Wyniki wyszukiwania - BazTech

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Physicochemical methods of nitrates removal from wastewater

Żołnierczyk Maciej, Barbusiński Krzysztof

Architecture Civil Engineering Environment

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2019

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Vol. 12, no. 3

153--159

EN

Nitrate(V) ions in surface water and sewage are pollutants, which excessive concentration have a negative impact on aquatic ecosystems. Due to the chemical properties, removal of nitrates from wastewater is a difficult process. In the municipal sector, biological denitrification (activated sludge) is the most commonly used process. However, in the case of industrial wastewater, where inhibiting substances or substances toxic to microorganisms are present in wastewater, it is necessary to use other types of methods. It is possible to distinguish here methods based on physicochemical processes, in particular: physicochemical separation, chemical or electrochemical reduction and oxidation under supercritical conditions. At present, membrane methods and ion exchange processes are used mainly in the industrial sector because of the high knowledge of the technology and the amount of applications used. Intensive studies are also being carried out on methods using chemical reduction processes, where greatest advantage is the ability to transform nitrates to neutral molecular nitrogen.

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Analysis of the possible application of deammonification technology in the municipal wastewater treatment plant in Zabrze

Pęciak-Foryś Grażyna, Barbusiński Krzysztof, Filipek Krzysztof

Architecture Civil Engineering Environment

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2019

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Vol. 12, no. 4

115--123

EN

Due to eutrophication phenomena the modern wastewater plants are obliged to apply highly effective technologies to remove nutrient, i.e. nitrogen and phosphorous, substances. The biological methods to remove nitrogen in the processes of nitrification and denitrifications are successfully used in the main technological line (mainstream). It has been observed, however, that in technical design of activated sludge bioreactor the additional ammonia nitrogen load coming from fermented sludge dewatering effluents was not sufficiently considered. This load, of ca. 20-30% of a total nitrogen inflow, could interrupt the nitrogen removal process. Therefore, the sidestream ammonia nitrogen removal technologies have been widely applied. The operating problems and the ways to solve them in the “Śródmieście” WWTP in Zabrze, resulting from additional nitrogen load, coming from dewatering and thickening effluents, are described in the presented paper. Moreover, preliminary calculations of the DEMON® reactor volume, on the basis of actual nitrogen concentrations in the leachate, in order to implementation deammonification technology in the sidestream on a technical scale were also presented.

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In-situ nitrate remediation using nano iron/nickel particles

Tehrani M. R. F., Vossoughi M., Shamsai A.

Environment Protection Engineering

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2014

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Vol. 40, nr 3

75--86

EN

Originally, the application of nano zero valent iron/nickel (nZVI/Ni) particles for nitrate removal in porous media was studied. nZVI/Ni was prepared and employed in batch and continuous modes. Based on batch experiments, the reaction kinetics was consistent with the adsorption model by the order of 1–1.5. The variation of the kinetics order depends on pH and nickel content. So that highest reactivity was observed for nZVI with 10% of Ni at pH ≤ 3. Nitrate remediation in a continuous system was mostly influenced by seepage velocity, quantity and freshness of nZVI/Ni and particle size of porous media. In a batch mode, the maximum nitrate removal was 99% while in a continuous mode it did not exceed 85%.

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Wykorzystanie bakterii denitryfikacyjnych do usuwania azotanów z wód podziemnych

Grabińska-Łoniewska A.

Informacja Instal

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1999

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Nr 5 (183)

14-16

PL

W artykule omówiono aspekt sanitarno-higieniczny występowania ponad normatywnych ilości azotanów w wodach powierzchniowych wykorzystywa¬nych do celów wodociągowych oraz wpływ tych związków na zdrowie ludzi. Podano krótką charakterystykę biologicznych metod usuwania azotanów z wód przeznaczonych do picia, z wykorzystaniem denitryfikacyjnych bakterii auto i heterotroficznych. Omówiono mechanizm desymilacyjnych przemian azotanów zachodzących przy udziale obu ww. grup bakterii, główne czynniki abiotyczne wpływające na przebieg procesu, a także wady i zalety mikrobiologicznych metod usuwania azotanów z wód.