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1
Content available remote Nowoczesne metody usuwania barwników syntetycznych ze ścieków przemysłowych
Deska Małgorzata, Zawadzki Piotr
Przemysł Chemiczny
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2021
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T. 100, nr 7
664--667
PL
Konieczność spełniania coraz bardziej restrykcyjnych wymogów dotyczących parametrów ścieków przemysłowych odprowadzanych do środowiska sprawia, że badacze na całym świecie skupiają się na poszukiwaniu nowych, ulepszonych metod usuwania barwnych zanieczyszczeń. W pracy uwagę skupiono na zastosowaniu zaawansowanych procesów utleniania (AOPs) oraz wykorzystaniu immobilizowanych enzymów jako obiecujących technologii usuwania zanieczyszczeń barwnych ze ścieków przemysłowych, spełniających zasady „zielonej chemii”.
EN
A review, with 52 refs., of phys.-chem. and biological methods of removing synthetic dyes from wastewater. The advanced oxidn. processes (AOPs) and using of immobilized enzymes in decolorization processes were taken into consideration.
2
Content available Phytoremediation Efficiency of Water Hyacinth for Batik Textile Effluent Treatment
Safauldeen Suhair Hussein, Abu Hasan Hassimi, Abdullah Siti Rozaimah Sheikh
Journal of Ecological Engineering
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2019
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Vol. 20, nr 9
177--187
EN
The present study focused on the phytoremediation efficiency of water hyacinth for the batik effluent treatment. Three operating factors were investigated such as retention times (0 to 28 days), batik effluent strength (20, 30 and 60%), and number of water hyacinth clumps (8, 10 and 12 clumps). The water hyacinth efficiencies was monitored through the measurement of dry weight, color, chemical oxygen demand (COD), total suspended solid (TSS), and pH. The highest efficiency of color and COD in the batik effluent treatment were achieved at day 7 with 83% (61 mg/L) and 89% (147 ADMI) removals, respectively. Both wastewater parameters were removed to below the Standard A for COD and Standard B for color. Meanwhile for TSS, the removal decreased as the batik effluent strength increased, where the highest removal (92%) was achieved at day 28 with 8 number of plant clumps. The pH was observed in range of 6 to 7. The results indicated that water hyacinth would be the best option for the low cost batik effluent treatment.
3
Content available Color Removal from Groundwater by Coagulation and Oxidation Processes
Leszczyński Jacek
Journal of Ecological Engineering
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2019
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Vol. 20, nr 9
138--144
EN
The paper concerns the experimental research related to the removal of color and permanganate index (CODMn) in the presence of iron and manganese from the underground water by means of coagulation and ozonation. The tests were carried out on a laboratory and technical scale in the real underground water treatment system. Ozone, as a strong oxidizing agent, was used to reduce the color intensity and to convert the iron Fe2+ and manganese ions Mn2+ to Fe(OH) 3 and MnO2, respectively. In order to optimally remove the color to a value below 15 mg/L, the ozone dose of 3 mg/L was sufficient, which also ensured the proper removal of iron and manganese, by 94% and 83%, respectively. However, ozonation conducted under these conditions, did not provide sufficient removal of organic compounds expressed as CODMn below the assumed value of 3 mg/L. The effect of aluminum sulfate and polyaluminum chloride (PAC) was also studied, as a result of which it was found that polyaluminum chloride proved to be more effective reagent. Under the technical conditions of water purification at a dose of 16 mg/L coagulant, the efficiency of color removal was 65.2% and CODMn – 50.8%, which ensured that the values of the tested indicators in the purified water were maintained below the permissible level.
4
Content available Azo dye wastewater treatment in a novel process of biofilm coupled with electrolysis
Zou Haiming, Chu Lin, Wang Yang
Archives of Environmental Protection
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2019
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Vol. 45, no. 3
38--43
EN
Azo dye wastewater treatment is urgent necessary nowadays. Electrochemical technologies commonly enable more efficient degradation of recalcitrant organic contaminants than biological methods, but those rely greatly on the energy consumption. A novel process of biofilm coupled with electrolysis, i.e., bioelectrochemical system (BES), for methyl orange (MO) dye wastewater treatment was proposed and optimization of main influence factors was performed in this study. The results showed that BES had a positive effect on enhancement of color removal of MO wastewater and 81.9% of color removal efficiency was achieved at the optimum process parameters: applied voltage of 2.0 V, initial MO concentration of 20 mg/L, glucose loads of 0.5 g/L and pH of 8.0 when the hydraulic retention time (HRT) was maintained at 3 d, displaying an excellent color removal performance. Importantly, a wide range of effective pH, ranging from 6 to 9, was found, thus greatly favoring the practical application of BES described here. The absence of a peak at 463 nm showed that the azo bond of MO was almost completely cleaved after degradation in BES. From these results, the proposed method of biodegradation combined with electrochemical technique can be an effective technology for dye wastewater treatment and may hopefully be also applied for treatment of other recalcitrant compounds in water and wastewater
5
Content available Decolourization of tartrazine from aqueous solutions by coupling electrocoagulation with ZnO photocatalyst
Modirshahla N., Abdoli M., Behnajady M. A., Vahid B.
Environment Protection Engineering
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2013
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Vol. 39, nr 1
59--73
EN
Decolourization of tartrazine (C.I. Acid Yellow 23, AY23) in aqueous solutions has been investigated by coupling electrocoagulation and ZnO photocatalyst methods and also by a comparison between ZnO, UV, EC, UV/ZnO, UV/EC, and EC/UV/ZnO systems in the removal of AY23 as a model contaminant. Results indicated that the decolourization efficiency was in order of EC/UV/ZnO > UV/EC > EC > UV/ZnO > ZnO > UV. Combining EC with UV/ZnO can trigger the Fenton or Fenton-like reaction, which accelerates the rate of decolourization. Desired operating conditions for decolourization of 40 mg·dm-3 AY23 solution in EC/UV/ZnO process were [ZnO] 0=650 mg·dm-3, [NaCl] = 800 mg·dm-3, light intensity = 31/2 W·m-2, current density = 120 A·m-2, electrodes distance = 15 mm, pH = 6.29, stirring rate = 900 rpm and electrodes of steel 304/A1, which yielded 99.70% colour removal in 5 min of treatment time.
6
Content available remote PH effect on decolorization of raw textile wastewater polluted with reactive dyes by advanced oxidation with U/VH2O2
Racyte J., Rimeika M., Bruning H.
Environment Protection Engineering
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2009
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Vol. 35, nr 3
167-178
EN
The effectiveness of the advanced oxidation process (UV/H2O2) in decolorizing real textile wastewater polluted with commercial reactive dyes - Reactive Yellow 84 and Reactive Red 141 - was investigated. All the experiments were performed in a lab-scale reactor with the original high pH of the wastewater. The dyeing wastewater was decolorized in 5 hours. After its acidification to pH 3 the decolorization process was more efficient. Full decolorization was then achieved in 2 hours and the decrease in COD exceeded 70%. The reaction rate constants obtained were as follows: at pH 11.4, 0.0065 min(-1); at pH 7, 0.0044 min(-1), and at pH 3, 0.019 min(-1), which testified to pH importance for UV/H2O2 oxidation process.
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