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Premium member Presentation Transcript Waste recycling and Management in Aquaculture : Mallesh B AEM-08 Waste recycling and Management in Aquaculture Introduction : Introduction Aquaculture Types Inputs Management Final outcome Why waste recycling : Why waste recycling Prevents emissions of greenhouse gasses & water pollutants Minimization of pollution Volume reduction Sanitization of waste (composting) Slide 4: Stabilization of biodegradable compounds Supplies valuable raw materials to industry Stimulates development of greener technologies and Reduce the need for new land fills and incinerators. Value addition to the waste Which are the waste’s? : Which are the waste’s? Feed Residuce Metabolic Waste Pathogenic Waste Chemical Waste How these waste can be removed? : How these waste can be removed? Understanding waste characteristics is important in the design of a waste management system. Basic steps : Basic steps The first step in waste treatment is the removal of larger (settleable) solids. The second step is the removal of smaller (suspended) solids. The third step in waste treatment is disinfection. How these waste can be removed? : How these waste can be removed? Raceway and Tank Design Transformation Filtration Radiation / Ozone Constructed Wetlands Raceway and Tank Design : Raceway and Tank Design Proper engineering By controlling the flow of water through a system, Circular tanks with properly designed inlets, drains, and filters can remove the majority of solids with minimum labor inserting a device that will create a circular flow to collect the majority of the solids in the center Transformation : Transformation Dissolved organic waste (phosphorus and nitrogen) is a nutrient for plants. Biofilters will transform a toxic form of nitrogen (ammonia) into a nontoxic form (nitrate), which is a nutrient for many algae. Filtration : Filtration Drum, disk, bead, and sand filters are commonly used to trap and remove particles as small as 60 microns from the water. The dual drain design Cost of treatment can be greatly reduced by using smaller filters. Settling tanks. Radiation / Ozone : Radiation / Ozone Use of Ultraviolet radiation UV systems are a low maintenance, low risk method of disinfection. Low levels of ozone dissolved in the water will remove most pathogens. Ozone will improve particulate filtration and reduce the dissolved organic waste in the water. Constructed Wetlands : Constructed Wetlands Constructed wetlands are artificial shallow wastewater treatment systems planted with aquatic plants, and rely on natural processes to treat wastewater Wetlands function best as a secondary treatment for water Key factors effecting on-site waste Management : Key factors effecting on-site waste Management Operational practices Site factors and water supply Waste collection & disposal options Costs & available capital Best practice in waste management : Best practice in waste management Slide 17: Reducing the production of waste through efficient operational practices and use of best available technology is a key step in any waste management plan. Examples Feed management technology Use of correctly proportioned feeds to minimise wastage. Optimal feeding practices to prevent unnecessary waste. Best available technology Efficient removal of solids from effluent. By-product extracts through biotechnological techniques. Water use Economic use of water at all times. Minimization Reuse : Reuse Reuse of materials for the same or alternative purposes can result in high reductions in waste output. Local initiatives can promote the reuse of materials that might otherwise be discarded. Examples Farming materials Reuse of oyster bags and netting. reutilisation of organic farm wastes. Recirculation technology Reuse of water in a culture tank through filtration, skimming and aeration techniques. Recycling : Recycling Recycling of waste products to serve new purposes is becoming an increasingly viable option as more innovative ideas are developed to utilize wastes. Organic recycling on site is highly encouraged. Examples Organic Recycling Composting. Ensiling (two phase method of fermentation: aerobic and anaerobic), Recycling of Protein Oil. Inorganic Recycling Bulk feed bags, Metals such as steel & aluminum. Plastics of all form, Glass of all form. Energy Recovery : Energy Recovery Energy recovery methods such as anaerobic digestion, oil extraction and incineration allow for the extraction of a usable fuel source from aquaculture organic wastes. Examples Biofuel An efficient fuel source can be extracted from fish waste with a high oil content. Biogas Methane can be extracted from the anaerobic digestion of organic waste and used as a fuel. Disposal : Disposal Disposal methods isolate wastes from production in such a way that reuse or retrieval of the waste for the forseeable future is not considered. Conventional disposal methods have main involved landfill dumping. Drawbacks Disposal represents poor use of materials that could serve alternative uses. Legislation and environmental pressures mean disposal of both organic and inorganic waste from aquaculture is employed only as a last resort. Strict waste management legislation, means that inorganic material is the only aquaculture waste accept for dumping in most EU states. Laws & regulations : Laws & regulations On June 30, 2004 EPA finalized a rule establishing regulations for concentrated aquatic animal production (CAAP). Waste management act Regulations for Finfish Aquaculture Waste Control underground injection control (UIC) regulations for Aquaculture Waste Disposal Wells Slide 23: National pollutant discharge elimination system (NPDES) The Coastal Aquaculture Authority Act, 2005 Enacted by the Central Government on 23 June 2005 provides for the establishment of the Coastal Aquaculture Authority for regulating the activities connected with coastal aquaculture in coastal areas. Conclusion : Conclusion Sustainable growth of the aquaculture industry requires profitability, economic development, and waste management. Waste management decisions must be made on an individual basis due to site characteristics on the farm and within the watershed areas. You do not have the permission to view this presentation. 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