Ecological closed cycle water fish-cultivating method

Abstract

The present invention belongs to an industrialization aquiculture field, particularly relates to a closed cycle water industrialized fish cultivating system. The system separates solid and liquid in astorage sedimentation basin and a backwater channel sedimentation and rotational flow pool sedimentation, the tiny particulate matter is separated and purified by a sandrock filtering bed of a one level biological filter based on the water particulate matter separation, the water purified by the one level biological filter is feed into a two stage biological filter, the biological film of biologic filling material in the one level and the two stage biological filters is degraded with ammonia nitrogen and azote nitrous acid, the total purifying rate of the water particulate matter reaches morethan 99%, the culturing water is added with oxygen mechanically or by liquid oxygen, finally the water is disinfected and sterilized through a ultraviolet ray sterilizer, and the clean ecological water is feed into a fish pool, thus the waste water of the fish pool may be purified and used in repeat. The fish-cultivating system implements completely closed cycle water industrialized fish cultivation, the fish is out of a disease or less, and the fish survival is more than 80%.

Description

technical field [0001] The invention belongs to the field of industrialized fish cultivation, and in particular relates to an ecological closed circulation water industrial cultivation system. It mainly uses natural seawater to build a pollution-free and healthy seafood industrialized breeding base. Background technique [0002] At present, the disease in the process of industrialized circulating water seawater fish farming has become a limiting factor in the development, and the root cause of the disease is that the circulating water system is not clean enough, and sediments such as feces and residual bait remain in the breeding system, polluting the water quality, and the sediment It is not only a source of water pollution, but also a material basis for breeding pathogens. Therefore, in the seawater industrialized circulating aquaculture in China, microfilters or curved sieves are mainly used to filter sediments, which can only filter out larger particles above 100 micron...

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Problems solved by technology

[0008] In addition, Mr. Chen Xuefeng's "Factory Fish Farming Infrastructure Configuration" (Beijing Fisheries, Issue 4, 2003) uses a gravity-type valveless filter to filter Particles, this is a better solid-liquid separation method, the problem is: the valveless filter has high lift, high energy consumption, and backwashing wastewater, which is not suitable for use in low-lift, low-energy-consuming circulating water fish farming systems

[0009]Most of the factory aquaculture in my country adopts the direct-discharge flowing water fish farming. According to statistics, the total area of ​​the direct-discharging flowing water fish farming is about 3 million square meters, but , due to the direct drainage type factory fish farming method, the water quality cannot be recycled and purified, and it does not have the ability to prevent and control diseases, resulting in continuous and frequent occurrence of diseases, and diseases have become a restrictive factor for straight drainage type fish farming , The survival rate of fish farming is too low due to diseases, and the low survival rate leads to low output, so most of them are losing money, seriously underutilized, and the utilization rate of industrial fish farming facilities is less than 50%

[0012] The outstanding problems of the above-mentioned direct-flowing water-type or closed (actually semi-closed) circulating water factory farming methods are: (1) the breeding process The disease control is unfavorable, the disease occurs frequently, and the survival rate is low, generally below 40%, and the overall loss is in a state; (2) the general closed circulating water factory breeding project has high cost, high energy consumption, and sewage discharge, which is not conducive to promotion

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