COD Reduction of Anaerobically Digested Distillery Spentwash By Electro-Fenton Process

Combined Chemical-Biological Treatment of Effluents from Soil Remediation Processes by Surfactants Solutions Flushing In recent years combined chemical-biological wastewater treatment processes have received increasing interest. In the present study wastewater from soil remediation processes were treated by means of 1-step processes like Fenton, aerobic degradation and 2-steps combined method. The effluents resulting from soil remediation processes consist of high surfactant concentration solutions, mobilized oils and oil-in-water (o/w) emulsions. The effectiveness of wastewater treatment was evaluated by COD reduction and surfactant removal. The application of Fenton process alone showed around 80% of COD and surfactant removal, and in case of aerobic process only 60% of COD and 50% of surfactant removal was accomplished. However, the maximum COD reduction and surfactant removal from wastewater samples, above 90%, was obtained in aerobic degradation with Fenton process as pretreatment. Thus, the Fenton process could be effectively applied as a pretreatment step to improve the reduction of both COD and surfactant from wastewater resulting from soil remediation.

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COD Removal of Edible Oil Content in Wastewater by Advanced Oxidation Process

Environment and Natural Resources Research ◽

10.5539/enrr.v6n2p57 ◽

2016 ◽

Vol 6 (2) ◽

pp. 57 ◽

Cited By ~ 1

Author(s):

Aola Hussein Flamarz Tahir ◽

Nagam Obeid Kariem ◽

Shatha Abduljabbar Ibrahim

Keyword(s):

Advanced Oxidation Process ◽

Ph Value ◽

Advanced Oxidation ◽

Fenton Process ◽

Cod Reduction ◽

Chemical Reagents ◽

Batch System ◽

Oil Concentration ◽

Optimum Chemical ◽

Total Reaction Time

Different Advanced Oxidation Processes (Photo Fenton process, Fenton process and H2O2/UV) were studied in order to reduce COD from oily compounds aqueous solution using batch system. To get the optimum condition, different variables were studied for each of these processes; such as pH, time, concentration of H2O2, concentration of oil, concentration of FeSO4·7H2O and temperature as parameters. It was found that the optimal pH value for the three processes was 3 and the optimal temperature was 30oC for Photo-Fenton and UV/H2O2 system and 20oC for Fenton process. Photo-Fenton process gave a maximum COD reduction of 80.59 % (COD from 2684 to 521 mg/l), Fenton gave 53.22 % (COD from 2587-1130) and the combination of UV/H2O2 gave a COD reduction of 22.69 % (COD from 2450 to 1894). The percentage of removal found was after the total reaction time (180 min.). The optimum chemical reagents for Photo-Fenton, Fenton and UV/H2O2 were as the following H2O2 = 800 mg/l, 1500 mg/l and 2000 mg/l, Fe2SO4·7H2O = 60 mg/l, 100 mg/l.

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Removal of COD from Oil Recovery Industry Wastewater by the Advanced Oxidation Processes(AOP) Based on H2O2

Global NEST Journal ◽

10.30955/gnj.000479 ◽

2013 ◽

Vol 10 (1) ◽

pp. 31-38 ◽

Cited By ~ 1

Keyword(s):

Reaction Time ◽

Oil Recovery ◽

Oxygen Demand ◽

Cod Removal ◽

Fenton Process ◽

Oil And Grease ◽

Cod Reduction ◽

Oxidation Processes ◽

High Pollution ◽

Industry Wastewater

The combinations of H2O2/Fe+2, UV/H2O2/Fe+2 and UV/H2O2 process were investigated on treatment of oil recovery industry wastewater. Treatment of oil recovery industry wastewater, a typical high pollution strength industrial wastewater (chemical oxygen deman (COD): 21000 mg l-1, biological oxygen demand (BOD): 8000 mg l-1, oil and grease:1140 mg l-1, total dissolved solids (TDS): 37000 mg l-1, total suspended solids: 2580 mg l-1), was carried out by batch oxidation processes. The optimal mass ratio for H2O2/Fe+2 yielding the highest COD removal was found to be 8.658 corresponding to 200.52 g 1-1 H2O2 and 23.16 g l-1 Fe+2 concentrations for 60 minutes reaction time. Fenton process gave a maximum COD reduction of 86% (from 21000 to 2980 mg l-1) and the combination of UV/H2O2 gave a COD reduction of 39% (from 21000 to 12730). The percentage of removal, after the total reaction time (3.5h), H2O2: 8.4 g l-1 and Fe+2: 0.05g l-1, in the photo Fenton process, corresponded to 81 % of the total initial COD (4200 mg l-1). The oxidative ability of the UV/Fe+2/H2O2 process (81%) was greater than that of the UV/H2O2 process (55%) for 80% diluted wastewater. COD removal efficiency for UV/H2O2 process (COD/H2O2=1/2 (w/w)) was 90%, 55%, and 39 when initial COD was 1050, 4200, and 21000 mg l-1, respectively, whereas COD removal was 943, 2320, and 8270 mg l-1, respectively.

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