Wyniki wyszukiwania - Biblioteka Nauki

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Influence of ultrasound field on landfill leachate treatment by means of anaerobic process

100%

Bohdziewicz J. , Kwarciak A. , Neczaj E.

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tom Vol. 31, nr 3-4

61-72

EN

The aim of the paper was to determine the influence of ultrasonic field on biodegradation of refractory compounds in leachate and on enhancement of treatment efficiency during anaerobic digestion process. In the first step of this investigation, the optimal ultrasound parameters, i.e. amplitude and ultrasonication time, were estimated. There-after the anaerobic treatment efficiency of the leachate subjected to ultrasonication and non-conditioned was assessed. It was found that in the case of leachate ultrasoni-cation for 300 s and at the amplitude of 14 mm, the COD removal efficiency was by 7% higher compared with that in fermentation of non-conditioned wastewater. An increase in a biogas production was also observed, while on the 8th day of the process a specific methane yield was by 22% higher compared with that of non-conditioned leachate.

2

Anaerobic treatment of industrial wastewater by UASB reactor integrated with chemical oxidation processes; an overview

75%

Yasar A. , Tabinda A. B.

Polish Journal of Environmental Studies

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2010

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tom 19

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nr 5

EN

In order to upgrade the quality of anaerobically treated effluent to a level recommended for irrigation, integration of a UASB reactor with UV and AOPs (advanced oxidation processes) (Ozone, H2O2/UV, Fenton, and photo-Fenton) could be a better option for almost complete colour, COD removal, and disinfection of pathogens. High efficiency of the UASB can be maintained by proper process conditions, including temperature, sludge age, pH, hydraulic retention time, and gas-liquid-solid separator (GLSS) design. A fraction of the COD and colour is usually non-biodegradable and renders difficulty for anaerobic digestion. AOPs degrade the organic molecules and converting completely the organic compounds to non-toxic components such as CO2 and/or water. As far as disinfection is concerned, advanced oxidation processes are proved to be extremely effective in killing pathogens (total coliform, fecal coliform, fecal streptococci, salmonella, and E. coli) due to their strong oxidative characters. Although AOPs effectively accomplish pathogen elimination, re-growth of pathogenic microorganisms can take place in the treated effluent. Re-growth potential of pathogens provides helpful information about the quality of the treated water, which is very important in all possible reuse options. The combined application of AOPs with anaerobic treatment minimizes the chances of regrowth due to irreparable damage to nucleic acid. This review paper focuses primarily on the process conditions and treatment efficiency for UASB treatment systems, and to evaluate the advanced oxidation processes (AOPs) as an option for post treatment.

3

Beztlenowe oczyszczanie ścieków w zakładach celulozowo-papierniczych

63%

Buczak B. , Driessen W. , Habets L.

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tom R. 61, nr 9

543-546

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Zastosowanie fermentacji psychrofilowej do oczyszczania ścieków komunalnych

63%

Mrowiec B.

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tom Vol. 3 (23)

44--53

EN

Used in practice biological wastewater treatment systems under aerobic conditions are characterized by high energy consumption and a significant sewage sludge production. Anaerobic wastewater treatment differs from conventional aerobic treatment. The absence of oxygen leads to controlled conversion of complex organic pollutions, mainly to carbon dioxide and methane. Anaerobic treatment has favourable effects like removal of higher organic loading, low sludge production, high pathogen removal, biogas gas production and low energy consumption. Psychrophilic anaerobic treatment can be an attractive option to conventional anaerobic digestion for municipal sewage (and wastewaters with industrial effluents) that are discharged at moderate to low temperature. Most reactions in the biodegradation of organic matter require more energy to proceed at low temperatures than at a temperature optimum of 37ºC. However, same reactions, such hydrogenotrophic methane production, acetate formation from hydrogen and bicarbonate, require less energy. In this work, an upflow anaerobic filter for municipal sewage treatment was used. The investigations were carried out in laboratory scale. The sewage treatment process was operated in psychrophilic conditions in the temperature 15–19°C. The value of hydraulic retention time in anaerobic bioreactor was 48 h. A real municipal sewage was taken from the treatment plant, operated in a full scale. The COD values of raw sewage were between 380 and 895 mg O2/L. The sewage used was additionally polluted with ammonia nitrogen average 81 mg NH4+/L, phosphate – 27 mg PO43-/L as well as sulphates 69 mg SO42-/L. The investigations comprised of three series of different organic loading rates: series 1 – 0.19 kg COD/(m3·d), series 2 – 0.32 kg COD/(m3·d) and series 3 – 0.26 kg COD/(m3·d). Depending on values of sewage/organic loading rates 46–72% of COD were removal at psychrophilic conditions. The presence of ammonia nitrogen and sulphates did not have a negative impact on the process of organic matter degradation. Anaerobic treatment was effective in removing biodegradable organic compounds, but mineral compounds (NH4+, PO43-, S2-) remained in high concentrations. Therefore, these compounds require removing by an additional post-treatment step.

5

Zaawansowane instalacje oczyszczania ścieków z produkcji soków, napojów i koncentratów na przykładzie Tymbark S.A. i Tymbark Olsztynek

44%

Buczak B.

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tom 53

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nr 04