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doc13100 Turning_Fish_Waste_into_Plant_Nutrients.pdf
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"text": "Kentucky State University Cooperative Extension Connections"
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"text": "Ciera L. Davis Extension Associate, Aquaponics & Hydroponics\nDeira Watts Undergraduate Research Assistant\nLeo Fleckenstein Senior Research Associate\nJanelle Hager Aquaponics State Specialist\nDr. Avinash Tope Associate Professor, Human Nutrition and Food Safety"
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"text": "Aquaponics is a hybrid growing system that combines fish and plant production in a recirculating water system (hydroponics). Fish are fed a commercial fish feed, plants use nutrients dissolved in the water for growth, and solid fish waste is removed."
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"text": "Despite being resource efficient, there is a need to dispose of the concentrated fish effluent (mineralization). These solids contain valuable nutrients, including nitrogen (N), phosphorus (P), potassium (K), calcium (Ca), magnesium (Mg), and other micronutrients that can improve plant growth and limit the need for supplemental nutrients."
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"text": "Mineralization is a simple process that recovers these nutrients by using native beneficial bacteria to convert nutrients bound within the solids into plant-available forms."
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"text": "Mineralization of fish effluent can be compared to composting in soil. In aquaponics, concentrated fish solids are discharged into an offline holding tank. Nutrients are bound in their organic form and are not readily available to plants. Microbes degrade these organic molecules, releasing nutrients in an inorganic form that plants can use."
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"text": "Mineralization can occur in two ways:1. aerobic (with oxygen) and 2. anaerobic (without oxygen or low oxygen). In both types, waste sludge is collected from the solids filter and moved to a separate mineralization tank. Under aerobic conditions, the sludge is aerated continuously, promoting the growth of aerobic bacteria essential to the mineralization process. Over time, the microbes digest the solids, greatly increasing levels of essential nutrients like N, P, Mg, and sulfur (S), as well as limiting nutrients like K and Ca.\nAfter 10 to 14 days, the aeration is shut off, the sediments are allowed to settle, and clean water can be transported directly to the sump of an aquaponic system."
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"text": "Under anaerobic conditions, bacteria decompose organic matter in tanks with little to no oxygen. While this method can be useful for recovery of specific nutrients, if not managed properly, anaerobic digesters can result in toxic levels of ammonia for both fish and plants."
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"text": "2. How do I manage the mineralization cycle?",
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"text": "Most aerobic mineralization systems are operated as batch or continuous. Batch system use multiple tanks operating in rotation. While one tank is actively mineralizing, another is being filled with fresh waste, and a third is used as the finished nutrient solution. Continuous systems are constantly being filled and then drained, without concern for complete mineralization. Many producers will opt for a continuous system, as it conserves space, requires less management, and shows comparable nutrient recovery to batch systems."
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"text": "A good rule of thumb is to have your mineralization system be 5-10% of your system volume. For a 4,000-gallon system, a continuous mineralization tank will be ~250 gallons. In a batch system, you may have three 300-gallon tanks."
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"text": "For mineralization, almost any tank can be utilized; however, the most important consideration is that the tank is food-grade and UV-resistant. Intermediate Bulk Containers (IBC) are a good option, as they are low cost and food safe.\n5. Target a dissolved oxygen level of 4-6 mg/L"
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"text": "To accomplish this, at least 1 cubic foot per minute (CFM) of aeration per 100 gallons is recommended. The air pump may need to be upsized to accommodate for the depth of the tank. Multiple air diffusers are preferred."
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"text": "Mineralized fish waste can also be directly applied to soil to increase nutrient levels for soil-grown plants. Use in moderation due to potential accumulation of salts in soil."
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"text": "Acknowledgement: National Science Foundation No. KYX80-23-37A."
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"text": "Cripps, S. J., & Bergheim, A. (2000). Solids management and removal for intensive land-based aquaculture production systems. Aquacultural Engineering, 22(1–2), 33–56.",
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"text": "Cripps, S. J., & Kelly, L. A. (1996). Reductions in wastes from aquaculture. In Aquaculture and water resource management (pp. 166–201). Blackwell Science.",
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"text": "Malone, R. F., Chitta, B. S., & Drennan, D. G. (1993). Optimizing nitrification in bead filters for warmwater recirculating aquaculture systems. In Techniques for modern aquaculture (pp. 315–325). American Society of Agricultural Engineers.",
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