The application of novel coagulant reagent (polyaluminium silicate chloride) for the post-treatment of landfill leachates

 
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The application of novel coagulant reagent (polyaluminium silicate chloride) for the post-treatment of landfill leachates

Zoumpoylis, Anastasios
Tzoupanos, N.D.
Zhao, Y.-C.

Relatively ‘‘old” (stabilized) landfill leachates are a special category of wastewaters, which are difficult to treat further, mainly due to their bio-refractory organic content (humic substances). In this study, coagulation–flocculation was examined as post-treatment method for the biologically pre-treated stabilized leachates. The purpose was to examine the coagulation performance of alternative coagulant agents, i.e. the composite coagulant polyaluminium silicate chloride. Composite coagulants with different Al to Si molar ratio and different preparation methods were tested. Their efficiency was evaluated by monitoring from turbidity and phosphate content, other parameters strongly correlated with the presence of organic matter, such as UV absorbance at 254 nm, COD and colour. The results suggest that the silicabased coagulants exhibit better coagulation performance, than the relevant conventional coagulant(alum) or simple pre-polymerized coagulants (PACl). Polyaluminium silicate chloride has greater tolerance against pH variation than alum or PACl, whereas this novel coagulant works better at pH values between 7 and 9. Coagulation–flocculation has proved to be an efficient post-treatment method for the biologically pre-treated leachates, promoting the removal of the refractory humic substances, while the treatment efficiency of coagulation can be improved by the application of the new coagulant agent

Article / Άρθρο
info:eu-repo/semantics/article

Post-treatment
Coagulation
Polyaluminium silicate chloride
Stabilized leachates
Humic substances

Αριστοτέλειο Πανεπιστήμιο Θεσσαλονίκης (EL)
Aristotle University of Thessaloniki (EN)

Αγγλική γλώσσα

2008
2009-06-29T17:00:18Z


Αριστοτέλειο Πανεπιστήμιο Θεσσαλονίκης, Σχολή Θετικών Επιστημών, Τμήμα Χημείας

urn:ISSN:00456535
Chemosphere, vol.73, no. 5 [2008] p.729-736 [Published Version]

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info:eu-repo/semantics/openAccess



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