- 04 December, 2024
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| Designation: |
Principal Scientist
|
| Email Id: | pv_nidheesh[at]neeri[dot]res[dot]in |
| Qualification: |
M.Tech(Env.Engg),B.Tech(Civil Engg.), Ph.D |
| Specialization: |
Wastewater Treatment using Advanced Oxidation Processes
|
| Address: |
Sub-Verticals 4A : Environmental Impact Assessment, NEERI, Nagpur
|
| Biodata: |
| Sr. No. | Publication Name |
|---|---|
| 1 |
Environmental Applications of Boron-Doped Diamond Electrodes: 1. Applications in Water and Wastewater Treatment
Over the past few decades, environmental applications of the boron-doped diamond (BDD) electrode are reported to be vast and versatile. Applications of BDD electrodes in the field of electrochemical advanced oxidation prodesses (EAOPs) for the abatement of toxic persistent organic pollutants are significant owing to the easy and effective way of treatment This article focuses on highlighting and summarizing the applications of the BDD electrode for the treatment of different synthetic and real wastewaters , such as those involved in pharmaceuticals and personal care products, pesticides/herbicides, dyes, etc. We also review the processes and methodologies involving the synthesis of BDD electrodes and summarize the desirable characteristic features required for the application of EAOPs. |
| 2 |
Environmental Applications of Boron-Doped Diamond Electrodes: 2. Soil Remediation and Sensing Applications
|
| 3 |
Performance of Natural Coagulant Extracted from Plantagoovata Seed for the Treatment of Turbid Water
Abstract Present study investigates the coagulation ability of Plantago ovata (P. ovata)seedextracts for turbidity removal. The active coagulant agents were successfully extracted from P. ovata seeds using different solvents such as distilled water (PO-DW), tap water (PO-TW), NaCl (PO-NaCl), and ammonium acetate (PO-AA). Experiments were conducted in batch mode for initial turbidity such as 500 NTU (high), 150 NTU (medium), and 50 NTU (low). Results demonstrated that P. ovata extracts are less efficient in low turbidities, while PO-NaCl was found to provide high coagulation activity in all initial turbidity concentrations compared to other extracts. PO-NaCl was able to remove 98.2, 94.9, and 80.2% of turbidity from water having in initial turbidities of 500, 150, and 50 NTU, respectively. Coagulation activity of the extract was the best when the extraction was performed for 50 min at room temperature. Jar test procedure with the coagulation time of 1 min and flocculation time of 30 min was optimized, irrespective of the initial turbidity. The optimum settling time for 500, 150, and 50 NTU water samples were 20, 30, and 90 min, respectively. PO-NaCl was used in different pH turbid solutions and it was found to be working very efficiently in alkaline conditions. The coagulation efficiency of the coagulant stored in refrigerator was higher than that stored at room temperature. Thus, the natural coagulants extracted from P. ovata seeds revealed to be effective for turbidity removal. |
| 4 |
Arsenic removal by electrocoagulation process: Recent trends and removal mechanism
Arsenic contamination in drinking water is a major issue in the present world. Arsenicosis is the disease caused by the regular consumption of arsenic contaminated water, even at a lesser contaminated level. The number of arsenicosis patients is increasing day-by-day. Decontamination of arsenic from the water medium is the only one way to regulate this and the arsenic removal can be ful?lled by water treatment methods based on separation techniques. Electrocoagulation (EC) process is a promising technology for the effective removal of arsenic from aqueous solution. The present review article analyzes the performance of the EC process for arsenic removal. Electrocoagulation using various sacricial metal anodes such as aluminium, iron, magnesium, etc. is found to be very effective for arsenic decontamination. The performances of each anode are described in detail. A special focus has been made on the mechanism behind the arsenite and arsenate removal by EC process. Main trends in the disposal methods of sludge containing arsenic are also included. Comparison of arsenic decontamination ef?ciencies of chemical coagulation and EC is also reported. |
| 5 |
Review of zero-valent aluminium based water and wastewater treatment methods
Zero-valent metals (ZVM) are widely used to remove heavy metals, contaminants, toxicity, etc. from water and wastewater. Zero-valent aluminium (ZVAl) has large surface area and high surface reactivity. It has enormous ?exibility for the in-situ application. ZVAl can be applied as either a single or a bimetallic system as well as advanced oxidation processes (AOPs). It is observed that ZVAl is capable of generating hydroxyl and sulfate radicals in water medium, which remove non-biodegradable pollutants from aqueous solution. ZVAl-based processes can remove non-biodegradable organic contaminants from water mediumwithin a short duration. ZVAl is also used as a reducing agent. It is eficient to reduce toxic hexavalent chromium to less toxic trivalent chromium. ZVAl, in various combinations in bimetallic system (Fe/Al, Pd/Al, Cu/Al), is able to remove various contaminants from aqueous medium. Overall, it can be concluded that ZVAl-based methods for water and wastewater treatment are promising environmental technologies. |
