A precise experimental study of various affecting operational parameters in electrocoagulation–flotation process of high-load compost leachate in a batch reactor

2014 ◽  
Vol 70 (8) ◽  
pp. 1314-1321 ◽  
Author(s):  
T. Amani ◽  
K. Veysi ◽  
S. Elyasi ◽  
W. Dastyar
Keyword(s):  
Batch Reactor ◽  
Oxygen Demand ◽  
Total Suspended Solid ◽  
High Load ◽  
Interactive Effects ◽  
Operational Parameters ◽  
Flotation Process ◽  
Positive Effects ◽  
Compost Leachate ◽  
Maximum Removal

The present study treated compost leachate, a high load organic and inorganic wastewater, using a batch electrocoagulation–flotation (ECF) process. ECF is an effective, fast, reliable, feasible, and economic technique for wastewater treatment. The interactive effects of operational factors such as influent chemical oxygen demand (COD), voltage, electrolysis time (ET), and electrodes distance (ED) on the efficiency of COD and total suspended solid (TSS) removal for various electrodes configurations (Al–Al, Al–Fe, Fe–Al, Fe–Fe) were analyzed and correlated. Al–Al was found to be the best configuration based on maximum removal of COD and TSS. Ultimately, analysis of associated results indicated that the best arrangement (Al–Al) possessed the following optimal factors: influent COD = 12,627 mg/L, voltage = 19 V, ET = 75 min, and ED = 3 cm for maximum removal of COD (96%) and TSS (99%). Confirmation tests indicated a 95% confidence interval for good agreement of the experimental results and predicted values from fitted correlations. Analysis of outcomes demonstrated that COD concentration was the most effective variable for COD and TSS removal, and, in addition, an increase in ET and a decrease in ED had positive effects. Total corrosion on the Al and Fe plates was 34.8 and 146.6 g, respectively.

Treatment of Palm Oil Mill Effluent by Electrocoagulation Process

2012 ◽  
Vol 610-613 ◽  
pp. 363-367
Author(s):  
Tipakorn Suwannarat ◽  
Nipon Pisutpaisal ◽  
Siriorn Boonyawanich
Keyword(s):  
Palm Oil ◽  
Contact Time ◽  
Batch Reactor ◽  
Oxygen Demand ◽  
Total Suspended Solid ◽  
Suspended Solid ◽  
Steel Plates ◽  
Palm Oil Mill Effluent ◽  
Electrocoagulation Process ◽  
Palm Oil Mill

The purpose of current study was to examine the ability of electrocoagulation in decreasing chemical oxygen demand (COD) and total suspended solid (TSS) constituted in palm oil mill effluent. Bench-scale batch reactor containing two aluminum or steel plates (10 cm width × 30 cm height with 0.1 cm thickness) serving as electrodes with the interval distance of 3 cm was set up. The wastewater with COD concentration of 68,425 mg L-1 was treated in the reactor under the varied direct currents (0.3-1.3 A) and contact time (30-120 min). Sodium chloride was added to the wastewater to obtain the final concentration of 2 g L-1 (conductivity of 10 ms) prior to being fed into the reactor. The results showed that higher treatment efficiency when the aluminum was used as electrodes compared to the steel. COD removal efficiency was directly proportional to the contact time. The maximum COD and TSS removal observed at 1.3 A current input and 60 min contact time are 74.1 and 77.0%, respectively.

