Dynamic monitoring and proactive fouling management in a pilot scale gas-sparged anaerobic membrane bioreactor
Dynamic monitoring and proactive fouling management in a pilot scale gas-sparged anaerobic membrane bioreactor
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DOI：
10.1039/d0ew00608d
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发表时间：
2020-10
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影响因子：
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通讯作者：
Kahao Lim;P. Evans;J. Utter;M. Malki;P. Parameswaran
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作者：
Kahao Lim;P. Evans;J. Utter;M. Malki;P. Parameswaran
本研究考察了中试充气厌氧膜生物反应器（AnMBR）在其472天运行期内的膜性能数据，并通过膜解剖表征了污秽饼的成分。根据研究结论，在作业的前40天，平均渗透率为336±81 LMH / bar，下降了92%。虽然维护清洗最初是有效的，但其恢复渗透率的能力随着时间的推移而下降。浪费生物反应器固体似乎在恢复渗透性方面是有效的，而化学清洁是无法做到的。恢复机制似乎是胶体物质的减少，用半可溶性化学需氧量（ssCOD）来衡量，而不是生物反应器的总固体浓度。在AnMBR操作过程中使用荧光测定法进一步支持了这一观点，结果显示，在严重污染条件下，酪氨酸样化合物增加，这表明蛋白质物质对污染有很大影响。傅里叶变换红外光谱（FTIR）在膜解剖中证实了这一点。FTIR、x射线能谱扫描电镜和透射电镜对无机鳞屑进行了表征，主要发现磷酸盐和硫酸钙。从根本上描述污染物特征，并在AnMBR运行过程中引入新的动态监测参数，如ssCOD和荧光测定法，可以实现更有针对性的污染控制。
This study examines membrane performance data of a pilot-scale gas-sparged anaerobic membrane bioreactor (AnMBR) over its 472 day operational period and characterizes the foulant cake constituents through a membrane autopsy. The average permeability of 336 ± 81 LMH per bar during the first 40 days of operation decreased by 92% by the study's conclusion. While maintenance cleaning was effective initially, its ability to restore permeability decreased with time. Wasting bioreactor solids appeared to be effective in restoring permeability where chemical cleans were unable to. The restoration mechanism appears to be a decrease in colloidal material, measured by semi-soluble chemical oxygen demand (ssCOD), rather than bioreactor total solids concentration. This is further supported through the use of fluorometry during AnMBR operation, which showed an increase in tyrosine-like compounds during heavy fouling conditions, suggesting that proteinaceous materials have a large influence on fouling. This was corroborated during membrane autopsy using Fourier transform infrared spectroscopy (FTIR). FTIR, scanning electron microscopy with energy dispersive X-ray spectroscopy, and transmission electron microscopy were used to characterize inorganic scalants and predominantly found phosphate salts and calcium sulfate. Fundamentally characterizing foulants and introducing novel and dynamic monitoring parameters during AnMBR operation such as ssCOD and fluorometry can enable more targeted fouling control.