Device and method for protein feed production by recycling of aquaculture wastewater treatment process

Abstract

The invention discloses a device and a method for protein feed production by recycling of an aquaculture wastewater treatment process, which solve the problems of high cost, low treatment efficiency, low utilization of systematic nutrient assimilation and the like of the prior aquaculture water treatment process, starting from the angle of aquaculture water treatment of an industrial circulating water aquiculture system. The device comprises an integral biological floccules culturing and recycling device. The method comprises the following steps: culture wastewater enters the reacting chamber of the integral biological floccules culturing and recycling device from the middle part of the device in batches, and is converted into biological floccules through utilization and proliferation of microbes in the reacting chamber; and the treated wastewater is recycled to an aquiculture system once again, the biological floccules with a certain sludge age is collected to a recycling chamber on the lower part of the device by a regular spoil disposal mode, and the obtained biological floccules can be directly used in a feed protein source after being subject to simple air drying treatment, thus the dual purpose of aquaculture wastewater purification and waste recycling can be realized.

Description

technical field [0001] The invention relates to aquaculture water treatment technology, in particular to a method and a device for removing ammonia nitrogen in an industrialized circulating aquaculture system and using it to produce feed protein. Background technique [0002] The industrialized recirculating aquaculture system has become an aquaculture model that is highly praised and developed around the world because of its resource-saving and environment-friendly features. The core treatment technology of the traditional recirculating aquaculture system is mainly biological filtration, that is, through the nitrification-denitrification treatment unit, the main pollutant ammonia nitrogen in the aquaculture water is converted into nitrogen through nitrification (Formula 1, 2) and denitrification (Formula 3) escape system, its chemical formula [0003] NH 3 +CO 2 +1.5O 2 →NO 2- +H 2 O+H + [0004] NO 2- +CO 2 +0.5O 2 →NO 3- [0005] NO 3 - + organic carbon → N...

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Problems solved by technology

[0006] However, in actual production practice, the above method still faces the following disadvantages: (1) Due to the low organic load of the water body in the industrial recirculating aquaculture system, the concentration of organic matter cannot meet the needs of complete heterotrophic denitrification, and the denitrification efficiency is limited. An artificial source of organic carbon

However, if a liquid carbon source is added, it is difficult to accurately measure the amount of addition due to the different water quality conditions of the aquaculture, thus facing the risk of water quality fluctuations and reaction-derived by-products caused by excessive organic matter, and the requirements for device configuration and working conditions are high, so it is not suitable Aquaculture water treatment

If a degradable polymer such as PBS (poly-butylene-succinate, polybutylene succinate) is used as a solid carbon source, although the metering problem of adding a liquid carbon source is avoided, there are still high costs and carbon source release. Low efficiency and other issues, thus restricting the denitrification efficiency of the system

In addition, if complete autotrophic denitrification (such as sulfur autotrophic denitrification) is used for denitrification, because the reaction will accumulate a large amount of by-product sulfate, it is very easy to induce a large number of proliferation of sulfate-reducing bacteria in the culture system to convert it into Hydrogen sulfide, thus causing poison to the breeding objects

(2) The water quality of the aquaculture system fluctuates in different aquaculture cycles, and its denitrification unit is prone to produce N under abnormal operating conditions. 2 O and other denitrification by-products pollute the environment, which is contrary to the basic characteristics of "environmental friendliness" of the industrialized recirculating aquaculture system

(3) Nitrogen that has not been assimilated during the breeding cycle is converted into gaseous products and removed through the above-mentioned pathways, which loses the opportunity to be reused by the breeding objects, resulting in low efficiency of assimilation and utilization of nutrients in the system as a whole

(4) The above-mentioned nitrification-denitrification process is generally equipped with a biological filter. The filter material is extremely susceptible to sedimentation and clogging due to the influence of solid particles in the water and aging shedding biofilm, and the removal rate is limited by mass transfer, thus affecting the overall unit volume load of the system. Performance and Operational Stability

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