AI Article Synopsis
- Landfill leachate, the liquid that comes from garbage, has harmful substances like ammonium and micropollutants (tiny pollutants).
- Researchers created a special system called an expanded clay aggregates packed biofilm column (EBC) that helps break down these harmful substances using a combination of natural processes and ozone treatment.
- After just over two months, they found that this method was super effective, achieving 85% nitrogen removal and completely getting rid of a specific micropollutant called carbamazepine.
Article Abstract
Landfill leachate contains ammonium and micropollutants. Ammonium can be biologically removed but bio-recalcitrant micropollutants removal requires post-treatment like ozonation. This study developed an expanded clay aggregates packed biofilm column (EBC) and demonstrated its feasibility of coupling biodegradation and ozonation (CBAO) to simultaneously remove nitrogen and bio-recalcitrant micropollutants. The first 60 days only had biodegradation process to start the bioreactor. 51 % nitrogen was biologically removed but the removal of micropollutant carbamazepine (CBZ) was only 30 %. From 61 d to 150 d, both biodegradation and ozonation were performed in the EBC. After 48 h-biodegradation, ozone gas was introduced and bubbling through EBC for 30 min to further remove residual micropollutants. At 0.4 gO/gCOD, CBZ were completely removed. The average nitrogen removal efficiency (85 %) was increased by 34 % because the increased abundance of nitrifying and denitrifying bacteria in EBC. This study confirmed the promising potential of the CBAO process for treating landfill leachte.
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| http://dx.doi.org/10.1016/j.biortech.2024.131413 | DOI Listing |
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