Dissolved Ammonia Articles on Environmental XPRT

Dissolved ammonia adsorption in water using over burnt brick

The groundwater of Kathmandu Valley contains very high concentration of ammonia nitrogen which is in excessof WHO guideline value for drinking water. This study mainly focuses on the removal of ammonia nitrogen inwater by adsorption in locally available over burnt brick. The study was carried out in a 4.2 cm internal diametercolumn of 120 cm length packed with over burnt brick in up flow mode. ...

Aug. 26, 2007

Dissolved Ammonia Adsorption in Water Using Over Burnt Brick

The groundwater of Kathmandu Valley contains very high concentration of ammonia nitrogen which is in excess of WHO guideline value for drinking water. This study mainly focuses on the removal of ammonia nitrogen in water by adsorption in locally available over burnt brick. The study was carried out in a 4.2 cm internal diameter column of 120 cm length packed with over burnt brick in up flow mode. ...

Aug. 26, 2006

Competitive mechanism of ammonia, iron and manganese for dissolved oxygen using pilot-scale biofilter at different dissolved oxygen concentrations

In this study, the competitive mechanism of ammonia, iron and manganese for dissolved oxygen (DO) in a biofilter was investigated, and a new start-up method of a biofilter for ammonia, iron and manganese removal was approved, which can effectively shorten the start-up period from 3–4 months to 51 days. The results demonstrated that when DO was sufficient (about 8 mg · L−1), ammonia, iron and ...

Dec. 29, 2015

By IWA Publishing

Boiler Dissolved Oxygen Control

DISSOLVED OXYGEN CHEMISTRY Dissolved Oxygen (DO) is a measure of the amount of oxygen, usually thought of as a gas, that is dissolved in a liquid such as water. Oxygen is essential to life and is also the most common element found taking part in corrosion reactions. DO can be thought of as the fuel needed for the corrosion process to proceed. It is the corrosion reactions that necessitate ...

May 20, 2015

By IC Controls Ltd.

Syntrophy of aerobic and anaerobic ammonia oxidisers

Deammonification is known as an efficient and resource saving sidestream process option to remove the nitrogen load from sludge liquors. The transfer of the intermediate product nitrite between both syntrophic groups of organisms – aerobic and anaerobic ammonia oxidizers (AOB) – appears very sensitive to process conditions such as temperature, dissolved oxygen (DO) and operating nitrite level. ...

Apr. 1, 2010

By IWA Publishing

Dissolved Organic Nitrogen Measurement in Reclaimed Water

Dissolved organic nitrogen (DON) is an emerging concern for wastewater reclamation and reuse communities since DON may react with disinfectants to form carcinogenic nitrogenous disinfection byproducts (DBP) (e.g., haloacetonitriles, N-nitrosodimethylamine (NDMA)) and to affect the speciation of currently regulated DBP (trihalomethanes and haloacetic acids). Also, DON is present in proteins that ...

Oct. 21, 2006

By Water Environment Federation (WEF)

Biological ammonia removal field studies for drinking water treatment

In order to study the applicability of biological ammonia removal from drinking water, field experiments with 10 L/h flow rate were carried out at a case-study area, where raw water contained arsenic, iron, manganese, dissolved gases (methane, aggressive carbon dioxide) and ammonia. The technology applied at the waterworks consisted of potassium permanganate (KMnO4) dosing and rapid sand ...

Aug. 6, 2013

By IWA Publishing

Using ‘TransMembraneChemiSorption’ (TMCS) for Ammonia Removal from Industrial Waste Waters

Dissolved gases like NH3, H2S or NOx in waste water lead to contamination in the sewage system and high treatment costs for municipal waste water treatment plants. This translates into high penalty fees that are paid by the company discharging these contaminates into the sewage stream. In many cases a membranebased water treatment system can be justified because of a favorable pay back time. ...

Oct. 20, 2009

Electrochemically-assisted ammonia recovery from wastewater using a floating electrode

This work presents and explores a novel methodology for the removal and recovery of ammonia from wastewater based upon two mechanisms: electrochemical oxidation and a previously unreported electrochemically-assisted surface transfer mechanism. Recovery of ammonia is enabled by placing a porous cathodic electrode at the wastewater-air interface. In this configuration, the cathode creates local ...

Jan. 31, 2017

By IWA Publishing

Development of a Conceptual Model to Explain Apparent Free Ammonia Inhibition in Wastewater Systems

ABSTRACTThe common consensus among researchers and practitioners alike is that high free ammonia concentrations cause nitrite oxidizer inhibition in wastewater treatment systems. The work of Anthonisen et al. (1976), who produced an operational chart providing guidance on the free ammonia concentrations most likely to produce nitrite oxidizer inhibition, is considered by many to be the definitive ...

