Nitrate removal by nitrate-dependent Fe(II) oxidation in an upflow denitrifying biofilm reactor

2015 ◽  
Vol 72 (3) ◽  
pp. 377-383 ◽  
Author(s):  
Jun Zhou ◽  
Hongyu Wang ◽  
Kai Yang ◽  
Yuchong Sun ◽  
Jun Tian
Keyword(s):  
Removal Efficiency ◽  
Hydraulic Retention Time ◽  
Nitrate Concentration ◽  
Nitrate Removal ◽  
Biofilm Reactor ◽  
Nitrite Accumulation ◽  
Pseudomonas Sp ◽  
Reaction Parameters ◽  
Optimum Reaction ◽  
Maximum Removal

A continuous upflow biofilm reactor packed with ceramsite was constructed for nitrate removal under an anaerobic atmosphere without an organic carbon source. Denitrifying bacteria, Pseudomonas sp. W1, Pseudomonas sp. W2 and Microbacterium sp. W5, were added to the bioreactor as inocula. Nitrate concentration, nitrite accumulation and nitrogen removal efficiency in the effluent were investigated under various conditions set by several parameters including pH, hydraulic retention time (HRT), ratios of carbon to nitrogen (C/N) and temperature. The results illustrated that the maximum removal efficiency of nitrogen was 85.39%, under optimum reaction parameters, approximately pH 6.5–7, HRT = 48 hours and C/N = 13.1:1 at temperature of 30 °C, which were determined by experiment.

Biodegradation of DBP by Biofilm Reactor

2012 ◽  
Vol 178-181 ◽  
pp. 390-399 ◽  
Author(s):  
Jian Yu ◽  
Yu Fu ◽  
Ming Jie Jiang ◽  
Wen Hui Ren
Keyword(s):  
Kinetic Model ◽  
Removal Efficiency ◽  
Phthalic Acid ◽  
Dibutyl Phthalate ◽  
Hydraulic Retention Time ◽  
Degradation Products ◽  
Biofilm Reactor ◽  
Metabolic Intermediate ◽  
Environmental Hormone ◽  
Positive Effect

The removal efficiency of dibutyl phthalate (DBP) and its environmental hormone treated by biofilm reactor has been investigated. Besides, the the kinetic model of the degradation of DBP and its degradation products in the reactor have been discussed. The results indicate that the biofilm reactor had a positive effect on the removal of DBP and was able to significantly reduce the environmental hormone in DBP influent. The activity of β-galactosidase dropped from 13.55 millers to 3.3 millers and the removal efficiency of DBP reached 98.5% at water temperature 20°C and HRT (Hydraulic Retention Time) of 4 hours. The metabolic intermediate of DBP in the reactor mainly consisted of dibutyl phthalate and phthalic acid. The kinetic models of the degradation of DBP can be expressed by Lawrence-McCarty equation.

scholarly journals Techno-economical evaluation of nitrate removal using continuous flow electro-coagulation process: optimization by Taguchi model

2017 ◽  
Vol 17 (6) ◽  
pp. 1703-1711 ◽  
Author(s):  
E. Karamati Niaragh ◽  
M. R. Alavi Moghaddam ◽  
M. M. Emamjomeh
Keyword(s):  
Removal Efficiency ◽  
Flow Rate ◽  
Current Density ◽  
Nitrate Concentration ◽  
Nitrate Removal ◽  
Operating Costs ◽  
Inlet Flow ◽  
Inlet Flow Rate ◽  
Initial Ph ◽  
Electro Coagulation

Abstract This study aims to investigate the effect of the main parameters on the performance of a continuous flow electro-coagulation (EC) process for nitrate removal efficiency and its operating costs. For this purpose, the Taguchi experimental design with orthogonal array L27 (313) was applied to analyze the effects of selected parameters, namely initial nitrate concentration, inlet flow rate, current density and initial pH. According to the analysis of variance results, the inlet flow rate and the current density were recognized to be the most effective factors playing a pivotal role in nitrate removal efficiency by using an EC process. The optimum conditions of initial nitrate concentration, inlet flow rate, current density and initial pH were found to be 100 mg/L, 50 mL/min, 80 A/m2 and 8, respectively. As a result, the observed nitrate removal efficiency under these conditions was 61.70%. In addition, operating costs were evaluated as 1.278 US$/g NO3-removed. Finally, a high correlation was observed between the experimental and predicted results indicating an appropriate accuracy of the Taguchi model for nitrate removal efficiency and its operating costs in an EC system.

