Pilot study on saccharides recovery from sweet potato starch processing wastewater by combined process of ultrafiltration and nanofiltration
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摘要: 为了探究超滤（UF）+纳滤（NF）组合工艺回收甘薯淀粉加工废水中多糖的技术可行性,通过UF+NF双膜法中试实验,研究了操作压力、进水流量、运行时间对NF膜分离效果的影响,采用正交实验优化了NF膜清洗参数。结果表明:当操作压力为0.2 MPa、进水流量为550 L/h时,UF（60 ku）对蛋白截留率为94.1%。NF最佳运行条件为操作压力0.3 MPa、进水流量450 L/h,运行时间3 h,透过液多糖浓度低于4.8 mg/L,多糖、化学需氧量（COD）截留率分别为98%、85.2%。清洗剂种类、清洗剂浓度、清洗时间对NF膜清洗效果影响显著（p<0.01）,而清洗温度对NF膜清洗效果影响不显著（p>0.05）,影响程度大小顺序为清洗时间>清洗剂种类>清洗剂浓度>清洗温度;最优清洗参数时（温度30℃、清洗时间15 min、碱性蛋白酶浓度0.06%）,NF膜通量恢复率为92.1%。Abstract: The pilot scale test was carried out on the technical feasibility of polysaccharide recovery from sweet potato starch processing wastewater by combined process of ultrafiltration( UF) and nanofiltration( NF),concretely,the influence factors including operating pressure,influent flow,operating time on NF membrane separation effect were investigated and the cleaning parameters of NF membrane was optimized by orthogonal experiment. The UF membrane( 60 ku) was used as pretreatment and the removal ratio of protein was 94.1% with operating pressure of 0.2 MPa,influent flow of 550 L / h. The concentration of polysaccharide in NF membrane permeate was 4.8 mg / L as well as the rejection rate of polysaccharide and COD highly reached 98% and 85.2%respectively with operating pressure of 0.3 MPa,influent flow of 450 L / h,operation time of 3 h. Orthogonal experiment indicated that the cleaning time,the kind and concentration of cleaning agent would lead to an enhanced recovery rate of NF membrane flux( p < 0.01),however,the cleaning temperature had no significant effect( p > 0.05). According to significant degree of cleaning parameters impacted on recovery of NF membrane flux,it was sorted by cleaning time > kind of cleaning agent > concentration of cleaning agent > cleaning temperature.The recovery rate of NF membrane flux reached 92.1% under optimum conditions that the alkaline protease concentration was 0.06%,cleaning time was 15 min and the cleaning temperature was 30 ℃.
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Keywords:
- sweet potato processing wastewater /
- saccharide /
- nanofiltration /
- membrane cleaning
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