Method for removing organic particles and nutritive salt in closed cycling aquaculture water

Abstract

The invention discloses a method for removing organic particles and nutritive salt in closed cycling aquaculture water. The method is characterized by comprising the following steps: establishing a plant filter chamber communicated with a culture pond in a closed cycling aquaculture system; planting 3.0 to 4.5m2 of myriophyllum aquaticum or Italian ryegrass in the plant filter chamber on the basis of per cubic meter of the aquaculture water; placing the plant filter chamber in a sunlight room with humidity of between 70 and 80 percent; controlling the illumination intensity of the plant filter chamber to be between 8,000 and 25,000lux and the aquaculture temperature to be between 15 and 35 DEG C; driving the aquaculture water to cycle to ensure that the aquaculture water flows through the plant filter chamber and flows back to the culture pond and the daily circulation quantity of the aquaculture water is 6 to 10 times of the volume of the aquaculture water. The method has the advantages of effectively removing the organic particles, inorganic nitrogen and phosphor and other nutritive salts and building excellent water quality, and can be applied to the freshwater fish closed cycling aquaculture system.

Description

technical field [0001] The invention relates to a method for removing organic particles and nutrient salts in aquaculture water, in particular to a method for removing organic particles and nutrient salts in closed-circulation aquaculture water. Background technique [0002] At present, in the closed circulation aquaculture system, most of the biofilm nitrification tanks are used to purify the water quality, that is, the organic matter and ammonia nitrogen in the aquaculture wastewater are converted into relatively low-toxic nitrate through the biofilm nitrification tank, and the water quality can be improved to a certain extent. However, long-term use of this water quality treatment method can lead to a large amount of nitrate accumulation in the aquaculture water body, and at the same time, it cannot remove other nutrients such as organic particulate matter and inorganic phosphorus in the aquaculture water body. [0003] A Chinese patent for a compound biological denitrifi...

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Problems solved by technology

[0002] At present, in the closed circulation aquaculture system, most of the biofilm nitrification tanks are used to purify the water quality, that is, the organic matter and ammonia nitrogen in the aquaculture wastewater are converted into relatively low-toxic nitrate through the biofilm nitrification tank, and the water quality can be improved to a certain extent. However, the long-term use of this water quality treatment method can lead to a large amount of nitrate accumulation in the aquaculture water, and at the same time, it cannot remove other nutrients such as organic particles and inorganic phosphorus in the aquaculture water.

[0003] A Chinese patent for a compound biological denitrification method for closed circulation aquaculture water (the authorized announcement number is CN1653893A, and the publication date is August 17, 2005), which discloses a method for transforming aquaculture water by using aquatic plant large-scale Gracilaria spp. organic matter and ammonia nitrogen in the aquaculture water, this method can effectively remove a large amount of nitrate accumulated in the aquaculture water, but the removal effect on organic particulate matter and inorganic nitrogen, phosphorus and other nutrients in the aquaculture water is not obvious, and this aquatic plant is suitable for seawater In the closed circulation culture system of fish, it is not suitable for the closed circulation culture system of freshwater fish