This article introduces the Three-Pond and Two-Dam Technology for treating pond aquaculture tail water. It details how the tech uses physical, biological and ecological means to remove pollutants. It elaborates on its components and compares it with the AAO process, highlighting its low energy and adaptability advantages. Practical cases show its effectiveness and broad prospects for sustainable aquaculture.demonstrating its unique value and advantages.

Technical Overview: Combining Ecology and Practicality

The three-pond and two-dam technology is mainly applied to aquaculture industries such as fish farming. By comprehensively using physical, biological, and ecological means, it can efficiently remove pollutants such as suspended solids, nitrogen, and phosphorus in the tail water, laying a solid foundation for the recycling of water resources. This technology not only helps to reduce the pollution pressure of aquaculture tail water on the surrounding environment but also, to a certain extent, realizes the sustainable utilization of water resources, which is in line with the current concept of green development.

Technical Composition: An Exquisite Collaborative Operation System

The three-pond and two-dam system consists of five core structures, each playing its unique role while closely collaborating with others. The sedimentation pond is like a dedicated “large particle scavenger”. It not only quickly captures suspended solids in the water through physical sedimentation but also skillfully plants emergent, submerged, and floating plants (such as reeds, Iris wilsonii, etc.), which account for about half of the area of the sedimentation pond. By relying on the natural adsorption properties of these plants, the water quality is further purified. The filtration dam is like a tight “precision filtration barrier”. It adopts a steel frame structure, and the interior is filled with carefully selected porous media such as gravel or oyster shells to accurately filter and efficiently adsorb suspended solids, nitrogen, phosphorus, and heavy metals in the water. The aeration pond is like a busy “microbial incubation factory”, similar to the aerobic tank in the AO process. Through the scientific configuration of fillers and efficient aeration by blowers, it creates a favorable living and breeding environment for microorganisms. By regularly supplementing bacillus subtilis and nitrifying bacteria, the efficiency of pollutant removal is greatly improved. The ecological purification pond is a harmonious symbiotic micro-ecosystem, planting submerged plants such as Myriophyllum verticillatum and stocking filter-feeding aquatic animals such as silver carp and bighead carp to further optimize the water quality through biological purification and ecological regulation.

Treatment Process: A Progressive Purification Journey

From the moment the aquaculture tail water enters the system, it embarks on a meticulously arranged progressive purification journey. First, the water flows into the sedimentation pond, where large particles of suspended solids quickly settle under the action of gravity. Subsequently, after passing through the first filtration dam, the concentration of pollutants is significantly reduced. Then, it enters the aeration pond, where microorganisms play their part in a suitable environment, decomposing and removing key pollutants such as nitrogen and phosphorus. After that, it passes through the second filtration dam for secondary inspection to ensure that the water quality is further improved. Finally, in the ecological purification pond, aquatic plants and animals work together to complete the in-depth purification.

Comparison with the Traditional AAO Process: Each Has Its Own Merits

Compared with the traditional AAO process, the three-pond and two-dam technology has its unique advantages and limitations. Both have the ability to remove pollutants such as COD, nitrogen, and phosphorus. However, although the AAO process has a higher removal efficiency, it is accompanied by higher energy consumption costs. While the three-pond and two-dam system has a relatively lower total removal amount, especially with limited removal effect on total nitrogen, it shows excellent adaptability in treating aquaculture tail water with relatively low water quality. Moreover, it has prominent advantages in terms of low energy consumption and ecological friendliness, making it more suitable for the actual operation needs of a large number of small and medium-sized aquaculture farms.

Practical Cases: A Demonstration of Remarkable Achievements

Numerous practical cases have fully demonstrated the effectiveness and practicality of the three-pond and two-dam technology. In a certain three-pond and two-dam project, it covers an ecological ditch, a sedimentation pond, two filtration dams, an aeration pond, and an ecological pond. The total area of the system is approximately 9,000 square meters. After treatment, the water quality has reached extremely high standards: CODMn is reduced to 10mg/L, ammonia nitrogen is less than 0.5mg/L, total nitrogen is less than 2mg/L, total phosphorus is less than 0.5mg/L, pH is maintained between 7 and 8, and SS is less than 35mg/L. In another project for treating fish farming tail water, the sedimentation pond has an area of 3,000 square meters and a depth of 4 meters, and the aeration pond has an area of 2,668 square meters and a depth of 3.5 meters. Two blowers with a power of 3.7kW each are configured. Finally, the treated effluent is successfully used for paddy field irrigation, achieving the recycling of water resources. There is also a three-pond and two-dam system in a certain aquaculture farm. The ecological pond covers an area of 2,335 square meters and has a depth of 3 meters. It is equipped with plants such as lotus and Hydrilla verticillata, and 30 silver carps, 10 bighead carps, and 10 grass carps are stocked. The system operates stably, and the effluent water quality is good, fully meeting the reuse standard.

Conclusion: A Green Technology with Broad Prospects

The three-pond and two-dam technology, through the organic combination of physical, biological, and ecological means, provides a practical solution for the treatment of aquaculture tail water, especially suitable for aquaculture environments with relatively low water quality. Although its removal efficiency is slightly inferior to that of the traditional AAO process, its advantages in terms of energy consumption and ecological friendliness endow it with important value in practical applications. Judging from multiple successful practical cases, this technology has been successfully implemented in many aquaculture farms, playing a positive role in the treatment of aquaculture tail water and the recycling of water resources. It has broad promotion prospects and is expected to become an important driving force for the green and sustainable development of the aquaculture industry.

#AquacultureTailWaterTreatment #ThreePondTwoDamTechnology #WaterResourceRecycling #EcologicalTreatment #AquacultureSustainability

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