Onsite anaerobic treatment of aquaponics lettuce waste: digestion efficiency and nutrient recovery

Zhu, Ze Sheng; Yogev, Uri; Keesman, Karel J.; Gross, Amit

doi:10.1007/s10499-020-00609-x

Cited by 10 publications

(3 citation statements)

References 46 publications

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“…In decoupled systems, recovering sludges to produce biogas by bio-digestion is a promising alternative. According to Zhu et al (2021) [40], the effective digestion of the sludge from fish wastewater can produce biogas composed of ≈59% methane, ≈39% CO 2 , and a fraction of hydrogen sulfide.…”

Section: Aquaponics Can Contribute Significantly To Achieving the Sus...mentioning

confidence: 99%

Can Aquaponics Be Utilized to Reach Zero Hunger at a Local Level?

Flores-Aguilar,

Sánchez-Velázquez,

Aguirre-Becerra

et al. 2024

Sustainability

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Meeting the demand for food through sustainable agro-industrial systems has become a concern due to the current state of the planet’s natural resources, population growth, and climate change. To address this, the 2030 Agenda has laid out several strategies to enhance human well-being and protect the planet. This paper focuses on Goal 2, which aims to end hunger, achieve food security, improve nutrition, and promote sustainable agriculture. The first three targets of this goal are as follows: 2.1, ending hunger and ensuring access to nutritious food; 2.2, ending all forms of malnutrition; and 2.3, doubling the agricultural productivity of small-scale food producers. The purpose of this manuscript is to demonstrate how aquaponics can positively impact these three targets by guaranteeing food security through the production of high-quality protein. Aquaponic crops are enriched with organic nutrients from the water they grow in. This not only increases their nutrient content but also their bioactive molecule content, making them excellent for fighting hunger and malnutrition. Moreover, these practices can be adjusted to different scales, making them a viable option for small farmers, women, and rural communities to produce their own food. Consequently, aquaponics can play a crucial role in achieving Zero Hunger locally, with appropriate support.

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Section: Aquaponics Can Contribute Significantly To Achieving the Sus...mentioning

confidence: 99%

Can Aquaponics Be Utilized to Reach Zero Hunger at a Local Level?

Flores-Aguilar,

Sánchez-Velázquez,

Aguirre-Becerra

et al. 2024

Sustainability

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“…While elemental metals can oxidise in a wastewater environment, the time scale of elemental metal is generally too slow to have a significant impact on wastewater process models except where the metal is deliberately oxidised via electrochemistry (e.g., in electrocoagulation (Moussa et al, 2017)). Therefore, the key elements to consider are those which are found in wastewater (or added as oxidant/reductant), and oxidise/ reduce between the oxidation reduction potential (ORP) range of +400 mV found in aerated tanks and the −500 mV found in anaerobic digesters (Li & Bishop, 2001;Zhu et al, 2021). It is noted that chlorination disinfection systems and oxidation (ozone, advanced oxidation) can reach the 1 V+ range, where additional considerations may be needed (particularly where reduced metals are a significant sink of the oxidant).…”

Section: Conclusion and Recommendationsmentioning

confidence: 99%

Generalised Physicochemical Model (PCM) for Wastewater Processes

2022

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This book describes theory and approach for a comprehensive and applied physicochemical model for wastewater treatment. These are reactions which occur without a biological mediator, and are critical to both the biology of wastewater treatment, and stand-alone chemical treatment units. The book includes description of acid-base theory, solution ion pairing and non-ideality, participation with other phases, and chemical oxidation/reduction. Full implementation details are provided, including in a plant wide modelling context, and with respect to required extensions to biological models to describe more complex aspects of the iron-sulfur-phosphorous system, which requires all components of the model to be properly described. ISBN: 9781780409825 (Paperback) ISBN: 9781780409832 (eBook) ISBN: 9781780409849 (ePub)

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“…A promising future variant of aquaculture is the combination with horticultural production, called aquaponics (Palm et al, 2024). Residual material streams from aquaculture and plant production, such as aquaponics or stand-alone nearby greenhouse crop production, might offer promising energy potential for co-digestion (Zhu et al, 2021).…”

Section: Introductionmentioning

confidence: 99%

Enhancing energy recovery from aquaculture residual materials: a focus on anaerobic digestion of African catfish (Clarias gariepinus) sediment sludge

Klein,

Schüch,

Foth

et al. 2024

Front. Sustain. Food Syst.

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In Germany, warm water Recirculating Aquaculture Systems (RAS) are generally integrated with biogas plants. The process sludge produced in aquaculture could be utilized to generate energy. This study investigates the potential of process sludge from commercial African catfish (Clarias gariepinus) warm water RAS, alongside associated plant production residues (whole plants and pruning residues) for energy generation through anaerobic digestion. Biogas tests, including batch, semi-Continuous Stirred Tank Reactor (CSTR), and Upflow Anaerobic Sludge Blanket Reactor (UASB) were conducted. In batch, methane yields were 229 L(N) / kg VS from the sludge and 173–184 L(N) / kg VS from the various plant substrates (cucumber, paprika, and tomato plants). During CSTR operation, mono-fermentation of sludge produced a methane yield of 265 L(N) / kg VS. Co-fermentation with 25% cucumber residues, based on VS, increased this value to 381 L(N) / kg VS. Mono-fermentation of sludge in the UASB reactor yielded a maximum of 329 L(N) /kg VS. The relatively low TS content and unfavorable C/N ratio in C. gariepinus sludge, along with the low energy density and occasional high sulfur content in the investigated plant substrates, present challenges for CSTR biogas production. These challenges can be partially mitigated through substrate combination. For mono-fermentation of African catfish RAS sludge, the UASB reactor is recommended. Improved solids separation, extraction, and concentration techniques at aquaculture operations are essential for the efficient utilization of aquaculture sludge, especially from African catfish, in biogas plants.

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Onsite anaerobic treatment of aquaponics lettuce waste: digestion efficiency and nutrient recovery

Cited by 10 publications

References 46 publications

Can Aquaponics Be Utilized to Reach Zero Hunger at a Local Level?

Can Aquaponics Be Utilized to Reach Zero Hunger at a Local Level?

Generalised Physicochemical Model (PCM) for Wastewater Processes

Enhancing energy recovery from aquaculture residual materials: a focus on anaerobic digestion of African catfish (Clarias gariepinus) sediment sludge

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