Wyniki wyszukiwania - Biblioteka Nauki

1

Krystalizacja struwitu z roztworów przy pH 9,5 i zmiennych stężeniach analizowanych składników

100%

Czajkowska J.

Przegląd Naukowy Inżynieria i Kształtowanie Środowiska

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2012

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tom Vol. 21, No. 1

38--45

PL

W pracy przedstawiono wyniki badań krystalizacji uwodnionego fosforanu amonowomagnezowego (struwitu), o wzorze chemicznym MgNH4PO4·6H2O, który przy wystąpieniu specyficznych warunków ma tendencję tworzyć się w linii osadowej oczyszczalni ścieków. Badania zostały wykonane w Laboratorium Chemii i Technologii Wody i Ścieków SGGW w Warszawie. Wytrącony struwit został uzyskany z roztworu sporządzonego na bazie następujących związków: NH4Cl (źródło NH4 + ), MgSO4·7H2O (źródło Mg2+) i KH2PO4 (źródło PO4 3-) oraz wody destylowanej przy podniesieniu pH do ~9,5. Badania zostały wykonane przy założeniu trzech zmiennych niezależnych tj.: stężenie jonów NH4 + , stężenie jonów PO4 3- oraz jony Mg2+. Celem badań było określenie stężeń jonów magnezu, przy których występuje krystalizacja struwitu. Przeprowadzone badania stanowią kontynuację rozpoczętych badań nad warunkami krystalizacji struwitu

EN

The paper presents the results of crystallization of hydrated magnesium ammonium phosphate (struvite), with the chemical formula MgNH4PO4 · 6H2O, which by the occurrence of specific conditions has a tendency to create in a line of wastewater treatment plant sludge. Tests were performed at the Laboratory of Chemistry and Technology of Water and Sewage of Warsaw University of Life Sciences. Precipitated struvite was obtained from a solution prepared on the basis of the following compounds: NH4Cl (NH4 + source), MgSO4 · 7H2O (Mg2+ source) and KH2PO4 (PO4 3- source) and distilled water by raising the pH to ~ 9.5. Tests were performed assuming three independent variables, namely: the concentration of NH4 + ions, the concentration of PO4 3- ions and Mg2+ ions. The objective was to determine the concentration of magnesium ions, which occurs by struvite crystallization. The studies are a continuation of initiated research about conditions of struvite crystallization.

2

Efficient control of coagulant dosing in wastewater treatment

100%

Ratnaweera H. , Smoczynski L. , Lewandowski A. , Bielecka M.

Zeszyty Problemowe Postępów Nauk Rolniczych

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2005

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tom 505

EN

Coagulant dosing control (CDC) is necessary to ensure stable treated water quality and to reduce chemical costs both in drinking and wastewater treatment plants. The rapid development in online sensors and equipment as well as control strategies has triggered a significant development in CDC. Software sensors, streaming current detectors, charge titration units, potential dispersion analyzers etc. are now successfully used. Despite the significant advancement in the introduction and use of these novel techniques, most plants still relay on simple CDC techniques like flow proportional dosing, leaving great opportunities to reduce the coagulant costs, sludge treatment costs while achieving better treatment efficiencies overall. The paper presents a novel concept to optimize coagulant dosing control in wastewater treatment plants, and an intention to develop a widely available solution using a Polish-Norwegian Research & Development venture.

PL

Kontrola dozowania koagulantu (KDK) jest konieczna w celu zapewnienia stabilnej jakości wody, jak i obniżenia kosztów zarówno w stacjach uzdatniania wody, jak i w oczyszczalniach ścieków. Wraz z wielkim postępem w strategii i technologii tzw. czujników „online” obserwuje się również znaczny rozwój w zakresie KDK. Zdecydowanie zwiększa się zakres czujników procesorowych, czujników w ciągłym przepływie, zestawów miareczkujących do oznaczania ładunku, analizatorów despersji itp. W przeciwieństwie do znacznego zaawansowania we wprowadzaniu i zastosowaniu tych nowatorskich technik, większość oczyszczalni ciągle opiera się na prostych systemach KDK, typu ciągłego dozowania proporcjonalnego, nie uwzględniając wielkich możliwości redukcji kosztów zużycia koagulantu i obróbki osadów, które istotnie wpływają na efektywność pracy oczyszczalni. Praca niniejsza przedstawia nowatorską koncepcję optymalizowania dawki koagulantu w oczyszczalniach ścieków oraz możliwości rozszerzenia dostępności tych rozwiązań w Polsce poprzez Polsko-Norweską Instytucję Naukowo-Rozwojową.

