A pilot study of hybrid biological activated carbon (BAC) filtration-ultrafiltration process for water supply in rural areas: role of BAC pretreatment in alleviating membrane fouling†,Environmental Science: Water Research & Technology

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A pilot study of hybrid biological activated carbon (BAC) filtration-ultrafiltration process for water supply in rural areas: role of BAC pretreatment in alleviating membrane fouling†
Environmental Science: Water Research & Technology ( IF 3.5 ) Pub Date : 2017-12-12 00:00:00 , DOI: 10.1039/c7ew00381a
Fangshu Qu _{1,

2,

3,

4} , Zhongsen Yan _{1,

2,

3,

4} , Hao Wang _{1,

2,

3,

4} , Xiaobo Wang _{1,

2,

3,

4} , Heng Liang _{1,

2,

3,

4} , Huarong Yu _{1,

2,

3,

4} , Junguo He _{1,

2,

3,

4} , Guibai Li _{1,

2,

3,

4}

Affiliation

For decentralized drinking water treatment in rural areas, a hybrid process of biological activated carbon (BAC) filtration and ultrafiltration (UF) was applied to obtain potable water. A pilot-scale study was performed by comparing BAC-UF and UF, and bench-scale experiments were also conducted to investigate the effect of BAC pretreatment on membrane fouling in UF. The performances of pilot scale BAC-UF and UF were continuously monitored for 130 days. BAC-UF performed better than UF in terms of dissolved organic matter (DOM) and ammonia removal. BAC pretreatment significantly alleviated membrane fouling in the subsequent UF. Besides reducing the organic loading that entered into the UF, BAC pretreatment also changed the quality of the DOM. BAC pretreatment shifted the major fluorescence foulants from fulvic and humic acid-like substances in the raw water to protein-like substances in the BAC effluent, and increased the apparent molecular weight of dissolved organics. Bench-scale UF tests showed that the BAC pretreatment reduced both reversible and irreversible fouling. Fouling mechanism analysis indicated that cake layer formation instead of pore blocking dominated fouling in UF with BAC pretreatment, which resulted in alleviated flux decline and higher stabilized flux. These results indicate that the changes in both the quantity and quality of DOM enabled by BAC pretreatment contributed to the retardation of flux decline and the increase in stabilized flux in BAF-UF.

中文翻译：

混合生物活性炭（BAC）过滤-超滤过程用于农村地区供水的中试研究：BAC预处理在减轻膜污染中的作用†

对于农村地区的分散式饮用水处理，采用了生物活性炭（BAC）过滤和超滤（UF）的混合工艺来获得饮用水。通过比较BAC-UF和UF进行了中试规模的研究，还进行了台式规模的实验以研究BAC预处理对UF中膜污染的影响。连续监控了中试规模的BAC-UF和UF的性能，持续了130天。就溶解性有机物（DOM）和氨气去除而言，BAC-UF的性能优于UF。BAC预处理显着减轻了后续超滤中的膜污染。除了减少进入超滤的有机负荷外，BAC预处理还改变了DOM的质量。BAC预处理将主要的荧光污垢物从原水中的黄腐酸和腐殖酸样物质转移到BAC废水中的蛋白质样物质，并增加了溶解有机物的表观分子量。台式超滤测试表明，BAC预处理可减少可逆和不可逆结垢。结垢机理分析表明，采用BAC预处理后，UF中的饼层形成而非孔阻塞成为主要结垢，从而减轻了通量的下降并提高了稳定通量。这些结果表明，通过BAC预处理可以使DOM的数量和质量发生变化，从而导致BAF-UF中通量下降的延迟和稳定通量的增加。并增加了溶解有机物的表观分子量。台式超滤测试表明，BAC预处理可减少可逆和不可逆结垢。结垢机理分析表明，采用BAC预处理后，UF中的饼层形成而非孔阻塞成为主要结垢，从而减轻了通量的下降并提高了稳定通量。这些结果表明，通过BAC预处理可以使DOM的数量和质量发生变化，从而导致BAF-UF中通量下降的延迟和稳定通量的增加。并增加了溶解有机物的表观分子量。台式超滤测试表明，BAC预处理可减少可逆和不可逆结垢。结垢机理分析表明，采用BAC预处理后，UF中的饼层形成而非孔阻塞成为主要结垢，从而减轻了通量的下降并提高了稳定通量。这些结果表明，通过BAC预处理可以使DOM的数量和质量发生变化，从而导致BAF-UF中通量下降的延迟和稳定通量的增加。从而减轻了通量的下降并提高了稳定通量。这些结果表明，通过BAC预处理可以使DOM的数量和质量发生变化，从而导致BAF-UF中通量下降的延迟和稳定通量的增加。从而减轻了通量的下降并提高了稳定通量。这些结果表明，通过BAC预处理可以使DOM的数量和质量发生变化，从而导致BAF-UF中通量下降的延迟和稳定通量的增加。

更新日期：2017-12-12

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