scholarly journals Denitrification Kinetics of Nitrate by a Heterotrophic Culture in Batch and Fixed-Biofilm Reactors

Processes ◽  
2020 ◽  
Vol 8 (5) ◽  
pp. 547
Author(s):  
Yen-Hui Lin ◽  
Yi-Jie Gu
Keyword(s):  
Continuous Flow ◽  
Nitrate Concentration ◽  
Batch Reactor ◽  
Nitrate Removal ◽  
Biofilm Reactor ◽  
Experimental Results ◽  
Heterotrophic Culture ◽  
Concentration Data ◽  
Water And Wastewater Treatment ◽  
Fixed Biofilm

Herein, the progress of nitrate removal by a heterotrophic culture in a batch reactor and continuous-flow fixed-biofilm reactor was examined. Two batch experiments for nitrate reduction with acetate degradation using 250 mL batch reactors with acclimated denitrifying biomass were conducted. The experimental results indicated that the nitrate was completely reduced; however, the acetate remained at a concentration of 280 mg/L from initial nitrate concentration of 100 mg/L. However, the acetate was fully biodegraded by the denitrifying biomass at an initial nitrate concentration of 300 mg/L. To evaluate the biokinetic parameters, the concentration data of nitrate, nitrite, acetate, and denitrifying biomass from the batch kinetic experiments were compared with those of the batch kinetic model system. A continuous-flow fixed-biofilm reactor was used to verify the kinetic biofilm model. The removal efficiency of nitrate in the fixed-biofilm reactor at the steady state was 98.4% accompanied with 90.5% acetate consumption. The experimental results agreed satisfactorily with the model predictions. The modeling and experimental approaches used in this study could be applied in the design of a pilot-scale, or full-scale, fixed-biofilm reactor for nitrate removal in water and wastewater treatment plants.

Multifunctional sugar-cube-like Fe3O4@Cu/PVA biomaterials for enhanced removal of nitrate and Mn(II) from moving bed biofilm reactor (MBBR)

2019 ◽  
Vol 19 (6) ◽  
pp. 1643-1652
Author(s):  
Jun Feng Su ◽  
Yi chou Gao ◽  
Dong hui Liang ◽  
Li Wei ◽  
Xue chen Bai ◽  
...  
Keyword(s):  
Hydraulic Retention Time ◽  
Nitrate Removal ◽  
Biofilm Reactor ◽  
Community Diversity ◽  
Primary Role ◽  
Moving Bed Biofilm Reactor ◽  
Moving Bed ◽  
Chromatography Analysis ◽  
Structure And Morphology ◽  
Oxidation Efficiency

Abstract A novel Fe3O4@Cu/PVA biomaterial as a new adsorbent and bacterial cell immobilized carrier was synthesized in this work. The structure and morphology were characterized by scanning electron microscopy (SEM). Effects of factors on Mn(II)-based autotrophic denitrification were investigated in a moving bed biofilm reactor (MBBR). The results indicate that the highest nitrate removal and Mn(II) oxidation efficiency occurred under the conditions of initial Mn(II) concentration of 80 mg·L−1, hydraulic retention time (HRT) of 10 h and pH 7. Meteorological chromatography analysis showed that N2 was produced as an end-product, and that gas compositions were different depending on the concentration of Mn(II) in the MBBR. The community diversity in the MBBR was markedly influenced by the concentration of Mn(II) and Pseudomonas sp. H-117 played a primary role in the process of nitrate removal and Mn(II) oxidation.

