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Simultaneous Nitrification and Denitrification in an SBR with a Modified Cycle During Reject Water Treatment

.C., Lee, L.L., Chang, C.N., & Chao A.C. (2007). Control of carbon and ammonium ratio for simultaneous nitrification and denitrification in a sequencing batch bioreactor, International Biodeterioration and Biodegradation , 59, 1-7. [5] Coelho, M.A.Z., Russo, C., & Araùjo O.Q.F. (2000). Optimalization of a sequencing batch reactor for biological nitrogen removal, Water Research , 34, 2809-2817. [6] Dytczak, M.A., Londry, K.L., & Oleszkiewicz J.A. (2008 a). Activated sludge operational regime has significant impact on the type of

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Assessment of the influences of climate variability on nitrogen leaching rate into groundwater

za obdobje 2012-2015. Ljubljana: Ministrstvo za okolje in prostor, [cited 17. 6. 2017]. Available on: <http://www.mop.gov.si/>. [9] Wendland, F., Kunkel, R., Gömann, H., Kreins, P. (2007): Water fluxes and diffuse nitrate pollution at the river basin scale: Interfaces for the coupling of agroeconomical models with hydrological approaches. Water Science and Technology, 3, pp. 133-142. [10] Heinen, M. (2006): Simplified denitrification models: Overview and properties. Geoderma, 133(3), pp. 444-463. [11] Boyer, E

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Nitrogen Transportation and Transformation Under Different Soil Water and Salinity Conditions

.1371/journal.pone.0095011. [38] Rysgaard S, Thastum P, Dalsgaard T, Christensen P B, Sloth N P. Effects of salinity on NH 4 + adsorption capacity, nitrification, and denitrification in Danish estuarine sediments. Estuaries. 1999;22(1):21-30. DOI: 10.2307/1352923. [39] Tripathi S, Kumari S, Chakraborty A, Gupta A, Chakrabarti K, Bandyapadhyay BK. Microbial biomass and its activities in salt-affected coastal soils. Biol Fert Soils. 2006;42(3):273-277. DOI: 10.1007/s00374-005-0037-6. [40] Wong VN, Dalal RC, Greene RS. Salinity and sodicity effects on

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The Use of Constructed Wetlands for Nitrogen Removal from Agricultural Drainage: a Review

nonpoint source pollution in agriculture with constructed and restored wetlands. Advances in Agronomy, 108, 1-76. doi: 10.1016/S0065-2113(10)08001-6. Phipps RG, Crumpton WG (1994): Factors affecting nitrogen loss in experimental wetlands with different hydrologic loads. Ecological Engineering, 3, 399-408. doi: 10.1016/0925-8574(94)00009-3. Poe AC, Piehler MF, Thompson SP, Pearl HW (2003): Denitrification in a constructed wetland receiving agricultural runoff. Wetlands, 23, 817-826. doi: 10

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Effect of Salinity on Soil Respiration and Nitrogen Dynamics

;257(1-4):221-231 DOI: 10.1016/j.aquaculture.2006.02.075. [18] Ingwersen J, Butterbach-Bahl K, Gasche R, Richter O, Papen H. Barometric process separation: New method for quantifying nitrification, denitrification, and nitrous oxide sources in soils. Soil Sci Soc Am J. 1999;63;117-128. [19] Ingwersen J, Schwarz U, Stange CF, Ju X, Streck T. Shortcomings in the commercialized barometric process separation measuring system. Soil Biol Biochem. 2008;72(1):135-142. DOI: 10.2136/sssaj2007.0092. [20] Butterly CR, Marschner P, McNeill AM

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Simultaneous ammonium and nitrate removal by a modified intermittently aerated sequencing batch reactor (SBR) with multiple filling events

and denitrification for Aquatic Habitat in International Space Station. Life Sci. Space Res. 1, 89-95. DOI: 10.1016/j.lssr.2014.02.002. 13. Kampschreur, M.J., Temmink, H., Kleerebezem, R., Jetten, M.S.M. & van Loosdrecht, M.C.M. (2009). Nitrous oxide emission during wastewater treatment. Water Res. 43(17), 4093-4103. DOI: 10.1016/j.watres.2009.03.001. 14. Guo, J., Yang, Q., Peng, Y., Yang, A. & Wang, H. (2007). Biological nitrogen removal with real-time control using step- -feed SBR technology. Enzyme Microb. Tech. 40(6), 1564

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Current Trends in Biological Wastewater Treatment

Abstract

Waste water treatment plants are complex systems consisting of construction, hydro-mechanical, electrical, monitoring and automation equipment. Monitoring activities emphasize that the processes are dynamic; wastewater quality at the entering point of treatment plant varies in a wide range. Treatment technologies adopted must reduce major pollutants; that involves nitrification-denitrification processes and biological and chemical reduction of phosphorus through mechanical-chemical-biological treatment pathways. Increasing the activated sludge concentration in a wastewater treatment plant is an effective method by altering the process dynamics and by reducing the produced sludge volume. There are proposed and discussed in terms of technical and cost efficiency different technological wastewater treatment schemes. In Romania, wastewater treatment plants and sewage systems operating involve processes based on the new systems overrated, there is mandatory to diminish quantities in water supply systems and to exclude improperly working of wastewater pre-treatment stations. Those operations impose technological measures ensuring efficient functioning regardless the service conditions.

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Simulation and Experimental Study of SCR Injection System

Abstract

According to actual engineering test, we design a linear controlled spray ammonia grille, and apply it to the SCR injection system of ship tail gas treatment. In this paper, the geometric model of ammonia injection grid was built in the flue of diesel engine, and the effects of spray atomization, ammonia uniformity and urea droplet distribution on spray atomization were simulated. Then the test bench was set up to observe the injection status of the ammonia injection grille. The NOx content of the outlet was measured by the original data of the flue gas, and the experimental data were processed. We calculate the denitrification rate by taking the average value to verify the correctness of the spray ammonia grid scheme.

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Description and Verification of the Contaminat Transport Models in Groundwater (Theory And Practice)

Abstract

This paper presents a general overview of 2D mathematical models for both the inorganic and the organic contaminants moving in an aquifer, taking into consideration the most important processes that occur in the ground. These processes affect, to a different extent, the concentration reduction values for the contaminants moving in a groundwater. In this analysis, the following processes have been taken into consideration: reversible physical non-linear adsorption, chemical and biological reactions (as biodegradation/biological denitrification) and radioactive decay (for moving radionuclides). Based on these 2D contaminant transport models it has been possible to calculate numerically the dimensionless concentration values with and without all the chosen processes in relation to both the chosen natural site (piezometers) and the chosen contaminants.In this paper, it has also been possible to compare all the numerically calculated concentration values to the measured concentration ones (in the chosen earlier piezometers) in relation to both the new unpublished measurement series of May 1982 and the new set of parameters used in these 2D contaminant transport models (as practical verification of these models).

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Installations for cleaning exhaust fumes from dust–gas pollutants

Chemicals – Ammonia, Acids and Fertilisers” specifies that selective catalytic reduction (SCR), selective non-catalytic reduction (SNCR) and their combination are the best available methods for denitrification of exhaust gases alongside primary methods [ Best Available Techniques … 2016 ]. The principle of exhaust gases denitrification of nitrogen oxides by the SNCR method is based on the use bringing the reagent to the fumes and the next reaction of nitrogen oxides with ammonia or carbamide. The use of this technique allows the inhibition of not only the reduced NO x

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