| 6 |
Graphene based materials supported advanced oxidation processes for water and wastewater treatment: A review
Abstract Advanced oxidation processes (AOPs) received much attention in the field of water and wastewater treatment due to its ability to mineralize persistent organic pollutants from water medium. The addition of graphene-based materials increased the efficiency of all AOPs significantly. The present review analyzes the performance of graphene-based materials that supported AOPs in detail. Recent developments in this field are highlighted. A special focus has been awarded for the performance enhancement mechanism of AOPs in the presence of graphene-based materials. |
| 7 |
Combined electro-Fenton and biological processes for the treatment of industrial textile effluent: Mineralization and toxicity analysis
Abstract: The longer time required for complete mineralization in the electro-Fenton (EF) process can be rectified by combining the EF process with a biological method. This paper analyzes textile wastewater treatment by ntegrating EF and biological processes. The removal of color, chemical oxygen demand (COD), and total organic carbon (TOC) by the EF process was 63, 48, and 29% respectively. Further treatment of this wastewater by a biological process resulted in removal of 85% of color, 86% of COD, and 56% of TOC. In addition, better mineralization of dyes requires integration of aerobic and microaerophilic conditions. The phytotoxicity and microbial toxicity analysis of the treated wastewater shows that there is a significant reduction of toxicity compared with the raw wastewater. Therefore it is recommended that the combined EF and biological degradation processes be applied in the treatment of textile wastewater for removing color, COD, and TOC effectively. |
| 8 |
Removal of chromium and iron from real textile wastewater by sorption on soils
Abstract: Discharge of textile effluents creates serious environmental problems. This paper investigates the ability of various natural and modified soils to remove heavy metals present in the textile wastewater. Natural soils such as kaolinite, bentonite, and laterite, along with modified soils such as organoclay and biopolymer-amended laterite are considered as the potential adsorbents. Iron and chromium present in the textile wastewater are considered as model pollutants. Batch adsorption studies are carried out to determine the heavy metals sorption capacity of soils. The heavy metals removal efficiency of soils follows the order bentonite > biopolymer amended laterite soil > laterite soil > kaolinite > organoclay. Almost complete removal of heavy metals is observed with bentonite and biopolymer-amended laterite. Therefore soil is determined to be a cost-effective and efficient adsorbent for the removal of heavy metals from textile wastes. |
| 9 |
Combined heterogeneous Electro-Fenton and biological process for the treatment of stabilized landfill leachate
Treatment of stabilized land all leachate is a great challenge due to its poor biodegradability. Present study made an attempt to treat this wastewater by combining electro-Fenton (E-Fenton) and biological process. E-Fenton treatment was applied prior to biological process to enhance the biodegradability of leachate, which will be bene?cial for the subsequent biological process. This study also investigates the ef?ciency of iron molybdophosphate (FeMoPO) nanoparticles as a heterogeneous catalyst in E-Fenton process. The effects of initial pH, catalyst dosage, applied voltage and electrode spacing on Chemical Oxygen Demand (COD) removal ef?ciency were analyzed to determine the optimum conditions. Heterogeneous E-Fenton process gave 82% COD removal at pH 2, catalyst dosage of 50 mg/L, voltage 5 V, electrode spacing 3 cm and electrode area 25 cm 2 . Combined E-Fenton and biological treatment resulted an overall COD removal of 97%, bringing down the ?nal COD to 192 mg/L. |
| 10 |
Removal of Rhodamine B dye from aqueous solution by electro-Fenton process using iron-doped mesoporous silica as a heterogeneous catalyst
