Modified Biochar—A Tool for Wastewater Treatment

Global deposits of concentrated phosphates, which are a necessary source for the production of phosphate fertilizers, are limited. These reserves keep getting thinner, and every day, large amounts of phosphorus end up in watercourses. In this study, we verified that modified biochar (saturated with...

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Published in:Energies (Basel) 2020-10, Vol.13 (20), p.5270
Main Authors: Kopecký, Marek, Kolář, Ladislav, Konvalina, Petr, Strunecký, Otakar, Teodorescu, Florina, Mráz, Petr, Peterka, Jiří, Váchalová, Radka, Bernas, Jaroslav, Bartoš, Petr, Filipov, Feodor, Bucur, Daniel
Format: Article
Language:English
Subjects:
Adsorption
Agricultural production
Agrochemicals
biochar
Charcoal
Control
Crystallization
Developing countries
Distribution
Ecosystems
Eutrophication
Ferric chloride
fertilizer
Fertilizers
Fluidized bed reactors
Industrialized nations
Iron compounds
Iron phosphates
iron(III) phosphate
LDCs
Municipal wastewater
Phosphates
Phosphorus
Phosphorus removal
Precipitation
Purification
recycling
Sewage
Sludge
Sodium hydroxide
Struvite
Supply and demand
Wastewater facilities
Wastewater treatment
Wastewater treatment plants
Water quality
Water treatment
Watercourses
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Summary:Global deposits of concentrated phosphates, which are a necessary source for the production of phosphate fertilizers, are limited. These reserves keep getting thinner, and every day, large amounts of phosphorus end up in watercourses. In this study, we verified that modified biochar (saturated with FeCl3 solution and then neutralized with NaOH solution) can adsorb significant amounts of phosphorus from wastewater. Moreover, the agrochemical qualities of sludge water from a municipal wastewater treatment plant, struvite, phosphorus-saturated biochar, and iron(III) phosphate from a reused biochar filter were tested in this study. We determined the amount of mobile phosphorus as well as the amount of extractable phosphorus and its five fractions. It was found that modified biochar can hold one-third of the phosphorus amount contained in the commonly used agricultural fertilizer simple superphosphate (1 × 105 g of modified biochar captures up to 2.79 × 103 g of P). Moreover, plants can more easily access phosphorus biochar fractions than struvite, which is formed spontaneously during sludge management. The results of this research prove that the proposed method of recycling phosphorus from wastewater can be applied in technological practice.
ISSN:1996-1073
1996-1073
DOI:10.3390/en13205270