3

Coagulation of wastewater containing reactive dyes with the use of polyaluminium chloride [PAC]

100%

Klimiuk E. , Filipkowska U. , Libecki B.

Polish Journal of Environmental Studies

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1999

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tom 08

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nr 2

4

Biodegradation of used metalworking fluids in wastewater treatment

100%

Muszynski A. , Lebkowska M.

Polish Journal of Environmental Studies

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2005

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tom 14

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nr 1

EN

A biotechnological method for metalworking fluids (MWF) wastewater treatment was developed. The research, conducted in a lab-scale bioreactor, proved that the process of eliminating pollutants from MWF wastewater proceeds effectively when the following are applied: multiple reinoculating of biomass by adding active microorganisms into the bioreactor, immobilizing microorganisms on the PVC foam carrier, and carrying out the process in the anoxic/aerobic conditions at phase durations of 0.5 and 5.5 hours, respectively. The above parameters allowed us to obtain the following eliminations: 87% of chemical oxygen demand (COD), 97% of biochemical oxygen demand (BOD5 ), 98% of petroleum ether extractable organic (PEEO) and more than 96% of total content of hydrocarbons determined by infrared (IR) spectrophotometry. The chromatographic analyses showed almost complete reduction of oily hydrocarbons contained in the used MWF.

5

Issledovanie vlijanija aehracii na pokazateli stochnykh vod i aktivnogo ila na vykhode iz aehrotenka

88%

Gornostal' S. , Petukhova E. , Ajjrapetjan T.

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tom 17

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nr 6

6

A survey on nitrogen and phosphor compound variation processes in wastewater stabilization ponds

88%

Pirsaheb M. , Fazlzadehdavil M. , Hazrati S. , Sharafi K. , Khodadadi T. , Safari Y.

Polish Journal of Environmental Studies

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2014

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tom 23

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nr 3

EN

Being economical has increased utilization of stabilization ponds to remove different contaminants from wastewater in proper weather conditions. Our current study investigates variations of nitrogen and phosphorous compound concentrations in effluent of wastewater stabilization ponds. 60 samples were taken from raw wastewater, anaerobic pond (AP) effluent, primary and secondary facultative ponds (PFP and SFP), and effluent of final ponds in weekly intervals for 3 months. Samples were examined based on standard methods (20th edition) for the examination of water and wastewater. Nitrogen kjeldahl removal output due to the AP, PFP, SFP, and the whole system were 20.6±4.9, 6.6±3.4, 13.4±9.5, and 47.7±9.1%, respectively. Nitrite removal output due to the PFP, SFP, and the whole system were 30.1±8.8, 36.3±9.8, and 58.8±5.2%, respectively. Respective values for phosphor removal output in AP and SFP, and the whole system were 21.8±10.3%, 13.3±10.1%, and 20.9±17.1%. However, nitrite concentrations in all samples from AP effluent and phosphor levels in all samples from PFP effluent increased compared with those of influent. The results showed that AP plays an important role in removal of organic nitrogen and phosphorous compounds. While the whole system output in nitrogen compound removal was 58.8±5.2%, phosphor removal output showed low efficiency (20.9±17.1%). Increasing the number of complete ponds is suggested for increasing phosphor removal efficiency.

7

Toxic effect of chemical disinfection of wastewater on freshwater ciliates

88%

Madoni P. , Gorbi G. , Taje E.

Acta Protozoologica

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1998

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tom 37

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nr 4

8

Wastewater flocculation using a new hybrid copolymer: modeling and optimization by response surface methodology

75%

Dawood A. S. , Li Y.

