Wyniki wyszukiwania

1

Treatment of liquid manure with activated sludge by adding municipal waste waters

100%

Roginski W.

Annals of Warsaw Agricultural University. Land Reclamation

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1987

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tom 23

2

Simultaneous application of Fenton's reaction and activated sludge method in sequencing batch reactor [SBR]

100%

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

Polish Journal of Natural Sciences

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2002

|

tom 12

3

Toxic effect of chemical disinfection of wastewater on freshwater ciliates

100%

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

4

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Efficiency of removal of heavy metals from municipal landfill leachate

86%

Koc-Jurczyk J., Jurczyk L.

Journal of Elementology

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2007

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tom 12

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nr 4

327-334

The aim of this study was to determine the rate of removal of heavy metals depending on a treatment method applied to leachate from a municipal waste landfill. After the biological treatment, concentrations of Cu, Zn and Ni were observed to have increased. Application of the reagent Fenton caused further growth in Cu, Zn, and also Pb concentrations. The highest concentrations of Cu, Zn and Ni were observed when the Fe2+: H2O2 ratio in Fenton was 1:3. The lowest concentrations of these heavy metals were observed at a 1:5 ratio of Fe2+ : H2O2. The concentration lead, for example, was over 30-fold higher than in raw leachate. There was not correlation between the COD values in raw leachate or in biologically or chemically processed leachate and the concentrations of the analysed metals.

5

Rheological measurements of disintegrated activated sludge

86%

Travnicek P., Vitez T., Junga P., Krcalova E., Sevcikova J., Marecek J., Machal P.

Polish Journal of Environmental Studies

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2013

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tom 22

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nr 4

Our paper deals with the description of the rheological properties of activated sewage sludge before and after disintegration. There is an assumption that disintegrated activated sewage sludge is able to change rheological properties. These changes probably cause the modification of the structure of activated sewage sludge after disintegration. The reason is that during disintegration, cell walls of organisms (from which the activated sewage sludge is composed) are disturbed. Currently there are not published many papers that deal with rheological properties of disintegrated activated sewage sludge. There is therefore no opportunity to confront our assumption with papers of other authors. The sample of activated sewage sludge was collected from aeration tank of the wastewater treatment plant for 10,000 population equivalent (PE). In our work the following rheological properties were described: temperature dependence on viscosity and the shear stress dependence on shear rate. On the basis of measured data Arrhenius mathematical model has been applied. By using this mathematical model the activation energy has been obtained.

6

Predvaritel'naja ochistka stochnykh vod s pomoshh'ju probioticheskikh sredstv

86%

Nasonkina N., Markin V.

Motrol. Motoryzacja i Energetyka Rolnictwa

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2014

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tom 16

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nr 6

7

Municipal wastewater treatment plant with activated sludge tanks aerated by CELPOX devices as a source of microbiological pollution of the atmosphere

86%

Filipkowska Z., Janczukowicz W., Krzemieniewski M., Pesta J.

Polish Journal of Environmental Studies

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2002

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tom 11

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nr 6

This paper characterizes the influence of a wastewater treatment plant with activated sludge aerated by CELPOX devices on the microbiological properties of the air at the plant grounds and in the vicinity. Field studies by the sedimentation method were carried out in seven measurement series in 2001. Sampling posts were each time set with regard to the current meteorological conditions like wind speed and wind direction. Microbiological analyses were comprised of: heterotrophic bacteria at 37şC and 26şC, hemolytic bacteria at 37şC and 10şC, staphylococci mannitol-fermenting and non-fermenting, Escherichia coli, coliforms Pseudomonas, enterococci, actinomycetes, yeasts and moulds. The results indicate that generally - in accordance with the Polish Standards [1,2] the air at the plant grounds and in its vicinity was not polluted. However, few spots (mostly in some distance from the plant) were detected where a group of microorganisms was present in increased numbers which has qualified the air as polluted. Biological aerosols from the activated sludge tanks were not generated in considerable amounts, which was confirmed by the absence or small number of faecal bacteria (coliforms, enterococci), absence of mannitol-fermenting straphylococci and typical water-sewage bacteria of the Pseudomonas fluorescens. The main sources of microbiological pollution were the grit removal chamber and the secondary settlers.

8

The effectiveness of nutrients removal in activated sludge in anaerobic-aerobic conditions

86%

Klimiuk E., Kulikowska D., Filipkowska U., Podgorniak J.

Polish Journal of Natural Sciences

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2002

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tom 12

9

Filamentous microorganisms occurring in foam of biological wastewater treatment plants and possibilities of their identification

86%

Kalisz L., Kazmierczuk M.

