Wyniki wyszukiwania - BazTech

1

Treatment of Wastewater from Oil Refineries by a Combination of Electrocoagulation with Photocatalytic Processes Using Immobilized Nano-Zinc Oxide Photocatalyst

Hameed Qasem Kadhum, Mohammed Wadood Taher

Journal of Ecological Engineering

|

2024

|

Vol. 25, nr 11

109--123

EN

The present work aimed to reduce the COD of petroleum refinery wastewater using individual and combined processes based on the electrocoagulation and photocatalytic process with immobilized nano-zinc oxide. Also, energy savings alongside performance improvements were evaluated within this conglomerated system. Results showed that the removal efficiency of COD was 72% after 120 min when using electrocoagulation process under the given conditions (15 mA/cm2, pH of 7, and flow rate of 0.5 L/min). Regarding the process involving photocatalysis, the removal efficiency of COD was 76% after 120 min under the analyzed conditions (ZnO concentration of 80 g/m2, pH of 7, power of irradiation equal to 65 W, and flow rate of 0.5 L/min). Several combined sequential and simultaneous systems were tested. Results confirmed that the simultaneous photo-EC system operated at 30 min is the best one and has the ability to achieve COD removal of 82% under the studied conditions (15 mA/cm2, pH of 7, and flow rate of 0.5 L/ min, ZnO concentration of 80 g/m2, and 65 W). Furthermore, the further notable features of the combined simultaneous photo-EC system were operating at shorter operation time and lowering dissolution rate of anode electrode (0.2 gram) that makes the system to be the most economic process with an energy consumption of 28.44 kWh/kg COD.

2

Toxicity Assessment of Tanning Effluents Treated via Electrocoagulation and Ozonation Using a Bioassay with Lactuca sativa L.

Aguilar-Ascón Edwar, Marrufo-Saldaña Liliana, Barra-Hinojosa Julio Alexis

Journal of Ecological Engineering

|

2024

|

Vol. 25, nr 9

316--327

EN

In this study, the aim is to assess the toxicity of tannery wastewater treated with electrocoagulation and ozonation to determine the suitability of the approach for application, while maintaining the environmental quality of receiving water bodies and/or sewer systems. For this, an electrocoagulation reactor and an ozonation tank were built considering current intensity (I), treatment time (T), and ozone concentration O3 as operating factors. Acute toxicity tests were conducted using Lactuca sativa L. lettuce seeds for the raw sample (MI), sample treated with electrocoagulation (EC), and sample treated with EC and ozonation (EC+OZ). The toxicity parameters assessed in this study were the absolute germination (AG), germination index (GI), and average inhibition concentration (EC50). The electrocoagulation reactor achieved 92% removal efficiency for total suspended solid (TSS) and 10% removal efficiency for chemical oxygen demand (COD) with a current intensity of 7A and a treatment time of 30 min. In addition, the COD was further reduced in the ozonation tank by 18% with an ozone dosage of 10 g/h and a contact time of 30 min. Despite these treatments, EC50 values indicated acute toxicity in all three samples. The ANOVA analysis (p value of 0.05) revealed no significant differences between the GI values for the three samples, suggesting that toxicity did not decrease substantially, despite treatment. This is attributed to the incomplete removal of the pollutant load, expressed as COD, and formation of recalcitrant and toxic compounds during treatment processes. This work demonstrates the importance of including the “toxicity” variable in the assessment of treatments to conduct them in an integral way and preserve the environmental quality of receiving water bodies.

