Characterization of Effluent Water Quality from Hydroponic Cultivation System

Q3 Environmental Science

Journal of Water and Environment Technology Pub Date : 2021-01-01 DOI:10.2965/JWET.20-096

H. Nagare, Youhei Nomura, Kenta Nakanishi, S. Akao, T. Fujiwara

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引用次数: 1

Abstract

Hydroponics, a soilless cultivation system, has received attention because of its application in industry and being thought as the option to support the increased world population by increasing crop yields with less water. A highly concentrated nutrient solution is used in the system; this solution is discharged after use because the composition becomes imbalanced, and hazardous substances and pathogens may accumulate. Water quality surveys were conducted to identify the characteristics of the hydroponic effluent, which has not been previously documented. Twenty-one effluents were collected from 16 facilities in Kochi, Japan. The concentrations of nutrients varied significantly: i.e. 9.8–526 mg N/L of nitrate, and 3.0–131 mg P/L of phosphorus. Statistical analysis revealed five properties that explained the variation in the effluents. Mass balances of nutrients were evaluated in a facility raising eggplant. The efficiencies of the nutrient investment in hydroponics seemed higher than those in soil cultivation systems: 34–41 moles (478–572 mg N) of nitrogen and 1.1–5.9 moles (35–184 mg P) of phosphorus were discharged during the cultivation of 1 tonne of eggplant.

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水培系统出水水质的表征

水培法是一种无土栽培系统，由于其在工业上的应用而受到关注，并被认为是通过减少水来提高作物产量来支持不断增长的世界人口的选择。系统中使用高浓度营养液;该溶液使用后因成分不平衡，可能积聚有害物质和病原体而排出。进行了水质调查，以确定水培废水的特征，这在以前没有记录。从日本高知的16个设施收集了21个污水。营养物浓度变化显著，硝酸盐浓度为9.8 ~ 526 mg N/L，磷浓度为3.0 ~ 131 mg P/L。统计分析揭示了五个特性，解释了污水的变化。在茄子养殖设施中，对营养物质的质量平衡进行了评价。水培系统的养分投入效率高于土壤栽培系统:每吨茄子的氮肥排放量为34 ~ 41摩尔(478 ~ 572 mg N)，磷排放量为1.1 ~ 5.9摩尔(35 ~ 184 mg P)。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Journal of Water and Environment Technology Environmental Science-Water Science and Technology

CiteScore

1.80

自引率

0.00%

发文量

审稿时长

43 weeks

期刊介绍： The Journal of Water and Environment Technology is an Open Access, fully peer-reviewed international journal for all aspects of the science, technology and management of water and the environment. The journal’s articles are clearly placed in a broader context to be relevant and interesting to our global audience of researchers, engineers, water technologists, and policy makers. JWET is the official journal of the Japan Society on Water Environment (JSWE) published in English, and welcomes submissions that take basic, applied or modeling approaches to the interesting issues facing the field. Topics can include, but are not limited to: water environment, soil and groundwater, drinking water, biological treatment, physicochemical treatment, sludge and solid waste, toxicity, public health and risk assessment, test and analytical methods, environmental education and other issues. JWET also welcomes seminal studies that help lay the foundations for future research in the field. JWET is committed to an ethical, fair and rapid peer-review process. It is published six times per year. It has two article types: Original Articles and Review Articles.