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Method for treating fish-farming circulating water

A technology of circulating water and fish ponds, applied in the field of aquaculture, can solve the problems of no biological disease prevention measures, low purification efficiency, and large investment in equipment

Inactive Publication Date: 2011-11-16
HEILONGJIANG RIVER FISHERY RES INST CHINESE ACADEMY OF FISHERIES SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The present invention aims to solve the problems of large equipment investment in the existing physical filtration method, unstable effluent water quality of the fixed bed biological purification method, low purification efficiency and no biological disease prevention measures, and provides a method for treating fish farming circulating water

Method used

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specific Embodiment approach 1

[0010] Embodiment 1: A method for processing circulating water in fish farming in this embodiment is carried out according to the following steps: 1. The water discharged from the fish farming pond is added to the sedimentation tank for sedimentation, and the hydraulic retention time is 0.25h~0.3h; 2. The water treated in step 1 is added to the valveless filter for filtration; 3. The water treated in step 2 is added to the high-level water tank for aeration, and the dissolved oxygen content is controlled to be 7mg / L-12mg / L; 4. After step 3 The treated water is added to the fluidized bed biofilter with a membrane remover, and the inner chamber of the fluidized bed biofilter is filled with sand particles loaded with biofilm, wherein the particle size of the sand particles is 0.5mm to 1.0mm, and the filling of the sand particles The rate is 25% to 30% (volume), and the outer chamber of the fluidized bed biofilter is filled with polyethylene loaded with biofilm and embedded bacteri...

specific Embodiment approach 2

[0012] Specific embodiment two: the difference between this embodiment and specific embodiment one is that the filter material in the valveless filter described in step two is a stone with a particle diameter of 3 cm to 8 cm and a particle diameter of 0.8 mm to 1.2 mm The stones are filled in the bottom layer of the valveless filter, and the sand is filled on the stone layer, where the ratio of the height of the stone layer to the height of the sand layer is 1:0.4~0.6. Others are the same as in the first embodiment.

specific Embodiment approach 3

[0013] Specific embodiment three: the difference between this embodiment and specific embodiment one or two is that the filter material in the valveless filter tank described in step two is a stone with a particle size of 3 cm to 8 cm and a particle size of 0.8 mm to 8 cm. 1.2mm sand grains, wherein the ratio of the filling height of stones to the filling height of sand grains is 1:0.5, and the other is the same as the specific embodiment 1 or 2.

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Abstract

The invention relates to a method for treating fish-farming circulating water, which belongs to the field of aquaculture. The invention solves the problems that the equipment investment is large when a physical filtering method is adopted, and the effluent quality is unstable, the purification efficiency is low and no prophylactic measures for organisms exists when a fixed bed biological purification method is adopted in the existing fish-farming water treating method. The method of the invention is as follows: water discharged from a fishpond is precipitated in a settling pond and filtered in a valveless filter; a fluidized bed biofilter carries out biological cleaning on the filtered water; and after the anti-disease treatment and the ultraviolet sterilization thermoregulation treatmentare carried out on the purified water, the water returns to the fishpond. Compared with the physical filtering method, the invested capital of the facilities of the invention is reduced by 30%-40%, the quality of the treated water is stable, no worker is needed for tilting table and cleaning, and the purifying efficiency is high. Since fossilized rhodobacter sphaeroides are adopted for preventingthe fish from virosis, the capacity for fish is 2-3 times as much as that of a common circulating water fish-farming system, the survival rate of the fishes reaches to 95%-98%, the saved water resource reaches more than 90%, thus the method of the invention can be applied to the field of the aquaculture.

Description

technical field [0001] The invention belongs to the field of aquaculture, and in particular relates to a method for treating fish aquaculture water. Background technique [0002] Water is the material basis of aquaculture. Due to environmental pollution and other factors, high-quality water resources are becoming less and less. Using circulating water to raise fish can greatly save water resources, avoid external pollution, and reduce breeding costs. The existing circulating water The methods for treating circulating water in the fish farming system mainly include physical filtration method and fixed bed biological purification method, among which physical filtration method, for example, for a capacity of 50m 3 A large fish pond needs a large filter of the same volume or half the volume to ensure the water quality requirements of the fish pond, and the investment in equipment is large; while the fixed bed biological purification method, as the operation time increases, it is...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): A01K61/00A01K63/04C02F3/34
CPCY02A40/81
Inventor 战培荣刘伟
Owner HEILONGJIANG RIVER FISHERY RES INST CHINESE ACADEMY OF FISHERIES SCI
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