NOx control Articles

South African wastewater facility saves energy and meets nutrient removal regulations Many small communities across the U.S. and around the globe are struggling to meet more stringent nitrification of ammonia requirements on a tighter budget. When a South African community could not meet its state requirements and struggled with a failing rotor disc system, the town’s officials ...

Jun. 2, 2015

By Aeration Industries International (AII)

An innovative granular sludge deammonification system was incorporated into a conventional-activated sludge process. The process incorporated an internal baffle in the bioreactor for continuous separation of granular biomass from flocculent biomass, which allowed for controlling the solids retention time of flocculent sludge. The process was evaluated for ammonium removal from municipal digested ...

Apr. 27, 2015

By IWA Publishing

The main challenge in implementing shortcut nitrogen removal processes for mainstream wastewater treatment is the out-selection of nitrite oxidizing bacteria (NOB) to limit nitrate production. A model-based approach was utilized to simulate the impact of individual features of process control strategies to achieve NO−2-N shunt via NOB ...

Mar. 27, 2015

By IWA Publishing

An upflow anaerobic biofilter (AF) was developed to investigate anaerobic ammonium-oxidizing (ANAMMOX) efficiency in treating low-strength wastewater at ambient temperature (15.3–23.2 °C). Denaturing gradient gel electrophoresis (DGGE) and fluorescence in situ hybridization were used to investigate treatment effects on the microbial community. Stepwise decreases in influent ...

Mar. 16, 2015

By IWA Publishing

The present experimental work is a study of the impact of ambient air temperature and the injection timing of diesel fuel on reduction of engine–out emissions of DI diesel engine, operating under the influence of oxygen enriched hydrogen gas. Here the oxygen enriched hydrogen gas was produced by the process of water electrolysis. The produced gas was aspirated into the combustion process of ...

Jan. 20, 2015

By Inderscience Publishers

Proper characterization of nanoparticle (NP) interactions with environmentally relevant bacteria under representative conditions is necessary to enable their sustainable manufacture, use, and disposal. Previous nanotoxicology research based on planktonic growth does not adequately explore biofilms, which serve as the predominant mode of bacterial growth in natural and engineered environments. ...

Dec. 30, 2014

By John Wiley & Sons, Ltd.

Abstract SHARON8 is a very cost-effective treatment system for the total removal of nitrogen components, through nitriflcation/denithfication. from wastewater flow streams containing high concentrations of nitrogen. The system is used for the treatment of municipal wastewater side streams from both dewatered digested primary sludge and waste activated biosolids to achieve high total ...

Nov. 13, 2014

By Mixing & Mass Transfer Technologies LLC

In this study, two horizontal subsurface-flow constructed wetlands (CWs) (planted and unplanted) were constructed and compared to investigate the effects of vegetation on nitrogen removal and anammox (anaerobic ammonium oxidation) spatial distribution and enrichment. Calamus (Acorus calamus L.), which has a large root system, was selected as the vegetation. Removal of total nitrogen from the ...

Oct. 29, 2014

By IWA Publishing

Numerical simulation is currently used to help design low NOx devices for aircraft engines. In order to improve the prediction of pollutant species, combustion models based on tabulated chemistry have been commonly used in recent years. However, the short time scales of usual flamelet manifolds can lead to errors concerning the NO prediction in post flame area, as shown in this paper. Thus, a new ...

Oct. 28, 2014

By Inderscience Publishers

Conventional and single-stage anaerobic ammonium oxidation (ANAMMOX) was carried out in bench-scale reactors to treat chlortetracycline (CTC) wastewater. The total nitrogen (TN) removal efficiency and rate for conventional ANAMMOX was 66.6 ± 5.9% and 2.7 ± 0.2 kg N/(m3·d), respectively, which was 58.6 ± 3.8% and 1.2 ± 0.1 kg ...

Sep. 29, 2014

By IWA Publishing

Example: Uranium enrichment Similar tasks: Nitric acid caprolactam production When uranium ore is converted into uranium hexafluoride (UF6) for uranium enrichment employing the diffusion process, or also when producing nitric acid and nitrogenous fertilizers for farming, laughing gas is produced by several undesirable side reactions. Thermal decomposition ...

