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2009 | 43 | 16 | 4079-4091
Tytuł artykułu

Removal of refractory compounds from stabilized landfill leachate using an integrated H2O2 oxidation and granular activated carbon (GAC) adsorption treatment

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Abstrakt, słowa kluczowe
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Bibliografia
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Języki publikacji
EN
Abstrakty
EN
This study investigated the treatment performances of H 2 O 2 oxidation alone and its combination with granular activated carbon (GAC) adsorption for raw leachate from the NENT landfill (Hong Kong) with a very low biodegradability ratio (BOD 5 /COD) of 0.08. The COD removal of refractory compounds (as indicated by COD values) by the integrated H 2 O 2 and GAC treatment was evaluated, optimized and compared to that by H 2 O 2 treatment alone with respect to dose, contact time, pH, and biodegradability ratio. At an initial COD concentration of 8000mg/L and NH 3 -N of 2595mg/L, the integrated treatment has substantially achieved a higher removal (COD: 82%; NH 3 -N: 59%) than the H 2 O 2 oxidation alone (COD: 33%; NH 3 -N: 4.9%) and GAC adsorption alone (COD: 58%) at optimized experimental conditions (p≤0.05; t-test). The addition of an Fe(II) dose at 1.8g/L further improved the removal of refractory compounds by the integrated treatment from 82% to 89%. Although the integrated H 2 O 2 oxidation and GAC adsorption could treat leachate of varying strengths, treated effluents were unable to meet the local COD limit of less than 200mg/L and the NH 3 -N of lower than 5mg/L. However, the integrated treatment significantly improved the biodegradability ratio of the treated leachate by 350% from 0.08 to 0.36, enabling the application of subsequent biological treatments for complementing the degradation of target compounds in the leachate prior to their discharge.
Czasopismo
Water Research , ISSN 00431354
Rocznik
Tom
43
Numer
16
Strony
4079-4091
Opis fizyczny
Bibliografia
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Kolekcja
Elsevier
Identyfikator YADDA
bwmeta1.element.elsevier-e41aa41a-6197-3f17-ac1f-db9516588b3f
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