TY - JOUR
T1 - Characterization and treatment of landfill leachates by electro-Fenton process: A case study in Algeria
AU - Rouidi, Lina M.
AU - Maurício, Rita
AU - Boukhrissa, Athir
AU - Ait-Amar, Hamid
AU - Balamane, Ouafia
N1 - This work was supported by the following: The LSGPI Research Unit, University of Sciences and Technology Houari Boumediene, USTHB, Algiers, Algeria.
The Portuguese Government (FCT) through the research unit CENSE (UID/AMB/04085/2019), financed by FCT/MCTES.
The mobility project for higher education students and staff/Erasmus +/ 2017.
PY - 2020/1/1
Y1 - 2020/1/1
N2 - The feasibility of the electro-Fenton (EF) process to improve the biodegradability of Algerian leachates was examined, in order to prepare this kind of flux for conventional biological treatment. This work also included, for the first time in Algeria, the control and monitorization of a landfill—the “Hamici” landfill. Several physicochemical parameters were determined allowing its classification into an intermediate degradation phase, namely considering their alkaline pH (8.7), high ammonium concentration (3,120 mg/L), low content in heavy metals, and biodegradability (BOD5/COD = 0.22). The effects of important parameters such as current intensity, treatment time, and temperature on COD removal have been studied and optimized by using response surface analysis of a central composite design, where 91.1% of COD was removed with a treatment time of 285 min, a current intensity of 3 A, and a temperature of 20°C. A biodegradability test, which was performed on a solution electrolyzed with 120 min, 2 A, and 20°C, allowed to improve the leachates biodegradability from 0.2 to 0.42, with a removal rate of COD and TOC of 53.35% and 34.5%, respectively. However, the current efficiency declined from 137% to 76.6% when the current intensity was rise from 0.5 to 2 A. These results showed the relevance of EF process applied on raw intermediate leachates and its possible benefit in the Algiers leachates treatment processes. Thus, it was concluded that biological treatment can be combined with EF process for optimal mineralization of leachates with clear advantages in this studied location. Practitioner points: Characterization and treatment of leachates by electro-Fenton (EF) process were carried out. The leachates are intermediate type and therefore biologically recalcitrant. The operating parameter for EF process were modeled and optimized by the central composite design. Current intensity of 2 A reduces COD and TOC of 53.35% and 34.5%, respectively. The ratio BOD5/COD increased from 0.2 to 0.42 after 120 min of electrolysis time.
AB - The feasibility of the electro-Fenton (EF) process to improve the biodegradability of Algerian leachates was examined, in order to prepare this kind of flux for conventional biological treatment. This work also included, for the first time in Algeria, the control and monitorization of a landfill—the “Hamici” landfill. Several physicochemical parameters were determined allowing its classification into an intermediate degradation phase, namely considering their alkaline pH (8.7), high ammonium concentration (3,120 mg/L), low content in heavy metals, and biodegradability (BOD5/COD = 0.22). The effects of important parameters such as current intensity, treatment time, and temperature on COD removal have been studied and optimized by using response surface analysis of a central composite design, where 91.1% of COD was removed with a treatment time of 285 min, a current intensity of 3 A, and a temperature of 20°C. A biodegradability test, which was performed on a solution electrolyzed with 120 min, 2 A, and 20°C, allowed to improve the leachates biodegradability from 0.2 to 0.42, with a removal rate of COD and TOC of 53.35% and 34.5%, respectively. However, the current efficiency declined from 137% to 76.6% when the current intensity was rise from 0.5 to 2 A. These results showed the relevance of EF process applied on raw intermediate leachates and its possible benefit in the Algiers leachates treatment processes. Thus, it was concluded that biological treatment can be combined with EF process for optimal mineralization of leachates with clear advantages in this studied location. Practitioner points: Characterization and treatment of leachates by electro-Fenton (EF) process were carried out. The leachates are intermediate type and therefore biologically recalcitrant. The operating parameter for EF process were modeled and optimized by the central composite design. Current intensity of 2 A reduces COD and TOC of 53.35% and 34.5%, respectively. The ratio BOD5/COD increased from 0.2 to 0.42 after 120 min of electrolysis time.
KW - advanced oxidation process
KW - characterization
KW - electro-Fenton process
KW - Hamici landfill in Algiers
KW - landfill leachates
UR - http://www.scopus.com/inward/record.url?scp=85072019126&partnerID=8YFLogxK
U2 - 10.1002/wer.1223
DO - 10.1002/wer.1223
M3 - Article
C2 - 31502367
AN - SCOPUS:85072019126
SN - 1061-4303
VL - 92
SP - 123
EP - 137
JO - Water Environment Research
JF - Water Environment Research
IS - 1
ER -
