Degradation of root exudates in closed hydroponic systems using UV/H2O2: Kinetic investigation, reaction pathways and cost analysis

Hosseinzadeh, Seyedahmad; Testai, Dario; BKheet, Mona; Graeve, Jasmien De; Roccaro, Paolo; Hulle, Stijn Van

doi:10.1016/j.scitotenv.2019.05.477

Cited by 14 publications

(9 citation statements)

References 30 publications

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“…Phytotoxic effects have been observed in H 2 O 2 concentrations ranging from 8 mg L −1 for lettuce to 125 mg L −1 for cucumber cultivation. As there is a wide range of phytotoxic effects based on cultivated plants, suggestions have been made to apply H 2 O 2 to source water in combination with conventional mineral fertilizers [23]. At the same time, our research has shown that microbial reduction takes place when H 2 O 2 is applied to organicbased NSLs and, for this reason, should not only be considered for the disinfection of source water but also for prepared nutrient solutions.…”

Section: Discussionmentioning

confidence: 81%

“…In addition, organic residues in bioponic systems might not only cause the risk of pathogens in the cultivation but also increase root exudates as a reaction to adjust the nutrient uptake around the root. Hosseinsadeh et al (2019) showed that an H 2 O 2 application of approximately 200 mg L −1 led to the best results in removing root exudates, thus improving the growth environment for the plant [23]. This indicates that the presence and application of H 2 O 2 as a disinfectant for the BNSL not only reduces microbial concentrations but also reduces plant exudates and thus improves plant health and growth.…”

Section: Discussionmentioning

confidence: 99%

“…Hence, in order to prevent microbial overpopulation, which can negatively affect plant growth and cause the growth of harmful pathogens, disinfection is necessary. Several methods have previously been described, though mostly in a hydroponic and not in a bioponic approach [23]. Non-chemical disinfection of nutrient solutions can be achieved through heat treatment, filtration, oxidation, or the most common method through UV disinfection.…”

Section: Introductionmentioning

confidence: 99%

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Electrochemical In Situ Hydrogen Peroxide Production Can Reduce Microbial Load in Bioponic Nutrient Solutions Derived from Organic Waste

Kriem,

Pietzka,

Beckett

et al. 2023

Agriculture

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Technological advancement in recent decades has allowed for crop cultivation in soilless controlled environments, known as hydroponics, and this is being employed in an increasing number of factories worldwide. With continued local and regional disruptions in the supply chain to provide mineral fertilizers, new pathways to generate nutrient solutions are being developed. One potential approach is the recovery of nutrients from organic waste and wastewater using bioponics. Bioponics refers to the biological mineralization of organic residues through processes such as anaerobic and aerobic digestion and the use of such organically produced nutrient solutions in hydroponic systems. However, without disinfection of the nutrient solution, the high microbial loads increase the risk of pathogens affecting plant and consumer health. In this work, electrochemical hydrogen peroxide (H2O2) demonstrated success in reducing microbial loads. Different scenarios of application were considered: (1) variation in the H2O2 concentration in the nutrient solution by dosing H2O2 from ex situ electrochemical production, (2) variation in the dosing time-dependent reaction between the nutrient solution and H2O2 produced ex situ, and (3) the in situ production of H2O2 of the organic nutrient solution. The highest tested H2O2 concentration of 200 mg L−1 showed a microbial load reduction of bacteria at 93.3% and of fungi at 81.2%. However, the in situ production showed the highest reduction rate for bacteria and fungi in bioponic nutrient solutions, where longer reaction times also impact microbial concentrations in situ. Final microbial reductions of 97.8% for bacteria and of 99.1% for fungi were determined after a H2O2 production time of 60 min. Overall, our results show that electrochemical H2O2 production can be used to disinfect bioponic nutrient solutions, and the production cell can be implemented in bioponic systems in situ.

