Application of multiple toxicity tests in monitoring of landfill leachate treatment efficiency

Abstract

Leachate from a closed landfill used for co-disposal of municipal and tannery waste was submitted to coagulation treatment, air stripping, adsorption on granular activated carbon, and Fenton oxidation with the aim to reduce toxicity of the leachate. Optimal operational conditions for each process were identified. The performance of the treatment was monitored by determination of organic matter (COD, DOC, BOD5), inorganic components (N-NH4(+), Cl(-), alkalinity, metals), organic compounds (BTEX, PAHs, PCBs, OCPs) while changes in toxicity were followed by multiple toxicity tests. Among the applied treatment techniques, adsorption on granular activated carbon was the most efficient method for removal of organic matter and metals while air stripping was the most efficient for removal of N-NH4(+) and reduction of toxicity. Lower reduction of organic matter content and toxicity was obtained during coagulation treatment. Fenton oxidation was effective for removal of COD; however, it negatively affected toxicity reduction. The combination of adsorption on granular activated carbon and air stripping led to an appreciable reduction of organic and inorganic pollutants and to leachate detoxification. Application of bioassays was helpful for assessing suitability of treatment methods and demonstrated that they are, together with physicochemical parameters, an indispensable part for monitoring of treatment efficiency.

Evaluation of the Treatment Process of Landfill Leachate Using the Toxicity Assessment Method

“…A landfill operates like a massive anaerobic bioreactor which contains physically, chemically, and biologically heterogeneous systems [2]. Leachate is generated from landfill, which is caused by the percolation of rainwater and moisture mixed with the degradation of solid waste [3].…”

“…[2]. Advanced oxidation processes have proven to be an efficient method to degrade refractory organic pollutants, including ozone oxidation, photocatalytic oxidation, the Fenton method, the electrochemical oxidation method, and so on [12].…”

Evaluation of toxic potential of leachate originating from experimental landfill cells containing household waste and healthcare waste

“…According to the authors, both organisms showed high sensitivity to the leachate and the parameter of ammonia nitrogen present in the samples was pointed out as responsible for the mortality of the fish species studied. Kalčíková et al (2015) studied leachate from an old landfill site in Slovenia, that received MSW and tannery, which was closed more than 10 years previous. The ecotoxicity related to ammonia nitrogen and alkalinity was investigated by air stripping for test organisms Artemia salina, Sinapis alba and A. fischeri.…”

“…Kalčíková et al (2015) studied leachate from an old landfill site in Slovenia, that received MSW and tannery, which was closed more than 10 years previous. The ecotoxicity related to ammonia nitrogen and alkalinity was investigated by air stripping for test organisms Artemia salina, Sinapis alba and A. fischeri .…”

Διερεύνηση Του Μικροβιακού Πληθυσμού Και Της Βιοαποδομησιμότητας Διασταλαγμάτων

“…Ένας χώρος υγειονομικής ταφής απορριμμάτων είναι μια ετερογενής ενεργή κατασκευή που εντός της οικοδομείται ένας ογκώδης, αναερόβιος κυρίως, βιοανταδραστήρας (Kalčíková et al, 2015). Το διαστάλαγμα που παράγεται αποτελεί ένα υγρό απόβλητο με ιδιαίτερη πολυπλοκότητα που σχηματίζεται από την ροή βρόχινων υδάτων μέσα από το κύτταρο του Χ.Υ.Τ.Α., ακόμη και χρόνια έπειτα από τον τερματισμό λειτουργίας της εγκατάστασης (Laspidou & Rittmann, 2002: Metzger et al, 2007.…”