Optimization of Process Parameters for the Photocatalytic Degradation of 2,4-Dichlorophenol in Aqueous Solutions

2009 ◽  
Vol 7 (1) ◽  
Author(s):  
Sushil Kumar Kansal ◽  
Manohar Singh ◽  
Dhiraj Sud
Keyword(s):  
Response Surface Methodology ◽  
Photocatalytic Degradation ◽  
Sodium Hypochlorite ◽  
Uv Light ◽  
Batch Reactor ◽  
Oxygen Demand ◽  
Operational Parameters ◽  
Optimization Of Process Parameters ◽  
Oxidant Concentration ◽  
Optimal Values

In the present study, the photocatalytic degradation of 2,4-DCP has been investigated in a batch reactor under UV light in slurry mode using titania P-25 (surface area 50 m2/g) as a photocatalyst and sodium hypochlorite as an oxidant. Variables studied include catalyst dose, pH and oxidant concentration. The rate of degradation was studied in terms of changes in concentration of the pollutant and reduction in chemical oxygen demand. The optimal values of operational parameters leading to 2,4-DCP abatement were obtained by using response surface methodology.

Improving the simultaneous removal of chemical oxygen demand and terephthalic acid in a cross-flow aerobic sludge reactor by using response surface methodology

2015 ◽  
Vol 71 (12) ◽  
pp. 1823-1830
Author(s):  
Dong-Xue Hu ◽  
Yu Tian ◽  
Zhao-Bo Chen ◽  
Hui Ge ◽  
Yu-Bo Cui ◽  
...  
Keyword(s):  
Response Surface Methodology ◽  
Chemical Oxygen Demand ◽  
Response Surface ◽  
Terephthalic Acid ◽  
Cross Flow ◽  
Oxygen Demand ◽  
Interactive Effects ◽  
Operational Parameters ◽  
Removal Rates ◽  
Aerobic Sludge

Central composite design and response surface methodology (RSM) were implemented to optimize the operational parameters for a cross-flow aerobic sludge reactor (CFASR) in remedying mixed printing and dyeing wastewater (MPDW). The individual and interactive effects of three variables, hydraulic retention time (HRT), pH and sludge loading rate (SLR), on chemical oxygen demand (COD) and terephthalic acid (TA) removal rates were evaluated. For HRT of 15.3–19.8 hours, pH of 7.2–8.1 and SLR of 0.4–0.6 kg chemical oxygen demand (COD) per kg mixed liquor suspended solids per day, COD and TA removal rates of the CFASR exceeded 85% and 90%, respectively. The check experiment revealed that the effluent from the optimized CFASR was stable below the limitation of 100 mg COD/L and the TA concentration decreased by 6.0% compared to the usual CFASR. The results verified that the RSM was useful for optimizing the operation parameters of the CFASR in remedying MPDW.

scholarly journals Preliminary screening oxidative degradation methyl orange using ozone/ persulfate

2018 ◽  
Vol 34 ◽  
pp. 02038
Author(s):  
Nur Aqilah Razali ◽  
Che Zulzikrami Azner Abidin ◽  
Ong Soon An ◽  
Fahmi Muhammad Ridwan ◽  
Abdul Haqi Ibrahim ◽  
...  
Keyword(s):  
Methyl Orange ◽  
Contact Time ◽  
Advanced Oxidation Process ◽  
Batch Reactor ◽  
Oxygen Demand ◽  
Cod Removal ◽  
Colour Removal ◽  
Initial Concentration ◽  
Operational Conditions ◽  
Positive Effects

The present study focusing on the performances of advanced oxidation process by using ozonation method towards Methyl Orange based on the efficiency of colour removal and Chemical Oxygen Demand (COD) removal. Factorial design with response surface methodology (RSM) was used to evaluate the interaction between operational conditions, such as pH, initial concentration, contact time and persulfate dosage to obtain the optimum range conditions using a semi-batch reactor. The range of independent variables investigated were pH (3-11), initial concentration (100-500mg/L), contact time (10-50min) and persulfate dosage (20-100mM) while the response variables were colour removal and COD removal of Methyl Orange. The experimental results and statistical analysis showed all the parameters were significant. Thus, from this findings, optimization of operational conditions that had been suggested from the ozone/persulfate RSM analysis were (pH 3, 100 mg/L, 50min, 60mM) that would be produced 99% Colour Removal and 80% COD Removal and help in promoting an efficient ozonation process. The effect list data that showed the most contributed effects to increase the percentages of colour removal were pH and persulfate dosage whereas the contact time and initial concentration had the highest positive effects on the COD removal. Other than that, the interaction between pH, contact time and persulfate dosage were found to be the most influencing interaction. Therefore the least influencing interaction was interaction between persulfate dosage and pH. In this study, the correlation coefficient value R2 for colour removal and COD removal of Methyl Orange were R2= 0.9976 and R2= 0.9924 which suggested a good fit of the first-order regression model with the experimental data.

