12 results found
Cherukupally P, Sun W, Wong APY, et al., 2020, Surface-engineered sponges for recovery of crude oil microdroplets from wastewater (vol 321, pg 784, 2019 ), NATURE SUSTAINABILITY, Vol: 3, Pages: 161-161, ISSN: 2398-9629
Abidli A, Huang Y, Cherukupally P, et al., 2020, Novel separator skimmer for oil spill cleanup and oily wastewater treatment: From conceptual system design to the first pilot-scale prototype development, Environmental Technology & Innovation, Pages: 100598-100598, ISSN: 2352-1864
Cherukupally P, Sun W, Wong APY, et al., 2019, Surface-engineered sponges for recovery of crude oil microdroplets from wastewater, Nature Sustainability, ISSN: 2398-9629
In the United States, the oil industry produces over 15 billion barrels of wastewater contaminated with crude oil microdroplets annually. Current methods are ineffective for the removal of these microdroplets at the variable pH conditions commonly found in wastewater. Here, an innovative surface-engineered sponge (SEnS) that synergistically combines surface chemistry, charge and roughness, provides a solution to this problem. Over broad pH conditions, the SEnS rapidly adsorbed oil microdroplets with 95–99% removal efficiency, predominantly facilitated by Lifshitz–van der Waals forces. At the optimum pH, 92% of the oil was adsorbed within 10 min. The oil was subsequently recovered by solvent extraction under ambient conditions, and the cleaned SEnS was reused for oil microdroplets adsorption ten times. The combined efficacy and reusability can enable large-scale removal and recovery of crude oil microdroplets from wastewater.
Cherukupally P, Fiddes L, Park C, et al., 2019, Open cell foams - An emerging, low-cost bacteria adhesive surface for energy and environmental applications
© 2019 Society of Plastics Engineers. All rights reserved. Bacteria adhesive surfaces (BAS) have diverse applications, such as water treatment, biofuels, and solvents production. However, currently their large-scale usage is hindered by high materials cost. Inexpensive open-cell foams can potentially serve as substrates for low-cost BAS, enabling their wider usage. This work demonstrates a passive approach for attachment of Escherichia coli or E. coli to a polyester polyurethane open-cell foam surface using pH of the wastewater. The foam's ionic-responsive charge property was used to bind negatively charged bacteria to its pore surface at different pH conditions. At the best pH condition, the foam adsorbed E. coli with over 99% efficiency. The pH-driven bacteria adhesion to foam surface is simple, effective, and passive, therefore has potential for industrial-scale applications.
Cherukupally P, Li B, Williams D, et al., 2018, Mining value from oil sands tailings ponds
© 2018 Society of Plastics Engineers. All rights reserved. Regeneration Methods: 1. Mechanical Compression 2. pH-Swing method 3. Chemical wash method. Findings: Simple and environmental friendly Effective for absorbed oil recovery Ineffective for adhered oil recovery New technique of oil recovery Effective for 2 cycles only but in 3rd cycle the efficiency dropped to ~70% Advanced exploratory work required New technique of oil recovery Effective for all cycles and materials are reusable Advanced formulation of solvents required to improve environmental benefits.
Cherukupally P, Williams D, Bilton A, et al., 2018, Mining the value from oil sands tailings ponds: Addressing the energy, environmental, and economic challenges of oil sands industry
© 2018 Society of Plastics Engineers. All rights reserved. In the US, over 7 billion gallons of the contaminated water generated each day by steam-based oil extraction processes. One of the biggest challenges in treating these effluents is the removal of crude oil droplets due to its high temperature and salinity. Current materials, membranes and adsorbents are ineffective due to fouling, thermal instability, or slow response. Alternatively, sponges have high thermally stable and adsorb oil droplets effectively. This research focuses on the fundamental properties required for usage of sponges as filter separation media. The oil field effluents are enriched with both positive and negative ions due to its high salt concentration. Thus, the oil droplets and the acid-base polymers attract ions of opposite charge. This phenomenon results in attraction between the droplets and the sponges. In this work, an acid-base surface engineered sponge (SEnS) was evaluated for its thermal stability and surface charge properties to show its potential as a practical adsorbent. The SEnS effectively adsorbed the crude oil droplets under various salt concentrations. As the salt concentration increased, the time of removal dramatically declined, resulting in over 99% of oil removal within 5 minutes. Furthermore, the sponge was regenerated and reused multiple times for oil adsorption. Also, in the regeneration process, the crude oil was recovered from the mixture. In conclusion, the SEnS was shown to be effective and reusable, resulting in recovered crude oil. Thus, the SEnS filter has the great potential to be disruptive in remediation of oil field effluents and generate value from otherwise unusable waste.
Cherukupally P, Acosta EJ, Hinestroza J, et al., 2017, Acid-Base Polymeric Foams for the Adsorption of Micro-oil Droplets from Industrial Effluents, Environmental Science and Technology (Washington), ISSN: 1520-5851
Cherukupally P, Hinestroza JH, Farnood R, et al., 2017, Adsorption Mechanisms of Emulsified Crude Oil Droplets onto Hydrophilic Open-Cell Polymer Foams, 32nd International Conference of the Polymer-Processing-Society (PPS), Publisher: AMER INST PHYSICS, ISSN: 0094-243X
Cherukupally P, Bilton AM, Park CB, 2017, Cellular polymers for oil/water mixtures separation - Evaluation of process conditions, Pages: 2420-2424
This study investigates the usage of cellular polymers for large scale oil/water separation. The model polyester polyurethane foam was characterized for sustainability and oil adsorption efficacy in a batch system. The temporal mass uptake and its efficacy were experimentally optimized at various temperatures and stirring speeds. With favorable surface, morphology, and bulk properties in conjunction with process conditions, and a mass uptake of 21 g/g of foam, this polymer lends itself as a very promising material for oil adsorption.
Cherukupally P, Bilton A, Hinestroza J, et al., 2017, Micro organic pollutants removal using a foam filter through rationally selected hydrophilic media, Pages: 2493-2496
Here, we present an interesting and new application of cellular foams to separate stable oil/water emulsions for large scale water treatment. The hydrophilic polyester polyurethane foam with large pores measuring hundreds of microns can effectively adsorb micro-oil droplets from stable oil/water emulsions. The foam, when configured in a flow-through filter, operates at low pressure, low mass transfer resistance, and high flow rate. The cellular polymers are promising new class of filtration media for practical oil/water separation that minimize the use of coagulants, are cost effective, and are energy efficient. The foam-based filtration technology has the potential to be a game changer in advanced water treatment.
Cherukupally P, Chu RKM, Bilton A, et al., 2016, Oil Diffusion Properties of Acoustic Foams for Oil Contaminated Water Treatment, Regional Conference of the Polymer-Processing-Society (PPS), Publisher: AMER INST PHYSICS, ISSN: 0094-243X
Esmaeelpanah J, Cherukupally P, Chandra S, et al., 2016, NUMERICAL AND EXPERIMENTAL INVESTIGATION OF BUBBLE ATTACHMENT TO A SUBSTRATE, First Thermal and Fluids Engineering Summer Conference, Publisher: Begellhouse
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