Responses of biofilm characteristics to variations in temperature and NH4+-N loading in a moving-bed biofilm reactor treating micro-polluted raw water

Zhang, Shuangfu; Wang, Yayi; He, Weitao; Wu, Min; Xing, Meiyan; Yang, Jian; Gao, Naiyun; Yin, Daqiang

doi:10.1016/j.biortech.2012.12.172

Cited by 75 publications

(29 citation statements)

References 31 publications

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“…Nevertheless, by using a same reactor without media under similar conditions, the standard of SDBS outlet for discharging into the surface water was not achieved for 100 and 200 mg/L of SDBS concentrations at 72 hours of HRT. It implied that the biomass attached as biofilm on the media surfaces played an important (9). However, when shifting the operation from the 72 hours HRT to 24 hours (by increasing the droplets from 1 mL/88 seconds to 1 mL/29 seconds, considering that each 15-16 droplets is equal to 1 mL) in zone D of Figure 4, degradation levels and COD removal of SDBS suddenly decreased to below 88% and 80%, respectively, for both MBBR and control reactors.…”

Section: Resultsmentioning

confidence: 99%

“…The microbial growth nutrient was prepared by mixing the nutrient solution and the synthetic wastewater, keeping the COD/N/P ratio close to 100:5:1 (9). The nutrient ingredients were K 2 HPO 4 , KH 2 PO 4 , NH 4 Cl, CaCO 3 , NaHCO 3, respectively 5, 15, 120, 10, and 10 grams, for each liter of tap water (11).…”

Section: Methodsmentioning

confidence: 99%

“…Among these methods, moving bed biofilm reactor (MBBR) is another biological process which uses suspended attached growth carriers (media) with specific weights less than water, helping them to be submerged during the process (8). MBBR has diverse advantages such as low sensitivity, easily achieving the mixed-liquor suspended solids (MLSS) of up to 12000 mg/L, requiring a very small area, no sludge recycle, high sludge age, and high expand-ability (9,10). According to other researchers who used MBBR for removing detergents (2), the media were natural stones without specific determined surfaces.…”

Section: Introductionmentioning

confidence: 99%

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Removal of Sodium Dodecylbenzene Sulfonate by Moving Bed Biofilm Reactor, Using Synthetic Media

2014

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Background: Detergents and difficulties of their presence in the water and wastewater cause various problems such as foam production, anomalies in the growth of algae, and accumulation and dispersion in aqueous environments. Objectives: The aim of this study was to examine and compare the moving bed biofilm reactor with another reactor without media (carries) for anionic surfactants removal. Materials and Methods: In this study, the media was from the 2H Company with specific surface of 535 m 2 /m 3 and the experiment reactor was made of a 4-mm plexiglass. The experiment was conducted by using two reactor, as one of them was without media, with exactly similar conditions to compare their operations. The standard method (MBAS) was used to measure the anionic surfactant. The concentrations of the examined anionic surfactant were 50, 100, 200, 300, and 400 mg/L in hydraulic retention times (HRTs) of 72, 24 and 8 hours. Results: The removal percentage for both reactors at 50 mg/L concentration of pollutant was same, but after gradually increasing the pollutant concentration and decreasing the HRT, the media-containing reactor had significant efficiency in comparison with the other one. The optimum condition in this experiment was obtained at HRT of about 24 hours and 200 mg/L pollutant concentration with 99.2% removal. Conclusions: Regarding the anionic surfactant standard in Iran which is 1.5 mg/L for surface water discharge, using this process is suitable for treating municipal wastewater and industrial wastewater, containing 100-200 mg/L pollutant. However, for the industries that produce detergents, discharging more than 200 mg/L surfactants to the wastewater, using supplementary treatments for achieving the discharge standard are required.

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Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Removal of Sodium Dodecylbenzene Sulfonate by Moving Bed Biofilm Reactor, Using Synthetic Media

2014

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“…With greater than a 90 % removal rate of NH 4 and 85 % of COD diss , it can be inferred that this MBBR system was successful in treating STE. Additionally, the high removal rates established in this study at 25°C occur close to the optimal AOB growth temperature of 28-29°C (Zhang et al 2013). The results are higher than those reported in the literature, for example by Sabry (2010), who employed a two-compartment system using an upflow septic tank/ baffled reactor to treat septic tank effluent in rural areas of Egypt.…”