3

Reducing Tannery Wastewater Pollutants through a Magnetic-Field and Ozone-Treatment Electrocoagulation System using Response Surface Methodology

Aguilar Ascon Edwar, Marrufo Saldaña Liliana, Neyra Ascón Walter

Journal of Ecological Engineering

|

2024

|

Vol. 25, nr 1

74--83

EN

This study assessed the effectiveness of integrating electrocoagulation, magnetic fields, and ozonation technologies to remove chemical oxygen demand (COD) and total suspended solids (TSS) from tannery wastewater. Furthermore, the effects of their key operating factors were determined. To achieve this goal, an electrocoagulation reactor coupled with a magnetic-field generator was used and the response surface methodology was applied through a Box-Behnken experimental design. Here, current intensity (I), treatment time (T), and ozone concentration (O3) are considered the influencing factors. Likewise, the removal percentages of COD and TSS serve as response indicators. The results indicate that T, I, and O3 are significant for the removal of COD and TSS at a confidence level of p-value < 0.05. For COD, the optimal operating conditions are I = 6.8 A, T = 30 min, and O3 = 10 mg/l; and for TSS, the optimal conditions are I = 5.72 A, T = 28 min, and O3 = 7.8 mg/l. These conditions yield removal efficiencies of 41.8% for COD and 97.9% for TSS. The findings suggest that integrating these technologies is a viable alternative for mitigating the pollution issues caused by the tannery industry.

4

Electrocoagulation Process for Chromium Removal in Leather Tanning Effluents

Hartati Etih, Hasyyati Lina, Permadi Didin Agustian, Djaenudin Djaenudin, Permana Dani, Putra Herlian Eriska

Journal of Ecological Engineering

|

2024

|

Vol. 25, nr 4

1--13

EN

The application of chromium sulfate in tanning operations yields chromium-laden wastewater, posing significant environmental risks. This research explored electrocoagulation as a remedial measure for tannery effluents. Varied parameters–pH (4, 7, 10), electric currents (0.5, 1.0, 1.5 A), and durations (1, 2, 3 h)–were optimized to diminish the chromium content. Evaluation based on initial and final chromium concentrations demonstrated 99.94% removal efficiency at pH 4, 1.5 A, over 3 hours. Achieving the 0.6 mg/L target concentration occurred at pH 4, 0.91 A, for 3 hours. This study highlighted the effectiveness of electrocoagulation in chromium mitigation within tannery wastewater, showcasing its potential as an environmentally sustainable remediation.

5

Effects of Linear Alkylbenzene Sulfonate and Polyoxyethylene Sorbitan Monolaurate Surfactants on Pristine and Aged Microplastic Removal by Electrocoagulation

Teran Francisco Javier Cuba, de Oliveira Luísa Rodrigues, Cuba Renata Medici Frayne

Journal of Ecological Engineering

|

2024

|

Vol. 25, nr 6

51--62

EN

Various types of pollutants are present in wastewaters, which can combine and form even more toxic components or interfere with the treatments used for purification. Among emerging contaminants are microplastics and surfactants, which coexist in different types of wastewaters. This study aimed to assess the effects of the anionic surfactant linear alkylbenzene sulfonate (LAS) and the nonionic surfactant polyoxyethylene sorbitan monolaurate (Tween 20) on the removal of microplastics from pristine and aged glitter PVC surfaces using electrocoagulation with aluminum electrodes. To avoid interference from other substances, a benchtop reactor operating in batch mode with particles suspended in ultrapure water was developed for the experiments. The analysis methods employed included counting with the aid of a magnifying glass, gravimetry, zeta potential measurements, and scanning electron microscopy. The results revealed that the addition of surfactants led to a reduction in the removal efficiency of plastic microparticles. The lowest removal percentages were observed at a concentration of 100 ppm, and the inclusion of Tween 20 resulted in a decrease of 23% for pristine microplastics and 45% for aged microplastics. In contrast, the addition of LAS led to a decrease of 6% for pristine microplastics and 24% for aged microplastics. Therefore, the decrease in removal efficiency was more pronounced for degraded microplastics in both the Tween 20 and LAS experiments. Comparing the reduction in removal efficiency between the two types of surfactants, it can be observed that the nonionic surfactant (Tween 20) had a greater impact on the removal of microplastics by electrocoagulation.

