scholarly journals Nitrate Removal of a Cattail Wetland Cell Purifying Effluent from a Secondary-Level Treatment Plant During Its Initial Operating Stage

2004 ◽  
Vol 23 (4) ◽  
pp. 228-233
Author(s):  
Hong-Mo Yang
Keyword(s):  
Nitrate Removal ◽  
Treatment Plant ◽  
Secondary Level ◽  
Wetland Cell ◽  
Operating Stage

Nitrate removal using Brevundimonas diminuta MTCC 8486 from ground water

2009 ◽  
Vol 60 (2) ◽  
pp. 517-524 ◽  
Author(s):  
S. Kavitha ◽  
R. Selvakumar ◽  
M. Sathishkumar ◽  
K. Swaminathan ◽  
P. Lakshmanaperumalsamy ◽  
...  
Keyword(s):  
Carbon Source ◽  
Ground Water ◽  
Nitrate Removal ◽  
Carbon Sources ◽  
Treatment Plant ◽  
Growth Conditions ◽  
Pilot Scale ◽  
Biological Removal ◽  
Treatment Processes ◽  
Brevundimonas Diminuta

Brevundimonas diminuta MTCC 8486, isolated from marine soil of coastal area of Trivandrum, Kerala, was used for biological removal of nitrate from ground water collected from Kar village of Pali district, Rajasthan. The organism was found to be resistance for nitrate up to 10,000 mg L−1. The optimum growth conditions for biological removal of nitrate were established in batch culture. The effect of carbon sources on nitrate removal was investigated using mineral salt medium (MSM) containing 500 mg L−1 of nitrate to select the most effective carbon source. Among glucose and starch as carbon source, glucose at 1% concentration increased the growth (182±8.24 × 104 CFU mL−1) and induced maximum nitrate reduction (86.4%) at 72 h. The ground water collected from Kar village, Pali district of Rajasthan containing 460±5.92 mg L−1 of nitrate was subjected to three different treatment processes in pilot scale (T1 to T3). Higher removal of nitrate was observed in T2 process (88%) supplemented with 1% glucose. The system was scaled up to 10 L pilot scale treatment plant. At 72 h the nitrate removal was observed to be 95% in pilot scale plant. The residual nitrate level (23±0.41 mg L−1) in pilot scale treatment process was found to be below the permissible limit of WHO.

scholarly journals Enhancing Nitrate Removal from Waters with Low Organic Carbon Concentration Using a Bioelectrochemical System—A Pilot-Scale Study

Water ◽  
2020 ◽  
Vol 12 (2) ◽  
pp. 516 ◽  
Author(s):  
Rauno Lust ◽  
Jaak Nerut ◽  
Kuno Kasak ◽  
Ülo Mander
Keyword(s):  
Organic Carbon ◽  
Dissolved Oxygen ◽  
Oxygen Concentration ◽  
Power Efficiency ◽  
Municipal Wastewater ◽  
Nitrate Removal ◽  
Treatment Plant ◽  
Municipal Wastewater Treatment ◽  
Dissolved Oxygen Concentration ◽  
Organic Carbon Concentration

Assessments of groundwater aquifers made around the world show that in many cases, nitrate concentrations exceed the safe drinking water threshold. This study assessed how bioelectrochemical systems could be used to enhance nitrate removal from waters with low organic carbon concentrations. A two-chamber microbial electrosynthesis cell (MES) was constructed and operated for 45 days with inoculum that was taken from a municipal wastewater treatment plant. A study showed that MES can be used to enhance nitrate removal efficiency from 3.66% day−1 in a control reactor to 8.54% day−1 in the MES reactor, if a cathode is able to act as an electron donor for autotrophic denitrifying bacteria or there is reducing oxygen in a cathodic chamber to favor denitrification. In the MES, greenhouse gas emissions were also lower compared to the control. Nitrous oxide average fluxes were −639.59 and −9.15 µg N m−2 h−1 for the MES and control, respectively, and the average carbon dioxide fluxes were −5.28 and 43.80 mg C m−2 h−1, respectively. The current density correlated significantly with the dissolved oxygen concentration, indicating that it is essential to keep the dissolved oxygen concentration in the cathode chamber as low as possible, not only to suppress oxygen’s inhibiting effect on denitrification but also to achieve better power efficiency.

