Tail water utilization process of a circulating aquaculture system

Abstract

A new process for utilizing tail water of a recirculating aquaculture system, comprising the following steps: (1) providing a recirculating aquaculture system, a tail water pretreatment system and a self-circulating hydroponic system; (2) passing the tail water produced by the recirculating aquaculture system through After sedimentation and filtration, the scale of the hydroponic system monomer is determined according to the quality of the remaining supernatant; (3) After the tail water supernatant is sterilized by the micro-nano bubble oxygenation and sterilization integrated equipment, it is diluted with clean water; the diluted tail water supernatant As the bottom water of the nutrient solution in the hydroponic system, add elements to adjust the composition and then enter the hydroponic system; (4) Dynamically monitor the EC value and pH of the water body in the hydroponic system; (5) Set a reasonable time node, and use micro-nano bubbles to increase oxygen and sterilize. Chemical equipment for aerobic irrigation of the hydroponic system. Utilizing the process of the invention can realize zero discharge in a high-density circulating aquaculture system; replace part of the nutrients with the treated tail water, and reduce the cost of hydroponics.

Description

Technical field: [0001] The invention belongs to the field of agricultural technology, and relates to a process for resource utilization of sewage in an aquaculture system. Background technique: [0002] The recirculating aquaculture system (RAS) responds to the needs of the transformation of traditional aquaculture to factory production, and is being piloted across the country. The fish and vegetable symbiosis system is a production mode that adheres to the concept of sustainable development and meets the requirements of green agriculture, and can be used for landscape modeling for people to watch. The micro-nano bubble technology can quickly increase the dissolved oxygen in the water body in a short time, and because the bubbles are small in size, they can stay in the water body for a long time, so it can be used for oxygenation irrigation, and the use of ozone source can realize water body sterilization and disinfection. [0003] RAS can theoretically achieve a water res...

AI Technical Summary

Problems solved by technology

[0003] RAS can theoretically achieve a water resource utilization rate of more than 95% and the highest breeding density at present. However, in the actual production process, with the increase of the breeding density, if the tail water is not discharged after each feeding, the feces in the fish pond will be reduced. Accumulated for a long time, and in a short period of time will cause a sharp deterioration of water quality and easy to cause pipe blockage

The discharge of RAS tail water will pollute natural water bodies, seriously restricting its promotion and development in cities

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