Denitrification and microbial community in MBBR using A. donax as carbon source and biofilm carriers for reverse osmosis concentrate treatment

Li, Li; Yan, Guokai; Wang, Haiyan; Chu, Zhaosheng; Li, Zewen; Ling, Yu; Wu, Tong

doi:10.1016/j.jes.2019.04.030

Cited by 39 publications

(16 citation statements)

References 32 publications

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“…As illustrated in Table 2, the turbulent conditions might be worsened when the FR is greater than 50%, and a large number of microorganisms might be stripped from the carrier surface due to the effects of mass transfer and hydraulic shearing, thus impeding the growth of the bacteria related with NH 4 + -N removal. Li et al reported that the anammox gene existed in the carrier biofilm of denitrifying MBBR for reverse osmosis concentrate treatment [23]. The weakening of the anammox gene bacteria is bound to reduce the NH 4 + -N removal efficiency of the whole system.…”

Section: Resultsmentioning

confidence: 99%

“…Liu et al found that 25℃ was the optimum temperature for the removal of nitrogen from WWTP effluent by denitrifying MBBR, considering the nitrogen and organic removal efficiency as a whole [22]. Li et al used raw Arundo donax pieces as carbon source and biofilm carrier in a lab-scale denitrifying MBBR to remove NO 3 − -N from reverse osmosis concentrate, with high denitrification capability (73.2% ± 19.5% NO 3 − -N removal efficiency and 8.10 ± 3.45 g NO 3 − -N/m 3 /d volumetric removal rate) obtained at stable operation stage [23].…”

Section: Introductionmentioning

confidence: 99%

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Influence of Carrier Filling Ratio on the Advanced Nitrogen Removal from Wastewater Treatment Plant Effluent by Denitrifying MBBR

Ying

Yuan

et al. 2019

IJERPH

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The filling ratio (FR) of a carrier has an influence on the pollutant removal of the aerobic moving bed biofilm reactor (MBBR). However, the effect of the polyethylene (PE) carrier FR on the performance and microbial characteristics of the denitrifying MBBR for the treatment of wastewater treatment plant (WWTP) effluent has not been extensively studied. A bench-scale denitrifying MBBR was set up and operated with PE carrier FRs of 20%, 30%, 40%, and 50% for the degradation of chemical oxygen demand (COD) and nitrogen from WWTP effluent at 12 h hydraulic retention time (HRT). The nitrate removal rates with FRs of 20%, 30%, 40%, and 50% were 94.3 ± 3.9%, 87.7 ± 7.3%, 89.7 ± 11.6%, and 94.6 ± 4.0%, and the corresponding denitrification rates (rNO3--N) were 8.0 ± 5.6, 11.3 ± 4.6, 11.6 ± 4.6, and 10.0 ± 4.9 mg NO3−-N/L/d, respectively. Nitrous oxide reductase (nosZ) gene-based terminal restriction fragment length polymorphism (T-RFLP) analysis illustrated that the highest functional diversity (Shannon’s diversity index, H′) of biofilm microbial community was obtained at 30% FR. The quantitative polymerase chain reaction (qPCR) results indicated that the abundance of nitrate reductase (narG) and nosZ genes at 30% FR was significantly higher than that at 20% FR, and no significant changes were observed at 40% and 50% FRs. Thus, 30% FR was recommended as the optimal carrier FR for the denitrifying MBBR.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Influence of Carrier Filling Ratio on the Advanced Nitrogen Removal from Wastewater Treatment Plant Effluent by Denitrifying MBBR

Ying

Yuan

et al. 2019

IJERPH

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“…German scientists have made a considerable contribution to the study of this field [22]. So, in particular, a system of wastewater treatment using biofilm is proposed.…”

Section: Introductionmentioning

confidence: 99%

Application of Biofilm Carrier in Aerobic Reactors as a Method to Improve Quality of Wastewater Treatment