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Section: Discussionmentioning

confidence: 81%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Electrochemical In Situ Hydrogen Peroxide Production Can Reduce Microbial Load in Bioponic Nutrient Solutions Derived from Organic Waste

Kriem,

Pietzka,

Beckett

et al. 2023

Agriculture

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“…6. In a recent study, it was found that the degradation of benzoic, phthalic and succinic acids present in a reused nutrient solution could be achieved through UV/H 2 O 2 application and the amount of benzoic acid removed increased from 83% to 91% when increasing the contact time from 90 min to 270 min in the presence of 50 mg•L −1 H 2 O 2 and with UV application (Hosseinzadeh et al, 2019).…”

Section: Addition Of Electro-degradation and Uv/h 2 O 2 To The Nutriementioning

confidence: 99%

Autotoxicity in Strawberry Under Recycled Hydroponics and Its Mitigation Methods

Asaduzzaman

Asao

2020

Hort. J.

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Strawberry plants are grown in hydroponics for higher quality and yield, as this system excludes soil-borne disease issues. Recycled hydroponics is practiced to make cultivation cost-effective, sustainable, and environmentally friendly. However, due to recycling of hydroponic nutrient solution, plant root exudates accumulate, leading to autotoxicity, a form of allelopathy that inhibits growth and development. In recent decades, commercial cultivation of strawberry under greenhouse and plant factory conditions following recycled hydroponics has been widely adopted globally. Subsequently, yield decline has also been reported due to development of autotoxicity from the accumulated root exudates. In recycled hydroponic systems, strawberry plant growth is inhibited by root exudates that contain mainly phenolic acids in the culture solution. In this regard, elimination of these accumulated root exudates or allelochemicals from the culture solution would restore inhibited plant growth and yield. A number of research studies have been conducted on autotoxicity in strawberry and possible mitigation methods. These studies suggested that addition of activated charcoal in the nutrient solution, supplementation of auxin on leaves, electro-degradation of root exudates in nutrient solution, and supplementation of amino acids and/or LEDs can effectively remove/degrade/mitigate autotoxicity in strawberry grown under recycling hydroponics. This review mainly discusses the autotoxicity phenomenon in strawberry under recycled hydroponics, the responsible allelochemicals and their mechanism of action, mitigation methods and future research endeavors in this field.

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“…Fine sand is often used because it is easy to obtain and inexpensive, but less able to retain water and there are no nutrients in it. The medium used is a mixture of rice husk and sawdust or coconut coir dust (Hosseinzadeh et al, 2019;Kitaya et al, 2001;Klass, 1998).…”

Section: Some Of the Ingredients Are In Needmentioning

confidence: 99%

Chemical contents of hydroponic plants

Steven¹

2019

IJCMS

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The world is increasingly sophisticated with technologies that help humans in the move, even in terms of compliance with food, but it is still in line with the development of technology that is the growing amount of human birth, so the lack of area for fulfillment in terms of planting of food crops, but the land is mostly reserved residential land, and even more we see this village, which is clearing land to grow crops other than basic foodstuffs, but only to enrich themselves. How do we as human beings who still want to meet the food needs facing arable land diminishing modern era is farming no longer have to use the soil of various methods of planting can be used for those who want to pursue her, one of which is farming hydroponic, hydroponics itself is a means farming without soil media when faced with the problems faced in the world in terms of food production, hydroponic gardening system offers a promising solution. In poor countries where soil or climate inhospitable to agriculture, hydroponics offers a means to grow crops with ease. also in areas where the soil has lost its nutrients or fertile land is hard to come by, hydroponics can be an ideal alternative to farming.

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Degradation of root exudates in closed hydroponic systems using UV/H2O2: Kinetic investigation, reaction pathways and cost analysis

Cited by 14 publications

References 30 publications

Electrochemical In Situ Hydrogen Peroxide Production Can Reduce Microbial Load in Bioponic Nutrient Solutions Derived from Organic Waste

Electrochemical In Situ Hydrogen Peroxide Production Can Reduce Microbial Load in Bioponic Nutrient Solutions Derived from Organic Waste

Autotoxicity in Strawberry Under Recycled Hydroponics and Its Mitigation Methods

Chemical contents of hydroponic plants

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