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Aquaculture net cleaning with cavitation improves biofouling removal

文献类型： 外文期刊

作者： Yuan, Tai-Ping 1 ; Huang, Xiao-Hua 1 ; Hu, Yu 1 ; Wang, Shao-Min 1 ; Tao, Qi-You 1 ; Pang, Guo-Liang 1 ;

作者机构： 1.Minist Agr & Rural Affairs, Key Lab Open Sea Fishery Dev, Guangzhou 510300, Peoples R China

2.Chinese Acad Fishery Sci, South China Sea Fisheries Res Inst, Guangdong Cage Engn Res Ctr, Guangzhou 510300, Peoples R China

3.Chinese Acad Fishery Sci, Sanya Trop Fisheries Res Inst, South China Sea Fisheries Res Inst, Trop Aquaculture Res & Dev Ctr, Sanya 572018, Peoples R China

4.Chinese Acad Fishery Sci, South China Sea Fisheries Res Inst, 231 Xingangxi Rd, Guangzhou 510300, Peoples R China

关键词： Marine ANCS; Net cage biofouling; Cavitation cleaning technology; Cavitation jet biofouling removal rate

期刊名称：OCEAN ENGINEERING （ 影响因子：5.0； 五年影响因子：5.2 ）

ISSN： 0029-8018

年卷期： 2023 年 285 卷

页码：

收录情况： SCI

摘要： The attachment of a large number of biofouling organisms on net cages has a very negative impact on the safety of cage structure and aquaculture organisms. This paper presents a new type of marine aquaculture net-cleaning system (ANCS) that adopts the power of continuous cavitating jets to remove biofouling in underwater environments. The cavitation characteristics of the nozzle, which is the key component of the ANCS, were analyzed under different conditions in a submerged cage environment, and the system's cleaning rate with different inlet pressures (P) and nozzle diameters (d) was obtained. Under the same input flow rate and increasing nozzle aperture (from 0.6 to 1.0 mm), the gas phase volume fraction of the nozzle showed a rising trend (the maximum value reached 37.5% for the 1.0 mm nozzle) and jet velocity at 40 mm away from the nozzle was reduced by 85.6%-97.0%. Net-cleaning tests showed that, with an inlet pressure of 16.42 MPa and nozzle diameter of 0.8 mm, the ANCS achieved the highest rate of biofouling removal (79.8%) and the lowest specific energy consumption of removing unit mass fouling (5.13kw). The shellfish fouling organisms mainly fell off and their shells broke under the impact of the cavitating jet produced. After the cleaning experiment, most of the residues consisted in the soft byssus plaques of shellfish, which strongly adhered to the net. The soil on the net surface was completely removed, revealing the original color of the aquaculture cage net.

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