Microbial Fe(II)-oxidation by nitrate in activated sludge

1998 ◽  
Vol 37 (4-5) ◽  
pp. 403-406 ◽  
Author(s):  
Jeppe Lund Nielsen ◽  
Per Halkjær Nielsen
Keyword(s):  
Activated Sludge ◽  
Nitrate Removal ◽  
Treatment Plant ◽  
Full Scale ◽  
Floc Structure ◽  
Nitrate And Nitrite ◽  
P Removal

The oxidation of Fe(II) to Fe(III) by addition of nitrate and nitrite to activated sludge was studied to determine whether the process was biological or chemical (chemodenitrification). It was shown that the process was mainly biological, although the microorganisms involved have not yet been described. Investigations in a full scale treatment plant suggested that the process most likely took place in the anoxic (denitrification) tank. Details of the kinetics and stoichiometry have not yet been determined, but the process may be of significance for keeping Fe(III) oxidized, which is important for P-removal and for floc structure. Furthermore, in some treatment plants, the oxidation may also be of significance for nitrate removal (denitrification).

Full-Scale Application of Nitrogen Removal with Methanol as Carbon Source

1992 ◽  
Vol 26 (5-6) ◽  
pp. 1077-1086 ◽  
Author(s):  
U. Nyberg ◽  
H. Aspegren ◽  
B. Andersson ◽  
J. la C. Jansen ◽  
I.S. Villadsen
Keyword(s):  
Carbon Source ◽  
Nitrogen Removal ◽  
Nitrate Removal ◽  
Sewage Treatment ◽  
Carbon Sources ◽  
Treatment Plant ◽  
Cost Effective ◽  
High Level ◽  
Plant Configuration ◽  
Composite Samples

In Sweden many advanced sewage treatment plants for BOD and phosphorus removal have to be extended with nitrogen removal. Due to existing plant configuration and wastewater composition, denitrification with supply of an external carbon source can be a cost-effective solution in many cases. At the Klagshamn wastewater treatment plant in Malmo investigations for extensive nitrogen removal have been made in a single-sludge system with pre-precipitation and post-denitrification where methanol was added for denitrification. Results from the tests showed that a high level of nitrogen removal can be reached, and that the process was stable and easy to operate. The process application gave less supplementary cost for an extended nitrogen removal than for upgrading the plant with larger basin volumes. In order to examine the purification performance caused by the addition of methanol, the starting period was followed extensively with online nitrate sensors and daily composite samples. The development of the denitrif ication capacity of the sludge with methanol and acetate as carbon sources was followed and microbiological changes were examined microscopically. Complete denitrification was obtained after approximately one month at 10°C. The denitrification capacity of the sludge with methanol reached that of acetate after about the same time. The microscopic examination revealed a growing population of budding and/or appendaged bacteria, presumably Hyphomicrobium spp, reaching a stable maximum at the time when optimal nitrate removal occurred.

Isolation and Identification of Nitrobacteria Adapted to Low Temperature

2012 ◽  
Vol 518-523 ◽  
pp. 406-410 ◽  
Author(s):  
Yun Hao ◽  
Xiu Guang Jiang ◽  
Qing Tian ◽  
Ai Yin Chen ◽  
Bao Ling Ma
Keyword(s):  
Low Temperature ◽  
Removal Efficiency ◽  
Nitrate Removal ◽  
Sewage Treatment ◽  
Sewage Treatment Plant ◽  
Treatment Plant ◽  
Ammonia Nitrogen ◽  
Aeration Tank ◽  
Isolation And Identification ◽  
Nitrification Process

