Investigation of filtration performance and phosphorus removal in an electric field controlled dynamic membrane bioreactor

Chen, Long; Lv, Miao; Ding, Yang-Cheng; Lv, Zi-Ang; Ding, Dan-Na; Wu, Di; Yuan, Haiping; Zhu, Nanwen; Feng, Hua-Jun

doi:10.1016/j.cej.2023.147328

Cited by 5 publications

(1 citation statement)

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“…To achieve solid-liquid separation, a cake layer generated on the surface of the coarse porous material was known as the dynamic membrane (DM). As a result, a low-cost, low-energy dynamic membrane bioreactor (DMBR) was developed [15][16][17]. The pore size of coarse porous materials ranged from 10 to 200 um [18].…”

Section: Introductionmentioning

confidence: 99%

Performance of a Double-Filter-Medium Tandem Membrane Bioreactor with Low Operating Costs in Domestic Wastewater Treatment

Liu,

Li,

Zhao

et al. 2024

Water

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To reduce the operating costs of conventional membrane bioreactors (MBRs) and improve the stability and quality of the dynamic membrane bioreactor (DMBR) effluent, a homemade inexpensive filter cloth assembly was connected to an up-flow ultra-lightweight-medium filter (UUF) in lieu of expensive membrane modules to form a double-filter-medium tandem (DT)-MBR. DT-MBR was used to treat domestic wastewater, and its removal efficiencies for chemical oxygen demand, ammonia nitrogen, total nitrogen, and total phosphorus were similar to those of aerobic MBR, with average removal rates of 91.1%, 98.4%, 15.1%, and 50.7%, respectively. The average suspended solid (SS) of the final effluent was 5.6 mg∙L−1, and the filter cloth assembly played a leading role in SS removal, with an average removal rate of 86.0% and a relatively stable removal effect with little impact via backwashing. The activated sludge zeta potential, flocculation and sedimentation properties, particle size distribution, microbial compositions, extracellular polymeric substances (EPS), and filtration resistance of the cake layer were analyzed; it was found that the cake layer, which can also be called the dynamic membrane (DM), had an excellent filtration performance. However, the DM theory could not reasonably explain why the effluent quality of the filter cloth assembly maintained good stability even after backwashing. The real reason must be related to the sieving of cloth pores. Therefore, the concept of an in situ autogenous static membrane (ISASM) was proposed. With low operating costs and good and stable effluent quality, DT-MBR is a desirable alternative to the traditional MBR.

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