Investigate the simultaneous effect of pH, temperature, and hydraulic retention time in moving bed biofilm reactor: optimization and modeling using response surface methodology

Abstract A membrane bioreactor (MBR) and a hybrid moving bed biofilm reactor-membrane bioreactor (hybrid MBBR-MBR) for municipal wastewater treatment were studied to determine the effect of salinity on nitrogen removal and autotrophic kinetics. The biological systems were analyzed during the start-up phase with a hydraulic retention time (HRT) of 6 h, total biomass concentration of 2,500 mg L−1 in the steady state, and electric conductivities of 1.05 mS cm−1 for MBR and hybrid MBBR-MBR working under regular salinity and conductivity variations of 1.2–6.5 mS cm−1 for MBR and hybrid MBBR-MBR operating at variable salinity. The variable salinity affected the autotrophic biomass, which caused a reduction of the nitrogen degradation rate, an increase of time to remove ammonium from municipal wastewater and longer duration of the start-up phase for the MBR and hybrid MBBR-MBR.

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Effect of Hydraulic Retention Time on the Performance of a Compact Moving Bed Biofilm Reactor for Effluent Polishing of Treated Sewage

Water ◽

10.3390/w14010081 ◽

2022 ◽

Vol 14 (1) ◽

pp. 81

Author(s):

Jamal Ali Kawan ◽

Fatihah Suja’ ◽

Sagor Kumar Pramanik ◽

Arij Yusof ◽

Rakmi Abdul Rahman ◽

...

Keyword(s):

Water Resource ◽

Retention Time ◽

Hydraulic Retention Time ◽

Treatment Plant ◽

Biofilm Reactor ◽

Moving Bed Biofilm Reactor ◽

Moving Bed ◽

Treated Effluent ◽

Treated Sewage ◽

Working Volume

Treated effluent from a wastewater treatment plant can be further reused as a water resource for a water supply treatment plant. In this case, the treated sewage gathered in the study of the Class V National Water Quality Standard (NWQS) of Malaysia would be treated for use as a water resource for a water treatment plant. In a moving bed biofilm reactor (MBBR) with a 500-L working volume, organic pollutants, undesirable nutrients, and bacteria were removed without disinfectant. At 24-h hydraulic retention time (HRT), the maximum removal efficiency of 5-day biological oxygen demand, ammonia–nitrogen (NH3-N), and total phosphorus were 71%, 48%, and 12%, respectively. The biofilm thickness, which was captured using scanning electron microscopy, increased from 102.6 μm (24-h HRT) to 297.1 μm (2-h HRT). A metagenomic analysis using 16S rRNA showed an abundance of anaerobic bacteria, especially from the Proteobacteria phylum, which made up almost 53% of the total microbes. MBBR operated at 24-h HRT could improve effluent quality, as its characteristics fell into Class IIA of the NWQS of Malaysia, with the exception of the NH3-N content, which indicated that the effluent needed conventional treatment prior to being reused as potable water.

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Upgrading to nitrogen removal with the kmt moving bed biofilm process

Water Science & Technology ◽

10.2166/wst.1994.0608 ◽

1994 ◽

Vol 29 (12) ◽

pp. 185-195 ◽

Cited By ~ 27

Author(s):

Bjørn Rusten ◽

Jon G. Siljudalen ◽

Bjørnar Nordeidet

Keyword(s):

Carbon Source ◽

Nitrogen Removal ◽

Retention Time ◽

Mechanical Treatment ◽

Hydraulic Retention Time ◽

Biofilm Reactor ◽

Moving Bed Biofilm Reactor ◽

Moving Bed ◽

Biofilm Process ◽

Full Scale Tests

A new moving bed biofilm reactor (MBBR) has been developed in Norway. The biomass is attached to carrier elements that move freely along with the water in the reactor. It has been demonstrated that existing, high loaded, activated sludge plants can easily be upgraded to nitrogen removing MBBR plants. With chemically enhanced mechanical treatment, full scale tests showed that 80-90% total nitrogen could be removed in a MBBR plant at a total empty bed hydraulic retention time (HRT) of 2.6 hours. The plant was operated in the post-denitrification mode, using methanol as an external carbon source.

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Optimizing nutrient removal of moving bed biofilm reactor process using response surface methodology

Bioresource Technology ◽

10.1016/j.biortech.2020.123059 ◽

2020 ◽

Vol 305 ◽

pp. 123059 ◽

Cited By ~ 6

Author(s):

Fares Almomani ◽

Rahul R. Bohsale

Keyword(s):

Response Surface Methodology ◽

Response Surface ◽

Nutrient Removal ◽

Biofilm Reactor ◽

Moving Bed Biofilm Reactor ◽

Moving Bed

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Evaluating the Effect of pH, Temperature, and Hydraulic Retention Time on Biological Sulphate Reduction Using Response Surface Methodology

Water ◽

10.3390/w12102662 ◽

2020 ◽

Vol 12 (10) ◽

pp. 2662

Author(s):

Mukhethwa Judy Mukwevho ◽

Dheepak Maharajh ◽

Evans M. Nkhalambayausi Chirwa

Keyword(s):

Response Surface Methodology ◽

Response Surface ◽

Retention Time ◽

Hydraulic Retention Time ◽

Mine Drainage ◽

Reduction Rate ◽

Sulphate Reduction ◽

Promising Alternative ◽

Effect Of Ph ◽

Independent Variables

Biological sulphate reduction (BSR) has been identified as a promising alternative for treating acid mine drainage. In this study, the effect of pH, temperature, and hydraulic retention time (HRT) on BSR was investigated. The Box–Behnken design was used to matrix independent variables, namely pH (4–6), temperature (10–30 °C), and HRT (2–7 days) with the sulphate reduction efficiency and sulphate reduction rate as response variables. Experiments were conducted in packed bed reactors operating in a downflow mode. Response surface methodology was used to statistically analyse the data and to develop statistical models that can be used to fully understand the individual effects and the interactions between the independent variables. The analysis of variance results showed that the data fitted the quadratic models well as confirmed by a non-significant lack of fit. The temperature and HRT effect were significant (p < 0.0001), and these two variables had a strong interaction. However, the influence of pH was insignificant (p > 0.05).

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