A novel fragmented anode biofilm microbial fuel cell (FAB–MFC) integrated system for domestic wastewater treatment and bioelectricity generation

Abstract Background The critical MFC design challenge is to increase anode surface area. A novel FAB–MFC integrated system was developed and evaluated for domestic wastewater treatment. It was operated in fed-batch flow mode at 1–3 days of HRT with 755 mg/L CODIN and 0.76 kg-COD/m3/day. The study includes anaerobic-MFC and aerobic-MFC integrated systems. Microbial electrode jacket dish (MEJ-dish) with hybrid dimension (HD) was invented, first time to authors’ knowledge, to boost anode biofilm growth. The treatment system with MEJ+ (FAB) and MEJ− (MFC) anode are called FAB–MFC and MFC, respectively. Results Fragmented variable anode biofilm thickness was observed in FAB than MFC. The FAB–MFC (FAB+) simple technique increases the anode biofilm thickness by ~ 5 times MFC. Due to HD the anode biofilm was fragmented in FAB+ system than MFC. At the end of each treatment cycle, voltage drops. All FAB+ integrated systems reduced voltage drop relative to MFC. FAB reduces voltage drops better than MFC in anaerobic-MFC from 6 to 20 mV and aerobic-MFC from 35–47 mV at 1 kΩ external load. The highest power density was achieved by FAB in anaerobic-MFC (FAB = 104 mW/m2, MFC = 98 mW/m2) and aerobic-MFC integrated system (FAB = 59 mW/m2, MFC = 42 mW/m2). Conclusions The ∆COD and CE between FAB and MFC could not be concluded because both setups were inserted in the same reactor. The integrated system COD removal (78–97%) was higher than the solitary MFC treatment (68–78%). This study findings support the FAB+ integrated system could be applied for real applications and improve performance. However, it might depend on influent COD, the microbial nature, and ∆COD in FAB+ and MFC, which requires further study. Graphic abstract

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Impact of Operational Condition on the Membrane Permeate Flux and Quality of Domestic Wastewater Treatment using Hollow Fiber Membrane Module in Cross-Flow Mode

Journal of Chemical Engineering Research Updates ◽

10.15377/2409-983x.2018.05.1 ◽

2018 ◽

Vol 5 (1) ◽

pp. 1-9

Author(s):

Zhan Wang ◽

Keyword(s):

Wastewater Treatment ◽

Hollow Fiber ◽

Hollow Fiber Membrane ◽

Cross Flow ◽

Domestic Wastewater ◽

Flow Mode ◽

Permeate Flux ◽

Fiber Membrane ◽

Domestic Wastewater Treatment

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Evaluation of the efficiency of an integrated biofilm and phytoremediation system with Nasturtium officinale for the treatment of municipal wastewater in Huancavelica

TAYACAJA ◽

10.46908/tayacaja.v4i2.168 ◽

2021 ◽

Vol 4 (2) ◽

pp. 22-28

Author(s):

Adiel Álvarez Ticllasuca ◽

Marco Curasma Matamoros ◽

Estefani Sandoval Condori ◽

Fernando Toribio Román

Keyword(s):

Wastewater Treatment ◽

Removal Efficiency ◽

Municipal Wastewater ◽

Wastewater Treatment Plants ◽

Domestic Wastewater ◽

Pollutant Removal ◽

Integrated System ◽

Fecal Coliforms ◽

Nasturtium Officinale ◽

Domestic Wastewater Treatment

In this research removal efficiency was evaluated of organic pollutants of a biofilm and phytoremediation integrated system for municipal wastewater treatment in Huancavelica. A pilot plant consisting of a settler was installed that also retained oils and fats, a biological filter using as support material the calcareous stuff and a phytoremediation process with Nasturtium officinale (watercress) The hydraulic retention time was 5.5 hours and the flowrate of 0.011 L s -1, the evaluation was made of the proper functioning of processes by monitoring control parameters. The pollutant removal efficiency was determined by Student's "t" test (p <0.05). An average pH value of 7.57 and a temperature of 12.07 ° C were obtained, subsequently the measurement of BOD5 was initiated, obtaining maximum effluent values of 131 ppm and minimum values of 45 ppm and a removal efficiency of 44.8% was obtained, for COD. In total coliforms, fecal coliforms and Escherichia coli the removal was 66.67%, 94.59%, 81.22% and 72.12% respectively, oil and fat analysis was also performed and total suspended solids, however high removal efficiency was not obtained. It is concluded that the parameters of BOD5 and COD comply with the MPL for the effluents of municipal domestic wastewater treatment plants, while the rest of the parameters analyzed do not comply with the regulations. however high removal efficiency was not obtained. It is concluded that the parameters of BOD5 and COD comply with the MPL for the effluents of municipal domestic wastewater treatment plants, while the rest of the parameters analyzed do not comply with the regulations. however high removal efficiency was not obtained. It is concluded that the parameters of BOD5 and COD comply with the MPL for the effluents of municipal domestic wastewater treatment plants, while the rest of the parameters analyzed do not comply with the regulations.

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Domestic wastewater treatment by forward osmosis-membrane distillation (FO-MD) integrated system

Water Science & Technology ◽

10.2166/wst.2018.031 ◽

2018 ◽

Vol 77 (6) ◽

pp. 1514-1523 ◽

Cited By ~ 11

Author(s):

Jie Li ◽

Deyin Hou ◽

Kuiling Li ◽

Yong Zhang ◽

Jun Wang ◽

...

Keyword(s):

Molecular Weight ◽

Wastewater Treatment ◽

Membrane Fouling ◽

Forward Osmosis ◽

Domestic Wastewater ◽

Membrane Distillation ◽

Integrated System ◽

Water Yield ◽

Separation Performance ◽

Domestic Wastewater Treatment

Abstract In this study, real domestic wastewater treatment by forward osmosis-membrane distillation (FO-MD) integrated system was investigated in laboratory scale. The integrated membrane system presented a good separation performance and the removal efficiency of most contaminants in the domestic wastewater was higher than 90%. High molecular weight contaminants were completely removed, while a few low molecular weight contaminants permeated through the membrane. The FO membrane fouling layer mainly consisted of organic substances like polysaccharides and proteins, and was very loose and could be effectively removed by rinsing the membrane surface with tap water. By comparison, the MD membrane fouling was mainly induced by inorganic salts and was not as severe as that of the FO membrane. During 120 h continuous operation, the FO-MD integrated system exhibited satisfying performance stability and maintained a high water yield and high product water quality. The results indicated the potential of the FO-MD integrated system for municipal wastewater treatment in coastal cities, water purification and desalination.

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