Denitrification Reactor Articles on Environmental XPRT

Hydrogenotrophic denitrification in an attached growth reactor under various operating conditions

To study the performance of an attached growth reactor on nitrate-nitrogen (NO3-N) removal by a hydrogenotrophic denitrification process, the reactor was operated under various H2 flow rates (30, 50 and 70 mL/min), hydraulic retention times (HRTs) (2.6, 3.1, 4.7 and 6.7 h) and inorganic carbon (IC) concentrations (excess and no IC addition). Synthetic NO3-N water was prepared in accordance with ...

Feb. 1, 2012

By IWA Publishing

Enhancement of denitrification in a down-flow hanging sponge reactor by effluent recirculation

A down-flow hanging sponge reactor, constructed by connecting three identical units in series, was applied to the treatment of artificial wastewater containing phenol and ammonia under high salinity conditions (10.9 g-Cl−/L). The theoretical hydraulic retention time (HRT) of each unit was 4 h (total HRT = 12 h). To enhance denitrification by effluent recirculation, the effluent ...

Aug. 8, 2013

By IWA Publishing

Denitrification performance and microbial community dynamics in a denitrification reactor as revealed by high-throughput sequencing

The dynamics of the bacterial community associated with the denitrification process in a fixed bed column reactor (FBCR) were investigated using 454-pyrosequencing methodology. A FBCR filled with elemental sulfur and limestone was operated for about 94 days under autotrophic and mixotrophic (autotrophic + heterotrophic) conditions at 30 °C. Efficient simultaneous bromate and nitrate removal ...

Dec. 5, 2016

By IWA Publishing

IFAS Media in a Sequencing Batch Reactor for Nitrification and Denitrification of High Strength Wastewater

In 1996 a study group identified pig farm waste as one of Asia’s foremost environmental problems. So in 1999 a US AEP led effort established the Environmental Center for Livestock Waste Management (ECLWM) on the campus of the National Pingtung University of Science and Technology (NPUST), Taiwan. The ECLWM constructed a state-of-the-art prototype swine manure wastewater treatment system. A ...

Oct. 21, 2006

By Water Environment Federation (WEF)

The application of moving bed biofilm reactor to denitrification process after trickling filters

The paper presents research of a prototype moving bed biofilm reactor (MBBR). The device was used for the post-denitrification process and was installed at the end of a technological system consisting of a septic tank and two trickling filters. The concentrations of suspended biomass and biomass attached on the EvU Perl moving bed surface were determined. The impact of the external organic ...

Oct. 8, 2016

By IWA Publishing

Biological denitrification of brines from membrane treatment processes using an upflow sludge blanket (USB) reactor

This paper investigates denitrification of brines originating from membrane treatment of groundwater in an upflow sludge blanket (USB) reactor, a biofilm reactor without carrier. A simulated brine wastewater was prepared from tap water and contained a nitrate concentration of 125 mg/l as N and a total salt concentration of about 1%. In order to select for a suitable energy source for ...

Feb. 1, 2010

By IWA Publishing

Nitrate removal from groundwater by hydrogen-fed autotrophic denitrification in a bio-ceramsite reactor

In this work, the denitrification performance of a bio-ceramsite reactor based on autohydrogenotrophic denitrification was investigated. The effects of various experimental parameters such as nitrate loading, carbon to nitrogen ratio (C/N), water temperature and pH were evaluated during the operation. The unique aspect of this research is that the bio-reactor uses ceramsite as a carrier, which ...

Jun. 25, 2014

By IWA Publishing

Characterization and kinetics of sulfide-oxidizing autotrophic denitrification in batch reactors containing suspended and immobilized cells

Sulfide-oxidizing autotrophic denitrification is an advantageous alternative over heterotrophic denitrification, and may have potential for nitrogen removal of low-strength wastewaters, such as anaerobically pre-treated domestic sewage. This study evaluated the fundamentals and kinetics of this process in batch reactors containing suspended and immobilized cells. Batch tests were performed for ...

Jan. 1, 2011

By IWA Publishing

Influence of denitrification reactor retention time distribution (RTD) on dissolved oxygen control and nitrogen removal efficiency

Low concentrations of dissolved oxygen (DO) are usually found in biological anoxic pre-denitrification reactors, causing a reduction in nitrogen removal efficiency. Therefore, the reduction of DO in such reactors is fundamental for achieving good nutrient removal. The article shows the results of an experimental study carried out to evaluate the effect of the anoxic reactor hydrodynamic model on ...

Jun. 29, 2015

By IWA Publishing

Rapid cultivation of aerobic granular sludge for Simultaneous Nitrification and Denitrification in Sequencing Batch Airlift Reactor

The cultivation of aerobic granular sludge in Sequencing Batch Airlift Reactor (SBAR) was investigated. The results showed that the aerobic granular sludge could be formed in short time (35 d) owing to better shear force and selective pressure in SBAR. Meanwhile, aerobic granulation was clearly accelerated when the external carbon source was intermittently added at one-cycle intervals. The mean ...

