A two-step approach to recycling hydroponics waste nutrient solutions using fertiliser drawn forward osmosis and chemical precipitation

IF 5.4 Q1 ENVIRONMENTAL SCIENCES
Suhaib Malkawi , Dharmappa Hagare , Basant Maheshwari
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引用次数: 0

Abstract

Hydroponic waste nutrient solutions (HWNS) present significant environmental and economic challenges due to their high phosphorus content and potential for eutrophication. Addressing these issues requires innovative approaches that mitigate environmental impacts and recover valuable resources. This study introduces a novel two-step approach that combines Fertiliser Drawn Forward Osmosis (FDFO) and chemical precipitation to recycle HWNS effectively.
In the first phase, FDFO was employed to concentrate HWNS using a commercial hydroponic fertiliser as the draw solution. This process resulted in a diluted fertiliser solution (potentially suitable for reuse in hydroponics irrigation) and a concentrated HWNS rich in phosphorus. The concentrated HWNS was then subjected to chemical precipitation in the second phase, where phosphorus was recovered as calcium phosphate by adding sodium hydroxide at an optimised pH of 9.5.
Bench-scale experiments demonstrated a 93% water recovery rate using FDFO and an impressive 99.5% phosphorus removal efficiency through chemical precipitation. These results indicate that the combined FDFO and chemical precipitation processes effectively recover water and phosphorus from HWNS and reduce reliance on synthetic fertilisers and freshwater in hydroponic systems.
The findings of this study demonstrate that the two-step approach not only enhances water and phosphorus recovery but also improves the efficiency of the chemical precipitation process by achieving higher recovery rates resulting in more sustainable hydroponic systems.
利用肥料正向渗透法和化学沉淀法回收水培废弃营养液的两步法
水耕废料营养液(HWNS)由于含磷量高并可能造成富营养化,给环境和经济带来了巨大挑战。要解决这些问题,就必须采用创新方法,减轻对环境的影响并回收宝贵的资源。本研究介绍了一种新颖的两步法,该方法结合了肥料牵引正向渗透(FDFO)和化学沉淀法,可有效回收利用 HWNS。这一过程产生了稀释的肥料溶液(可能适合在水培灌溉中重复使用)和富含磷的浓缩 HWNS。然后,浓缩的 HWNS 在第二阶段进行化学沉淀,在最佳 pH 值为 9.5 的条件下加入氢氧化钠,以磷酸钙的形式回收磷。基准规模实验表明,使用 FDFO 的水回收率为 93%,通过化学沉淀的除磷效率为 99.5%,令人印象深刻。这些结果表明,FDFO 和化学沉淀相结合的工艺能有效回收 HWNS 中的水和磷,减少水培系统对合成肥料和淡水的依赖。这项研究的结果表明,两步法不仅能提高水和磷的回收率,还能提高化学沉淀工艺的效率,达到更高的回收率,从而实现更可持续的水培系统。
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
Resources, conservation & recycling advances
Resources, conservation & recycling advances Environmental Science (General)
CiteScore
11.70
自引率
0.00%
发文量
0
审稿时长
76 days
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