：研究了反应条件(pH值和温度)对甲醛聚糖反应过程的影响,同时分析了反应过程中甲醛、多糖浓度和分子量(总糖和溶解性糖)的变化特征。结果显示,反应过程中溶液颜色变为黄色,颜色变化时多糖浓度达到最大。此时,甲醛去除率达99%以上,剩余甲醛浓度约1-2mg/L,多糖浓度达到最高点。蒽酮比色法和分子量分析显示颜色变化后,聚糖反应并未终止,多糖形态不断变化。另外,好氧批示生物测试分析显示,甲醛溶液的生化性随着聚糖反应时间的延长而持续改善,1天生物氧化对COD去除率可达50%,说明采用氢氧化钙催化聚糖反应改善甲醛废水的生化性是可行的。This study investigated the effect of reactions conditions(pH and temperature)on formose reaction and analyzed the dynamic vari-ation in concentration of formaldehyde and saccharide(total and soluble saccharide)during reaction.The result indicated that the color of reaction solution turned to yellow,and meanwhile the polysaccharide concentration reached the maximum.At the same time,more than 99%of formaldehyde was removed after formose reaction,the concentration residual of formaldehyde was 1-2mg/L.Anthrone colorimetry and molecular weight analysis revealed that formose reaction didn’t stop at color changing point,the speciation of saccharide was highly changeable.In addition,acc ording to aer-obic batch bioassay,the biodegradability of formaldehyde solution was continually improved with extension of reaction time.The COD removal rate was more than 85%after 5 days of biooxidation,indicating that it is feasible to use formose reaction as a pretreatment step for formaldehyde-contain-ing wastewater purification.

关 键 词：甲醛 聚糖反应 生化性 Ca(OH)_(2) 动力学 

分 类 号：TQ[化学工程]