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    Wyświetlanie 1-4 z 4
    Tytuł:
    The Use of Biofiltration Process to Remove Organic Matter From Groundwater
    Autorzy:
    Papciak, D.
    Kaleta, J.
    Puszkarewicz, A.
    Tchórzewska-Cieślak, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/952351.pdf
    Data publikacji:
    2016
    Wydawca:
    Polskie Towarzystwo Inżynierii Ekologicznej
    Tematy:
    groundwater
    biofiltration process
    total organic carbon (TOC)
    water treatment
    Opis:
    The article describes the research on the removal of organic matter from natural underground water using biofiltration process. The study was carried out in semi-technical scale on a model filter composed of activated carbon WD-extra. The development of biological activity in a biosorption bed, as well as observations on the relationship between the processes of sorption and biodegradation was evaluated based on the Eberhardt, Madsen, Sontheimer (EMS) test. Leading operation control parameters of biologically active carbon filter BAF included: change of TOC content, dissolved oxygen and permanganate index. To evaluate the colonization of granular carbon determination of ATP value was used. The presence of the biofilm was found by observation using light and scanning microscopes. The organic compounds in the water taken were adsorbed 100% and 70% biodegradable. The combination of sorption process with biodegradation until depletion of activated carbon adsorption capacity allowed in the initial phase of coalbed work for the removal of organic matter in approx. 100%. Formation of biofilm at the right time allowed to extend the filtration cycle and helped lower the TOC by 70%, i.e. from 10 mg C/l to 3–4 mg C/l.
    Źródło:
    Journal of Ecological Engineering; 2016, 17, 3; 119-124
    2299-8993
    Pojawia się w:
    Journal of Ecological Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Nutrients Assessment of Tropical Soils Around a Mega Cement Factory in Southwest Nigeria
    Autorzy:
    Oludoye, O. O.
    Ogunyebi, L. A.
    Powiązania:
    https://bibliotekanauki.pl/articles/123225.pdf
    Data publikacji:
    2017
    Wydawca:
    Polskie Towarzystwo Inżynierii Ekologicznej
    Tematy:
    nutrient assessment
    cement dust
    total organic carbon (TOC)
    soil protein
    Opis:
    Cement production is renowned for particulate contamination of the environment because of high dust emissions and heavy metals that later deposited in soils, serving as a sink. This study investigated the effect of cement dust pollution on some selected soil nutrients (phosphorous, protein, carbon and nitrogen) of the soil surface around Lafarge cement factory, Sagamu, Ogun State, Nigeria. Fifteen (15) composite topsoil samples of the soil surface were randomly collected in the eastern, western, and southern axes of the factory while control samples were collected 15 km from the factory. The samples were taken from a depth of 0 to 15 cm and analyzed for chemical, physical and microbiological properties. Data were analyzed with ANOVA and Duncan Multiple Range Test. The results showed that Total Organic Nitrogen (TON), Total Organic Carbon (TOC) and Heavy Metals decreased with increasing distance from the cement factory while there was increase in the amount of Soil Protein and Soil Phosphorous. In conclusion, the inverse correlation between most of these heavy metals, the pH, and the activities of the soil nutrients are indicative that pollution caused by cement production exhibit a significant effect on soil nutrients and this may invariably affect the quality and condition of the soil of the area.