Polish Journal of Environmental Studies

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2014

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tom 23

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nr 1

EN

A new hybrid inorganic-organic copolymer, aluminum chloride-poly(acrylamide-co-acrylic acid), was prepared using the free radical polymerization method and employed in this study. The hybrid copolymer was characterized by Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), and energy-dispersive x-ray spectroscopy (EDS). This hybrid copolymer was used in the flocculation of wastewater as a new flocculant. The design variables in the flocculation experiments were hybrid copolymer dosage and wastewater pH. The central composite design (CCD) for the response surface methodology (RSM) approach was used to develop a mathematical model and to optimize the parameters of the flocculation process in terms of optimal removal of chemical oxygen demand (COD), total suspended solids (TSS), and turbidity. After applying the analysis of variance (ANOVA) of all quadratic models, it was found that the obtained value of the correlation coefficient (R2) was more than 0.98 for all models. The optimum hybrid copolymer dosage was 125 mg/l and the optimum pH 7.55. Under these optimum values, the wastewater treatment achieved 97%, 98.6%, and 88.6% removal of turbidity, TSS, and COD, respectively.

9

Optimizacija khimicheskikh komponentov pri reagentnojj obrabotke stochnykh vod

75%

Ehpojan S. , Movchan S.

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tom 17

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nr 6

10

Influence of some properties of potential sorbent on P-removal from domestic wastewater

75%

Karczmarczyk A.

Annals of Warsaw Agricultural University. Land Reclamation

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2000

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tom 30

59-65

11

Krystalizacja struwitu ze ścieków syntetycznych w instalacji doświadczalnej w warunkach przepływowych

75%

Czajkowska J. , Siwiec T.

Przegląd Naukowy Inżynieria i Kształtowanie Środowiska

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2011

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tom Vol. 20, No. 2

130--139

PL

W pracy przedstawiono problem związany ze spontaniczną krystalizacją uwodnionego fosforanu amonowo-magnezowego (struwitu), o wzorze chemicznym MgNH4PO4 ·6H2O często tworzącego się w linii osadowej oczyszczalni ścieków. Anonsowane badania realizowane były przy wykorzystaniu instalacji doświadczalnej do krystalizacji struwitu w skali laboratoryjnej w warunkach przepływowych. Struwitu wytrącany w rurociągu uzyskiwany został z roztworu sporządzonego na bazie następujących związków: NH4Cl (źródło NH4 + ), MgSO4 (źródło Mg2+) i KH2PO4 (źródło PO4 3-). Parametrami zmiennymi była prędkość przepływu ścieków oraz odczyn. Celem nadrzędnym charakteryzowanych badań jest określenie warunków minimalizacji ilości struwitu.

EN

Crystallization of struvite from synthetic wastewater in experimental installation under flow conditions. In this review paper are presented the issue of struvite in sewage treatment plants and the results of struvite crystallization conditions, depending on the flow velocity and pH. Our results show a high complexity of the issues concerning the formation of struvite in pipes and confirm the fact that the crystallizing of struvite decreases in diameter pipelines. It was also found that with increasing speed and pH increases the amount of produced struvite.

12

Phenol oxidation with hydrogen peroxide using Cu/ZSM5 and Cu/Y5 catalysts

75%

Valkaj K. , Wittine O. , Margeta K. , Granato T. , Katović A. , Zrnčević S.

Polish Journal of Chemical Technology

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2011

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tom 13

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nr 3

28-36

EN

In this work, catalytic activity and stability of Cu/Y5 and Cu/ZSM5 zeolites in phenol oxidation with hydrogen peroxide were examined. The catalyst samples were prepared by the ion exchange method of the protonic form of commercial zeolites. The catalysts were characterized by the powder X-ray diffraction (XRD), AAS, while the adsorption techniques were used to measure the specific surface area.The thermal programmed desorption of NH3 (NH3-TPD) was used for measuring the total number of acid sites formed on the surface of zeolites.Catalytic performance of the prepared samples was monitored in terms of phenol, hydrogen peroxide and total organic carbon (TOC) conversion, by-product distribution and a degree of copper leached into the aqueous solution.It was found that the activity of Cu/Y5 catalyst was generally higher than that of Cu/ZSM5 and that unlike Cu/ZSM5, Cu/Y5 catalyzed phenol oxidation more completely.

