直接接触式膜蒸馏浓缩处理高浓度发酵废液效能  

Treatment of high organic concentration yeast wastewater by direct contact membrane distillation

作　　者：康昀 曲丹[1] 封莉[1] 程翔[1] 张立秋[1] 

机构地区：[1]北京林业大学环境科学与工程学院北京水体污染源控制技术重点实验室,北京100083

出　　处：《环境工程学报》2015年第12期5763-5768,共6页Chinese Journal of Environmental Engineering

基　　金：国家水体污染控制与治理科技重大专项(2013ZX07201007-003-01)

摘　　要：采用直接接触式膜蒸馏工艺(DCMD)浓缩处理高浓度发酵废液,在热侧温度65℃、冷侧温度30℃条件下,连续运行21 h,考察了浓缩过程中产水通量、产水侧COD和TOC浓度变化及蛋白质浓缩效果。结果表明,产水通量随运行时间延长而下降且降速较快,15 h内由17.1 kg/(m^2·h)降至8.9 kg/(m^2·h);经去离子水冲洗,产水通量可恢复至56.1%。产水中COD和TOC浓度随处理时间延长而不断增大。此外,原水与膜蒸馏出水中GC-MS分析结果也表明,随运行时间延长,原水中有更多种类的有机物进入产水侧,主要为挥发性有机物。对膜内表面进行扫描电镜-能谱(SEM-EDS)分析发现,膜内表面有块状沉积物出现,主要成分为有机物,含有少量的无机物。DCMD运行21 h后,废液体积浓缩8.3倍,有用组分蛋白质浓缩6.9倍,COD和TOC的去除率均达95%以上。In this study,direct contact membrane distillation（ DCMD） was used for the treatment of high concentration yeast wastewater. Commercial polypropylene hollow fiber membranes were evaluated by permeate flux and characteristic of permeate as well as membrane fouling. Experimental results showed that permeate flux decreased from 17. 1 kg/（ m^2·h） to 8. 9 kg/（ m^2·h） within 15 h DCMD performance. And permeate flux recovered 56. 1% after water rush. Permeate chemical oxygen demand（ COD） and total oxygen demand（ TOC）increased continuously,indicating that volatile organic component might transfer into the permeate side across micro pores. The gas chromatography-mass spectrometer（ GC-MS） analysis of permeate showed that the main content of volatile organics were trimethyl-pyrazine,2-acetyl pyrrole,phenethyl alcohol,phenylacetic acid and dibutyl phthalate. Deposits were found on the membrane surface via scanning electron microscope,which was the main reason for the flux decline. Energy dispersive spectrometer（ EDS） was dominated by organic fouling in combination with deposits of inorganic elements. The removal rates of COD,TOC and protein all reached to 95%.

关 键 词：发酵废液 膜蒸馏 产水通量 蛋白质 

分 类 号：X703[环境科学与工程—环境工程]