    Źródło:
    Journal of Ecological Engineering; 2017, 18, 2; 21-28
    2299-8993
    Pojawia się w:
    Journal of Ecological Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Experimental Study of Produced Water Treatment Using Activated Carbon with Aluminum Oxide Nanoparticles, Nanofiltration and Reverse Osmosis Membranes
    Autorzy:
    Hussein, Mudhaffar Yacoub
    Al-Naemi, Amer Naji Ahmed
    AlJaberi, Forat Yasir
    Powiązania:
    https://bibliotekanauki.pl/articles/24201776.pdf
    Data publikacji:
    2023
    Wydawca:
    Polskie Towarzystwo Inżynierii Ekologicznej
    Tematy:
    produced water
    wastewater treatment
    nanofiltration membrane
    reverse osmosis membrane
    TOC removal
    total organic compound
    TDS removal
    total dissolved solids
    reuse
    Opis:
    This work inspected the produced water discharged from the Amara oil field in (Misan-Iraq) to improve the quality of water before reuse and reinjection or disposal. The process of treatment included a pretreatment step using activated carbon and post-treatment using flat polymeric nanofiltration membrane (NF) (1.0 nm) and reverse osmosis membrane (RO) (0.3 nm), respectively. Therefore, activated carbon without aluminum oxide (Al2O3) nanoparticles and with (Al2O3) nanoparticles (20 nm) was used to examine the removal efficiency of the total organic compound (TOC). The height of the fixed bed of activated carbon and its diameter were 35 cm and 2.5 cm, respectively. The volumetric flow rates of the produced water flowing through the activated carbon column were taken as (25, 20, 15, 10 and 5)×10-4 m3/h respectively, at transmembrane pressure (TMP) of 1.0 bar, pH equals 6, and the temperature of 25 °C. The TOC removal efficiencies attained using activated carbon without Al2O3 nanoparticles were (52, 64, 77, 83 and 87%), respectively, and (65, 72.7, 83.4, 92.5 and 95.2%) with the use of Al2O3 nanoparticles, respectively. Produced water effluent from the activated carbon column was treated by flat NF and RO membranes to reduce the total dissolved solids (TDS). The cross-flow rates through NF and RO membranes were 0.1 and 0.25 m3/h, TMP (1–12 bar) and 60 bar, respectively. The removal efficiency of TDS was enhanced up to 40% and 99.67%, respectively. In addition, the TOC removal efficiency was 100% in the effluent of the RO membrane.
    Źródło:
    Journal of Ecological Engineering; 2023, 24, 5; 78--87
    2299-8993
    Pojawia się w:
    Journal of Ecological Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of Thermal and Alkaline Disintegration of Excess Sludge on Biodegradation
    Autorzy:
    Zawieja, Iwona
    Powiązania:
    https://bibliotekanauki.pl/articles/952398.pdf
    Data publikacji:
    2019
    Wydawca:
    Polskie Towarzystwo Inżynierii Ekologicznej
    Tematy:
    volatile fatty acids
    excess sludge
    thermal disintegration
    alkaline disintegration
    soluble chemical oxygen demand
    SCOD
    total organic carbon
    TOC
    VFAs
    methane fermentation
    Opis:
    Thermal methods of sludge disintegration can be divided into high temperature (over 100°C) and low temperature (below this temperature). They consist in the supply or removal of thermal energy, contributing to the changes in sludge structure and physicochemical properties. During the chemical disintegration of excess sludge with sodium hydroxide, there is an increase in the pH value, as well as changes in their structure. The OH- ions are highly toxic to the microorganisms living in the excess sludge and affect the decline of biological activity of most microorganisms. The aim of the conducted research was to prove the impact of the thermal and alkaline disintegration of excess sludge on the susceptibility of organic substances to biodegradation. The thermal disintegration of excess sludge was carried out in a shaking water bath, in which the sludge placed in laboratory flasks with an active volume of 0.5 L were heated for a specified period within the scope of the so-called low temperatures, i.e. 65–95 °C. The sludge was heated for a period of 0.5–12 h. The alkaline disintegration of the sludge was carried out with sodium hydroxide in the form of dust at ambient temperature, in sealed plastic bottles with an active volume of 5L, the contents of which were mixed manually every few hours. The regent doses in the range of 0.05–1.3 g NaOH/g VSS and disintegration time 12h were used. As a result of subjecting the excess sludge to disintegration by means of the selected methods, an increase in the concentration of organic substances in the dissolved form in the supernatant liquid was noted. On the basis of the increase in SCOD, TOC value and VFAs concentration, the most favorable modification conditions were determined. As a result of disintegration of the sludge and subsequent methane fermentation, the supporting effects of the applied modification methods were observed, in relation to the conventional methane fermentation of excess sludge.
    Źródło:
    Journal of Ecological Engineering; 2019, 20, 10; 172-182
    2299-8993
    Pojawia się w:
    Journal of Ecological Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-4 z 4

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