Publications by authors named "Abdessamad Hejjaj"

In Morocco, red fruit production has thrived, primarily utilizing hydroponic methods to control crops, increase fruit yield and quality, and avoid soil-related problems. However, the irrigation of these expansive hydroponic farms relies heavily on water sourced from dams, many of which are contaminated with Microcystins (MCs). To address this contamination issue, ongoing research is focused on discovering effective and cost-efficient biological solutions for eliminating MCs.

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Article Synopsis
  • Cyanobacterial harmful algal blooms (CyanoHABs) pose risks to public health and freshwater ecosystems, prompting a study on their dynamics and the movement of microcystins (MCs) from Lalla Takerkoust reservoir to nearby farms.
  • The research identified Microcystis and Synechococcus species as responsible for the blooms, with Microcystis producing significant levels of three MC variants, particularly MC-RR, while Synechococcus showed no toxin production.
  • Analysis revealed a historical pattern of cyanobacterial proliferation and indicated a significant decrease in MC concentrations as one moves downstream from the reservoir, emphasizing the influence of environmental factors and the necessity for effective bloom management.
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This paper evaluates the performance and potential of a full-scale hybrid multi-soil-layering (MSL) system for the treatment of domestic wastewater for landscape irrigation reuse. The system integrates a solar septic tank and sequential vertical flow MSL and horizontal flow MSL components with alternating layers of gravel and soil-based material. It operates at a hydraulic loading rate of 250 L/m/day.

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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.
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Microcystins (MCs) constitute a significant threat to human and environmental health, urging the development of effective removal methods for these toxins. In this review, we explore the potential of MC-degrading bacteria as a solution for the removal of MCs from water. The review insights into the mechanisms of action employed by these bacteria, elucidating their ability to degrade and thus remove MCs.

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The depletion of water resources has gained global attention, particularly in arid climates, where there is growing interest in reusing treated wastewater for irrigation. This study focuses on the impact of irrigating treated wastewater using a hybrid multi-soil-layering (MSL) technology on soil physicochemical properties and the agro-physiological characteristics of maize (Zea mays) cultivated in Morocco, a region characterized by arid conditions. To achieve this research goals, three plots were cultivated with Zea mays and subjected to irrigation with water of varying qualities: raw wastewater (RWW), treated wastewater (TWW), and well water (WW).

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This paper investigates the removal efficiency of organic matter, nitrogen, phosphorus, coliforms and pathogens from rural domestic wastewater in a two-stage vertical flow multi-soil-layering (MSL) system. The effects of wastewater quality, season and arid climate conditions on pollutants removal efficiency by the system were examined for one year. The experimental setup included two similar MSL systems composed of two layers: soil-mixture-layers (SML) and gravel permeable layers (PL) that are arranged in a brick like pattern.

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