Temat: aluminum electrodes - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Reduction of Total Chromium Levels from Raw Tannery Wastewater via Electrocoagulation using Response Surface Methodology
Autorzy:: Aguilar-Ascón, Edwar
Marrufo-Saldaña, Liliana
Neyra-Ascón, Walter
Powiązania:: https://bibliotekanauki.pl/articles/124384.pdf
Data publikacji:: 2019
Wydawca:: Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:: chromium
electrocoagulation
tannery wastewater
aluminum electrodes
response surface
Opis:: This study focused on reducing total chromium levels in raw wastewater from the leather tanning industry via electrocoagulation to comply with maximum permissible limits (MPL) and to determine the effects of main process parameters. An electrocoagulation reactor was built using aluminum electrodes as an anode and cathode. Then, the response surface methodology was applied using a 3^k factorial design considering three factors, namely current intensity, treatment time, and pH. The total chromium removal percentage was considered as a response variable. 99% of the total chromium found in wastewater could be removed after 14-min treatment at 2-A current intensity and pH 5.5. Similar amount of chromium was removed at pH of 8.5 and 7. Statistical analysis performed at a confidence level of p < 0.05 revealed that all three factors influenced electrocoagulation. Total chromium could be efficiently removed from raw wastewater at a current intensity of 2.9 A, a pH of 8.4, and a treatment time of 21 min, suggesting that electrocoagulation using aluminum electrodes is an efficient method for total chromium removal. Thus, this process must be considered as a solution to the problems caused by the leather tanning industry and for better compliance with the MPL established in the Peruvian environmental standards.
Źródło:: Journal of Ecological Engineering; 2019, 20, 11; 217-224
2299-8993
Pojawia się w:: Journal of Ecological Engineering
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Improving the Quality of Anaerobically-Pretreated Palm Oil Mill Effluent Using Electrocoagulation
Autorzy:: Sailah, Illah
Reyhanto, Fathan
Puspaningrum, Tyara
Romli, Muhammad
Suprihatin, Suprihatin
Indrasti, Nastiti Siswi
Powiązania:: https://bibliotekanauki.pl/articles/1839577.pdf
Data publikacji:: 2021
Wydawca:: Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:: aluminum electrodes
electrocoagulation
empirical model
palm oil mill effluent
POME
pollutant removal
Opis:: The palm oil extraction process generates large amounts of effluents with very high concentrations of pollutants, even though they are subjected to anaerobic pretreatment. Further treatment is needed in order to ensure that the effluent is safe for disposal or reuse. This work was conducted to evaluate the performance of an electrocoagulation process in removing pollutants from the anaerobically-pretreated palm oil mill effluent. A 1000 ml beaker glass equipped with a magnetic stirrer was used as an electrocoagulation reactor with four plates of aluminum electrode @ 12×2 cm and an effective area of 0.1 m2 arranged in a bipolar configuration. The experiments run in a batch mode were carried out at various voltage levels and contact times, namely 10, 15, and 20 V for 15, 30, 45 and 60 min. The level of pollutant removal and electrical energy consumption were determined. The electrocoagulation process at 15 V for 30 min produced the highest level of pollutant removal for TSS, turbidity, color, COD, and BOD5, i.e. 90%, 86%, 93%, 87%, and 97%, respectively. The estimated operating costs for these process conditions are 1.48 USD/m3. A second order empirical model was developed to describe the TSS removal in the POME electrocoagulation process. The electrocoagulation with aluminum electrodes can significantly reduce various types of pollutants of anaerobically-pretreated POME, such as TSS, turbidity, color, COD, and BOD5. The estimated cost of EC operation is cheaper than the chemical coagulation process.
Źródło:: Journal of Ecological Engineering; 2021, 22, 1; 112-124
2299-8993
Pojawia się w:: Journal of Ecological Engineering
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Wpływ procesu elektrochemicznego na stężenie azotu ogólnego i ortofosforanów w odpływie z reaktora z unieruchomioną błoną biologiczną
Effect of Electrochemical Process on the Concentration of Total Nitrogen and Orthophosphates in the Outflow from the Reactor with Immobilized Biofilm
Autorzy:: Kłodowska, I.
Rodziewicz, J.
Janczukowicz, W.
Filipkowska, U.
Powiązania:: https://bibliotekanauki.pl/articles/1819098.pdf
Data publikacji:: 2013
Wydawca:: Politechnika Koszalińska. Wydawnictwo Uczelniane
Tematy:: proces elektrochemiczny
błona biologiczna
wastewater
aluminum electrodes
contaminated water
drinking water
electrocoagulation
removal
nitrate
denitrification
technologies
wastewaters
Opis:: Municipal and industrial wastewaters discharged to water reservoirs should be characterized by a low load of nutrients. Nitrogen and phosphorus are responsible for eutrophication, is therefore necessary to find the effective solutions for their removal. The experiment has been carried in order to determine the impact of the electric current density on the course of simultaneous electrocoagulation and hydrogenotrophic denitrification in the rotating electro-biological contactor (REBC).The study was conducted in the laboratory scale, parallely in three anaerobic reactors, in conditions of the flow electric current. In the REBC unit, rotating disks made of stainless steel with immobilized biofilm were the cathode. Hydrogen donor produced on the surface of cathode, in water electrolysis process, was used by denitrifying bacteria for nitrates reduction. As the anode an aluminum electrode mounted in the reactors was used. As a result of the anode electrolytic dissolution releasing Al3+ ions combined with the hydroxyl ions emitted on the cathode, formed metal hydroxides, which functioned as a coagulant in the binding of phosphate ions. In crude wastewaters inflowing to the bioreactors the concentration of orthophosphates was 8.1 mgPO4×dm-3 and total nitrogen 81.36 mg Nog×dm-3 and the concentration of organic compounds was equal 40.52 mg O2×dm-3 . The study showed that regardless the operating parameter of the electrolysis process, effluent concentration of orthophosphate below 1 mg PO4×dm-3 was obtained. However, the lowest concentration were observed at a density 0.05 mA×cm-2 . The efficiency of 97.27% corresponded to the phosphate concentration equal 0.22 mg PO4×dm-3. The increase of electric current density resulted in a higher concentration of orthophosphate in the effluent from the reactors, because of more intensive dissolution of aluminum hydroxide with the increase of wastewater alkalinity and a limited amount of secreted Al3+ ions, as a result of aluminum oxide accumulation on the anode surface. In the same time, electrolytically-aided denitrification process affected the reducing concentration of total nitrogen in the wastewaters with the increase of electric current density, as a result of intensive use a hydrogen donor by denitrifying bacteria. The lowest concentration of total nitrogen in the treated wastewaters was achieved at the highest current density 0.1 mA cm-2 – 16.15 mgNog dm-3 , which corresponded to 80.15% effectiveness. The research has shown that bio-electrochemical reactor may be an alternative solution for reactors with suspended biomass designed for nutrients removal.
Źródło:: Rocznik Ochrona Środowiska; 2013, Tom 15, cz. 2; 1952-1964
1506-218X
Pojawia się w:: Rocznik Ochrona Środowiska
Dostawca treści:: Biblioteka Nauki

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