total nitrogen Articles
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Nitrogen Determination in Tobacco
Nitrogen Determination in Tobacco according to the Kjeldahl Method It is considered that flavour and taste of smoke is correlated with the nitrogenous constituents. Accordingto Indian Central Tobacco Reseach Institute (CTRI) fluecured tobacco containing 1.6 to 2.3 % total nitrogen gives the most satisfying smoke, whereas the acceptable limit of total nitrogen is 1.0-3.0 %. High level of ...
By BUCHI
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Nitrogen balance and transformation in the nitrification process of coking wastewater and the influence on nitrification kinetics
This paper describes the total nitrogen balance, and the direction and degree of nitrogen transformation during the nitrification process of coking wastewater. According to the actual nitrification process, the conventional nitrification kinetic equation was amended. After 48 h of nitrification, the total nitrogen content remained almost the same with error less than 0.6%. The total ...
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Spatiotemporal distribution of nitrogen and phosphorus in alpine lakes in the Sanjiangyuan Region of the Tibetan Plateau
To provide a theoretical basis for alpine source lake protection, ten samples were taken from each lake annually from 2012 to 2015. Each year, the various species of nitrogen and phosphorus nutrients were measured. The average contents of nitrate nitrogen, ammonia nitrogen, nitrite nitrogen, total phosphorus, and total nitrogen in the four lakes are 0.195–0.0 mg/L, 0.038–0.143 mg/L, ...
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Remediation of polluted river water by biological contact oxidation process using two types of carriers
Biological contact oxidation technology was used to remediate the polluted river water in Hanyang, China. The purification effect of the polluted river water in three simulated rivers was investigated using two different carriers, i.e., AquaMats made in USA and semi flexible supports made in China. The results showed that when the hydraulic loading rate increased, purification effect in terms of ...
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Incremental sanitation improvement strategy: comparison of options for Hanoi, Vietnam
Urban sanitation issues should be tackled strategically, and may be addressed effectively when sewerage development is pursued in conjunction with complementary sanitation measures. Five sanitation improvement scenarios employing sewerage, night-soil collection-and-treatment (NSCT) system, and/or septic-tank improvement by annual desludging were analyzed from the perspective of COD loads, total ...
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Gresham Wisconsin Bio-Dome Pilot Study 2010
This article explores the results obtained from a mobile pilot unit in Gresham Wisconsin during the winter of 2010. The pilot unit was installed to October 2010 and ran through April of 2011. During the course of the study, the Bio-Dome was tested under various loading conditions and operating conditions. Samples were taken for both the influent and effluent of the lagoon. Samples were ...
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Introducing a New ASTM Method for the Determination of Total Nitrogen, and TKN by Calculation, in Water Samples
The USEPA Clean Water Act (CWA) requires national approval for all methods used for CWA compliance. There are approved methods for the determination of inorganic nitrogen (NO3-N, NO2-N, and NH3-N), and for organic nitrogen (TKN – NH3-N)2. There are no EPA approved methods for the determination of total nitrogen although it is a required parameter in many USEPA permits, including monitoring ...
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Eliminate TKN Digestions and Obtain Better Nutrient Data
Nitrogen and Phosphorus are the principal elements referred to when discussing nutrient pollution. Current, and past, efforts to control these pollutants have been generally inadequate. Efforts to date have been predominantly “regulation at the pipe” and have not addressed the non-point sources that are the root cause of elevated concentrations of nutrients in ground and surface ...
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Quantitative identification of riverine nitrogen from point, direct runoff and base flow sources
We present a methodological example for quantifying the contributions of riverine total nitrogen (TN) from point, direct runoff and base flow sources by combining a recursive digital filter technique and statistical methods. First, we separated daily riverine flow into direct runoff and base flow using a recursive digital filter technique; then, a statistical model was established using daily ...
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Model-based methodology for the design of optimal control strategies in MBR plants
This paper proposes a model-based methodology that allows synthesising the most appropriate strategies for optimising the operation of wastewater treatment plants (WWTPs). The methodology is applied with the aim of maximising the nitrogen removal in membrane bioreactors (MBRs). The proposed procedure is based on a systematic approach composed of four steps. First, a sensitivity analysis of ...