6

Analysis of the State of the Municipal Solid Waste Landfill in Ivano-Frankivsk, Ukraine, the Composition of the Leachate, and Promising Technologies for its Treatment

Chelyadyn Lubomyr, Khomyn Volodymyr, Slyuzar Andriy, Chelyadyn Volodymyr, Shymanskyi Volodymyr

Journal of Ecological Engineering

|

2024

|

Vol. 25, nr 3

132--142

EN

The characteristics of the hydrogeology of the municipal solid waste landfill in Ivano-Frankivsk are given. Accumulation of waste in landfills causes environmental problems due to pollution of the atmosphere, water resources, and soil. It was established that there is practically no contamination of the water horizon with infiltrate. Commissioning of the leachate pipeline, which feeds part of the leachate to the city’s treatment facilities, solves the problem of the accumulation of leachate at the landfill, however, creates an additional burden on these facilities. The composition of the infiltrate was analyzed. It was confirmed that the main harmful pollutants of infiltrates are oil products, nitrogen-containing compounds, dyes, humic compounds, and heavy metals. The main methods of cleaning of infiltrates abroad and in Ukraine are characterized. Based on the analysis of the available impurities, for the purification of the infiltrate, it is proposed to use the technology of physical-electrochemical wastewater treatment, which includes their treatment in electrocoagulators and the separation of coagulated impurities in a thin-layer settling tank. Our studies showed that during infiltrate purification up to normative indicators of its discharge to treatment plants are not reached and it is worth using additional treatment of the infiltrate with oxidizers. As a result of exploratory studies, it is proposed to carry out additional treatment with hypochlorite ions, which can be obtained during the electrolysis of the infiltrate on an inert anode. Cleaning the infiltrate using the described technology will reduce environmental pollution, which means increasing the level of environmental safety of the solid waste landfill.

7

Electro-coagulation technique using iron [Fe] and aluminium [Al] for microplastics removal from fashion industry wastewater, Thailand

Rasheed Zulakha

Economics and Environment

|

2024

|

No. 3

art. no. 826

EN

The textile sector is considered as the 3rd largest source of water pollution and land degradation during 2020. 20% of the world’s water pollution is linked with textile production and utilisation. Textile washing releases 14 million tons of microplastics, according to European Environmental Agency estimates. Wastewater Treatment Plant [WWTP] has declared everyday normal releases of more than 4 million MP particles because of its tiny size (<5 mm) and low thickness (<1.2 g/cm3). Electrochemistry for the removal of tinny pollutants is recognised as an efficient treatment mechanism. The main aim of this research paper is to identify the efficiency of electro-coagulation technology using Fe and Al as anode and cathode in microplas-tic removal from Thailand’s textile industries. Results show the maximum 100% microplastic removal efficiency with pH 10 at a current density of 30 A/m2 within 60 minutes of the current supply. This paper helps to understand the role of electro-coagu-lation in Thailand textile wastewater plants and adopt the best available technique for microplastic removal.

8

Use of Nano Co-Ni-Mn Composite and Aluminum for Removal of Artificial Anionic Dye Congo Red by Combined System

Jasim Reman A., Salman Rasha H.

Ecological Engineering & Environmental Technology

|

2024

|

Vol. 25, iss. 7

133--149

EN

The removal of congo red (CR) is a critical issue in contemporary textile industry wastewater treatment. The current study introduces a combined electrochemical process of electrocoagulation (EC) and electro-oxidation (EO) to address the elimination of this dye. Moreover, it discusses the formation of a triple composite of Co, Mn, and Ni oxides by depositing fixed salt ratios (1:1:1) of these oxides in an electrolysis cell at a constant current density of 25 mA/cm2 . The deposition ended within 3 hours at room temperature. X-ray diffractometer (XRD), field emission scanning electron microscopy (FESEM), atomic force microscopy (AFM), and energy dispersive X-ray (EDX) characterized the structural and surface morphology of the multi-oxide sediment. Marvelously, the deposition has simultaneously occurred on both anodic and cathodic graphite electrodes. These electrodes besides aluminum (Al) are employed as anodes in the EC-EO system, and the results were optimized by response surface methodology (RSM). The optimum operating conditions were a current density of 6 mA/cm2 , pH = 7, and NaCl of 0.26 g/L. The results showed that the combined system eliminated more than 99.91% of the congo red dye with a removal of chemical oxygen demand (COD) of around 97% with 1.64 kWh/kg of dye of the consumed energy. At low current density, the current delivered for the composite anode was more than for the Al anode with the same surface area. On top of this superiority, the EC-EO scenario is a practical hybrid process to remove CR in an environmentally friendly pathway.

