Journal of Applied Science and Engineering

Published by Tamkang University Press

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Environmental Engineering

Supanut Thiebkhun1,#, Sumeth Wongkiew2,3,#, Tharinee Saleepochn4, and Pongsak (Lek) Noophan1This email address is being protected from spambots. You need JavaScript enabled to view it.

1Department of Environmental Engineering, Faculty of Engineering, Kasetsart University, Bangkok, Thailand

2Department of Environmental Science, Faculty of Science, Chulalongkorn University, Bangkok, Thailand

3Water Science and Technology for Sustainable Environment Research Unit, Chulalongkorn University, Bangkok 10330, Thailand

4Department of Chemistry, Faculty of Science, Kasetsart University, Bangkok 10900, Thailand

#The authors contributed equally to this work

 

 

Received: January 15, 2024
Accepted: February 19, 2024
Publication Date: February 27, 2024

 Copyright The Author(s). This is an open access article distributed under the terms of the Creative Commons Attribution License (CC BY 4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are cited.


Download Citation: ||https://doi.org/10.6180/jase.202412_27(12).0011  


Amid food, nutrient, and wastewater crises, this study investigated struvite (NH4MgPO4 ·6H2O) derived from domestic wastewater as a sustainable solution, utilizing it in hydroponic systems for lettuce production. The research synthesized and compared struvite from both synthetic and real domestic wastewater and assessed its nutrient uptake efficiency across three phases: I) hydroponics without struvite, II) hydroponics with synthetic struvite, and III) hydroponics with struvite from domestic wastewater. Results reveal that struvite from domestic wastewater exhibited a structure similar to synthetic struvite, with an efficient phosphate removal efficiency (90.3%) but without ammonium removal from urine due to the hydrolysis of urea in the wastewater. In Phase I, hydroponic solutions without struvite showed low phosphorus concentrations (1.5 and 4.0 mgP/L). Adding 0.5 g and 1.0 g of chemically synthesized struvite per liter in Phase II significantly increased phosphate levels to 43.9 and 78.9 mgP/L, respectively, demonstrating the effectiveness of struvite in enhancing phosphorus availability. Phase III revealed that struvite from real domestic wastewater released significantly more phosphate (67.2 mgP/L) compared to synthetic struvite (35.7 mgP/L), suggesting the potential of using domestic wastewaterderived struvite for enhanced nutrient supplementation. The supplementation of struvite in hydroponics increased phosphate but not nitrate levels in the hydroponic water. Hydroponic systems supplemented with synthetic and domestic wastewater struvite yielded 1,350.0 and 1,265.3 grams per system (12 heads) respectively, surpassing yields from systems without struvite. Phosphorus and nitrogen use efficiencies for synthetic struvite were 1.8% and 33.9%, and for domestic wastewater struvite 1.9% and 26.0%, respectively. Additionally, struvite sources affected microbial communities, with synthetic struvite favoring nitrifying bacteria (e.g., Nitrospira, Nitrobacter) and domestic struvite promoting microbes associated with organic nutrients (e.g., Altererythrobacter, Litorilinea, Armatimonas). These findings highlight the potential of using domestic wastewater-derived struvite in hydroponics as a sustainable nutrient recovery method, contributing to sustainable agriculture and the circular economy.


Keywords: Bioponic; Domestic wastewater; Microbial community; Nitrogen recovery; Phosphorus recovery; Struvite


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