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TOC and TN Measurements of Seawater
For pollution control of the ocean and in the research of the ocean environment, the measurement of total organic carbon (TOC) is regarded as an important index of organic contaminants contained in seawater. At the same time, the measurement of total nitrogen (TN), which is known to cause eutrophication, is also attracting attention for environmental pollution control and in ecological ...
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Aerator retrofit enables city to meet nitrogen limits - Case Study
Problem The City of Ocala, Fla., faced tighter effluent nitrogen limits due to the presence of springs in the St. John’s River basin. The city operates an Ovivo Carrousel plant. Solution Rather than add basins, the city retrofitted the Carrousel basins with dual-impeller Excell aerators and the automated internal recycle EliminatIR gate from Ovivo USA. Result The retrofits have allowed ...
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Ultrasonic pre-treatment of biosolid
Low-frequency and high-intensity ultrasonic treatment of biosolid is a good method for biosolid disintegration. So, as a pre-treatment method of anaerobic digestion, it may replace the hydrolysis. Thus, we studied the effect of ultrasonic disintegration of biosolid at different ultrasonic power densities. Results showed that the Soluble Chemical Oxygen Demand (SCOD), Total Nitrogen (TN), Total ...
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Reduction and control of total Nitrogen in a cheese factory case study
Treatment system enhancement using Microcat - DEN Denitrifiers - BSE 099 Problem The wastewater treatment system receiving wastewater from a cheese factory in the EU has difficulty meeting total nitrogen effluent discharge requirements. The wastewater flow rate is 2000 cubic meters per day. The treatment system consists of two sequencing batch reactors (SBRs) operating in parallel. Since the ...
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Influence of temperature and pH on nitrogen removal in a series of maturation ponds treating anaerobic effluent
This paper presents an evaluation of the influence of pH and temperature on nitrogen removal in a series of three shallow maturation ponds serving as post-treatment of upflow anaerobic sludge blanket (UASB) reactor effluent (approximately 200 population equivalent). Monitoring was from January 2007 to May 2009. Throughout this period, the ponds maintained relatively stable operational ...
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The effect of SRT on nitrate formation during autotrophic nitrogen removal of anaerobically treated wastewater
Autotrophic nitrogen removal, coupling nitritation (ammonium to nitrite) with anaerobic ammonium oxidation (anammox), offers a promising nitrogen-removal alternative, especially for post-treatment of anaerobically-treated wastewater. However, previous reports suggest that less than 90% total nitrogen removal should be expected with this process alone because over 10% of the ...
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TKN determination in water and waste water (Total Kjeldahl Nitrogen)
Colorimetric determination of TKN (Total Kjeldahl Nitrogen) in water and waste water according to the Kjeldahl method The determination of TKN (total Kjeldahl nitrogen) in water and waste water is a routine procedure for quality assurance and inspection. Here, a reliable procedure for the colorimetric TKN determination in water, according to ISO 5663, AOAC 973.48, and EPA 351.3 is introduced. ...
By BUCHI
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Estimation of the nonpoint source nitrogen load in a strongly disturbed watershed of the North China Plain
Identification of nonpoint source (NPS) pollution is a great challenge in the North China Plain, which has modified rivers and insufficient data. In this study, a simple and reasonable method was developed to estimate the total nitrogen (TN) load in rural areas of the North China Plain. The method was found to work well and produce results consistent with monitoring data when considering ...
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Application of the QUAL2K model to design an ecological purification scheme for treated effluent of a wastewater treatment plant
Treated effluent from wastewater treatment plants has become an important source of excess nutrients causing eutrophication in water. In this study, an ecological purification method was used to further treat eutrophic water. A three-season ecological purification scheme which comprised an emergent plant (Eme.), a submerged plant (Sub.) and a novel biological rope (Bio.), was designed for the ...
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Further contributions to nitrogen removal modelling in waste stabilization ponds
A large database from an experimental maturation pond system in Brazil was used to verify the agreement of field results with values predicted by some of the most widely accepted models to describe ammonium and total nitrogen (TN) removal in facultative and maturation ponds. The same database was used to derive a pH-independent linear model to predict ammonium removal in ponds, which was proved ...
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