Enhancement of nitrate removal in synthetic groundwater using wheat rice stone

2012 ◽  
Vol 66 (9) ◽  
pp. 1900-1907 ◽  
Author(s):  
Siqi Hong ◽  
Jianmei Zhang ◽  
Chuanping Feng ◽  
Baogang Zhang ◽  
Puxi Ma
Keyword(s):  
Trace Elements ◽  
Activated Carbon ◽  
Retention Time ◽  
Hydraulic Retention Time ◽  
Nitrate Removal ◽  
Oxygen Demand ◽  
Nitrite Accumulation ◽  
Synthetic Groundwater ◽  
Biofilm Carriers ◽  
Growth Of Bacteria

To enhance the efficiency of nitrate removal from synthetic groundwater, wheat rice stone (WRS) and granular activated carbon (GAC) were employed as biofilm carriers for denitrification under different HRT (hydraulic retention time) and C/N ratios. Four different ratios of GAC to WRS (0, 0.5, 1.0, and 2.0) were investigated to determine the most appropriate ratio of GAC and WRS. The NO3−-N, NO2−-N, COD levels and pH of the effluent were also investigated under various HRT and C/N ratios. The results showed that the column at a GAC/WRS ratio of 1.0 performed best under a C/N ratio of 0.9 and an HRT of 8 h, with 99% nitrate being removed. In addition, little nitrite accumulation and chemical oxygen demand (COD) were observed in effluent under these conditions. These results demonstrated that, with no addition of phosphor in the influent, the nitrate removal efficiency can be enhanced by WRS because WRS can leach trace elements and phosphor to promote the growth of bacteria.

Application of a novel Polydopamine@EDTA@Fe3O4 material for efficient simultaneous nitrogen and nickel removal in an immobilized biofilm reactor

2020 ◽  
Vol 18 (5-6) ◽  
Author(s):  
Junfeng Su ◽  
Jian Liu ◽  
Dongxin Guo
Keyword(s):  
Public Health ◽  
Removal Efficiency ◽  
High Throughput Sequencing ◽  
Hydraulic Retention Time ◽  
Biofilm Reactor ◽  
Polluted Water ◽  
Simultaneous Removal ◽  
Biofilm Reactors ◽  
Nickel Removal ◽  
Mining Wastewater

AbstractHigh NO3− and Ni(II) concentrations in mining wastewater pose a risk to public health. In this study, the NO3− and Ni(II) removal process was performed using a novel PDA@EDTA@Fe3O4 immobilization carrier. The effects of hydraulic retention time (HRT; 6, 8, and 10 h), along with Fe(II) (10, 15, and 20 mg/L) and Ni(II) (10, 20, and 30 mg/L) influent concentrations on the simultaneous removal of NO3− and Ni(II) were investigated in immobilized biofilm reactors. Results showed that the highest NO3− removal efficiency (97.78%) and Ni(II) removal efficiency (91.21%) were obtained in the immobilized biofilm reactor with PDA@EDTA@Fe3O4 under the conditions of 10 h HRT, influent Fe(II) concentrations of 20 mg/L and Ni(II) concentrations of 10 mg/L. High-throughput sequencing results confirmed that Cupriavidus sp.CC1 plays a major role in the functioning of the immobilized reactor. This process provides the potential for effective treatment of NO3− and Ni(II) polluted water.

Nitrate removal efficiency of bacterial consortium (Pseudomonas sp. KW1 and Bacillus sp. YW4) in synthetic nitrate-rich water

2008 ◽  
Vol 157 (2-3) ◽  
pp. 553-563 ◽  
Author(s):  
Sundaram Rajakumar ◽  
Pudukadu Munusamy Ayyasamy ◽  
Kuppusamy Shanthi ◽  
Palanisami Thavamani ◽  
Palanivel Velmurugan ◽  
...  
Keyword(s):  
Removal Efficiency ◽  
Nitrate Removal ◽  
Bacterial Consortium ◽  
Pseudomonas Sp ◽  
Bacillus Sp

Application of light-weight filtration media in an anoxic biofilter for nitrate removal from micro-polluted surface water