scholarly journals Electrochemical treatment of spent tan bath solution for reuse

2016 ◽  
Vol 8 (1) ◽  
pp. 123-134
Author(s):  
Amel Benhadji ◽  
Mourad Taleb Ahmed ◽  
Hayet Djelal ◽  
Rachida Maachi
Keyword(s):  
Removal Efficiency ◽  
Contact Time ◽  
Batch Reactor ◽  
Oxygen Demand ◽  
Electrochemical Treatment ◽  
Optimum Operating ◽  
Operational Parameters ◽  
High Concentration ◽  
Leather Processing ◽  
Chromium Salt

Abstract A spent tanning bath contains high concentration of salts, chromium and protein. The treatment system for removal of chlorides or chromium from this effluent is expensive. In this context this waste has to be reused. Our study focuses on the application of advanced oxidation processes for protein removal present in a tanning bath. To improve the quality of the chromium tanning bath, two electrochemical processes (electrooxidation and peroxi-electrocoagulation process, PEP) are investigated in a batch reactor. The effects of operational parameters such as reactor configuration, current density and electrolysis time on chemical oxygen demand (COD) and protein removal efficiency are examined. Results indicated that under the optimum operating range for process, the COD and protein removal efficiency reached 53 and 100%, respectively. The optimum values are determined for the hybrid process (PEP) under 0.13 A·cm−2 over 2 h. The treated tanning bath is used as a tanning solution in leather processing. The influence of chromium salt dose, pH solution, stirring time and contact time on the leather characteristic is evaluated. The hides tanned after the addition of 0.25% of commercial chromium salt, at pH solution, leaving them stirring for 4 h with a contact time of 2 days, and showed good hydrothermal stability and physical characteristics of leather.

Peranan BOD biosensor untuk proses optimasi pengolahan limbah sintetik di SBR

2019 ◽  
Vol 1 (2) ◽  
pp. 1
Author(s):  
Lindawati Lindawati
Keyword(s):  
Biochemical Oxygen Demand ◽  
Sequencing Batch Reactor ◽  
Batch Reactor ◽  
Oxygen Demand

Sebuah Sequencing Batch Reactor (SBR) digunakan untuk mengevaluasi peranan Biochemical Oxygen Demand (BOD) biosensor dalam proses optimasi proses pengolahan nutrien karbon, nitrogen dan fosfat. Hasil penelitian menunjukkan bahwa BOD biosensor dapat dipergunakan untuk penentuan karbon organik, sehingga reduksi siklus SBR dapat dilakukan dan efisiensi proses meningkat. Pola konsumsi karbon organik ditemukan dengan adanya ‘tanda diam’ pada fase anoksik/ anaerobik, di mana dari tanda ini, fase aerobik dapat segera dimulai. Reduksi durasi siklus SBR dari 8 jam menjadi 4 jam meningkatkan efiesiensi pengolahan C, N dan P yang meningkat pula (hampir dua kali lebih tinggi).