In the current study, Rhodamine B (RhB) dye was removed by electro-Fenton (EF) process using iron-doped SBA-15 (Fe-SBA-15; SBA: Santa Barbara Amorphous) mesoporous silica as a heterogeneous catalyst. This catalyst was prepared with the help of ferric nitrate nonahydrate as a forerunner by wet impregnation method. Various techniques of characterization such as FTIR studies, XRD, SEM and N2 adsorption-desorption isotherms were performed to confirm the presence of iron particles in the pores of the catalyst. These characterization methods were also used to examine the morphological properties and textural arrangement of the synthesized material. In the batch study of EF process, 750 mL working volume of RhB dye was taken. Anode and cathode used in the process were graphite electrodes respectively with effective area of 25 cm2 each. To maximise the process efficiency, the effect of initial pH, applied voltage, electrode spacing, the concentration of supporting electrolyte and Fe-SBA-15 dosage were investigated and optimized. The optimum conditions obtained were pH of 2, voltage of 8 V, an electrode spacing of 3 cm and Fe-SBA-15 dosage of 15 mg L-1 . At the end of 3 h electrolysis, maximum RhB removal of 97.7% and TOC removal of 35.1% were achieved for 10 mg L-1 RhB concentration. In a batch study with real wastewater, 97% of color and 39% of TOC were removed at optimum conditions. Utilization of EF heterogeneous catalyst Fe-SBA-15 is an alternative technique for the elimination of dyes from solution. |
| 11 |
Composite Wastewater Treatment by Aerated Electrocoagulation and Modified Peroxi-coagulation Processes
Treatment of composite wastewater generating from the industrial estates is a great challenge. The present study examines the applicability of aerated electrocoagulation and modified peroxi-coagulation processes for removing color and COD from composite wastewater. Iron plates were used as anodes and cathodes in both electrochemical processes and experiments were carried out in a working volume of 2 L. Aeration enhanced the efficiency of electrocoagulation process significantly. More than 50% of COD and 60% of color were removed after 1 h of electrocoagulation process operated at pH 3 and applied voltage of 1 V. Eficiency of the modified peroxi-coagulation process was significantly higher than that of aerated electrocoagulation. COD and color removal efficiencies of the modified peroxi-coagulation process were found as 77.7% and 97%, respectively after 1 h of electrolysis operated at 1 V, solution pH 3 and 50 mM hydrogen peroxide addition. This improved eficiency of modified peroxi-coagulation compared to aerated electrocoagulation is mainly due to the attack of in-situ generated hydroxyl radicals. |
| 12 |
Iron impregnated biochars as heterogeneous Fenton catalyst for the degradation of acid red 1 dye
In the present work, Acid Red 1 (AR1) dye degradation by two heterogeneous Fenton catalysts, namely iron loaded rice husk biochar (Fe-RHB) and coir pith biochar (Fe-CPB) are studied. Biochar prepared from RHB and CPB were sonicated in the presence of ferric nitrate for the synthesis of Fe-RHB and Fe-CPB by incipient impregnation ethod. E?ect of operational parameters such as pH, the dosage of catalyst, H2O2 concentration and temperature were examined. Characterization of the synthesized Fenton catalyst, Fe-RHB and Fe-CPB were analysed by SEM, EDS, XRD and XPS techniques. In Fe-RHB Fenton system, maximum dye removal e?ciency of 97.6% and TOC removal e?ciency of 84.2% were obtained at pH 3 for 50 mg L-1 of AR1 concentration, with 16 mM of H2O2 and 5 g L-1 of catalyst dosage within 120 min reaction time. Similarly, for Fe-CPB, maximum dye removal e?ciency of 99.1% and TOC removal e?ciency of 86.7% were obtained with 16 mM of H2O2 and 4gL-1 of dosage for 50 mg L-1 of initial dye concentration at pH 3. The prepared catalysts can be reused for successive cycles as the catalyst materials are highly stable and have very less iron leaching property. |
| Sr. No. | Achievement / Award | Awarded By |
|---|---|---|
| 1 |
Early Career Research
|
Science and Engineering Research Board (SERB) |
| 2 |
M.Tech. Environmental Engineering Gold Medalis
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- |
| 3 |
"Outstanding Reviewer 2016" of Journal of Environmental Chemical Engineering, Elsevier Publication
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- |
| 4 |
"Outstanding Reviewer 2017" Chemosphere, Elsevier Publication
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- |
| 5 |
"Outstanding Reviewer 2017" Chemical Engineering Journal, Elsevier Publication
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- |
| 6 |
"Outstanding Reviewer 2017" Journal of Molecular Liquids, Elsevier Publication
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- |
| 7 |
"Outstanding Reviewer 2017" Journal of Industrial and Engineering Chemistry, Elsevier Publication
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- |
| 8 |
"Outstanding Reviewer 2017" Journal of CO2 Utilization, Elsevier Publication
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- |
| 9 |
"Outstanding Reviewer 2017" Journal of Institute of Taiwan Chemical Engineers, Elsevier Publication
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- |
| 10 |
"Outstanding Reviewer 2018" Separation and Purification Technology, Elsevier Publication
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- |
| 11 |
Editorial Board Member of International Journal of Emerging Technology and Advanced Engineering
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| 12 |
Best paper award for the article "Graphite-Graphite Electro Fenton Process for Dye Removal: Advantages, Implementation Problems and Remedial Solutions"
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View Biodata [0.31 MB]