Oct. 22, 2006

By Water Environment Federation (WEF)

Low-pH Ammonia Oxidation at a Biological Nutrient Removal Facility

ABSTRACTMcAlpine Creek Wastewater Management Facility (MCWWMF), owned and operated by Charlotte Mecklenburg Utilities (CMU) of Charlotte, North Carolina, is permitted to treat 64 million gallons per day (mgd). Along with MCWWMF, three CMU treatment plants discharge effluent into the Catawba River just upstream of the South Carolina border. CMU worked with North and South Carolina regulators ...

Oct. 22, 2006

By Water Environment Federation (WEF)

Comparison of different two-pathway models for describing the combined effect of DO and nitrite on the nitrous oxide production by ammonia-oxidizing bacteria

The aim of this work is to compare the capability of two recently proposed two-pathway models for predicting nitrous oxide (N2O) production by ammonia-oxidizing bacteria (AOB) for varying ranges of dissolved oxygen (DO) and nitrite. The first model includes the electron carriers whereas the second model is based on direct coupling of electron donors and acceptors. Simulations are confronted to ...

Aug. 24, 2016

By IWA Publishing

The Use of Oxidation-Reduction Potential as a Means of Controlling Effluent Ammonia Concentration in an Extended Aeration Activated Sludge System

ABSTRACTThis study developed a strategy to control effluent ammonia from an activated sludge system, using oxidation-reduction potential. By controlling effluent ammonia concentrations, disinfection of treated wastewater is more cost effectively achieved by chloramination rather than break-point chlorination. The system under consideration was an extended aeration oxidation ditch. The study takes ...

Oct. 22, 2006

By Water Environment Federation (WEF)

Life history responses of Daphnia similoides simultaneously exposed to microcystin‐LR and ammonia and their post‐exposure recovery

Aquatic organisms often suffer episodic stress from cyanobacterial bloom‐derived concomitant and sometimes interactive stressors, and may recover when stressors terminate. To assess whether exposed Daphnia can quickly recover from combined toxicity of bloom‐derived stressors, we exposed Daphnia similoides to mixtures of ammonia (0, 0.37, and 0.58 mg L−1) and dissolved microcystin‐LR (0, 10, ...

Jul. 31, 2014

By John Wiley & Sons, Ltd.

Measuring concentrations of ammonia in ambient air or exhaust air stream using acid traps

Received for publication May 1, 2008. Strong acid solutions have been widely used in acid traps to determine concentrations of ammonia in ambient air or exhaust air stream. A literature survey indicates the method has a long history and a wide variation in use. Through a series of studies, this paper examines several factors including volume of the acid, depth of the acid, and airflow rate; that ...

Mar. 1, 2009

By Soil Science Society of America (SSSA)

Natural stressors in uncontaminated sediments of shallow freshwaters: The prevalence of sulfide, ammonia, and reduced iron

Potentially toxic levels of three naturally occurring chemical stressors (dissolved sulfide, ammonia, and iron) can occur in freshwater sediments, although their roles in shaping ecosystem structure (i.e., plant and animal communities) and function (e.g., biologically mediated elemental cycles) have received little study. This critical review discusses the prevalence and ecological effects of ...

Nov. 7, 2014

By John Wiley & Sons, Ltd.

The effects of different aeration modes on ammonia removal from sludge digester liquors in the nitritation–anammox process

The aim of this study was to determine the impact of continuous and intermittent aeration on the rate of ammonia removal in the combined nitritation–anammox process. This process was run in two parallel sequencing batch reactors (SBRs), with a working volume V = 10 L, treating sludge digester liquors from the Gdansk (Poland) wastewater treatment plant (WWTP). The ammonia oxidizing ...

Apr. 13, 2015

By IWA Publishing

Influence of dissolved oxygen concentration on the start-up of the anammox-based process: ELAN^®

The anammox-based process ELAN® was started-up in two different sequencing batch reactor (SBR) pilot plant reactors treating municipal anaerobic digester supernatant. The main difference in the operation of both reactors was the dissolved oxygen (DO) concentration in the bulk liquid. SBR-1 was started at a DO value of 0.4 mg O2/L whereas SBR-2 was started at DO values of 3.0 mg ...

Aug. 6, 2015

By IWA Publishing

Prediction of dissolved oxygen in reservoirs using adaptive network-based fuzzy inference system

Predicting water quality is the key factor in the water quality management of reservoirs. Since a large number of factors affect the water quality, traditional data processing methods are no longer good enough for solving the problem. The dissolved oxygen (DO) level is a measure of the health of the aquatic system and its prediction is very important. DO dynamics are highly nonlinear and ...

Jan. 1, 2012

By IWA Publishing

The study on chemical adsorption of dissolved oxygen on naturally formed co-oxides filter film in aqueous solution: combined characterization of XPS and TPD

The chemical adsorption of dissolved oxygen (DO) by co-oxide filter film-coated sands, formed through the filtration of ground water containing high concentrations of ammonia, manganese and iron, were studied. The results showed that the filter film consisted of silicates, carbonates, manganese and iron oxides and was constructed in a three-layer porous structure. The specific area of ...

Apr. 8, 2015

By IWA Publishing

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