1.Why do recirculating aquaculture
With the advancement of aquaculture technology and the expansion of market demand, aquaculture in China has developed rapidly in the past 10 years. The remaining bait, chemical residues, and The excreta of aquaculture organisms rich in nitrogen, phosphorus, organic matter and toxic substances are continuously discharged into lakes, reservoirs, rivers and seas, aggravating the degree of eutrophication and water pollution of aquaculture water bodies and adjacent water bodies, and destroying the original The ecological environment has resulted in a large-scale production reduction and frequent deaths in aquaculture. At the same time, water pollution has in turn restricted the development of aquaculture. Therefore, the treatment and recycling of aquaculture wastewater has gradually attracted attention. A lot of practical results have been achieved in the research of industrial circulating aquaculture life-saving treatment technology and aquaculture water treatment. The factory-based circulating water subsistence treatment aquaculture system also came into being. The aquaculture system was popularized and applied by building a demonstration aquaculture plant to promote the adjustment of the aquaculture industry structure, realize the increase of farmers’ production and income, stimulate the regional economic construction, reduce the use of drugs, improve the It has a constructive role in reducing the quality of aquatic products, reducing the discharge of aquaculture wastewater, and reducing environmental pollution. By innovating the agricultural and aquaculture model, we seek benefits from the environment and achieve clear waters and lush mountains.
With the continuous expansion of the scale of aquaculture, the discharge of aquaculture wastewater is also increasing, which not only pollutes water sources, but also pollutes lakes, rivers, reservoirs, and marine environments. Increase the use of drugs. In order to increase production, the uncontrolled and large-scale use of drugs has become the norm, which intensifies environmental pollution. This vicious circle is still spreading. The contradiction between the development of traditional fish farming and the control of the environment has become increasingly prominent. Therefore, the development of high-efficiency factory-based circulating water for subsistence treatment and aquaculture is the strategic direction to solve water pollution, reduce environmental pollution and ensure the safety and quality of aquatic products.
2. About our integrated industrial recirculating aquaculture system
Industrial recirculating aquaculture system of water body mainly consists of drum filter, biofilter, protein skimmer.
Drum filter system:
It can filter biological excrement and food residues above 78 μm, remove
particulate impurities in the water body, reduce the turbidity of the water body, and carry and remove suspended solids, nitrates and organic matter in the water.
Protein Skimmer:
It can filter suspended particles larger than 1 μm and separate soluble proteins, etc. It also has the functions of removing organic matter, harmful gases and increasing dissolved oxygen in water. At the same time, the ozone reaction is used to oxidize or kill bacteria and other pathogenic microorganisms in the aquaculture water, deodorize, oxidize heavy metal ions in the water, and degrade harmful substances. It can achieve the functions of purifying water and stabilizing water quality .
Biochemical filtration system:
Using a floating environment-friendly plastic filler with a large specific surface area, through the biofilm filtration technology, the aquaculture water is denitrified, andthe CO2, H2S Harmful gases are released by aeration.
Oxygenation system:
Use air supply and nano-aeration diffusion and dissolving device to oxygenate the aquaculture water, or use pure oxygen to increase the oxygenation of the aquaculture water through the pressurized dissolved oxygen system, adjust and increase the dissolved oxygen content of the aquaculture water, and effectively protect the water in the
water . Dissolved oxygen levels required for fish farming.
3.Aquaponics symbiosis to achieve zero discharge
The wastewater rich in nitrogen, phosphorus and other compounds discharged from the industrialized circulating water subsistence treatment aquaculture is transported to the planting greenhouse, and the filtered water is recycled into the vegetable production system as a nutrient source to supply vegetable roots. Absorption, absorbed by vegetables, and then returned to the aquaculture pond again to enter the next cycle.
4. Conclusions
Factory-based circulating water subsistence treatment aquaculture project complies with the national environmental protection aquaculture and aquatic product traceable and monitorable food safety requirements, and can timely solve the reduction in the income of fishermen and farmers due to the removal of cage aquaculture, and the amount of fish in the market. The impact of reduced supply. High output, good economic benefits, in line with the industrial policies of the country, region and industry, with strong social and economic benefits, so through its demonstration role to promote the modernization of aquaculture in various places, create new fishery advantages, realize fishery efficiency and farmers’ income. , rural stability, further building a harmonious new countryside, innovative new agricultural development will play an important role in promoting.