13

The management and development of constructed wetlands for treatment of petrochemical waste waters in Hungary: 35 years of experience

75%

Lakatos G. , Veres Z. , Kundrat J. , Meszaros I.

International Journal of Ecohydrology and Hydrobiology

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2014

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tom 14

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nr 1

14

Variability of COD and TKN fractions of combined wastewater

75%

Zawilski M. , Brzezinska A.

Polish Journal of Environmental Studies

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2009

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tom 18

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nr 3

501-505

EN

Our paper analyzes the quality of combined wastewater in the aspect of its biological treatment. Fractions of chemical oxygen demand (COD) and total Kjeldahl nitrogen (TKN) in the inflow to the Group Wastewater Treatment Plant in Łódź were determined. The research revealed a distinct increase of inert fractions during wet weather caused by an increasing portion of contaminants bound with suspended solids.

15

Application of Euglena gracilis in wastewater treatment processes

75%

Nezbrytska I. , Shamanskyi S. , Pavliukh L. , Gorbunova Z.

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nr 4

16

Dairy wastewater treatment by two-stage activated-sludge with a sequencing batch reactor [SBR]

75%

Janczukowicz W. , Krzemieniewski M. , Pesta J. , Szewczyk M.

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2001

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tom 08

111-121

17

Solution of water and sewage management in plastics recycling

75%

Jamski P.

Polish Technical Review

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2024

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tom No. 1

22--26

EN

In the time of dynamic development of polymer material’s recycling, the effective treatment of waste water generated during the process of cleaning the above mentioned renewable raw materials has become a very important problem. Recycling of polymer plastics allows the reuse of raw materials which, in turn, contributes to reduction of demand for new materials. In order to play a role of sustainable solution, industry must, however, focus it’s attention not only on production of recyclates but also on the effective and safe treatment of water used during the manufacturing processes. In this document we will discuss the complex solution of the problem mentioned above. This paper presents authorial solution in respect to treatment of waste water, arising during the process of plastics cleaning subjected to the recycling. Attributing to the application of advanced technologies and strategies, suggested solution is aimed not only at effective removal of contamination but also, to minimize the quantity of consumed water and the resulting waste. Discussed solution is a step towards sustainable processing of plastics, limiting it’s negative effect on the environment, and, at the same time, keeping the high standard of purity of the produced material.

18

The influence of the different intensity electromagnetic field on phosphorus removal from dairy wastewater in the steel packing system

75%

Krzemieniewski M. , Debowski M. , Janczukowicz W. , Pesta J.

Polish Journal of Natural Sciences

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2003

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tom 14

19

Evaluation of indicator bacteria removal in wastewater treatment processes

75%

Olanczuk-Neyman K. , Stosik-Fleszar H. , Mikolajski S.

Polish Journal of Environmental Studies

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2001

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tom 10

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nr 6

EN

The results of elimination of total coliforms, E.coli and enterococci from wastewater during mechanical-chemical treatment as well as biological treatment operated in the MUCT system in a full-scale wastewater treatment plant are presented. It was proved that the change of treatment technology resulted in improving bacteria removal efficiency - reduction of the number of total coliforms increased from 0.9 log(10) to 2.5 log(10) and E. coli from 1.0 log(10) to 2.3 log(10). The UV disinfection of effluent from the MUCT system allowed for further reduction of the number of bacteria to 3.4 log(10) when the dose of UV radiation equal to 40 mWs/cm(2) was applied and to 3.8 log(10) at the dose of 52 mWs/cm(2). The geometric mean number of bacteria in the effluent after UV disinfection with the dose 40 mWs/cm(2) was below 50/100 ml of total coliforms, 15/100 ml of E.coli and approximately 30/100 ml of enterococci.

20

Effects of shock loads of salt on protozoan communities of activated sludge

75%

Salvado H. , Mas M. , Menendez S. , Gracia P.

Acta Protozoologica

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2001

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tom 40

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nr 3