Archiwum Ochrony Środowiska

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2006

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tom 32

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nr 4

10

The influence of selected environmental toxins on the speed of decomposition of organic compounds in processes of oxygen biodegradation

86%

Skoczko I., Ignatowicz K.

Polish Journal of Environmental Studies

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2004

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tom 13

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nr 2

Nowadays, when pesticides are commonly available and used in an uncontrolled way, the danger of their infiltration into water and to sewage is very serious. Therefore, it is important to check the influence of chosen environmental toxins on sewage biodegradation effects and on the speed of decomposition of organic compounds. This paper presents the results of research into the changes of reaction rate constants in Eckefelder’s and Grau’s equations.

11

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

86%

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

Acta Protozoologica

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2001

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tom 40

|

nr 3

12

Effects of copper on ciliate communities from activated sludge plants

86%

Gracia M. P., Salvado H., Rius M., Amigo J. M.

Acta Protozoologica

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1994

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tom 33

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nr 4

13

Studies on the effect of inoculation of activated sludge with bacteria actively degrading hydrocarbons on the biodegradation of petroleum products

86%

Bieszkiewicz E., Boszczyk-Maleszak H., Wlodarczyk A., Horoch M.

Acta Microbiologica Polonica

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2002

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tom 51

|

nr 3

14

The sludge biotic index for the evaluation of the activated-sludge plant performance: the allocation of the ciliate Acineria uncinata to its correct functional group

86%

Madoni P.

Acta Protozoologica

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1996

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tom 35

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nr 3

15

Effectiveness of organics and nitrogen removal from municipal landfill leachate in single- and two-stage SBR system

86%

Klimiuk E., Kulikowska D.

Polish Journal of Environmental Studies

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2004

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tom 13

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nr 5

The efficiency of organics and nitrogen removal from municipal landfill leachate in activated sludge operated as single and two-stage SBR were investigated. Leachate from mature landfills are characterized by high N/COD ratio (> 0.5). In single activated sludge system at the hydraulic retention time (HRT) 3d and at methanol dosage 8 mg COD/mg NNO3 complete ammonium nitrogen removal was obtained. Ammonium concentration in the effluent was 0.15 mg NNH4/dm3 and nitrate - 23.5 mg NNO3/dm3 . At the hydraulic retention time 2d, nitrate nitrogen concentration in the effluent decreased to 2.79 mg NNO3/dm3. The concentration of ammonium nitrogen was 0.35 mg NNH4/dm3. However, a sporadically high concentration of ammonium appears. In a two-stage SBR system, HRT 2d was sufficient to achieve complete nitrification. In the effluent ammonium and nitrate concentrations were 0.08 mgNNH4/dm3 and 320 mgNNO3/dm3, respectively. In the anoxic reactor at HRT 1d and methanol dosage 3.6 mg COD/mg NNO3 complete denitrification was obtained. Raw leachate contained specific hazardous organics, among others BTEX (175.8 µg/dm3), chloroorganics (55.7 µg/dm3), chlorobenzenes (0.75 µg/dm3) and PAHs (1.97 µg/dm3). In the effluent from single and two-stage SBR systems chloroorganics and chlorobenzenes were not detected. BTEX and PAH concentrations in the effluent from two-stage system were adequately 2-fold and 2.1-fold lower in comparison to a single one. Besides, the effluent from two-stage SBR systems did not contain benzo(b)fluoranthene, benzo(k)fluoranthene, benzo(a)pyrene and indeno(1,2,3-cd)pyrene.

16

The effect of wastewater retention time in a Phoredox system on microfauna composition in activated sludge

86%

Hul M.

Acta Hydrobiologica

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1996

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tom 38

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nr 1-2

Laboratory experiments were carried out in 4 series differing as to waste- water retention time in anaerobic (t1), anoxic (t2), and aerobic (t3) chambers, and in a whole Phoredox system (t). Conditions for satisfactory development of the microfauna communities were ensured by the proportion t1: t2: t3 = 1.8 : 2.8 : 6.0 (h). This proportion was also characterised by the highest reduction of organic substances and nutrients. When t3 increased to 10.7 h, starvation symptoms appeared, whereas an increase of t1 to 4 h resulted in an oxygen deficiency in the microbiocoenosis. Reduction of t from 11.8 to 6.3 h increased the rate of microfauna washing out from the system.

17

The influence of soluble microbial products on microbial community composition: hypothesis of microbial community succession

86%

Chipasa K. B., Medrzycka K.