9

Efficient and Sustainable Remediation of Refinery Wastewater Using Electrocoagulation and Advanced Oxidation Techniques

Albrazanjy Mohammed G., Hasan Muayad M., Al-Jadir Thaer, Kadhim Wafaa A., Rahim Mohd Hasbi Ab., Al-Rubaiey Najem A.

Ecological Engineering & Environmental Technology

|

2024

|

Vol. 25, iss. 3

197--210

EN

Effluent wastewater from industrial processes needs to be properly treated before being discharged into the environment. Conventional procedures for handling this wastewater can be problematic due to the presence of toxic elements, time constraints, and complexity. However, a new electrochemical procedure has been developed as an effective method for remediation. In a recent study, refinery wastewater was successfully treated using an electrochemical technique combined with ultrasonic irradiation and photocatalysis. The study found that electrocoagulation, which uses cheap and recyclable metal electrodes, was a simple, efficient, practical, and cost-effective way to handle refinery wastewater. Various parameters were investigated, including electrode metals, operating time, applied voltage, pH, inter-electrode gap, and temperature. The aim was to determine the optimal configuration for pollutant removal. The study also focused on the synergistic effects of combining electrocoagulation and photocatalysis to improve the efficiency of contaminant removal in oily wastewater. By integrating these two treatment technologies, the researchers aimed to enhance pollutant removal rates, energy efficiency, and overall system performance. The research provided valuable insights into the feasibility, optimization parameters, and applicability of the electrocoagulation-photocatalysis process for remediating organic contaminants in oily wastewater industrial effluents. The results showed that electrocoagulation, especially when combined with ultrasonic irradiation and TiO2 photocatalysis, was highly effective in pollutant removal within a short timeframe. These findings support the implementation of this procedure for remediating most industrial wastewater.In conclusion, the study contributes to the development of more effective and sustainable water treatment strategies. The electrocoagulation-photocatalysis process shows promise in addressing the remediation of organic contaminants in oily wastewater from industrial processes.

10

Efficiency Evaluation of the Continuous Flow Electrocoagulation Process for the Treatment of Oily-Contaminated Wastewater

Elwakil Abdelaleem, El-Sayed Abd-Elaziz, Ayoub Mohamed, El-Morsy Ahmed

Ecological Engineering & Environmental Technology

|

2024

|

Vol. 25, iss. 12

203--217

EN

Wastewater generated by edible oil industries is characterized by elevated levels of chemical oxygen demand (COD), oils, and grease (O&G), which poses significant challenges for treatment to comply with environmental standards. This study aims to assess the effectiveness of continuous flow electrocoagulation in treating such wastewater and optimizing water quality to meet these standards. A response surface methodology (RSM) approach is employed to evaluate the influence of critical operational parameters, including pH, electrode distance, electric current, and reaction time, on the removal efficiencies of COD and O&G. Numerous experiments are conducted under various conditions to identify the optimal configuration. The results revealed that under optimal conditions of pH 3.81, electrode spacing of 1.5 cm, an electric current of 5 A, and a contact time of 51.42 minutes, removal efficiencies of 91.2% for COD and 93.7% for O&G are achieved. Additionally, the maximum processing efficiency is reached during the second operational cycle, where the residual concentrations of COD and O&G are found to be 36.6 mg/L and 14.2 mg/L, resulting in removal efficiencies of 99.26% and 99.25%, respectively. These findings underscore that the proposed optimized electrocoagulation method can attain higher removal efficiencies for COD and O&G than those previously noted in comparable studies. Consequently, this method could be adopted by industries aiming to comply with stringent environmental regulations. Furthermore, the novel combination of operational parameters addresses a significant gap in wastewater treatment research, providing a sustainable solution for industries managing oily contaminants. However, further research may be necessary to evaluate large-scale applications’ longterm operational stability and cost-effectiveness.