Aug. 30, 2014

By Chemisch Thermische Prozesstechnik GmbH / CTP Air Pollution Control

TiO 2 films codoped with V cations and N anions were synthesised by RF-magnetron sputtering. The incorporation of V and N in TiO 2 lattice produces isolated energy levels near the conduction and valence bands, respectively, causing an effective narrowing of the band gap to 2.5 eV. Recombination of photo-charges was reduced by depositing multilayer films of indium tin oxide ...

Aug. 18, 2014

By Inderscience Publishers

Sludge ozonation is a promising technology for dealing with the increasing challenge of excess sludge treatment and disposal. However, nitrogen behavior during sludge ozonation and subsequent biological removal remains unclear. To clarify the feasibility and stability of oxidizing organic nitrogen (released during sludge ozonation) in the bioreactor (but not during ozonation), and the best ...

Jul. 23, 2014

By IWA Publishing

This report describes the most recent emission inventory information provided by the Member States of the European Union (EU) at the end of 2013 under Directive 2001/81/EC, the National Emission Ceilings Directive (NECD) (EC, 2001). The NECD requires all 28 EU Member States to report information annually on emissions of four significant air pollutants: nitrogen oxides (NOX), non.methane volatile ...

Jun. 12, 2014

By European Environment Agency (EEA)

KCP&L’s LaCygne Generating Station provides 1,532 MW of peak power to customers from the site south of Kansas City. LaCygne Unit 1 is an 815 MW B&W cyclone boiler with Over-Fire Air (OFA) and SCR NOx controls, and the second oldest WFGD installation in the country. LaCygne Unit 2 is a 717 MW B&W PC boiler with Low NOx Burners (LNB), OFA, and ESP particulate control. ...

May 6, 2014

By Fuel Tech, Inc.

A novel enhanced biological phosphorus removal (EBPR) system, which combined the intermittent feeding design with an anaerobic selector, was examined using on-line oxidation reduction potential (ORP), nitrate and ammonium probes. Two experimental periods were investigated: the aerobic and anoxic phases were set at 40 and 20 minutes respectively for period I, and set at 30 and 30 minutes for ...

Apr. 24, 2014

By IWA Publishing

A modified sludge process reduction activated sludge (SPRAS) technology was developed by inserting a sludge process reduction (SPR) module, composed of an aeration tank and a settler, before the activated sludge system was proposed in this study. Compared with the anaerobic/anoxic/aerobic (AAO) process, the SPRAS resulted in a remarkable decrease in sludge production by 76.6%; sludge ...

Mar. 13, 2014

By IWA Publishing

ANITA™Mox is a Veolia process using moving-bed biofilm reactor (MBBR) technology tested and validated in full-scale for energy- and cost-effective autotrophic N-removal from sidestream effluent using anammox (ANaerobic AMMonium OXidation) bacteria. In order to increase the ANITA™Mox process performances under different operating conditions (e.g. mainstream and sidestream ...

Mar. 13, 2014

By IWA Publishing

Criterion is the world's largest supplier of catalysis for hydroprocessing, including hydrotreating applications.  The company is also a leading supplier of reforming and specialty catalysis for the refining industry. Criterion's facility in Azusa, CA installed a Tri-NOx Mult-Chem scrubber with a 3000 cfm capacity at 250 lbs/hr of NOx. The system has four polypropylene columns, three of ...

Jan. 9, 2014

By Industrial Air Solutions, Inc.

In this study, a biological system consisting of an up-flow anaerobic sludge blanket (UASB) and anoxic–oxic (A/O) reactor was established for the advanced treatment of high ammonium urban landfill leachate. The inhibitory effect of free ammonia (FA) and free nitrous acid (FNA) on the nitrifying bacterial activity was used to achieve stable nitritation in the A/O reactor. The results ...

Nov. 13, 2013

By IWA Publishing