Comparative experimental study on the COD removal in aqueous solution of pesticides by the electrocoagulation process using monopolar iron electrodes

2019 ◽  
Author(s):  
Chem Int
Keyword(s):  
Contact Time ◽  
Iron Concentration ◽  
Cod Removal ◽  
Optimum Conditions ◽  
Cost Of Treatment ◽  
Iron Electrodes ◽  
Initial Ph ◽  
Electrocoagulation Process ◽  
Important Idea ◽  
The Cost

A comparative study for the COD removal of Chlorpyrifos, Fenitrothion (3%) and Acetamiprid (20%) by electrocoagulation process was performed. The effect of various parameters of electrocoagulation (EC) on removal efficiency was studied and optimized. The COD removal using nonpolar iron electrodes was affected by current density, contact time, initial pH and initial concentration of pesticides. The optimum conditions for the electrocoagulation process were identified as contact time (4, 5 and 10 min), for a maximum abatement of 100 mg/L pesticide solution, respectively. The results provide an important idea for the development electrocoagulation process to remove pesticides significantly along with COD removal using moderate iron concentration, thereby lowering the cost of treatment. Moreover, results show that the pesticide was removal quickly with a maximum rate of 87% for the contact time of 4 min, which revealed that pesticides wastewater can be treated using electrocoagulation.

scholarly journals Effect of various parameters in removing Cr and Ni from model wastewater by using electrocoagulation

2013 ◽  
Vol 15 (4) ◽  
pp. 494-503 ◽  
Keyword(s):  
Removal Rate ◽  
Initial Value ◽  
Effective Surface ◽  
Initial Concentration ◽  
Iron Electrodes ◽  
Electrode Combination ◽  
Initial Ph ◽  
Electrocoagulation Process ◽  
Aluminum Electrodes ◽  
A Current

<p>The performance of a laboratory scale electrocoagulation system for the removal of Cr and Ni from model wastewater was studied systematically using iron and aluminum electrodes with an effective surface area of 13.8 cm2 and a distance of 4 cm. The influence of several parameters, such as initial concentration, electrode combination, current supply and initial pH was investigated during electrocoagulation process. The increase in initial concentration favored removal rate, did not affect nickel removal, but restricted chromium removal, thus indicating its required mechanism of reducing hexavalent ion to trivalent. The best removal efficiency, when metals existed separately in treated solutions, was accomplished with the use of iron electrodes for Cr (50%) and with aluminum electrodes for Ni (90%). When metals co-existed, iron electrodes achieved the best result, which was 76% for Cr and 82% for Ni, leaving 30 mg l-1 and 17 mg l-1 of residual concentrations, respectively, after 180 min of treatment. Solutions&rsquo; nominal pH appeared to be optimal, since increasing or decreasing their initial value did not benefit the electrocoagulation process. Chromium and nickel simultaneous removal was best achieved for conditions of 100 mg l-1 initial concentration, pH 5 and a current of 0.8 A.</p>

Kinetic degradation of guar gum in oilfield wastewater by photo-Fenton process

2016 ◽  
Vol 75 (1) ◽  
pp. 11-19 ◽  
Author(s):  
Shunwu Wang ◽  
Ziwang Li ◽  
Qinglong Yu
Keyword(s):  
Guar Gum ◽  
Oxidative Degradation ◽  
Oxygen Demand ◽  
Cod Removal ◽  
Fenton Process ◽  
Experimental Conditions ◽  
Initial Concentration ◽  
Initial Ph ◽  
Main Component ◽  
The Cost

Guar gum is considered as a main component of oilfield wastewater. This work is intended to optimize the experimental conditions (H2O2 dosage, Fe2+ dosage, initial concentration of organics, initial pH and temperature) for the maximum oxidative degradation of guar gum by Fenton's reagent. The kinetics of guar gum removal were evaluated by means of the chemical oxygen demand (COD) and the absorbance measurements. The batch experiment results showed that the optimum conditions were: H2O2 dosage, 10,000 mg/L; Fe2+dosage, 2,000 mg/L; initial concentration of organics, 413 mg/L; pH, 3 and temperature, 35 °C, under which the COD removal could reach 61.07% and fairly good stability could be obtained. Under the optimum experimental conditions, using UV irradiation to treat the wastewater, the photo-Fenton systems can successfully eliminate COD from guar gum solution. The COD removal always obeyed a pseudo-first-order kinetics and the degradation rate (kapp) was increased by 25.7% in the photo-Fenton process compared to the Fenton process. The photo-Fenton system needed less time and consequently less quantity of H2O2 to obtain the same results as the Fenton process. The photo-Fenton process needs a dose of H2O2 20.46% lower than that used in the Fenton process to remove 79.54% of COD. The cost of the photo/Fenton process amounted to RMB9.43/m3, which was lower than that of the classic Fenton process alone (RMB10.58/m3) and the overall water quality of the final effluent could meet the class Ι national wastewater discharge standard for the petrochemical industry of China.