11

Removal of microplastics by electrocoagulation

Pilco-Nuñez Alex, Hinostroza-Antonio Edilberto, Diaz-Bravo Pablo, Palacios-Salvador Wendy, Solis-Toledo Richard, Baldeon-Romero Jhanover

Archives of Environmental Protection

|

2024

|

Vol. 50, no. 4

64–-71

EN

With the gradual increase of microplastics in water bodies, it is essential to understand the current treatment processes for their removal. This study aims to investigate the removal of microplastics in synthetic solution by electrocoagulation (EC). The effects of electrode type, contact time (min), agitation speed (rpm) and current density (A/m²) were evaluated using a fractional factorial design. The results showed that the aluminum anode achieved a higher removal of microplastics than the iron anode, reaching 98.04% removal with the aluminum operational configuration within 15 min at 70 rpm and a current density of 20 A/m². A high correlation between the predicted and observed removal was evidenced, with values of R²= 0.99 and adjusted R²= 0.98, indicating a good agreement between the model and the experimental data, confirming the validity and feasibility of the adopted linear model. This study demonstrates that the electrocoagulation process has a great potential for the removal of microplastics.

12

The Treatment of Hospital Wastewater Using Electrocoagulation Process – Analysis by Response Surface Methodology

Salah Al-Shati Ahmed, Alabboodi Khalid O., Shamkhi Hassan A., Abd Zahraa N., Emeen Sara I. Mohammed

Journal of Ecological Engineering

|

2023

|

Vol. 24, nr 1

260--276

EN

Electrocoagulation (EC) can be defined a method utilized to remove pollutants from wastewater by applying an electric current to sacrificial electrodes. Many experimental variables like NaCl content (0–4 g/l), current density (5–25 mA/cm2), time (30–90 mins), and pH (4–10) that influence the removal efficiency regarding COD were considered. In the presented research, three distinct configurations related to electrodes, i.e. Al-Al, Fe-Al, and Fe-Fe, have been utilized to determine which was the most effective. RSM depending on BBD was utilized for optimizing various operational parameters with regard to HWW by use of EC. Maximum COD removal (97.9%) was reached at Fe-Al electrodes, NaCl (3.2 g/l), current density (24.7 mA/cm2), time (81.7 mins), and pH (7.4). COD removal (91.3%) was achieved at the Al-Al electrodes, NaCl (3.8 g/l), current density(23.5 mA/cm2), time-86.3 min, and Ph (7.7). At the Fe-Fe electrodes, the removal of COD (89.5%) was obtained at NaCl (2.3 g/l), current density (24.6 mA/cm2), pH 8.5, and time (86.9 min). This indicates that EC could remove pollutants from different types of wastewaters under many operating parameters and with arrangements of electrodes.

13

Electrochemical Purification of Oil-Containing Shipping Waters

Vozniuk Marta, Shabliy Tetyana, Gomelya Mykola, Sirenko Ludmila, Sidorov Dmytro

Journal of Ecological Engineering

|

2023

|

Vol. 24, nr 7

246--253

EN

The article describes the modern problems of formation and purification of marine oil-containing waters. The efficiency of using electrocoagulation to remove oil from water-oil emulsions of different mineralization using aluminum and iron anodes was studied. Treatment of water-oil solutions with an oil content of 100 mg/dm3 by electrocoagulation in a single-chamber electrolyzer provides 98–99% oil removal using these electrodes at an anode current density of 0.57–2.11 A/dm2 for highly mineralized waters and 0.34 A/dm2 for freshwater treatment during the first 15 minutes provides a reduction in oil concentration from 100 mg/dm3 to values at the level of 1.55–2.93 mg/dm3. When the water treatment time is extended to 45 minutes, greater efficiency in highly mineralized waters is provided by the aluminum anode.

