Aquaculture wastewater quality improvement by floating raft of native aquatic plants in An Giang province, Vietnam

Nguyen, Khanh Tran Thien and Vo, Chi Thi Dao and Ngo, An Thuy and Doan, Nghi Thanh and Huynh, Luyen Phuc and Tran, Dung Huynh Thuy (2023) Aquaculture wastewater quality improvement by floating raft of native aquatic plants in An Giang province, Vietnam. Pertanika Journal of Science & Technology (Malaysia), 31 (2). pp. 729-758. ISSN 2231-8526

The development of aquaculture in An Giang province posed a risk of lowering the surface water quality of the Mekong River. This study assessed the pollution level of surface water affected by aquaculture areas in the province and the efficiency of the floating raft of native aquatic plants on aquaculture wastewater quality improvement. Water samples were analyzed for SS, COD, BOD₅, N-NH₄⁺, Total N, and Total P. The Water Quality Index was calculated according to the Vietnamese technical guidelines (VN_WQI). The quadrat method was applied to determine the density of aquatic plants. The result showed that surface water quality affected by aquaculture areas in An Giang province did not meet national standards, and the WQI ranged from heavy to good pollution. Experimental results showed that when using the treatment tank, including floating rafts of Water hyacinth (Eichhornia crassipes), Morning glory plants (Ipomoea aquatica), and Climbing dayflower (Commelina diffusa), the removal percentages of SS, COD, BOD₅, N-NH₄⁺, Total N, and Total P were 92.6%, 89.6%, 93.9%, 93.4%, 64.3%, and 94.6%, respectively, in the first three months of the farming season. The removal percentages of SS, COD, BOD₅, N-NH₄⁺, Total N, and Total P were 92.7%, 89.9%, 91.5%, 93.6%, 67.8%, and 94%, respectively, in the fourth month until fish harvest in the treatment tank. Therefore, floating rafts of native aquatic plants could absorb nutrients and quickly remove pollutants. The quality of aquaculture wastewater after treatment was significantly improved.

Full text available from: Official URL: http://www.pertanika.upm.edu.my/resources/files/Pe...

Abstract

The development of aquaculture in An Giang province posed a risk of lowering the surface water quality of the Mekong River. This study assessed the pollution level of surface water affected by aquaculture areas in the province and the efficiency of the floating raft of native aquatic plants on aquaculture wastewater quality improvement. Water samples were analyzed for SS, COD, BOD₅, N-NH₄⁺, Total N, and Total P. The Water Quality Index was calculated according to the Vietnamese technical guidelines (VN_WQI). The quadrat method was applied to determine the density of aquatic plants. The result showed that surface water quality affected by aquaculture areas in An Giang province did not meet national standards, and the WQI ranged from heavy to good pollution. Experimental results showed that when using the treatment tank, including floating rafts of Water hyacinth (Eichhornia crassipes), Morning glory plants (Ipomoea aquatica), and Climbing dayflower (Commelina diffusa), the removal percentages of SS, COD, BOD₅, N-NH₄⁺, Total N, and Total P were 92.6%, 89.6%, 93.9%, 93.4%, 64.3%, and 94.6%, respectively, in the first three months of the farming season. The removal percentages of SS, COD, BOD₅, N-NH₄⁺, Total N, and Total P were 92.7%, 89.9%, 91.5%, 93.6%, 67.8%, and 94%, respectively, in the fourth month until fish harvest in the treatment tank. Therefore, floating rafts of native aquatic plants could absorb nutrients and quickly remove pollutants. The quality of aquaculture wastewater after treatment was significantly improved.

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Item Type:	Article
AGROVOC Term:	water quality
AGROVOC Term:	wastewater aquaculture
AGROVOC Term:	water pollution
AGROVOC Term:	surface water
AGROVOC Term:	wastewater treatment
AGROVOC Term:	water sampling
AGROVOC Term:	experimentation
AGROVOC Term:	aquatic plant cultivation
AGROVOC Term:	wastewater management
AGROVOC Term:	nature conservation
Geographical Term:	Vietnam
Uncontrolled Keywords:	Aquaculture wastewater, Commelina diffusa, Eichhornia crassipes, floating raft, Ipomoea aquatica, wastewater treatment, water quality
Depositing User:	Ms. Azariah Hashim
Date Deposited:	27 Jan 2025 01:40
Last Modified:	27 Jan 2025 02:28
URI:	http://webagris.upm.edu.my/id/eprint/1887

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