Copy of Fish and vegetable symbiotic system

A fish vegetable symbiotic system for high-density aquaculture of freshwater bass

The principle of fish vegetable symbiosis system:

Ecological cycle chain of fish and vegetable symbiotic system

The fish vegetable symbiotic system is a very promising new model of ecological circular agriculture. It uses scientifically designed water circulation processes and filtration biochemical equipment to decompose organic substances such as ammonia nitrogen produced in fish farming into nitrite under the action of beneficial microorganisms, and ultimately convert them into nitrate inorganic substances. These inorganic salts are absorbed by the absorption of vegetable roots, and this cycle is repeated to maintain the cleanliness and harmlessness of the aquaculture water in the long term. Therefore, the fish vegetable symbiosis system is a true ecological circular agricultural technology that does not require water exchange for aquaculture and fertilization for vegetable cultivation.

Compared with a purely industrialized circulating water aquaculture system, the fish vegetable symbiosis system absorbs nitrate inorganic substances in the water through the dual action of equipment and plants, resulting in lower investment, lower operating costs, and more stable and reliable operation. Compared with traditional aquaculture, the unit area yield of fish in the fish vegetable symbiosis system is 5-8 times higher than that of traditional cultivation methods, and the quality and yield of vegetables produced far exceed that of traditional cultivation methods. The production type fish vegetable symbiotic system has ideal economic and environmental benefits, representing the future direction of agricultural development

Design Case

Environment: Wenluo style glass greenhouse (top glass or sunboard)

Area: 1920 square meters (48 meters * 40 meters)

Breeding planning:

The breeding area covers an area of approximately 1440 square meters. In order to increase aquaculture production and improve space utilization, aquaculture will be divided into two layers: upper and lower. Each layer will have 22 sets of 5.8 meter diameter aquaculture ponds and 1 set of diversion ponds, accounting for approximately 1100 square meters. The remaining space includes filtration and biochemical system equipment, electrical room, and control center. The single-layer 22 group aquaculture pool is divided into 2 independent systems, with each system having 11 groups of aquaculture pools with a capacity of approximately 430 cubic meters. The total water body for aquaculture in the entire system is about 1720 cubic meters, with a safe aquaculture density of 50 kilograms per cubic meter. Calculated based on an annual production of 2 batches of fish, the annual production of finished sea bass is 172 tons. To ensure the safe and stable operation of the system, a filtration biochemical system is designed in the equipment area, with a ratio of 14.5% between biochemical and aquaculture water. Under the joint regulation of vegetables, beneficial microorganisms, ozone equipment, etc., it can meet the needs of stable and high-yield aquaculture.

Under the given conditions of a vegetable planting area (covering an area of 480 square meters), an efficient three-dimensional cultivation mode can be used to expand the vegetable planting area to 2000-3000 square meters, which can partially absorb inorganic salts from the aquaculture water body, but cannot completely absorb them. In this situation, it is necessary to ensure the water quality safety of the aquaculture system by changing the water volume by about 5% -8% daily. If we want to fully achieve a natural balance between fish and vegetables, the optimal planting area is recommended to cover an area of 1000-1500 square meters, with an expanded planting area of 5000-7500 square meters.

Configuration options for devices

In order to improve the automation and intelligence level of the system, an intelligent monitoring function is designed to achieve online detection of pH value, water temperature, ammonia nitrogen, nitrite, dissolved oxygen (DO), electrical conductivity (EC), chemical oxygen demand (COD), and other indicators in the aquaculture water body. At the same time, temperature and humidity, light intensity, CO2 concentration, and other indicators in the spatial environment are detected online, achieving on-site display, remote transmission, automatic recording and alarm functions. In addition, the system has an online monitoring function for operating conditions, which can record and analyze the working status of important equipment in the system, such as microfilters, oxygen concentrators, ozone machines, ultraviolet sterilization lamps, Roots blowers, constant temperature equipment, etc. According to the technical specifications and preset work arrangements of the circulating water aquaculture system, the working status of each equipment is regularly evaluated, and evaluation results such as normal, faulty, and suspicious are provided. To avoid system crashes and damage caused by device malfunctions or incorrect states.

The system is equipped with an automatic fish discharge function, which is achieved through a large-diameter fish discharge pipeline or by configuring a fish discharge machine equipment.

The key electrical components used in various equipment in the system can all adopt reliable products from foreign first tier brands such as Siemens, Schneider, ABB, etc. as required. The circuit breakers, AC contactors, instruments, PLC programmable controllers, and other electrical equipment in the system control center and distribution cabinet are all reliable products from foreign first tier brands such as Siemens, Schneider, ABB, etc.

This system mainly focuses on high-density freshwater fish farming, with three-dimensional and efficient vegetable cultivation as a necessary supplement. The water and nutrients required for vegetable cultivation come from the circulating water aquaculture system. The breeding system automatically delivers an appropriate amount of biochemical clean water to the collection tank based on the water volume in the planting system. After being absorbed and utilized by vegetables, water containing nutrients such as nitrate in the collection tank is pumped back to the regulating tank of the aquaculture system.

System energy consumption situation:

Calculated based on a single-layer aquaculture system (22 sets of aquaculture ponds):

The long-term working equipment includes: Roots blower 7.5KW; Oxygen concentrator 11KW; Micro nano gas water mixing device 430W * 8=3.4KW; 2 sets of protein separators with a power of 10KW The power of the high flow water pump is 11KW, and the load of all long-term working equipment is 43KW.

Intermittent working equipment includes: constant temperature machine, sterilizer, ozone machine, microfilter, underwater camera, bait feeder, etc. The average operating power of all devices is about 5.5KW

Therefore, the average load in a single-layer aquaculture area is around 48.5KW, and the average load in a double-layer aquaculture area can be calculated as 100KW.

Project site photos