Manual Treatment of Urban Wastewater by Chemical Precipitation for Production of Hydroponic Nutrient Solutions

An urban wastewater treatment system was developed in Portugal for posterior in situ feasibility testing at the Bulgarian Antarctic Base, using its domestic wastewater. The aim of this system was the development of a low cost, integrated approach for wastewater treatment and production of nutrient s...

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Bibliographic Details
Published in:Journal of Ecological Engineering
Main Authors: Tânia Correia, Mariana Regato, Adelaide Almeida, Teresa Santos, Leonor Amaral, Maria de Fátima Nunes Carvalho
Format: Article in Journal/Newspaper
Language:English
Published: Polish Society of Ecological Engineering (PTIE) 2020
Subjects:
urban wastewater
antarctica
chemical precipitation
co2 capture
hydroponics
Environmental technology. Sanitary engineering
TD1-1066
Environmental sciences
GE1-350
Antarctic
Antarc*
Antarctica
Online Access:https://doi.org/10.12911/22998993/118286
https://doaj.org/article/0d2f75c8f0a54d309b64fa2407268bed
Description
Summary:An urban wastewater treatment system was developed in Portugal for posterior in situ feasibility testing at the Bulgarian Antarctic Base, using its domestic wastewater. The aim of this system was the development of a low cost, integrated approach for wastewater treatment and production of nutrient solutions (NS) for hydroponic cultivation of lettuce (Lactuca sativa var. crispa) in Antarctic stations, or any other place where lack of resources and logistical hardships make wastewater treatment and reuse impractical. The wastewater treatment system consisted in manual agitation lime chemical precipitation (LCPm) and effluent natural neutralization (NN) by atmospheric CO2 carbonation reactions (with and without air injection). The resulting effluent/NS had macronutrient values (nitrogen and phosphorous) for the hydroponic cultivation of lettuce bellow the values of commercial NS and a high pH (pH ≈ 8). The treatment achieved a total coliform removal rate of 100%. Before the LCPm treatment system development several lime-based reagents, under different reaction pHs and using mechanical agitation, were tested to access their organic matter removal efficiency, as chemical oxygen demand (COD). The best results obtained were: commercial Ca(OH)2 (pH 11.5 - 89%), reagent grade Ca(OH)2 (pH 11.5 - 79%) and CaO (pH 12.0 - 64%).

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