14

Ciprofloxacin Removing from Aqueous Solutions Using Batch Reactor Electrocoagulation Process with Aluminum Electrodes

Majid Raghad, Samaka Isra'a Sadi

Journal of Ecological Engineering

|

2023

|

Vol. 24, nr 9

364--372

EN

Increasing the reliance on pharmaceuticals such as analgesics, antibiotics, antidepressants, and other medications harms the environment and human health. The electrocoagulation process is a modern and crucial technology for treating various pollutants. This paper uses electrocoagulation technology (EC) to remove the most widely used antibiotic, ciprofloxacin (CIP) from an aqueous solution. The proposed approach was experimentally implemented in a batch reactor equipped with (aluminium sheets) that act as electrodes (cathode and anode) arranged vertically in a monopolar parallel mode (MP-P). Different operating parameters were considered, in this work, including inter-electrode distance (IED), pH of the solution, current density (CD), electrolysis time (ET), initial concentration of CIP (Co), and concentration of supporting electrolyte NaCl. Several experiments were performed, and the results revealed that EC has successfully applied with a high removal efficiency of 98.48% under optimum operating conditions: a gap between electrodes = 1 cm, current density = 1.5 mA/cm2, electrolysis time = 60 min, pH = 5, initial CIP concentration = 50 mg/l, and NaCl = 500 mg/l. The experimental results confirmed that the EC process provides a strategy for removing CIP from wastewater with a high removal efficacy and low energy consumption, additionally offering an increased opportunity for using Al-EC cells to treat antibiotic contaminants.

15

Treatment of Municipal Wastewater Using Electrocoagulation Process

Abshishek H., Vijayakumar H., Mahesh Kumar C. L., Shwetha Kotagi Girisha

Civil and Environmental Engineering Reports

|

2023

|

Vol. 33, no. 4

1--13

EN

Treatment of Municipal wastewater by Electrocoagulation (EC) process using punched aluminium and zinc electrodes was studied in a batch EC cell reactor. Response surface methodology (RSM) based on Central Composite Design (CCD) was utilized to optimize the operating parameters for the removal of % Total Suspended Solids (TSS) and % Chemical Oxygen Demand (COD) from Municipal Sewage. Effect of operating parameters such as Electrode Distance (x1), Electrolysis Time (x2) and Voltage (x3) has been optimized for the removal of TSS and COD. The prediction of removal percentage of TSS and COD in various Operational circumstances is done by using Quadratic model. The significance of each operating parameter was computed by Analysis of variance (ANOVA). To achieve the maximum removal of % TSS and % COD, the optimum conditions were Electrode distance(x1)-3 cm, Electrolysis Time (x2)-70.299 minute and Voltage (x3)-6.5V. It was observed that the performance of electrocoagulation process increased up to 61.45% for COD removal, and 73.73% for TSS removal using punched electrode compared to plane electrodes.

16

Treatment of Surface Treatment Effluents by Electrocoagulation Process Using Aluminium Electrodes

Namoussi Soukaina, Merbouh Chaimaa, Kabriti Mohamed, Nahli Abdelmottalib, Naamane Ayoub, Chlaida Mohamed, Iounes Nadia

Journal of Ecological Engineering

|

2022

|

Vol. 23, nr 1

91--99

EN

The surface treatment industry generates effluents with a high load of highly toxic chemicals which must be treated under increasingly stringent regulation. The aim of this study was to treat the effluents of surface treatment unit of an aeronautical industry by the electrocoagulation process using aluminium electrodes. This process is used to study the performance to remove colloidal load, significant amount of oxidizable material and high levels of various metal elements (Cr, Fe, Zn, Cu and Al) from these effluents, under optimum conditions of pH 7, 8.6A of current intensity and 60 min of application. The electrocoagulation process was found to be effective in reducing turbidity (97.12%), COD (97.5%), SS (97.84%) and conductivity (96.82%), hexavalent chromium (99.99%), Zn (96.82%), Cu (94.3%), Iron (99.9%), Al (91.96%). The treated effluent conformed to the Moroccan standards of surface treatment discharge.

