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A circulating seawater aquaculture system based on microalgae membrane bioreactor

A membrane bioreactor, marine aquaculture system technology, applied in biological water/sewage treatment, seawater treatment, application, etc., can solve the problems that hinder the sustainable development of the marine aquaculture industry, self-pollution of aquaculture, and high construction costs, and achieve design Reasonable, avoid injury or influence, easy to operate effect

Active Publication Date: 2021-02-02
ZHEJIANG OCEAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

my country's marine aquaculture industry is developing rapidly, with increasing species, expanding scale, and increasing intensification. However, there are many problems such as excessive energy consumption and self-pollution of aquaculture, which hinder the sustainable development of the aquaculture industry. Mariculture can reduce the potential impact of aquaculture wastewater discharge on the environment, and can greatly save land area and water consumption. At the same time, it also has the advantages of short breeding cycle, high output and product price. The construction cost is high, and the operation energy consumption is large, so the research on the wastewater treatment technology in the recirculating mariculture is particularly important.

Method used

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  • A circulating seawater aquaculture system based on microalgae membrane bioreactor
  • A circulating seawater aquaculture system based on microalgae membrane bioreactor
  • A circulating seawater aquaculture system based on microalgae membrane bioreactor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] like figure 1 As shown, the effluent from the culture pond 1 enters the photobioreactor 2, and absorbs nitrogen, phosphorus and other substances in the aquaculture wastewater through the growth of microalgae. The residence time of the aquaculture wastewater in the bioreactor 2 is controlled at 1.0d-1.5d. The bottom of the bioreactor 2 is provided with a microporous diffuser 7 for aeration, and the introduced gas contains 4% CO. 2 air, the aeration intensity is 1.2-1.5m 3 / (m 3 d), provide stirring for the growth of algae liquid and provide the inorganic carbon source required for the autotrophic growth of microalgae, the algae liquid cultivated by photobioreactor 2 enters in the microalgae concentrated pond 3, and the bottom of the microalgae concentrated pond 3 is also provided with micropores The diffuser 7 is connected to the air compressor 6 to use air for air, and the aeration volume is 0.5-0.7m 3 / (m 3d), the main function is to provide agitation and control t...

Embodiment 2

[0031] like Figure 1-10 As shown, a circulating seawater culture system based on a microalgae membrane bioreactor includes a culture pond 1, and the culture pond 1 is connected with a photobioreactor 2, and the photobioreactor 2 is connected with a microalgae concentration pool 3 through a water pump 5, and the microalgae The interior of the algae concentration pool 3 is provided with an ultrafiltration membrane module 4, the outlet of the ultrafiltration membrane module 4 is connected to the culture pond 1 through a water pump 5, and the center of the culture pond 1 is provided with a sewage outlet 9 and a drain pipe 11. The absorption of microalgae cultivated in device 2 can effectively remove pollutants such as free ammonia and phosphate in the aquaculture wastewater. The concentration of free ammonia and active phosphate in the effluent of ultrafiltration membrane module 4 can be lower than the detection limit. It is circulated and transported to the culture pond 1, which...

Embodiment 3

[0042] like Figure 10 As shown, it is a block diagram of the operation process of the circulating seawater aquaculture system based on the microalgae membrane bioreactor. The microalgae absorb the nitrogen, ammonia and phosphate in the aquaculture wastewater below the monitoring limit, and transport the algae liquid in the photobioreactor to the microalgae concentration pool, and the algae liquid passes through the ultrafiltration membrane module to obtain clean water with excellent water quality. The clean water output is sent to the culture tank for re-cultivation. In the microalgae concentration tank, part of the algae liquid other than the ultrafiltration membrane module is re-injected into the photobioreactor, and the other part of the algae liquid is harvested and processed into cultured organisms. Feed is fed into the breeding pond, so as to realize the recycling of breeding water and nutrient elements in the breeding system.

[0043] The conventional technology in th...

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Abstract

The invention provides a circulating seawater aquaculture system based on a microalgae membrane bioreactor. The circulating seawater aquaculture system based on the microalgae membrane bioreactor comprises a culture pond, a photobioreactor is connected to the culture pond and connected to a microalgae concentration pond through a water pump, an ultrafiltration membrane assembly is arranged insidethe microalgae concentration pond, a water outlet of the ultrafiltration membrane assembly is connected to the culture pond through a water pump, and a sewage outlet and a drainage pipe are arranged at the center of the culture pond. According to the circulating seawater aquaculture system based on the microalgae membrane bioreactor, free ammonia, phosphate and other pollutants in culture wastewater can be effectively removed through an absorbing effect of microalgae cultivated in the photobioreactor; concentrations of free ammonia and active phosphate in outlet water of the ultrafiltration membrane assembly can be lower than limit of detection, and the outlet water is circularly conveyed to the culture pond, so that recycling of culture water can be effectively realized; and after being harvested, the microalgae is processed into baits and fed to the culture pond, so that recycling of nutrients in a culture process is realized.

Description

technical field [0001] The invention belongs to the technical field of circulating seawater aquaculture, in particular to a circulating seawater aquaculture system based on a microalgae membrane bioreactor. Background technique [0002] In recent years, emerging ecological restoration technologies have also been introduced into marine aquaculture systems. Most of the related research and applications are based on the purification effects of microorganisms, macroalgae, and filter-feeding shellfish. Seawater; while purifying water quality, it can obtain economically valuable aquaculture by-products such as shellfish; and the technical implementation and operation management are relatively simple and low-cost. [0003] Due to the overfishing of fishery and the aggravation of environmental pollution, marine fishery resources are declining day by day, and seafood products are far from meeting the market demand. We can only rely on the development of marine aquaculture to alleviat...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): A01K63/04C02F9/14C02F103/08
CPCA01K63/04A01K63/042C02F1/444C02F3/02C02F3/322C02F7/00C02F2103/08
Inventor 高锋李晨彭苑媛崔伟邓一兵
Owner ZHEJIANG OCEAN UNIV