Long-term landﬁll leachate exposure modulates antioxidant responses and causes cyto-genotoxic effects in Eisenia andrei earthworms

Sales, Sidney Fernandes; Amaral, Isabele Campos Costa; Mannarino, Camille Ferreira; Hauser‐Davis, Rachel Ann; Correia, Fábio Veríssimo; Saggioro, Enrico Mendes

doi:10.1016/j.envpol.2021.117351

Cited by 15 publications

(1 citation statement)

References 69 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…employed potassium ferrate (K 2 FeO 4 ) for leachate treatment and reported increased removal of COD, from 61.7% to 70%. [ 28 34 ] Iron is usually found in the oxidation states of Fe 2+ and Fe 3+ , and it can be converted to a higher oxidizing state (Fe 6+ ) under strong oxidation conditions. One of the prominent features of this process is the production of ferric or ferric hydroxide as a coagulant in the form of ferric oxide or ferric hydroxide.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of chemical oxygen demand and color removal from leachate using coagulation/flocculation combined with advanced oxidation process

et al. 2022

View full text Add to dashboard Cite

Background: One of the basic practices in the field of waste management is the collection and treatment of leachate. Leachate from municipal waste due to high chemical oxygen demand (COD) and dark color is a potential pollutant of the environment, which causes a lot of problems in the absence of treatment and direct discharge to the environment. This study aimed to determine the efficiency of ultrasonic process in combination with coagulation and flocculation process using sodium ferrate in COD and color reduction. Materials and Methods: In this experimental study, all experiments were performed in batch conditions and with changing process variables such as pH and sonication time, and the effect of three parameters, including ultrasonic reaction time (15, 30, and 45 min), pH (2, 4, 5/5, and 7), and coagulant dosage (from 1 to 150 g/l) on the COD reduction and color removal, was evaluated. Coagulant concentration and then the removal efficiency of COD and color were analyzed by ANOVA using SPSS 18. Results: The COD reduction and color removal were 87.05% and 88.6% in optimal condition (using 120 g/L of sodium ferrate at pH 5.5), with coagulation/flocculation, after ultrasound (15 min). Ultrasound (15 min) + sodium ferrate (without coagulation/flocculation) achieved 46.25% of COD reduction and 90.35% of color elimination, whereas the ultrasonic process alone allowed removing the COD and color in the leachate by less than 50%. Conclusion: The results indicate that C–F followed by ultrasonic can be used to efficiently reduce the organic matter and color from municipal waste leachate, and it would be an ideal option for leachate treatment.

show abstract

Section: Introductionmentioning

confidence: 99%