Wyniki wyszukiwania - BazTech

1

A novel process of dye wastewater treatment by linking advanced chemical oxidation with biological oxidation

Zou H., Ma W., Wang Y.

Archives of Environmental Protection

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2015

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Vol. 41, no. 4

33--39

EN

Dye wastewater is one of typically non-biodegradable industrial effluents. A new process linking Fenton’s oxidation with biological oxidation proposed in this study was investigated to degrade the organic substances from real dye wastewater. During the combination process, the Fenton’s oxidation process can reduce the organic load and enhance biodegradability of dye wastewater, which is followed by biological aerated filter (BAF) system to further remove organic substances in terms of discharge requirement. The results showed that 97.6% of chemical oxygen demand (COD) removal by the combination process was achieved at the optimum process parameters: pH of 3.5, H22

2

Studies of optimization of colored wastewater treatment by Fenton’s reagent (Part I)

Barbusiński K., Amalio-Kosel M., Pieczykolan B., Płonka I., Fajkis S.

Proceedings of ECOpole

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2013

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Vol. 7, No. 1

23--27

EN

The constant industry development results in the increase of number and diversity of substances deposited with wastewater. Moreover, requirements for wastewater utilization are constantly restricted, thus there is the need of treatment methods improvement. In recent studies significant attention is devoted to advanced oxidation processes (AOPs), in which highly reactive radicals able to treat concentrated, hardly degradable and toxic industrial wastewaters are generated. Colored wastewaters produced during industrial processes usually characterize with significant content of refractive organic compounds which additionally posses mutagenic and cancerogenic properties. Classical treatment methods of such wastewaters (e.g. sorption, coagulation) hardly ever guarantee efficient dyes degradation. Thus, the treatment of colored wastewater with the use of one of AOP ie Fenton reagent was performed. First, preliminary studies focused on the influence of H2O2 dose, initial pH value, reaction time and Fe2+/H2O2 weight ratio on treatment effect were performed. Obtained results will be further used for development of crucial studies plan in which Surface Response Method will be used. The study will allow to formulate mathematical models describing changes of wastewater decolorization effects as a function of investigated parameters. Thus, the optimization of the process will be possible.

PL

W wyniku ciągłego rozwoju przemysłu wzrasta ilość i różnorodność zanieczyszczeń odprowadzanych ze ściekami. Ponadto wymagania dotyczące unieszkodliwiania ścieków ulegają ciągłym zaostrzeniom, dlatego istnieje duża potrzeba doskonalenia metod oczyszczania. W ostatnich latach dużą uwagę poświęca się badaniom i wdrażaniu tzw. metod pogłębionego utleniania, które polegają na generowaniu wysoko reaktywnych rodników mających zdolność oczyszczania stężonych, trudno degradowanych i toksycznych ścieków przemysłowych. Ścieki barwne powstające w wyniku procesów produkcyjnych zazwyczaj charakteryzują się dużą zawartością trudno rozkładalnych związków organicznych, mających często charakter muta- i kancerogenny. Klasyczne metody oczyszczania takich ścieków (np. koagulacja, sorpcja) rzadko umożliwiają skuteczną degradację barwników, dlatego przeprowadzono oczyszczanie ścieków barwnych, wykorzystując jedną z metod pogłębionego utleniania odczynnik Fentona. W pierwszej kolejności przeprowadzono badania wstępne, mające na celu określenie wpływu wielkości dawki H2O2, początkowej wartości pH, czasu reakcji oraz wartości stosunku masowego Fe2+/H2O2 na efekty odbarwiania ścieków. Uzyskane w ten sposób wyniki były następnie podstawą do opracowania planu badań właściwych, prowadzonych przy użyciu tzw. metody powierzchni odpowiedzi. Na podstawie wyników tych badań opracowane zostaną modele matematyczne zmian efektów odbarwiania ścieków w funkcji badanych czynników, umożliwiające przeprowadzenie optymalizacji tego procesu.

3

The application of selected activated carbons to dye wastewater treatment

Picheta-Oleś A.

Structure and Environment

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2010

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Vol. 2. no. 3

52-58

EN

In the presented study I have undertaken the research concerning the efficiency of dye removal which is crystal violet (the dye used for fabric dying and production of printing paste) from water solution with the use of activated carbons. In the research I have used fresh commercial active carbons WDex and WG-12. These carbons differ in their porous structure parameters (S, V, iodine, methylene and detergent values) as well as chemical properties of the surface (surface acidity, ability to dechlorine). It has been found that having the initial dye concentration 20 mg/L in the presence of activated carbons, the process of solution decolourisation takes place. Sorption capacity of activated carbon WDex equals 35 mg/g and in case of WG-12 – 12 mg/g. The sorption process of examined activated carbons is better described by Langmuir isotherm.

4

Effects of pretreatment of dye wastewater using iron filings filtration and H2O2

Ruixia H., Peng L., Yuwen Z., Shuiyuan C.

Zeszyty Naukowe. Inżynieria Środowiska / Politechnika Opolska

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2003

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Vol. 291, z. 4

277-282

EN

China is the largest country in the world in production and exportation of dye. The wastewater from dye producing process is a serious source of pollution in natural water resources. Its ingredients are very complex and harmful to the environment. Most of the ingredients are man-made synthetic chemical materials that are very difficult to biodegrade, which makes bio-treatment methods inefficient. At present, there are no satisfactory methods for the treatment of the wastewater. This paper reports the result of pre-treating the dye wastewater by an Iron Filings Filter (IFF) + H2O2. Micro electrolysis action takes place with the IFF and produces Fe2+ ions, which form the Fenton oxidation reagent with added H2O2 in the influent. This can break and change the long-chains and link structures of the dye molecules or pollutants into biodegradable materials so that this wastewater may be further treated easily by biological methods. When only using the Iron Filings Filter (IFF), the BODs/COD value of the effluent increased by 0.2-0.3 more than that of the original wastewater at pH4 and hydro-remain time (HRT) 8 min. When 30%H2O2 was added to the influent at a rate of 8%o, the biodegradation of this wastewater was greatly improved so that bio-treatment is shown to be more efficient by using both IFF and H2O2.