Hydrophobic Deep Eutectic as a New Solvent for Liquid-Liquid Extraction and Its Potential Application in Ligandless Extraction of Cu (II)

2020 ◽  
Vol 7 (1) ◽  
pp. 32-39
Author(s):  
Nur Hidayah Sazali ◽  
Tham Wei Jie ◽  
Nurul Yani Rahim
Keyword(s):  
Contact Time ◽  
Capric Acid ◽  
Cost Effective ◽  
Liquid Extraction ◽  
Environmentally Benign ◽  
Optimum Conditions ◽  
Initial Concentration ◽  
Liquid Liquid Extraction ◽  
Ft Ir ◽  
The Cost

Background: The cost-effective and environmentally benign solvent of hydrophobic deep eutectic (DES) was prepared for the removal of Cu (II) from aqueous solution. Hydrophobic DES has been gaining increasing attention from researchers for the replacement of hazardous solvent consumption in liquid-liquid extraction (LLE). Objectives: To synthesize the hydrophobic DES and optimize the parameters for ligandless LLE using DES, and LLE with DES-LIG, respectively. Materials and Methods: The fatty acid-based DES was prepared using a mixture of capric acid (C10) and lauric acid (C12) as a potential solvent for the extraction of Cu (II). The DES was characterized via FT-IR, NMR, and TGA. The removal percentage of Cu (II) was compared between ligandless LLE and other conventional LLE techniques. DES was used as the solvent in the ligandless LLE, while 1,10-phenanathroline ligand with DES (DES-LIG) was used in the conventional LLE techniques. The optimized parameters such as pH, initial concentration, and contact time for Cu (II) removal were studied and analyzed using atomic absorption spectroscopy (AAS). Results and Discussion: The ligandless LLE with DES demonstrated the highest removal percentage of Cu (II) at optimum conditions of pH 8, initial concentration of 80 μg mL-1, and contact time of 45 minutes. Conclusion: The removal of Cu (II) was more effective in ligandless LLE using DES.

scholarly journals Sorption of Sr-85 and Am-241 from liquid radioactive wastes by alginate beads

Nukleonika ◽  
2015 ◽  
Vol 60 (4) ◽  
pp. 927-931 ◽  
Author(s):  
Agata Oszczak ◽  
Leon Fuks
Keyword(s):  
Contact Time ◽  
Adsorption Process ◽  
Decontamination Factor ◽  
Alginate Beads ◽  
Radioactive Wastes ◽  
Batch Experiments ◽  
Optimum Conditions ◽  
Liquid Radioactive Wastes ◽  
Initial Aqueous Solution ◽  
Initial Ph

Abstract The paper reports the adsorption of strontium(II) and americium(III) from aqueous solutions onto calcium alginate (CaA), barium alginate (BaA) and strontium alginate (SrA) beads. Adsorption process was studied in batch experiments as a function of the initial pH of the solution and the contact time. All sorbents were examined by the termogravimetric analysis (TG). Laboratory obtained spherical beads of CaA, BaA and SrA seem to be good metal sorbents from liquid radioactive wastes. A contact time of about 4 h and neutral pH of the initial aqueous solution have been proposed to be optimum conditions for Sr-85 and Am-241 removal from the contaminated solutions using alginate sorbents. Laboratory obtained beads of CaA, BaA and SrA are characterized by the decontamination factor (DF) equal to 85% for Sr(II) and 90% for Am(III).

