Method for treating fish-farming circulating water

A technology for circulating water and fish ponds, applied in the field of aquaculture, can solve the problems of no biological disease prevention measures, unstable effluent quality, low purification efficiency, etc. The effect of high purification efficiency

Inactive Publication Date: 2010-07-14
HEILONGJIANG RIVER FISHERY RES INST CHINESE ACADEMY OF FISHERIES SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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] Specific implementation mode 1: A method for processing fish farming circulating water in this embodiment is carried out in the following steps: 1. The water discharged from the fish farming pond is added to the sedimentation tank for precipitation, and the hydraulic retention time is 0.25h to 0.3h; 2. The water treated in step 1 is added to the valveless filter tank 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~12g / L; 4. step 3 The treated water is added to the fluidized-bed biological filter with a stripper, and the inner chamber of the fluidized-bed biological filter is filled with sand particles loaded with biofilms. The sand particles have a particle size of 0.5mm~1.0mm. The rate is 25% to 30% (volume). The outer chamber of the fluidized bed biofilter is filled with biofilm-loaded polyethylene and embedded bacteria particles. The particle size of the polyet...

specific Embodiment approach 2

[0012] Specific embodiment two: This embodiment is different from specific embodiment one in that: the filter material in the valveless filter described in step two is a rock with a particle size of 3cm-8cm and a particle size of 0.8mm-1.2mm The sand and stones are packed on the bottom of the valveless filter, and the sand is packed on the stone layer. The height ratio of the stone layer to the height of the sand layer is 1:0.4-0.6. Others are the same as the first embodiment.

specific Embodiment approach 3

[0013] Specific embodiment three: this embodiment is different from specific embodiment one or two in that: the filter material in the valveless filter tank described in step two is a rock with a particle size of 3cm~8cm and a particle size of 0.8mm~ For sand grains of 1.2 mm, the ratio of the filling height of the stones to the filling height of the sand grains is 1:0.5, and the others are the same as in the first or second embodiment.

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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 treatment are 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 preventing the 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 specifically relates to a method for processing fish farming 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 recycled water to raise fish can greatly save water resources, avoid external pollution, and reduce breeding costs. The existing recycled water The methods of processing circulating water in fish farming systems mainly include physical filtration methods and fixed-bed biological purification methods. Among them, physical filtration methods, such as the capacity of 50m 3 The 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 equipment investment is large; while the fixed-bed biological purification method is prone to blockage or channeling as the running time increases, m...

Claims

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Application Information

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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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