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Frontiers of Environmental Science & Engineering

Front. Environ. Sci. Eng.    2017, Vol. 11 Issue (6) : 6
Impact of food to microorganism ratio and alcohol ethoxylate dosage on methane production in treatment of low-strength wastewater by a submerged anaerobic membrane bioreactor
Yulun Nie1,2, Xike Tian1(), Zhaoxin Zhou1, Yu-You Li2()
1. Faculty of Material Science and Chemistry, China University of Geosciences, Wuhan 430074, China
2. Department of Civil and Environmental Engineering, Graduate School of Engineering, Tohoku University, 6-6-06 Aza-Aoba, Aramaki, Aoba-ku, Sendai, Miyagi 980-8579, Japan
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Efficient methane recovery was obtained when the F/M ratio was below 0.357.

AE was efficiently degraded and converted into CH 4 by anaerobic microbes.

Microbe could cope with the stress of AE by producing more EPS and SMP.

F/M ratio of 1.054 decrease the methane production potential significantly.

The methane production activity of sludge was inhibited at a higher AE dosage.

The effects of food to microorganism (F/M) ratio and alcohol ethoxylate (AE) dosage on the methane production potential were investigated in treatment of low-strength wastewater by a submerged anaerobic membrane bioreactor (SAnMBR). The fate of AE and its acute and/or chronic impact on the anaerobic microbes were also analyzed. The results indicated that AE had an inhibitory effect to methane production potential (lag-time depends on the AE dosage) and the negative effect attenuated subsequently and methane production could recover at F/M ratio of 0.088–0.357. VFA measurement proved that AE was degraded into small molecular organic acids and then converted into methane at lower F/M ratio (F/M<0.158). After long-term acclimation, anaerobic microbe could cope with the stress of AE by producing more EPS (extracellular polymeric substances) and SMP (soluble microbial products) due to its self-protection behavior and then enhance its tolerance ability. However, the methane production potential was considerably decreased when AE was present in wastewater at a higher F/M ratio of 1.054. Higher AE amount and F/M ratio may destroy the cell structure of microbe, which lead to the decrease of methane production activity of sludge and methane production potential.

Keywords Anaerobic membrane bioreactor AnMBR      F/M ratio      Surfactant      Wastewater      Methane production      Influence     
Corresponding Authors: Xike Tian,Yu-You Li   
Issue Date: 11 May 2017
 Cite this article:   
Yulun Nie,Xike Tian,Zhaoxin Zhou, et al. Impact of food to microorganism ratio and alcohol ethoxylate dosage on methane production in treatment of low-strength wastewater by a submerged anaerobic membrane bioreactor[J]. Front. Environ. Sci. Eng., 2017, 11(6): 6.
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Yulun Nie
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Zhaoxin Zhou
Yu-You Li
Fig.1  Effect of AE dosage on AnMBR performance in terms of COD removal, biogas production, AE removal and sludge concentration
Fig.2  Measured (dot) and estimated (line) methane production at different F/M ratios and AE concentrations in the course of duration time by batch experiments
Fig.3  Effect of F/M ratio and AE presence on the methane recovery efficiency
Fig.4  AE degradation in batch experiment at different F/M ratios
Fig.5  Measured (dot) and estimated (line) methane production only fermentation of different AE concentrations
Fig.6  Net cumulative methane production only at different AE concentrations
Fig.7  Effect of AE dosage on SMP and EPS concentration changes and the corresponding ratio of P/C at a F/M ratio of 1.054
Fig.8  Effect of AE dosage on the measured (dot) and estimated (line) MPA of sludge before and after long-term acclimation
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