多级冷冻工艺对高盐高浓度有机废水的处理效果及去除机理  

Treatment performance and mechanism of high-salt and high-concentration organic wastewater using multi-stage freezing technology

作　　者：李晓洋 崔康平[1] 席慕凡 徐凯杰 郭志 陈奕涵 许为义[1] LI Xiaoyang;CUI Kangping;XI Mufan;XU Kaijie;GUO Zhi;CHEN Yihan;XU Weiyi(College of Resources and Environmental Engineering,Hefei University of Technology,Hefei 230009,China)

机构地区：[1]合肥工业大学资源与环境工程学院,合肥230009

出　　处：《环境工程学报》2020年第3期652-661,共10页Chinese Journal of Environmental Engineering

摘　　要：探索了冷冻结晶工艺去除高盐高浓度模拟有机废水的影响因素,将多级冷冻工艺应用于模拟废水和实际废水。结果表明:在其他因素固定的条件下,结冰率越高,有机物去除率和脱盐率就越低;冷冻温度越低,有机物去除率和脱盐率越低;有机物去除率和脱盐率随初始盐浓度或初始COD的增大而降低;冷冻接触面积越大,有机物去除率和脱盐率越高。初始COD为8000.0 mg·L^-1,初始盐浓度为8000.0 mg·L^-1的模拟废水在4级冷冻后,COD和含盐量分别降低至240.0 mg·L^-1和516.9 mg·L^-1,去除率分别为97.0%和93.5%。初始COD为55690.0 mg·L^-1,初始盐浓度为54648.9 mg·L^-1(以NaCl计)的实际化工废水在经过6级冷冻处理后,COD和含盐量分别降低至491.3 mg·L^-1和983.3 mg·L^-1,有机物去除率为99.1%,脱盐率为98.2%,可达到市政管网的接管要求。上述研究结果为高盐高浓度有机废水的处理提供了新的解决方案。In this study,the factors affecting the treatment of simulated high-salt and high-concentration organic wastewater by freezing technique were firstly explored,and the multi-stage freezing method was used to treat the simulated and actual wastewater.The results showed that when other factors were fixed,the higher the icing rate was,the lower the removal efficiencies of organic and salinity were,the lower the freezing temperature was,the lower the removal efficiencies of organic and salinity were,the removal efficiencies of organic and salinity decreased with the increase of the initial salt concentration or COD value,the larger the frozen contact area was,the higher the removal efficiencies of organic and salinity were.For the simulated wastewater with initial COD of 8000.0 mg·L^-1 and initial salt concentration of 8000.0 mg·L^-1,four-stage freezing could reduce COD and salt content to 240.0 mg·L^-1 and 516.9 mg·L^-1,respectively,and the corresponding removal efficiencies were 97.0% and 93.5%.For the actual chemical wastewater with initial COD of 55690.0 mg·L^-1 and initial salt concentration of 54648.9 mg·L^-1(as NaCl),six-stage freezing could reduce COD and salt content to 491.3 mg·L^-1 and 983 mg·L^-1,respectively,and the corresponding removal efficiencies were 99.12% and 98.20%,which could meet the requirements of municipal pipe network.This study provides a new way for the treatment of high salt and high concentration organic wastewater.

关 键 词：多级冷冻法 脱盐 有机物 模拟废水 化工废水 去除机理 

分 类 号：X703[环境科学与工程—环境工程]