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Digitally manufactured air plasma-on-water reactor for nitrate production

Journal Article · · Plasma Sources Science and Technology

The sustainable production of food to support the increasing world population is one of humanity’s most pressing challenges. Plasma activated water, produced using renewable energy, can help fulfill plants’ needs in sustainable agriculture approaches. The design, implementation, and characterization of a digitally manufactured air plasma-on-water reactor (POWR) for the synthesis of nitrate as green nitrogen fertilizer is presented. The interaction of air plasma-generated reactive oxygen and nitrogen species with water produces nitrate (NO3-) and related species, which are the main nitrogen-containing nutrients for plants. The mild conditions of the operation of the POWR opens the possibility to use plastics, particularly through digital manufacturing strategies such as 3D-printing, for its fabrication. A pin-to-plate reactor configuration powered by high-voltage alternating power is chosen due to its simplicity and efficacy. A computational thermal-fluid model is used to evaluate the design and attain expected operational characteristics. The experimental characterization of the POWR encompassed design and operation parameters, namely electrode-water spacing, air flow rate, and voltage level. A machine learning approach is implemented to extract and quantify characteristic features of the plasma–water interaction, such plasma volume and plasma–water interface area. Experimental results revealed that the nitrate production rate varies linearly with dimensionless plasma volume. The design, fabrication, and characterization methods presented can be adapted to other POWRs and help enable on-demand nitrogen fertilizer production at low environmental and economic cost.

Research Organization:
Univ. of Massachusetts, Amherst, MA (United States)
Sponsoring Organization:
USDOE Office of Science (SC)
DOE Contract Number:
SC0018230
OSTI ID:
1979314
Journal Information:
Plasma Sources Science and Technology, Vol. 31, Issue 3; ISSN 0963-0252
Publisher:
IOP Publishing
Country of Publication:
United States
Language:
English

References (30)

Electrical and spectroscopic characterization of underwater plasma discharge inside rising gas bubbles journal May 2012
Primary chemical reactions in pulsed electrical discharge channels in water journal November 2007
Why Beirut’s ammonium nitrate blast was so devastating journal August 2020
Physics on plasma chemistry journal July 1979
Applied Plasma Medicine journal August 2008
The Gaseous Electronics Conference RF Reference Cell - An Introduction journal July 1995
Post-discharge evolution of reactive species in the water activated by a surface air plasma: a modeling study journal April 2018
Gas and heat dynamics of a micro-scaled atmospheric pressure plasma reference jet journal October 2015
Recent Progress of Plasma-Assisted Nitrogen Fixation Research: A Review journal December 2018
Low-Temperature Plasma-Assisted Nitrogen Fixation for Corn Plant Growth and Development journal May 2021
Plasma Activated Organic Fertilizer journal November 2018
Reactive nitrogen species produced in water by non-equilibrium plasma increase plant growth rate and nutritional yield journal March 2013
Mutual Interaction between Plasma Characteristics and Liquid Properties in AC-driven Pin-to-Liquid Discharge journal August 2018
Long-term antibacterial efficacy of air plasma-activated water journal November 2011
Reducing energy cost of NO production in air plasmas journal April 2019
Nitrate and nitrite fertilizer production from air and water by continuous flow liquid-phase plasma discharge journal April 2021
Physicochemical mechanisms of plasma-liquid interactions within plasma channels in liquid journal September 2015
Controlling: the composition of plasma-activated water by Cu ions journal April 2021
Biological Nitrogen Fixation in the Context of Global Change journal May 2013
The effect of non-thermal plasma treatment on wheat germination and early growth journal May 2015
Evidence of near-the-limit energy cost NO formation in atmospheric spark discharge journal August 2021
Non-thermal plasmas in and in contact with liquids journal February 2009
Optimization of a novel liquid-phase plasma discharge process for continuous production of biodiesel journal August 2019
Non-Thermal Plasma Treatment of Agricultural Seeds for Stimulation of Germination, Removal of Surface Contamination and Other Benefits: A Review: Non-Thermal Plasma Treatment of Agricultural Seeds… journal June 2015
Plasma-based water treatment: Conception and application of a new general principle for reactor design journal August 2015
Plasma activated water (PAW): Chemistry, physico-chemical properties, applications in food and agriculture journal July 2018
Recent developments in cold plasma decontamination technology in the food industry journal October 2018
Eco-efficiency analysis of plasma-assisted nitrogen fixation journal April 2020
Self-organization in 1 atm DC glows with liquid anodes: current understanding and potential applications journal March 2020
Subject independent facial expression recognition with robust face detection using a convolutional neural network journal June 2003