Review article

Pilot project – recycling sludge from wastewater treatment plants in concrete products used in water managment

Domagoj Nakić orcid.org/0000-0003-1747-5451 ; WYG savjetovanje d.o.o., Zagreb, Croatia
Dražen Vouk ; Faculty of Civil Engineering, University of Zagreb, Zagreb, Croatia
Suzana Hozmec ; Beton Lučko, d.o.o., Zagreb, Croatia
Nina Štirmer ; Faculty of Civil Engineering, University of Zagreb, Zagreb, Croatia

Abstract

Considering the positive results of a laboratory testing of potential uses of ash obtained by sludge incineration from wastewater treatment plants (WWTPs) as cement replacement, the need arose for further testing of the production of concrete products in actual size. The pilot project was a result of the cooperation between the Faculty of Civil Engineering of the Zagreb University and the company Beton Lučko d.o.o. The ash obtained by sludge incineration in controlled laboratory conditions was used as a replacement for 10 % of cement in hexagonal prisms that are directly used in water management. In this manner, the closed circle meant the achievement of the basic principles of circular economy, since the ash generated as a byproduct of sludge incineration from wastewater treatment is used in concrete products utilized, among others, in the construction of water management facilities. The paper contains the chemical compositions of the obtained ashes, potential environmental imapcts tested through leaching from ash and concrete containing ash as well as the test results of technical requirements for finished concrete products according to the standards and established practice in the partner company.

Keywords

wastewater treatment plants; sludge; ash; water managment; concrete

Hrčak ID:

205807

URI

https://hrcak.srce.hr/205807

Publication date:

7.9.2018.

Article data in other languages: croatian

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