2016 ◽  
Vol 74 (4) ◽  
pp. 1016-1024 ◽  
Author(s):  
Zheng Wang ◽  
Xiang Fei ◽  
Shengbing He ◽  
Jungchen Huang ◽  
Weili Zhou
Keyword(s):  
Surface Water ◽  
Removal Efficiency ◽  
Sodium Acetate ◽  
Consumption Rate ◽  
Hydraulic Retention Time ◽  
Loading Rate ◽  
Nitrate Nitrogen ◽  
Nitrate Removal ◽  
Light Weight ◽  
Stage Process

The research investigated nitrate removal from micro-polluted surface water by the single-stage process of anoxic biofilter using light-weight polystyrene beads as filtration media. In this study, sodium acetate was used as an external carbon source and the nitrate removal efficiency under different regimes of hydraulic loading rate (HLR), water temperature, and C/N ratio was studied. In addition, the effect of backwash on denitrification efficiency was investigated. The results show that the biofilter achieved a high nitrate removal efficiency in 2 weeks at water temperatures ranging between 22 and 25 °C at a C/N ratio (COD:NO3−-N) of 6:1. Besides, the average removal efficiency of nitrate at HLRs of 5.66, 7.07 and 8.49 m3 m−2 h−1 were 87.5, 87.3 and 87.1%, respectively. The average removal efficiency of nitrate nitrogen was 13.9% at a HLR of 5.66 m3 m−2 h−1 at water temperatures of 12–14 °C, then it increased to 93.7% when the C/N ratio increased to 10. It suggests that the optimal hydraulic retention time is at water temperatures of 8–10 °C. The water consumption rate of backwash was about 0.2–0.3%, and denitrification efficiency returned to the normal level in 12 h after backwash.

Nitrogen Removal Optimization in a Biofilm Reactor from Groundwater

2012 ◽  
Vol 518-523 ◽  
pp. 2604-2607
Author(s):  
Chang Hang Wu ◽  
Yun Xiao Jin
Keyword(s):  
Nitrogen Removal ◽  
Retention Time ◽  
Hydraulic Retention Time ◽  
Nitrate Removal ◽  
Biofilm Reactor

In the present study a lab-scale biofilm reactor was monitored for approximately 6 months to evaluate the use of ratios of carbon to nitrogen (C/N), pH and hydraulic retention time(HRT) levels as monitoring parameters in order to optimize nitrate removal from groundwater. The results indicated it was possible to operate the biofilm system at high denitrification rates and relatively low HRT of 8 hours.

Nitrate removal with low N2O emission by application of sulfur denitrification in actual agricultural field

2004 ◽  
Vol 50 (8) ◽  
pp. 145-151 ◽  
Author(s):  
K. Hasegawa ◽  
K. Shimizu ◽  
K. Hanaki
Keyword(s):  
Nitrous Oxide ◽  
Removal Efficiency ◽  
Nitrate Concentration ◽  
Nitrate Removal ◽  
N2o Emission ◽  
Spring Water ◽  
The Other ◽  
Agricultural Field ◽  
Valley Bottom ◽  
Sampling Points

Sulfur denitrification was applied to the agricultural field and the characteristics of the treatment were evaluated from the viewpoints of nitrate removal efficiency and nitrous oxide (N2O) emission. Two actual sites where sulfur denitrification was performed were surveyed. One is a valley bottom field, where groundwater contaminated with nitrate is coming up as spring water. The nitrate concentration in influent was about 45 mgN/L. The other was wastewater from a plastic greenhouse. The nitrate concentration in inflow water was about 200 mgN/L. Nitrate was almost removed by the containers packed with sulfur (S0)- CaCO3 blocks in both sites. Increase of sulfate indicated that nitrate was removed by sulfur denitrification. This was also estimated stoichiometrically from the relationships between the removed nitrate and produced sulfate. The N2O was supersaturated in water at most sampling points and the highest concentration of dissolved N2O reached 900 μgN/L in Saitama in March. It seemed that insufficient nitrate removal caused accumulation of intermediates during denitrification, such as nitrite and N2O, in this month. However, the emission ratio of N2O to the removed nitrate during these processes was kept low, ranging from 0.01 to 0.19%, at both two sites throughout all surveys.

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