17

The Performance of Electrocoagulation Process in Removing Organic and Nitrogenous Compounds from Landfill Leachate in a Three-Compartment Reactor

Bagastyo Arseto Yekti, Sidik Fahrudin, Anggrainy Anita Dwi, Lin Jr-Lin, Nurhayati Ervin

Journal of Ecological Engineering

|

2022

|

Vol. 23, nr 2

235--245

EN

In this study, the effectiveness of the electrocoagulation (EC) process was evaluated based on the reduction of organic and nitrogenous contaminants in landfill leachate. A three-compartment electrochemical reactor as pre-treatment of stabilized landfill leachate was carried out ahead of biological treatment. The removal efficiencies of COD, BOD, ammonia, and nitrate were analyzed at pH 4, 6, and 8 with the current densities of 20.83 and 29.17 mA•cm–2. At pH 4, the highest removal of COD and NH4+ was obtained, i.e., in the range of 72–81% and 43–59%, respectively. The ratio of BOD5/COD was increased after EC, from initially 0.11 to 0.32 at pH 4. In addition, EC effectively removed humic substances in the leachate by targeting a large amount of high molecular weight humic substances, with around 103 kDa. However, the higher removal efficiency observed at higher current density leads to higher specific energy consumption. At a current density of 29.17 mA•cm–2, the specific energy consumption obtained in EC was around 10–17 Wh•g–1 COD and 99–148 Wh•g–1 NH4+. This could be decreased up to 50% at an applied current density of 20.83 mA•cm–2 with slightly lower efficiencies.

18

Physical and numerical model of electrocoagulation process with aluminum electrodes for phosphate removal

Halkijevic Ivan, Loncar Goran, Posavcic Hana, Vouk Drazen

Environment Protection Engineering

|

2022

|

Vol. 48, nr 3

53--68

EN

The efficiency of the electrocoagulation process for the removal of phosphate ions (PO43--P) has been analyzed using a batch full-scale reactor with aluminum electrodes. The effects of the flow rate through the reactor applied current density, and reactor volume were the focus of the study. The initial (PO43--P) concentration was reduced by 90% after 90 min of reactor operation time. Additionally, a three-dimensional numerical model for PO43--P removal via the electrocoagulation process is developed that includes the processes of phosphate adsorption and desorption on coagulated/flocculated particles, along with particles settling. Numerical model parametrization relies on the results from the experiments.

19

Removal of nickel(II) from industrial wastewater using selected methods: a review

Kruszelnicka Izabela, Ginter-Kramarczyk Dobrochna, Góra Wojciech, Staszak Katarzyna, Baraniak Marek, Lota Grzegorz, Regel-Rosocka Magdalena

Chemical and Process Engineering

|

2022

|

Vol. 43, nr 4

437-–448

EN

Due to the increasing problem resulting from environmental pollution with heavy metals, great emphasis is placed on the development of removal methods of these pollutants from the environment. This study presents a literature review on the methods for the removal of nickel ions from aqueous solutions such as sorption, especially using low-cost sorbents which are very popular in 21𝑠𝑡 century, electrochemical processes and membrane techniques. It is often impossible to use a single technique for efficient removal of heavy metals from wastewater as the process depends on many factors, such as wastewater composition, pH, temperature and many others. The aim of this review is to present some selected removal techniques of nickel(II) from wastewater from the point of view of their efficiency and applicability.

20

Study on the utilization of electrocoagulation concept as a disinfectant substitute in hospital wastewater

Fikri Elanda, Djuhriah Nanny, Hanurawaty Neneng Y.

Przegląd Naukowy Inżynieria i Kształtowanie Środowiska

|

2021

|

Vol. 30, No. 2

261--270

EN

The purpose of this study is to identify differences in variations of contact time and number of electrode plates in electrocoagulation process on the decrease of total Coliforms in Bandung City hospital wastewater. An experimental research with factorial randomized design. The volume of wastewater sample to check the total Coliforms was a minimum of 100 ml, using 3 treatments and 6 repetitions. Data analysis used was two-way ANOVA test. The results showed that there was no significant difference between the number of plates (p = 0.269), contact time (p = 0.537), and the number of plates and contact time (p = 0.863) with the total Coliforms in electrocoagulation process. The use of 6 plates and 90 min contact time showed the best results in reducing total Coliforms, with effectiveness reaching 88.38%. This means that the concept is quite effective to use as a substitute for disinfectant.