Dec. 6, 2010

By Inderscience Publishers

The Benefit of Aerobic Methanol Uptake on Denitrification Capacity

The Blue Plains Advanced Wastewater Treatment Plant (AWTP) in Washington, DC has a high rate activated sludge system followed by a suspended growth nitrification-denitrification system. Methanol is used for post-denitrification, because it is the least expensive synthetic compound available that does not leave residual biochemical oxygen demand (BOD) in the process effluent. The process achieves ...

Oct. 13, 2007

By Water Environment Federation (WEF)

Electrolytic denitrification with an ion-exchange membrane in groundwater

Nitrate contamination of groundwater is an important issue in rural areas. In this study, an electrolytic method for the denitrification of groundwater was investigated in a laboratory reactor. We used an ion-exchange membrane, employing a titanium oxide anode and five kinds of cathode for the investigation. The nitrate removal efficiencies with Cu, Pb, Ti/Ir/Ru, Ti/Ir/Ta, and Zn cathodes were ...

Jul. 3, 2015

By IWA Publishing

Poly (Ε-caprolactone) as substrate for water denitrification

In this paper, poly (Ε-caprolactone) (PCL) was used as carbon source and biofilm supporter in a fixed bed bioreactor to biologically remove nitrate from drinking water. The experimental results showed that denitrifying microorganisms could easily adapt to PCL as carbon source and attach to the surface of PCL granules. The fine biofilm could form on the surface of PCL granules within 15 days. ...

Jul. 20, 2009

By Inderscience Publishers

Nitrate: AQUAMEND™ Denitrification Units (Septic Water)

The AQUAMEND® process has proven to be successful for the treatment of a wide range of constituents of interest. Much work was performed by Adventus in the area of treatment of high-strength industrial wastewater, with concentrations as high as 3,000 mg/L NO3-N (nitrate as nitrogen). In recent years development focused on use of the technology for the treatment of nitrate from on-site treatment ...

Apr. 16, 2007

Comparison of particulate pyrite autotrophic denitrification (PPAD) and sulfur oxidizing denitrification (SOD) for treatment of nitrified wastewater

The use of reduced sulfur compounds as electron donors for biological denitrification has the potential to reduce chemical and sludge disposal costs as well as carry-over of organic carbon to the effluent that often occurs with heterotrophic denitrification. Although a number of prior studies have evaluated sulfur oxidizing denitrification (SOD), no prior studies have evaluated particulate ...

Nov. 8, 2016

By IWA Publishing

Nitrification/denitrification in swine wastewater using porous ceramic sticks with plastic rings as supporting media in two-stage fixed-biofilm reactors

This study evaluated the performance of oxic-anoxic fixed-biofilm reactors (FBRs) using porous ceramic sticks with plastic rings as supporting media for nitrogen and organic carbon (as COD) removal from swine wastewater. Experimental results indicate that the removal efficiency of NH4+-N increased to 86–92% from 52–98% as the volumetric ammonium-nitrogen loading rate increased to 0.25 kg ...

Sep. 1, 2010

By IWA Publishing

Nitrogen removal from reject water with primary sludge as denitrification carbon source

A novel system was used for nitrogen removal from reject water. This system includes one anoxic/oxic reactor for nitrification and a special reactor for denitrification in which primary sludge was added intermittently as electron donor. In denitrification reactor, sludge fermentation and denitrification reaction took place simultaneously and promoted each other. It was found that effluent recycle ...

Jun. 1, 2010

By IWA Publishing

Integration of nitrification and denitrification by combining anoxic and aerobic conditions in a membrane bioreactor

A membrane bioreactor (MBR) was developed to achieve nitrogen removal by combining nitrification and denitrification conditions in one reactor. The activated sludge was alternated between aerobic and anoxic conditions using peristaltic pump. The biomass concentration and floc morphological properties were observed to be similar in anoxic and aerobic compartments. However, the homogeneous ...

Dec. 1, 2010

By IWA Publishing

Ethinylestradiol removal in a conventional and a simultaneous nitrification–denitrification membrane bioreactor

The removal of a synthetic estrogen 17α-ethinylestradiol (EE2) was investigated in submerged membrane bioreactors (MBRs) with simultaneous nitrification–denitrification (SND) and conventional nitrification. The influent EE2 concentration was 500 ng/L as EE2. Using a yeast estrogen screen test, the conventional-MBR (C-MBR) and SND MBR (SND-MBR) removed 57 and 58% of the estrogenic activity (EA) ...

Dec. 1, 2011

By IWA Publishing

Plot testing of mbbr and ifas treatment processes for nitrification and denitrification at the mamaroneck wwtp

ABSTRACT The Mamaroneck WWTP is one of four WWTPs in Westchester County that the New York State Department of Environmental Conservation (NYSDEC), through its State Pollution Discharge Elimination System (SPDES), imposed Waste Load Allocation (WLA) limits for nitrogen because of its discharge into the ...

Oct. 13, 2007

By Water Environment Federation (WEF)

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