AI Article Synopsis
- Eutrophication has caused toxic cyanobacterial blooms in the Lalla Takerkoust reservoir in Morocco, prompting a study to assess the effectiveness of Multi-Soil-Layering (MSL) ecotechnology in removing these blooms.
- Two MSL setups using different types of soil (sandy for MSL1 and clayey for MSL2) were tested, significantly lowering cyanobacterial concentrations and eliminating organic matter levels by over 95%.
- MSL1 demonstrated improved microcystin (MC) removal from 52% to 99%, while MSL2 began at 90% reduction but fluctuated before stabilizing at 86%, indicating both systems effectively tackle cyanobacterial contamination.
Article Abstract
Eutrophication has led to the widespread occurrence of cyanobacterial blooms. Toxic cyanobacterial blooms with high concentrations of microcystins (MCs) have been identified in the Lalla Takerkoust reservoir in Morocco. The objective of this study was to evaluate the efficiency of the Multi-Soil-Layering (MSL) ecotechnology in removing natural cyanobacterial blooms from the lake. Two MSL pilots were used in rectangular glass tanks (60 × 10 × 70 cm). They consisted of permeable layers (PLs) made of pozzolan and a soil mixture layer (SML) containing local soil, ferrous metal, charcoal and sawdust. The main difference between the two systems was the type of local soil used: sandy soil for MSL1 and clayey soil for MSL2. Both MSL pilots effectively reduced cyanobacterial cell concentrations in the treated water to very low levels (0.09 and 0.001 cells/mL). MSL1 showed a gradual improvement in MC removal from 52 % to 99 %, while MSL2 started higher at 90 % but dropped to 54% before reaching 86%. Both MSL systems significantly reduced organic matter levels (97.2 % for MSL1 and 95.8 % for MSL2). Both MSLs were shown to be effective in removing cyanobacteria, MCs, and organic matter with comparable performance.
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| http://dx.doi.org/10.1016/j.jhazmat.2024.134281 | DOI Listing |
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