In this study, a scientific method which can be used to improve nitrification process at low temperature in the sewage treatment plant was introduced. The activated sludge samples were taken from aeration tank of the sewage treatment plant when the outside temperature was below 0°C (water temperature below 12 °C). Five kinds of nitrobacteria strains with cold-resistance and higher activity of ammonia degradation were isolated from aeration tanks. The physiological properties showed the five strains were identified into Sphingobacteriaceae、Rhodanobacter sp.、Pseudomonas sp.、Pandoraea sp. and Perlucidibaca piscinae. All of the strains could convert ammonia-nitrogen or NO2- into NO3- in the medium at 10°C. The ammonia and nitrate removal efficiency could be reached 80.9% and 80.3% respectively. Comparing to the unvaccinated one, the removal efficiency can be increased by 50%, which proved the isolated nitrobacteria could be applied to biological nitrification process of sewage treatment at low-temperature.

scholarly journals Geoarcheological Investigations of Wetland Cell D Within the Dallas Floodway Extension Project Area, Dallas, Texas

2002 ◽  
Keyword(s):  
Treatment Plant ◽  
Flood Plain ◽  
Flood Damage ◽  
Army Corps ◽  
Army Corps Of Engineers ◽  
Project Area ◽  
Fine Grained ◽  
Trinity River ◽  
Wetland Cell ◽  
The Trinity

The Dallas Floodway Extension project is designed to provide flood damage reduction and environmental restoration within the Trinity River flood plain between the Corinth Street Viaduct and Loop 12. The U.S. Army Corps of Engineers, Fort Worth District, contracted with Geo-Marine, Inc., to conduct an archeological assessment of the proposed Wetland Cell D. The archeological assessment was to identify any potential archeological sites that may be eligible for inclusion in the National Register of Historic Places and to provide an assessment of the potential for buried landforms in the project area that may have intact archeological resources present. The geoarcheological investigations, involving the excavation of 10 backhoe trenches and the review of previous data collected within the Upper Trinity River drainage, revealed that the flood plain sediments of the Trinity River are quite variable, both horizontally and vertically. The data collected during the current investigations suggest that Cell D is located along or near the axis of a recent Trinity River meander belt that has cut deeply into the preexisting Quaternary sediments. This channel cut was then rapidly filled with fine-grained deposits possibly derived from the surrounding uplands and other areas upstream. In addition, the trenching revealed that the upper portions of the sediments within Cell D have been disturbed during the recent historic period, presumably by the construction of the Interstate 45 bridge and the activities of the nearby Dallas Central Wastewater Treatment Plant.

Catalytic reduction of nitrate in secondary effluent of wastewater treatment plants by Fe0 and Pd–Cu/γ–Al2O3

2016 ◽  
Vol 73 (11) ◽  
pp. 2697-2703 ◽  
Author(s):  
Yupan Yun ◽  
Zifu Li ◽  
Yi-Hung Chen ◽  
Mayiani Saino ◽  
Shikun Cheng ◽  
...  
Keyword(s):  
Wastewater Treatment ◽  
Reaction Time ◽  
Wastewater Treatment Plants ◽  
Catalytic Reduction ◽  
Nitrate Removal ◽  
Treatment Plant ◽  
Catalytic Performance ◽  
Secondary Effluent ◽  
Mass Ratio ◽  
Operational Conditions

Total nitrogen, in which NO3− is dominant in the effluent of most wastewater treatment plants, cannot meet the requirements of the Chinese wastewater discharge standard (<15 mg/L), making nitrate (NO3−) elimination attract considerable attention. In this study, reductant iron (Fe0) and γ–Al2O3 supported palladium–copper bimetallic catalysts (Pd–Cu/γ–Al2O3) were innovatively used for the chemical catalytic reduction of nitrate in wastewater. A series of specific operational conditions (such as mass ratio of Pd:Cu, catalyst amounts, reaction time and pH of solution) were optimized for nitrate reduction in the artificial solution, and then the selected optimal conditions were further applied for investigating the nitrate elimination of secondary effluent of a wastewater treatment plant in Beijing, China. Results indicated that a better catalytic performance (74% of nitrate removal and 62% of N2 selectivity) could be obtained under the optimal condition: 5 g/L Fe0, 3:1 mass ratio (Pd:Cu), 4 g/L catalyst, 2 h reaction time and pH 5.1. It is noteworthy to point out that nitrogen gas (N2) predominated in the byproducts without another system to treat ammonium and nitrite. Therefore, the chemical catalytic reduction combining Fe0 with Pd–Cu/γ–Al2O3 could be regarded as a better alternative for nitrate removal in wastewater treatment.

