Effective nutrient removal from aquaculture wastewater utilizing an indoor nutrient film technique hydroponic system

IF 1.5 Q4 ENGINEERING, ENVIRONMENTAL Environmental Quality Management Pub Date : 2024-05-29 DOI:10.1002/tqem.22262

M. Rajalakshmi, K. Gunasekaran

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Abstract

Aquaculture wastewater treatment must remove nutrients to prevent eutrophication of receiving waters and to allow for possible re-use of the treated water. This study aims to evaluate the shoot and root growth of crops produced in Nutrient Film Technique hydroponic systems and treat aquaculture wastewater using phytoremediation. The average physico-chemical parameters of the aquaculture wastewater during the study period were pH 6–6.4, temperature 25°C–27°C, EC 0.7–0.8 mS/cm, and total dissolved solids (420–560 ppm). The operating conditions of hydroponic treatment units were hydraulic loading rate of 857.28 m/day, hydraulic retention time of 0.3 h, organic loading rate of 12567.8 Ibs-BOD₅/ft^2/day (BOD₅ is 5 – day Biochemical Oxygen Demand) and flow rate of 54 L/h. The study found that the average elimination efficiency of nitrate-nitrogen in aquaculture wastewater treatment varied from 78.28% by Money plants (Epiprennum aureum), 71% by Crotons (Codiaeum varigatum), 70.25% by Arrowhead plants (Syngonium podophyllum), 67.25% by Purple Heart (Tradescantia pallida), 68.62% by for Spinach (Spinacea oleracia), and 42.85% by Brinjal plants (Solanum melongena). The average removal effectiveness of BOD₅ varied from 71.07% by Money plants (Epiprennum aureum), 68.62% by Crotons (Codiaeum varigatum), 78% by Arrowhead plants (Syngonium podophyllum), 72% by Purple Heart (Tradescantia pallida), 68% by Spinach (Spinacea oleracia), and 70% by Brinjal plants (Solanum melongena). Thus, environmentally friendly and economically advantageous method for reducing and removing nitrate-nitrogen and BOD₅ from aquaculture effluent is hydroponic phytoremediation.

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利用室内营养膜技术水培系统有效去除水产养殖废水中的营养物质

水产养殖废水处理必须去除营养物质，以防止受纳水体富营养化，并使处理后的水有可能再利用。本研究旨在评估在营养膜技术水培系统中生产的作物的芽和根的生长情况，并利用植物修复技术处理水产养殖废水。研究期间，水产养殖废水的平均理化参数为 pH 6-6.4、温度 25°C-27°C、EC 0.7-0.8 mS/cm、溶解性总固体（420-560 ppm）。水耕法处理单元的运行条件为：水力负荷率为 857.28 米/天，水力停留时间为 0.3 小时，有机负荷率为 12567.8 Ibs-BOD5/ft^2/天（BOD5 为 5 - 天生化需氧量），流量为 54 升/小时。研究发现，在水产养殖废水处理中，金钱草（Epiprennum aureum）对硝酸盐氮的平均去除率为 78.28%，克罗顿草（Codiaeum varigatum）为 71%，箭毒草（Arrowhead plants）为 70.25%。25%、紫心（Tradescantia pallida）67.25%、菠菜（Spinacea oleracia）68.62%、菠菜（Solanum melongena）42.85%。金钱草（Epiprennum aureum）对 BOD5 的平均去除率为 71.07%，克罗顿草（Codiaeum varigatum）为 68.62%，箭毒草（Syngonium podophyllum）为 78%，紫心草（Tradescantia pallida）为 72%，菠菜（Spinacea oleracia）为 68%，黑木耳（Solanum melongena）为 70%。因此，水耕植物修复法是减少和去除水产养殖废水中硝酸盐氮和 BOD5 的既环保又经济的方法。

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来源期刊

Environmental Quality Management Environmental Science-Management, Monitoring, Policy and Law

CiteScore

2.20

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0.00%

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期刊介绍： Four times a year, this practical journal shows you how to improve environmental performance and exceed voluntary standards such as ISO 14000. In each issue, you"ll find in-depth articles and the most current case studies of successful environmental quality improvement efforts -- and guidance on how you can apply these goals to your organization. Written by leading industry experts and practitioners, Environmental Quality Management brings you innovative practices in Performance Measurement...Life-Cycle Assessments...Safety Management... Environmental Auditing...ISO 14000 Standards and Certification..."Green Accounting"...Environmental Communication...Sustainable Development Issues...Environmental Benchmarking...Global Environmental Law and Regulation.