Treatment of acidic water from Bekok River using open limestone channel

2007 ◽  
Vol 7 (4) ◽  
pp. 65-71 ◽  
Author(s):  
A. Aris ◽  
N. Mokhtar ◽  
R. Muslim ◽  
Z. Ujang ◽  
Z. A-Majid
Keyword(s):  
Contact Time ◽  
Soil Characteristics ◽  
Low Ph ◽  
Agricultural Activities ◽  
Raw Water ◽  
Acidic Water ◽  
Initial Ph ◽  
Industrial Use ◽  
The Cost

Bekok River is one of the raw water resources for Batu Pahat treatment plants which supply treated water for domestic, institutional, commercial and industrial use. Due to soil characteristics and agricultural activities in the catchment area, pH of lower than 5.5 is common to the river, particularly in the stretch where the water intake point is located. However, at times, Bekok River registered low pH of less than 3.5 and hence caused problems to the treatment plants. The cost to neutralise the water increased and treatment scheduling became more complicated. A preliminary laboratory scale study has been conducted to determine the viability of using an open limestone channel as an in-situ pH treatment in the river. Two sets of experiments using synthetic and actual raw waters with various sizes and amount of limestone were carried out. Results indicate the viability of the process. Depending on the initial pH and acidity of the raw water, the pH can rise to 6.0 within 30 minutes of contact time. The amount and size of limestone was found to play an important role in minimising the contact time.

The Study of Copper (II) Removal from Aqueous Solutions by Adsorption Using Corn Stalk Material

2012 ◽  
Vol 610-613 ◽  
pp. 1950-1953
Author(s):  
Zheng Jun Gong ◽  
Wenbo Zhou ◽  
Zhong Ping Qiu
Keyword(s):  
Aqueous Solutions ◽  
Contact Time ◽  
Freundlich Isotherm ◽  
Isotherm Models ◽  
Corn Stalk ◽  
Absorption Process ◽  
Optimum Conditions ◽  
Batch Mode ◽  
Langmuir Adsorption ◽  
Initial Ph

In this study, removal of copper(Ⅱ) from aqueous solutions was examined using corn stalk. In the batch mode adsorption studies, the effects of initial pH and contact time on the copper(Ⅱ) adsorption by the corn stalk have been studied. The results show that: the pH 6.0 and contact time 8 hrs is optimum conditions of this absorption process when the dosage of corn stalk is 0.1g. In the isotherm studies, the Langmuir and Freundlich isotherm models were applied. The R2 of the Langmuir and Freundlich isotherm are 0.981 and 0.944 respectively. The Langmuir adsorption capacity Qmax is 54.05 mg/g. The goodness of fitness was obtained with the Langmuir and Freundlich adsorption isotherms.

Polishing of treated palm oil mill effluent (POME) from ponding system by electrocoagulation process

2016 ◽  
Vol 73 (11) ◽  
pp. 2704-2712 ◽  
Author(s):  
Mohammed J. K. Bashir ◽  
Tham Mau Han ◽  
Lim Jun Wei ◽  
Ng Choon Aun ◽  
Salem S. Abu Amr
Keyword(s):  
Palm Oil ◽  
Current Density ◽  
Contact Time ◽  
Oxygen Demand ◽  
Complete Removal ◽  
Palm Oil Mill Effluent ◽  
Process Variables ◽  
Initial Ph ◽  
Electrocoagulation Process ◽  
Palm Oil Mill

As the ponding system used to treat palm oil mill effluent (POME) frequently fails to satisfy the discharge standard in Malaysia, the present study aimed to resolve this problem using an optimized electrocoagulation process. Thus, a central composite design (CCD) module in response surface methodology was employed to optimize the interactions of process variables, namely current density, contact time and initial pH targeted on maximum removal of chemical oxygen demand (COD), colour and turbidity with satisfactory pH of discharge POME. The batch study was initially designed by CCD and statistical models of responses were subsequently derived to indicate the significant terms of interactive process variables. All models were verified by analysis of variance showing model significances with Prob &gt; F &lt; 0.01. The optimum performance was obtained at the current density of 56 mA/cm2, contact time of 65 min and initial pH of 4.5, rendering complete removal of colour and turbidity with COD removal of 75.4%. The pH of post-treated POME of 7.6 was achieved, which is suitable for direct discharge. These predicted outputs were subsequently confirmed by insignificant standard deviation readings between predicted and actual values. This optimum condition also permitted the simultaneous removal of NH3-N, and various metal ions, signifying the superiority of the electrocoagulation process optimized by CCD.