scholarly journals Elimination of nitrate in secondary effluent of wastewater treatment plants by Fe0 and Pd-Cu/diatomite

2016 ◽  
Vol 8 (1) ◽  
pp. 29-37 ◽  
Author(s):  
Yupan Yun ◽  
Zifu Li ◽  
Yi-Hung Chen ◽  
Mayiani Saino ◽  
Shikun Cheng ◽  
...  
Keyword(s):  
Wastewater Treatment ◽  
Reaction Time ◽  
Nitrate Reduction ◽  
Wastewater Treatment Plants ◽  
Copper Catalyst ◽  
Nitrate Removal ◽  
Treatment Plant ◽  
Secondary Effluent ◽  
Mass Ratio ◽  
Operational Conditions

Abstract Because total nitrogen (TN), in which nitrate (NO3–) is dominant in the effluent of most wastewater treatment plants, cannot meet the requirement of Chinese wastewater discharge standard (<15 mg/L), NO3– elimination has attracted considerable attention. In this research, the novel diatomite-supported palladium-copper catalyst (Pd-Cu/diatomite) with zero-valent iron (Fe0) was tried to use for catalytic reduction of nitrate in wastewater. Firstly, specific operational conditions (such as mass ratio of Pd:Cu, catalyst amounts, reaction time and pH of solution) were optimized for nitrate reduction in artificial solution. Secondly, the selected optimal conditions were further employed for nitrate elimination of real effluent of a wastewater treatment plant in Beijing, China. Results showed that 67% of nitrate removal and 62% of N2 selectivity could be obtained under the following conditions: 5 g/L Fe0, 3:1 mass ratio (Pd:Cu), 4 g/L catalyst, 2 h reaction time and pH 4.3. Finally, the mechanism of catalytic nitrate reduction was also proposed.

scholarly journals Nitrate Removal by Pseudomonas fluorescens K4 Isolated from a Municipal Sewage Treatment Plant

2007 ◽  
Vol 16 (11) ◽  
pp. 1219-1223
Author(s):  
O-Mi Lee ◽  
Jong-Hyeok Oh ◽  
Doo-Seong Hwang ◽  
Yun-Dong Choi ◽  
Un-Soo Chung ◽  
...  
Keyword(s):  
Pseudomonas Fluorescens ◽  
Nitrate Removal ◽  
Sewage Treatment ◽  
Sewage Treatment Plant ◽  
Treatment Plant ◽  
Municipal Sewage ◽  
Municipal Sewage Treatment Plant

Design, construction and performance of a horizontal subsurface flow wetland system in Australia

2013 ◽  
Vol 68 (9) ◽  
pp. 1920-1925 ◽  
Author(s):  
Lise M. W. Bolton ◽  
Keith G. E. Bolton
Keyword(s):  
Subsurface Flow ◽  
Oxygen Demand ◽  
Extended Period ◽  
Secondary Level ◽  
Social Needs ◽  
Septic Tank ◽  
In Series ◽  
Horizontal Subsurface Flow ◽  
High Level ◽  
Wetland Cell

Malabugilmah is a remote Aboriginal community located in Clarence Valley, Northern NSW, Australia. In 2006, seven horizontal subsurface flow wetland clusters consisting of 3 m × 2 m wetland cells in series were designed and constructed to treat septic tank effluent to a secondary level (Total Suspended Solids (TSS) < 30 mg/L and Biochemical Oxygen Demand (BOD5) <20 mg/L) and achieve >50% Total Nitrogen (TN) reduction, no net Total Phosphorus (TP) export and ≥99.9% Faecal Coliform (FC) reduction. The wetland cell configuration allowed the wetlands to be located on steeper terrain, enabling effluent to be treated to a secondary level without the use of pumps. In addition to the water quality targets, the wetlands were designed and constructed to satisfy environmental, economic and social needs of the community. The wetland systems were planted with a local Australian wetland tree species which has become well established. Two wetland clusters have been monitored over the last 4 years. The wetlands have demonstrated to be robust over time, providing a high level of secondary treatment over an extended period.

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