Estimation of oxygen transfer rate in sequencing batch reactor

1996 ◽  
Vol 34 (3-4) ◽  
pp. 413-420
Author(s):  
Y. C. Liao ◽  
D. J. Lee
Keyword(s):  
Dissolved Oxygen ◽  
Oxygen Transfer ◽  
Transfer Rate ◽  
Sequencing Batch Reactor ◽  
Batch Reactor ◽  
Oxygen Transfer Rate ◽  
Intermittent Aeration ◽  
Transient Effects ◽  
Operational Parameters ◽  
Transient Model

Transient model of oxygen transfer rate in a sequencing batch reactor is derived and solved numerically. The dissolved oxygen response under several conditions is analyzed. Effects of operational parameters and liquid bath height are studied. When with short, intermittent aeration periods, the transient effects on oxygen transfer rate may be substantial and should be taken into considerations. An example considering bioreaction is also given.

scholarly journals Catalytic wet oxidation of high concentration pharmaceutical wastewater with Fe3+ as catalyst

2018 ◽  
Vol 2017 (3) ◽  
pp. 661-666
Author(s):  
Xu Zeng ◽  
Jun Liu ◽  
Jianfu Zhao
Keyword(s):  
Oxygen Pressure ◽  
Batch Reactor ◽  
Oxygen Demand ◽  
Kinetic Studies ◽  
Cod Removal ◽  
Wet Oxidation ◽  
Catalytic Wet Oxidation ◽  
Pharmaceutical Wastewater ◽  
High Concentration ◽  
Temperature Time

Abstract Catalytic wet oxidation of high concentration pharmaceutical wastewater with Fe3+ as catalyst was carried out in a batch reactor. Results showed that the degradation of pharmaceutical wastewater was enhanced significantly by Fe3+. The effects of reaction parameters, such as the catalyst dose, reaction temperature, time, and initial oxygen pressure, were discussed. The chemical oxygen demand (COD) removal increased with the increases of catalyst dose, temperature, time and oxygen supply. With the initial COD 34,000–35,000 mg/L, approximately 70% COD removal can be achieved under the conditions of catalyst 1.0 g and oxygen pressure 1.0 MPa at 250 °C after 60 min. The results of kinetic studies showed that two reaction steps existed in this oxidation process, which followed an apparent first-order rate law. This process provides an effective approach for the pretreatment of high concentration pharmaceutical wastewater.

scholarly journals Post-treatment of tannery wastewater using pilot scale horizontal subsurface flow constructed wetlands (polishing)

2017 ◽  
Vol 77 (4) ◽  
pp. 988-998 ◽  
Author(s):  
Tadesse Alemu ◽  
Andualem Mekonnen ◽  
Seyoum Leta
Keyword(s):  
Removal Efficiency ◽  
Batch Reactor ◽  
Subsurface Flow ◽  
Oxygen Demand ◽  
Pilot Scale ◽  
Surface Flow ◽  
Tannery Wastewater ◽  
Treated Effluent ◽  
Horizontal Subsurface Flow ◽  
Pollutants Removal

Abstract In the present study, a pilot scale horizontal subsurface flow constructed wetland (CW) system planted with Phragmites karka; longitudinal profile was studied. The wetland was fed with tannery wastewater, pretreated in a two-stage anaerobic digester followed by a sequence batch reactor. Samples from each CW were taken and analyzed using standard methods. The removal efficiency of the CW system in terms of biological oxygen demand (BOD), chemical oxygen demand (COD), Cr and total coliforms were 91.3%, 90%, 97.3% and 99%, respectively. The removal efficiency for TN, NO3− and NH4+-N were 77.7%, 66.3% and 67.7%, respectively. Similarly, the removal efficiency of SO42−, S2− and total suspended solids (TSS) were 71.8%, 88.7% and 81.2%, respectively. The concentration of COD, BOD, TN, NO3−N, NH4+-N, SO42 and S2− in the final treated effluent were 113.2 ± 52, 56 ± 18, 49.3 ± 13, 22.75 ± 20, 17.1 ± 6.75, 88 ± 120 and 0.4 ± 0.44 mg/L, respectively. Pollutants removal was decreased in the first 12 m and increased along the CW cells. P. karka development in the first cell of CW was poor, small in size and experiencing chlorosis, but clogging was higher in this area due to high organic matter settling, causing a partial surface flow. The performance of the pilot CW as a tertiary treatment showed that the effluent meets the permissible discharge standards.

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