Makisha

2021

Hydrology

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The research revealed in the paper considers the improvement of secondary treatment of wastewater in the aerobic reactor to provide removal of organics and nutrients. There were five types of polymer biofilm carriers taken into account initially; however, two of them were decided not to apply due to technological reasons. The main part of the research was divided into three substages to investigate each type of biofilm carrier. According to the literature review, the optimal efficiency may be reached if the carrier filling ratio is 10 to 30% of reactor volume. On this basis, there were three benches launched at each sub-stage with a corresponding filling ratio of 10, 20, and 30%. The fourth reactor at each sub-stage had no floating carrier to control the experiment. The research of all three types of carriers showed the effect of BOD removal in the range of 95–96% for benches equipped with a floating carrier, which can be considered similar to the control bench with the efficiency of 92%. In the case of ammonia nitrogen, the removal control bench showed only 55% of efficiency, while floating carriers helped to increase the efficiency up to 70–86%. Despite obtaining relatively positive results, the research has to be continued to achieve regulation requirements in treatment quality.

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“…Similar studies presented slower nitrate removal rate than those reported here (Table 3). Firstly, the study by Li et al (2019), which focused on treatment of reverse osmosis concentrate containing nitrate by biomass fixed to polyethylene biocarriers, reported a denitrification rate of 0.08 kg-N/m 3 /d. Similarly, the FIGURE 5 | (A) Nitrate concentration with time, where the initial concentration is 200 mg/l; treatment vs. sterile controls in biomass immobilized in aqueous solution (batch moving bed bioreactor) at three different C:N ratios (1:1, 2:1, and 3:1) and in non-immobilized biomass in suspension (flasks) at a C:N ratio of 3:1.…”

Section: Batch Moving Bed Bioreactormentioning

confidence: 99%

A New Acinetobacter Isolate Is an Extremely Efficient Biofilm-Formative Denitrifying Bacterium

Shelly

Kuc

Iasur-Kruh

et al. 2020

Front. Environ. Sci.

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A very effective removal of nitrate in batch and continuous experiments was achieved by a newly biofilm-formative isolated bacterium, identified by 16S rRNA as Acinetobacter EMY. The anoxic denitrifying capabilities of Acinetobacter EMY, attached to plastic biocarriers in batch and continuous moving bed bioreactors, demonstrated up to 1.75 times higher nitrate removal compared with a bacterial suspension. The denitrification rates of nitrate (200 mg/l) in the continuous operation mode were 0.39, 0.65, 1.23, and 1.14 kg-N/m 3 /d, with hydraulic retention times (HRTs) of 12, 8, 4, and 2 h, respectively, whereas the batch reactor removal performance showed up to 1.49 kg-N/m 3 /d. To the best of our knowledge, these findings are the highest values obtained for nitrate removal in comparison to previous studies focused on the characterization of denitrifying isolates. In addition, this bacterium is able to consume all of the organic matter provided in solution together with the nitrate, without leaving any residuals of organic matter in the water. This is advantageous since nitrate removal treatments by heterotrophic bacteria usually require addition of organic matter to the system, leading to secondary pollution. The isolated bacterium therefore provides a good solution for biological treatment of nitrogen in water, particularly in treatment systems that integrate immobilized biomass in the treatment process.

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Denitrification and microbial community in MBBR using A. donax as carbon source and biofilm carriers for reverse osmosis concentrate treatment

Cited by 39 publications

References 32 publications

Influence of Carrier Filling Ratio on the Advanced Nitrogen Removal from Wastewater Treatment Plant Effluent by Denitrifying MBBR

Influence of Carrier Filling Ratio on the Advanced Nitrogen Removal from Wastewater Treatment Plant Effluent by Denitrifying MBBR

Application of Biofilm Carrier in Aerobic Reactors as a Method to Improve Quality of Wastewater Treatment

A New Acinetobacter Isolate Is an Extremely Efficient Biofilm-Formative Denitrifying Bacterium

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