方波函数式进料对膜污染影响研究
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摘要
采用方波函数式进料,通过在膜组件入口处增设函数控制器控制料液在膜内呈现周期性流动。与连续稳定流体进料相比,方波函数式进料膜通量下降的速率低。在占空时间9 s运行4 s时膜比通量最大,在过滤1 h后仍能保持在0. 85以上,很大程度上提高膜通量,减轻了膜污染。过滤前后料液的浊度分别为3. 18 NTU及0. 145 NTU,说明超滤膜对污水中的悬浮颗粒物质有极好的截留作用。将膜丝进行扫面电镜测试表明,函数进料处理后膜截面仍然光滑,膜表面沾附有细小颗粒,但没有产生滤饼层。
Square wave functional feed was used to control the liquid to flow periodically in the membrane by installing a function controller before membrane module. Compared with steady flow feed,the membrane flux of square wave function decreased at a lower rate. The membrane flux was the highest when the space time was 9 s and running time was 4 s. It kept above 0. 85 after filtering 1 h. The membrane flux was increased significantly and the membrane fouling was reduced. The turbidity of the feed liquid before and after filtration was 3. 18 NTU and 0. 145 NTU,respectively,indicating that ultrafiltration membrane had excellent interceping effect on suspended particulates in sewage. Scanning electron microscopy( SEM) was used to characterize the morphology of the membrane. The results showed that the cross section of the membrane were still smooth after the function feeding treatment. There were some small particles coated on the surface of the membrane and cake layer was not observed.
Square wave functional feed was used to control the liquid to flow periodically in the membrane by installing a function controller before membrane module. Compared with steady flow feed,the membrane flux of square wave function decreased at a lower rate. The membrane flux was the highest when the space time was 9 s and running time was 4 s. It kept above 0. 85 after filtering 1 h. The membrane flux was increased significantly and the membrane fouling was reduced. The turbidity of the feed liquid before and after filtration was 3. 18 NTU and 0. 145 NTU,respectively,indicating that ultrafiltration membrane had excellent interceping effect on suspended particulates in sewage. Scanning electron microscopy( SEM) was used to characterize the morphology of the membrane. The results showed that the cross section of the membrane were still smooth after the function feeding treatment. There were some small particles coated on the surface of the membrane and cake layer was not observed.
引文
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[14]郑武,于萍.吸附预处理减缓微滤膜污染试验研究[J].四川大学学报(自然科学版),2018(6):1265-1269.
[15]赵鹏.超滤膜的清洗及污染防控[J].化工环保,2018,38(3):333-337.
[16] Watabe T,Takahashi T,Matsuyama K,et al. Effect of the addition of fine bubbles on reversible and irreversible membrane fouling in surface water treatment[J]. Desalination and Water Treatment,2017,78:12-18.
[17] Abid H S,Johnsona D J,Hashaikehb R,et al. A review of efforts to reduce membrane fouling by control of feed spacer characteristics[J].Desalination,2017,420:382-402.
[2]张耀宗,王启山,丁莎莎,等.超滤膜处理地表水过程中膜污染的研究进展[J].水处理技术,2009,35(11):12-16.
[3] Dhakal N,Salinas-Rodrigue S G,Ouda A,et al. Fouling of ultra?叢ltration membranes by organic matter generated by marine algal species[J]. Journal of Membrane Science,2018,555:418-428.
[4]孟晓荣,张海珍,王磊,等.城市污水二级出水超滤膜污染与膜特性的研究[J].环境科学,2013,34(5):1822-1827.
[5]王利颖,石洁,王凯伦,等.碳纳米管改性PVDF中空纤维超滤膜处理二级出水抗污染性能研究[J].环境科学,2017,38(1):220-228.
[6]彭婷,史载锋,林强,等. PVC超滤膜处理生活污水及膜污染控制研究[J].膜科学与技术,2015,35(2):75-81.
[7]刘冲,吕晓龙,武春瑞,等.用于控制膜污染的新型泄压式脉冲工艺研究[J].水处理技术,2016,42(9):97-100.
[8]李晨,张大帅,吴迪,等.流体流动形态对膜污染影响的研究进展[J].海南师范大学学报(自然科学版),2018,31(3):270-275.
[9] Shi Z F,Li C,Peng T,et al. CFD modeling and experimental study of pulse flow in a hollow fiber membrane for water filtration[J].Desalination and Water Treatment,2017,79:9-18.
[10]赵从珏,谭浩强,衣雪松.超滤膜污染的成因与防控研究进展[J].中国资源综合利用,2011,29(7):17-20.
[11]李行,陆海伟,黄河清.超滤膜污染与清洗的研究进展[J].广东化工,2018,45(22):86-87.
[12]鄢忠森,瞿芳术,梁恒,等.超滤膜污染以及膜前预处理技术研究进展[J].膜科学与技术,2014,34(4):108-114,127.
[13]刘冲,吕晓龙,武春瑞,等.关于超滤膜临界运行通量的探讨[J].膜科学与技术,2017,37(1):23-26,43.
[14]郑武,于萍.吸附预处理减缓微滤膜污染试验研究[J].四川大学学报(自然科学版),2018(6):1265-1269.
[15]赵鹏.超滤膜的清洗及污染防控[J].化工环保,2018,38(3):333-337.
[16] Watabe T,Takahashi T,Matsuyama K,et al. Effect of the addition of fine bubbles on reversible and irreversible membrane fouling in surface water treatment[J]. Desalination and Water Treatment,2017,78:12-18.
[17] Abid H S,Johnsona D J,Hashaikehb R,et al. A review of efforts to reduce membrane fouling by control of feed spacer characteristics[J].Desalination,2017,420:382-402.
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