Section: Treatment Of Septic Tank Effluent In Continuous Flow Mbbrmentioning

confidence: 86%

“…He also reported that an increase in the retention time of up to 5-7 days was needed to achieve a COD reduction time of 87 % at a lower temperature of 13°C. Zhang et al (2013) studied the use of a moving-bed reactor as a treatment for micropolluted waters; a considerable decline in the NH 4 ? -N removal efficiency was reported at lower temperatures (\4°C).…”

Section: Treatment Of Septic Tank Effluent In Continuous Flow Mbbrmentioning

confidence: 99%

Treatment of septic tank effluent using moving-bed biological reactor: kinetic and biofilm morphology

Almomani

Khraisheh

2016

Int. J. Environ. Sci. Technol.

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Septic tanks are very commonly used wastewater collection systems throughout the world, and especially in rural areas. In this study, the use of moving-bed biological reactors (MBBR) for the treatment of septic tank effluent (STE) was examined. The study was conducted in two phases. In Phase I, the performance of septic tanks from four projects working under different operational conditions and with different service lives was followed to determine the parameters that required further treatment. In Phase II, four specially designed continuous flow pilotplant MBBRs and one laboratory-scale batch reactor were tested for their efficiency in treating STE. Experiments were carried out at various temperatures (8-25°C) and with different hydraulic retention times (HRTs). MBBR effectively reduced STE's nutrients and chemical oxygen demand by 90 and 85 %, respectively, over 180 days of operation. The average ammonia removal rate at 25°C increased from 0.279 to 0.540 kg N/m 3 when the reactor HRT changed from 5.7 to 13.3 h. Under these conditions, the ammonia removal kinetics were successfully correlated with a theta model with an average h value of 1.054. The biofilm morphology showed a stable and global biomass coverage ([70 %) and a high percentage of live cells. A thinner biofilm was observed when the MBBR operated at high temperatures. The results of this study showed that MBBR is a promising technology for post-treatment of septic tank effluent.

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Performance and bacterial community composition of volcanic scoria particles (VSP) in a biological aerated filter (BAF) for micro‐polluted source water treatment

Xie

Wang

Qiu

et al. 2019

Water Environment Research

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A laboratory‐scale biological aerated filter (BAF), using volcanic scoria particles (VSP), was used for treating micro‐polluted source water. The system reached a steady‐state stage and performed better at removing pollutants. In steady‐state stage, the effluent ammonia (NH4+-N) and chemical oxygen demand (COD) were consistently maintained below 0.3 and 3 mg/L, respectively. Both the NH4+-N and COD removal efficiencies decreased with shorter hydraulic retention time (HRT). The effluent NH4+-N and COD exceeded health standards at 15 min of HRT. Although performance was relatively poor for VSP‐BAF at low temperature, the NH4+-N removal still achieved the drinking water quality standard. The influences of influent NH4+-N and COD concentration changes were similar to that of temperature. A better performance was observed in NH4+-N removal under higher influent NH4+-N concentrations. In contrast, the effluent COD was more than 3 mg/L when the influent COD concentrations increased to about 9 mg/L. The phylogenetic and cluster analyses indicated that the effect of HRT on bacteria community structure was higher than that of temperature, while the ammonia‐oxidizing bacteria (AOB) are sensitive to temperature. The main phyla identified in total bacteria communities were Proteobacteria, Bacteroidetes, Firmicutes, and Nitrospirae. The main AOB were Nitrosomonadales and an uncultured ammonia‐oxidizing bacterium. Practitioner points The BAF using VSP obtained a good performance for treating micro‐polluted source water. The influence of HRT on the system was more significant than that of temperature. The system is resistant to NH4+-N concentration shocks while is unable to withstand the COD increasing. The effect of HRT on bacteria community structure was significantly higher than that of temperature.

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Responses of biofilm characteristics to variations in temperature and NH4+-N loading in a moving-bed biofilm reactor treating micro-polluted raw water

Cited by 75 publications

References 31 publications

Removal of Sodium Dodecylbenzene Sulfonate by Moving Bed Biofilm Reactor, Using Synthetic Media

Removal of Sodium Dodecylbenzene Sulfonate by Moving Bed Biofilm Reactor, Using Synthetic Media

Treatment of septic tank effluent using moving-bed biological reactor: kinetic and biofilm morphology

Performance and bacterial community composition of volcanic scoria particles (VSP) in a biological aerated filter (BAF) for micro‐polluted source water treatment

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