臭氧对养殖水体中颗粒物的絮凝和破碎作用

doi:10.16378/j.cnki.1003-1111.23033

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Abstract In order to understand the effect of ozone on flocculation and fragmentation of suspended particulate matter in aquaculture wastewater, the ozone concentrations corresponding to 0.5, 1.0, 1.5, 2.0 and 2.5 mg/L were aerated by an ozone generator for 5, 10, 15, 20 and 25 s in a 1 L ozone reaction vessel at a water temperature of (29±1) °C, respectively. Each ozone concentration was oxidized with the raw water in the circulating water biofloc shrimp culture system in Sanmao Aquaculture Farm in Songjiang District, Shanghai for 1, 2, 3, 4 and 5 min, and each combination test was repeated 3 times. Immediately after the treatment, the water quality index, the concentration of total residual oxidant (the concentration of total residual oxidant determined immediately at the end of aeration) and the particle size distribution of suspended particulate matter were measured in the water samples.The results showed that different ozone concentration treatments caused significantly increase in the levels of ammonia nitrogen (NH⁺₄-N) and nitrate nitrogen (NO^-₃-N) contents in the water (P<0.05),with significant decrease in nitrite nitrogen (NO^-₂-N) level in the water column (P<0.05). There was significant decrease in total suspended solids (TSS) in the water (P<0.05) with different concentrations of ozone treatment, and the gradual increase in the removal rate of TSS with the elevated ozone concentration, with the maximum removal rate of 23.15% at ozone concentration of 2.5 mg/L. The size distribution of suspended particles in the water was found to be changed significantly after the ozone was put into the culture water, with gradual increase in the flocculation efficiency with the increase in ozone concentration, and the maximum flocculation efficiency of 33.61% at the ozone concentration of 2.5 mg/L.The findings indicated that ozone effectively removed nitrite nitrogen and flocculated suspended particles in the water.It is recommended that treatment of aquaculture waterbe conducted at the suitable ozone concentration of 1.5 mg/L for 4 min.

Key words： ozone suspended particulate matter culture water removal rate flocculation efficiency

Received: 24 April 2023

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	Articles by authors
	CHENG Xiangyu
	LIU Xingguo
	CHEN Zhe
	XIAO Shuwen
	PAN Hengfeng
	ZHANG Wang

Cite this article:

CHENG Xiangyu,LIU Xingguo,CHEN Zhe, et al. Flocculation and Fragmentation of Particulate Matter in Biofloc Culture Water by Ozone[J]. Fisheries Science, 2024, 43(5): 757-766.

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https://www.shchkx.com/EN/10.16378/j.cnki.1003-1111.23033 OR https://www.shchkx.com/EN/Y2024/V43/I5/757

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