Biochar from Oil Palm Frond to Reduce Fe Ions in Artificial Solution and Peat Water

2021 ◽  
Vol 1162 ◽  
pp. 49-56
Author(s):  
Yasdi Yasdi ◽  
Rinaldi Rinaldi ◽  
Febri Juita Anggraini ◽  
Tiara Yulianti
Keyword(s):  
Functional Groups ◽  
Oil Palm ◽  
Contact Time ◽  
Iron Concentration ◽  
Material Surface ◽  
Batch Adsorption ◽  
Iron Ions ◽  
Optimum Conditions ◽  
Palm Fronds ◽  
Fe Ions

Raw oil palm fronds (OPF-R) converted into biochar (OPF-B) by torrefaction processes at temperatures range of 200 °C to 300 °C. This study aims to evaluate OPF-B performance to reduce iron ions in artificial solutions and peat water. Batch adsorption carried out at room temperature by stirring (175 rpm) using an orbital shaker. Some parameters observed included optimum torrefaction temperature, optimum conditions of Fe ions adsorption (optimum pH and contact time) and sorption isotherm. Metal content measured using atomic absorption spectroscopy (AAS). Functional groups on material surface characterized using Fourier Transform Infrared (FT-IR). Torrefaction at 260 °C produces biochar with the highest efficiency in removing iron ions. Both functional groups C=O and C-O attributed to lignocellulose on OPF-B were diminished and absorption band of aromatic (C=C) increased which caused by torrefaction. The optimum conditions for removal of Fe ions at pH 5 and 30 minutes contact time. Adsorption process follows the Langmuir Isotherm which indicates the formation of a monolayer with qmax 111.11 mg/g. Amount of 0.025 g OPF-B able to reduce iron concentration from 13.960 mg/L to 0.746 mg/L in 100 mL peat water (has complied with Indonesian clean water standard for iron concentration).

scholarly journals Removal of hexavalent chromium from electroplating wastewater by electrocoagulation with iron electrodes

2013 ◽  
Vol 13 (4) ◽  
pp. 412-418 ◽  
Keyword(s):  
Hexavalent Chromium ◽  
Current Density ◽  
Metal Ion ◽  
Removal Rate ◽  
Ion Concentration ◽  
Wastewater Sample ◽  
Electroplating Wastewater ◽  
Iron Electrodes ◽  
Initial Ph ◽  
Electrocoagulation Process

The performance of electrocoagulation using iron electrodes for the removal of hexavalent chromium from synthetic aqueous solutions and actual industrial electroplating wastewater was studied. Parameters affecting the electrocoagulation process, such as initial pH, applied current density, initial metal ion concentration, COD and time of electroprocessing were investigated. The optimum pH was found to be in the range 4-8. Initial chromium concentrations of 200 – 800 mg L-1 did not influence its removal rate. Higher concentrations were reduced significantly in relatively less time than lower concentrations. Increased current density accelerated the electrocoagulation process, however, on cost of higher energy consumption. Results revealed that best removal was achieved at a current density 40 mA cm-2. The electrocoagulation process was successfully applied to the treatment of an electroplating wastewater sample. Its Cr (VI) ion concentration and COD were effectively reduced under the admissible limits in 50 minutes of electroprocessing.

The In Vitro Antibiofilm Activity of Water Leaf Extract of Papaya (Carica papaya L.) against Pseudomonas aeruginosa

2017 ◽  
Vol 2 (3) ◽  
pp. 150-163
Author(s):  
Ekajayanti Kining ◽  
Syamsul Falah ◽  
Novik Nurhidayat
Keyword(s):  
Pseudomonas Aeruginosa ◽  
Contact Time ◽  
Cell Attachment ◽  
Water Extract ◽  
Opportunistic Pathogen ◽  
Bacterial Biofilm ◽  
Antibiofilm Activity ◽  
Bacterial Survival ◽  
Optimum Conditions

Pseudomonas aeruginosa is one of opportunistic pathogen forming bacterial biofilm. The biofilm sustains the bacterial survival and infections. This study aimed to assess the activity of water extract of papaya leaves on inhibition of cells attachment, growth and degradation of the biofilm using crystal violet (CV) biofilm assay. Research results showed that water extract of papaya leaves contains alkaloids, tanins, flavonoids, and steroids/terpenoids and showed antibacterial activity and antibiofilm against P. aeruginosa. Addition of extract can inhibit the cell attachment and was able to degrade the biofilm of 40.92% and 48.058% respectively at optimum conditions: extract concentration of 25% (v/v), temperature 37.5 °C and contact time 45 minutes. With a concentration of 25% (v/v), temperature of 50 °C and the contact time of 3 days, extract of papaya leaves can inhibit the growth of biofilms of 39.837% v/v.

Sign in / Sign up

Export Citation Format

Share Document