J 2019

Ferrous sludge from water clarification: Changes in waste management practices advisable

MAROUŠEK, Josef, Vojtěch STEHEL, Marek VOCHOZKA, Ladislav KOLÁŘ, Anna MAROUŠKOVÁ et. al.

Basic information

Original name

Ferrous sludge from water clarification: Changes in waste management practices advisable

Name in Czech

Železný kal z čištění vody: Doporučujeme změny v postupech nakládání s odpady

Authors

MAROUŠEK, Josef (203 Czech Republic, guarantor, belonging to the institution), Vojtěch STEHEL (203 Czech Republic, belonging to the institution), Marek VOCHOZKA (203 Czech Republic, belonging to the institution), Ladislav KOLÁŘ (203 Czech Republic, belonging to the institution), Anna MAROUŠKOVÁ (268 Georgia, belonging to the institution), Otakar STRUNECKÝ (703 Slovakia, belonging to the institution), Jiří PETERKA (203 Czech Republic), Marek KOPECKÝ (203 Czech Republic) and Sowmya SHREEDHAR (356 India, belonging to the institution)

Edition

Journal of Cleaner Production, England, Elsevier Ltd, 2019, 0959-6526

Other information

Language

English

Type of outcome

Článek v odborném periodiku

Field of Study

10511 Environmental sciences

Country of publisher

United Kingdom of Great Britain and Northern Ireland

Confidentiality degree

není předmětem státního či obchodního tajemství

References:

RIV identification code

RIV/75081431:_____/19:00001652

Organization unit

Institute of Technology and Business in České Budějovice

UT WoS

000462110400042

Keywords (in Czech)

Bioekonomie; Koagulační kal; Flokulace; Biologická dostupnost fosforu; Řízení procesů; Čištění vody

Keywords in English

Bioeconomy; Coagulation sludge; Flocculation; Phosphorus bioavailability; Process management; Water clarification

Tags

Změněno: 22/4/2020 15:10, Ing. Anna Palokha

Abstract

V originále

Clarification via floccules of ferric hydroxide is a globally leading technology in processing and treating surface water, and converting it into drinking water. The ferric–based coagulation sludge obtained is routinely dewatered and mixed with biowaste, assuming that the finest colloidal fractions of clay present will improve the cation–exchange capacity of the composts produced. However, in relation to the application of these types of compost, farmers repeatedly and independently of one another reported lower yields and crops suffering from phosphorus deficiency, even under proper phosphorus fertilization. A 5-year study revealed that the cation–exchange capacity tends to increase, which is beneficial over the long term. Nevertheless, the analyses performed revealed, for the first time, that this widespread practice lowers the level of mobile phosphorus, on average, by 62% and the level of extractable phosphorus by 55%. To make things worse, the quality of the extractable phosphorus declines, since the biologically available calcium, magnesium and aluminum based phosphates are gradually being replaced by ferric phosphates (originating from the ferric sludge). Given that phosphorus is the most expensive nutrient, this finding is of great environmental and economic importance, since the formation of ferric phosphates locks this most expensive nutrient into a form available neither to soil microbiota nor plants. It is recommended that new ways of using ferric–based coagulation sludge be developed.

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