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Modelling and Identification of Water and Nutrient Balances in Aquaponics.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Modelling and Identification of Water and Nutrient Balances in Aquaponics./
作者:	Lastiri, Daniel Reyes.
出版者:	Ann Arbor : ProQuest Dissertations & Theses, : 2021,
面頁冊數:	156 p.
附註:	Source: Dissertations Abstracts International, Volume: 83-07, Section: B.
Contained By:	Dissertations Abstracts International83-07B.
標題:	Aquaculture. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=28935596
ISBN:	9798762124690

Modelling and Identification of Water and Nutrient Balances in Aquaponics.
Lastiri, Daniel Reyes.

Modelling and Identification of Water and Nutrient Balances in Aquaponics. - Ann Arbor : ProQuest Dissertations & Theses, 2021 - 156 p.

Source: Dissertations Abstracts International, Volume: 83-07, Section: B.

Thesis (Ph.D.)--Wageningen University and Research, 2021.

This item must not be sold to any third party vendors.

This thesis presents the development of mathematical models of water and nutrient balances in aquaponic systems, aimed at improving our understanding of this production method towards an efficient use of resources.Our current food production systems have large social and environmental impacts, which are commonly externalized in the context of industrial production and global trade. Aquaponics is an option for sustainable food production that combines aquatic species (aquaculture) with soilless plants (hydroponics). The main challenge in aquaponics consists of balancing optimal conditions for multiple species: aquatic organisms, plants and beneficial micro-organisms. To facilitate achieving this balance, decoupled aquaponic systems have been proposed, consisting of two separate recirculating water loops. In this way, the production loop for fish operates independently from the production loop for plants, each with their own optimal conditions. Nutrient-rich water from the fish loop can be supplied to the plants continuously or at selected times, reducing fertilizer requirements. Similarly, water from the plants loop can be recovered and supplied to the fish, reducing fresh water demand.Managing water and nutrient exchange in aquaponic systems requires continuous information about the concentrations of chemical elements (nutrients). Some nutrients, like nitrogen and phosphorus, are excreted in abundance by fish and can be used by plants. Other nutrients, like calcium and sodium, are also present in fish water, but they can easily reach harmful levels for plants. Sensors to continuously monitor these concentrations are costly and thus uncommon in commercial applications. Therefore, mathematical models combined with available measurements (semi-physical models), are suitable to support management and control of aquaponic systems.Mathematical models for aquaculture and hydroponic systems are widely available in literature. However, they do not describe the dynamics of nutrients. Furthermore, measurements of nutrients in the components of aquaponic systems are not always available and typically show large uncertainties.In this context, further elaborated in Chapter 1 - General introduction, the objective of this thesis was to investigate the dynamics of water and nutrient balances in decoupled aquaponic systems and their uncertainties. The research questions formulated for this purpose aim at identifying the main challenges and opportunities in closing water and nutrient cycles, and in modelling nutrient balances under uncertainties. Chapters 2 and 3 present system-level studies. Chapters 4 and 5 focus on mathematical modelling under uncertainty, applied to biological production systems.Chapter 2 presents a model-based study coupling a recirculating aquaculture system (RAS) for tilapia with a nutrient film technique (NFT) hydroponic system for tomato. The simulation results show that fish can provide 26% of the nitrogen requirements for plants. Furthermore, it is shown that variations in nitrate concentrations in the fish loop, can be decreased by 35%, using a water management strategy that sends water from fish to plants based on amounts proportional to the fish feed.Chapter 3 presents a model-based study supported by a demonstration aquaponic system in Abtshagen, Germany. The model helped identifying imbalances in the system design. It predicted excess concentrations of total suspended solids (TSS) for fish, and excess sodium, calcium, magnesium, and ammonium for plants.

ISBN: 9798762124690Subjects--Topical Terms:

545878
Aquaculture.

Modelling and Identification of Water and Nutrient Balances in Aquaponics.
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