Polish Journal of Microbiology

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2008

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tom 57

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nr 1

Soluble microbial products (SMP) are organic compounds produced by activated sludge microorganisms as they degrade substrates. They include by-products of microbial activity, death and lysis. The available literature does not reveal how SMP influence microbial community composition. In this regard, we microscopically studied changes in composition of microbial communities, especially protozoa and metazoa, under the influence of increased as well as reduced levels of SMP. The presence of SMP at high level significantly caused changes in microbial community composition. Microbial species shifted from attached ciliates (12-175 μm) to free-swimming and crawling ciliates (35-330 μm) and then invertebrates, which included rotifers (0.2-1 mm) and nematodes (1-50 mm). The shift of small-size microorganisms to large ones was observed as one of the most significant influences of SMP. Attached ciliates reappeared when we removed the SMP that had accumulated in the bioreactors - we have called this as the resurrection phenomenon of microorganisms. Such rapid changes in microbial community composition were not observed in the experiment with low concentration of SMP. Overall, the results suggest that accumulation of SMP is one of the intrinsic regulatory mechanisms that control viability and dormancy of microbial communities in activated sludge.

18

Removal of organics and nitrogen from municipal landfill leachate in two-stage SBR reactors

86%

Kulikowska D., Klimiuk E.

Polish Journal of Environmental Studies

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2004

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tom 13

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nr 4

The aim of this study was to investigate efficiency of ammonium nitrogen removal from municipal landfill leachate in activated sludge in two-stage SBR reactors. Treated leachate contains low concentrations of organic substances measured as chemical oxygen demand (COD) - 757 mg O2/dm3 and high concentrations of ammonium - 362 mgNNH4/dm3. Nitrification was studied in two parallel, aerated SBR reactors with two different hydraulic retention times (HRT), 3 and 2 days, respectively. We have found that 2 days HRT was sufficient to achieve complete nitrification. In the effluent ammonium, nitrite and nitrate nitrogen concentrations were 0.08 mgN NH4/dm3, 0.04 mgN NO2/dm3 and 320 mgN NO3 /dm3, respectively. The ammonium nitrogen removal rate was 20.2 mgN NH4 /dm3.h. The effluent from aerobic reactors (HRT 2 days) was fed to the anoxic SBR reactors. An external carbon source (methanol) was added to promote denitrification. In the anoxic reactor, at a methanol dosage 3.6 mg COD/mg N NO3 and HRT of 1 day complete denitrification was achieve with nitrate nitrogen residual concentrations of 0.9 mgNNO3/dm3. The maximum denitrification rate was 48.4 mgN NOx/dm3.h. The highest values of the yield methanol coefficient Y m/N-NOx were determined for dosages 3.6 mg COD/mg NNO3 and 5.4 mg COD/mg NNO3, the lowest for 1.8 mg COD/mg NNO3.

19

Settling properties of activated sludge from a sequencing batch reactor [SBR]

86%

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

Polish Journal of Environmental Studies

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2001

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tom 10

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nr 1

The purpose of this work was to examine the settling properties of activated sludge from a sequencing batch reactor (SBR). The experiments were carried out in a bench-scale reactor, fed with wastewater from the University of Olsztyn treatment plant. Concentrations of the examined activated sludge varied between 2.5 and 6.0 kg SS m-3. Laboratory analyses of the sludge comprised: sludge concentration, settleability, sedimentation velocity and sludge volume index (SVI). The study revealed very good settling properties of the sludge. Low SVI (30 - 60 ml g-1 SS) was responsible for an intensive and quick sedimentation which shortened the settle phase to less than one hour. Moreover, low SVI prevented the sludge from bulking. High dissolved oxygen concentrations in the aeration tank during the react phase resulted in little sludge biomass growth, which is very important from the viewpoint of sludge disposal at a wastewater treatment plant.

20

Assessment of readily biodegradable organic matter in Vilnius municipality's wastewater: a case study

72%

Dauknys R., Matuzevicius A., Nemanyte J., Valentukeviciene M.

Annals of Warsaw Agricultural University. Land Reclamation

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2005

|

tom 36

Ograniczanie wyników

Treatment of liquid manure with activated sludge by adding municipal waste waters

Simultaneous application of Fenton's reaction and activated sludge method in sequencing batch reactor [SBR]

Toxic effect of chemical disinfection of wastewater on freshwater ciliates

Efficiency of removal of heavy metals from municipal landfill leachate

Rheological measurements of disintegrated activated sludge

Predvaritel'naja ochistka stochnykh vod s pomoshh'ju probioticheskikh sredstv

Municipal wastewater treatment plant with activated sludge tanks aerated by CELPOX devices as a source of microbiological pollution of the atmosphere