Removal of COD and decolorizing from landfill leachate by Fenton’s reagent advanced oxidation

Chen, Yunnen; Liu, Chunhua; Nie, Jun; Wu, Su-ying; Wang, Dongshuang

doi:10.1007/s10098-013-0627-1

Cited by 29 publications

(7 citation statements)

References 15 publications

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“…It was inferred that maximum dye removal (8.8 mg/L) was achieved with 3 cm bed height and 1.8 mL min -1 flow rate using 70 mg/L of initial dye concentration. In another work (Gunasekaran and Kanmani 2014;Chen et al 2014), it has been found that gas chlorination in decolourization/ degradation of textile dyeing wastewater was optimized and process kinetics of the chlorination had been studied and standardized. The percentage of colour removal and COD degradation were in the range of 89-95 %.…”

Section: Introductionmentioning

confidence: 98%

Degradation of azo dyes by laccase: biological method to reduce pollution load in dye wastewater

Kanagaraj

Senthilvelan

Panda

2014

Clean Techn Environ Policy

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Laccases are the oldest with low substrate specificity enzymes used for degradation of various compounds, especially, dyes. In the present investigation, the cell-free extract of laccase enzyme is applied to degrade azo dyes used in leather processing. The enzyme degrades the azo dyes rapidly at optimum growth conditions of pH 7.0, temperature 37°C and incubation duration of 72 h. Better production of the enzyme was achieved with dextrose, yeast extract, acetone, copper sulphate and orange peel. The molecular weight of laccase was found to be 63 kDa. The percentage of degradation is found to be 96.4 % for CI Acid black 210 and 92.2 % for the CI Acid black 234. Ultraviolet-visible spectral analysis indicates the presence of peaks in the visible region confirming the complete degradation of the dye sample. Fourier transforminfrared spectroscopy analysis shows the transformation of N=N into either N 2 or NH 3 and then into biomass. The mass spectra analysis shows conversion of azo dye to final product through various intermediates with their respective molecular weights. Chemical oxygen demand (COD) and biochemical oxygen demand (BOD) analysis reveal the reduction of pollution load more than 92 % in the experimental process while maintaining BOD/COD ratio to about 30 %.

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Section: Introductionmentioning

confidence: 98%

Degradation of azo dyes by laccase: biological method to reduce pollution load in dye wastewater

Kanagaraj

Senthilvelan

Panda

2014

Clean Techn Environ Policy

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“…PAOs are vulnerable to hazardous substances and prone to the process inhibition because of the location of the EBPR process and complex composition of sewage containing potential inhibitors. There are several substances in wastewater which inhibit biological phosphorus removal processpharmaceuticals (doxycycline, tetracycline, diclofenac), heavy metals (copper, tin, silver, chromium), salts, H 2 S and nanomaterials [5][6][7][8][9][10][11][12].…”

Section: Introductionmentioning

confidence: 99%

Assessment of enhanced biological phosphorus removal process inhibition

et al. 2020

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Wastewater in industrial regions frequently contains substances which are potentially inhibitory to activated sludge treatment processes. Enhanced biological phosphorus removal (EBPR) is vulnerable to process inhibition mostly because of the location at the beginning of the treatment process and complex characteristics of influent. Much knowledge has been developed on the EBPR process; nonetheless, methods used for estimation of the process inhibition vary largely. There is no easily applicable and reliable method available for rapid determination of inhibition of the EBPR process. In this study, a method for evaluation of inhibition on the EBPR process was developed and controlled. In contrast with previous research, a fresh non-acclimated inoculum was used to enhance the possibility to predict the impact for wastewater treatment plant. The efficiency of the process was evaluated based on the values of orthophosphate release and uptake, synthesis and consumption of polyhydroxyalkanoates. 3,5-dichlorophenol (3,5-DCP) was used as a model inhibitory compound. It was found that the EBPR inhibition tests using a non-acclimated sludge need wastewater as the organic carbon source. Furthermore, the length of aerobic period substantially influenced the inhibition test resultsachieved maximum inhibitory concentration (IC 50) values were 2.4 times higher when aerobic phase was 6 h instead of 1.5 h. Consequently, extended aeration period was suggested to diminish the inhibition effect. Finally, the impact of the 3,5-DCP on different activated sludge treatment process using respective standard methods was tested and compared. It was found that EBPR process was similarly to the nitrification a sensitive activated sludge process.

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“…Fenton process is one of the most popular processes. It is widely applied AOP, due to its effectiveness to target a wide variety of pollutants (Lucas et al 2007;Burbano et al 2008;Chen et al 2014). During the Fenton process, the hydroxyl radicals are produced.…”

Section: Introductionmentioning

confidence: 99%

Enzymatic bioleaching of metals from printed circuit board

Jadhav

Hocheng

2014

Clean Techn Environ Policy

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Enzymes are powerful tool that help to maintain an unpolluted environment through their use in waste management. Enzymatic bioremediation is potentially a rapid method for removal of pollutants. Therefore, the present study has been carried out to investigate the possibility of bioleaching of metals from printed circuit board (PCB) powder by enzymatic bio-Fenton process. To do this glucose oxidase enzyme was used for in situ production of hydrogen peroxide (H 2 O 2 ). The H 2 O 2 was further used in Fenton's reaction for conversion of Fe(II) into Fe(III). Effects of various parameters such as incubation time, temperature, pH, and shaking speed on conversion of Fe(II) into Fe(III) were assessed. This enzymatic bio-Fenton process was further applied for bioleaching of metals. The results showed that metal recovery increased with an increase in initial Fe(II) concentration. Maximum recovery of metals was achieved at 250 mM initial Fe(II) concentration. The metal recovery decreased with an increase in concentration of PCB powder. The present research put forth a novel method for bioleaching of metals.

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Removal of COD and decolorizing from landfill leachate by Fenton’s reagent advanced oxidation

Cited by 29 publications

References 15 publications

Degradation of azo dyes by laccase: biological method to reduce pollution load in dye wastewater

Degradation of azo dyes by laccase: biological method to reduce pollution load in dye wastewater

Assessment of enhanced biological phosphorus removal process inhibition

Enzymatic bioleaching of metals from printed circuit board

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