Evaluation of toxicity and estrogenicity of the landfill-concentrated leachate during advanced oxidation treatment: chemical analyses and bioanalytical tools

Abstract

Landfill-concentrated leachate from membrane separation processes is a potential pollution source for the surroundings. In this study, the toxicity and estrogenicity potentials of concentrated leachate prior to and during UV-Fenton and Fenton treatments were assessed by a combination of chemical (di (2-ethylhexyl) phthalate and dibutyl phthalate were chosen as targets) and biological (Daphnia magna, Chlorella vulgaris, and E-screen assay) analyses. Removal efficiencies of measured di (2-ethylhexyl) phthalate and dibutyl phthalate were more than 97 % after treatment with the two methods. Biological tests showed acute toxicity effects on D. magna tests in untreated concentrated leachate samples, whereas acute toxicity on C. vulgaris tests was not observed. Both treatment methods were found to be efficient in reducing acute toxicity effects on D. magna tests. The E-screen test showed concentrated leachate had significant estrogenicity, UV-Fenton and Fenton treatment, especially the former, were effective methods for reducing estrogenicity of concentrated leachate. The EEQchem (estradiol equivalent concentration) of all samples could only explain 0.218-5.31 % range of the EEQbio. These results showed that UV-Fenton reagent could be considered as a suitable method for treatment of concentrated leachate, and the importance of the application of an integrated (biological + chemical) analytical approach for a comprehensive evaluation of treatment suitability.

Household waste and health risks affecting waste pickers and the environment in low- and middle-income countries

“…Improper disposal of waste creates and disseminates pathogens which can quickly spread among human and animal populations in the city. High-concentrated leachate potentially causes environmental threats affecting ground water and surrounding environments [89]. There is also the risk of explosion and fire due to the production of methane gas on landfilling sites [88].…”

Ecotoxicological evaluation of electrochemical oxidation for the treatment of sanitary landfill leachates

“…Such fluctuation in toxicity, particularly the increase after EO treatments, is well described in the literature. Wang et al (2016) when testing the acute toxicity of a leachate towards D. magna, after Fenton treatment, obtained a significant increase in toxicity. The authors suggested that the toxicity of the intermediate products initially formed was probably greater than that of the primary pollutant.…”

Determination of optimal method for management of leachate membrane concentrate by analytical hierarchy process

“…Bu nedenle OH•, O2−• ve HO2• gibi yüksek reaktif radikallerin kullanıldığı ileri arıtım yöntemleri (İOP) biyolojik olarak parçalanamayan organik maddelerin giderilmesinde ve sızıntı suyu konsantresinin biyolojik olarak parçalanabilirliğini arttırmada ilgi çekici yöntemlerdir [10], [19]. Sızıntı suyunun ileri arıtım yöntemleri ile arıtımında ozon oksidasyonu [26], Fenton oksidasyonu [11], UV/Fenton [7], elektrokimyasal oksidasyon [1], elektro koagülasyon [8] gibi birçok yöntem denenmiştir. İleri oksidasyon proseslerinin işletme maliyeti giren akımın karakteristiği ile etkilenir [5].…”

“…Günümüzde, atık su arıtım tekniklerinin ve işlemlerinin neredeyse tamamı sızıntı suyuna uygulanmıştır [5]. Sızıntı suyu arıtma işlemleri dört farklı tipte gruplandırılabilir: (1) sızıntı suyu geri devri, (2) kentsel atık sularıyla birleşik arıtma, (3) aerobik ve anaerobik biyolojik işlemler ve (4) sedimantasyon/yüzdürme, havada sıyırma, adsorpsiyon, kimyasal çökelme ve oksidasyon gibi kimyasal ve fiziksel yöntemler [6], [7]. Sızıntı suyunun hacim ve kompozisyonundaki değişim bu suyun klasik arıtım yöntemleri (aerobik ve anaerobik biyolojik arıtım, kimyasal çöktürme, ozon, hidrojen peroksit veya UV ile oksidasyon ve aktif karbon adsorbsiyonu gibi fizikokimyasal arıtım) ile etkili bir arıtımını engeller.…”