Natural composite adsorbent using alginate as binder aid for leachate treatment
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Date
2018-08-01
Authors
Awatif Md Isa
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Abstract
Generation of leachate is the biggest issue that caused negative impact to the environment due to high concentration of organic and inorganic materials. Adsorption is proven to be among the effective methods for leachate treatment. Therefore, this study examined the effectiveness of composite adsorbent producing from the mixture of powder activated carbon (PAC), powder limestone (PLS) and alginate (AG) to remove chemical oxygen demand (COD) and Fe(II) in leachate. The result indicated the best mix ratio (w/w) of the PAC-PLS and AG concentration were 7:3 and 2% w/v, respectively. Surface area of the composite adsorbent was 555.2 m2/g with average pore diameter 3.5 nm. In fact, the hydroxyl, carboxyl and alkene groups discovered on the surface of the composite adsorbent that enhanced the adsorption process. Next, from batch study, the best condition for leachate treatment is 16 g (composite adsorbent), pH 7 (initial pH), 200 rpm (shaking speed) and 150 min (contact time). According to the isotherm study, adsorption mechanism for COD can be described by Freundlich model (physisorption) while Fe(II) is particularly represented by Langmuir model (chemisorption). Meanwhile, through the kinetic study, the composite adsorbent was also found to obey pseudo-second-order model (chemisorption) for both parameters. All the models obtained the value of R2>0.9 and indicating that both physisorption and chemisorption processes occurred at the entire surface of composite adsorbent during adsorption process.