PL EN
Benefits and Risks of Liquid Sewage Sludge Recycling in Agricultural Spreading – A Case Study of WWTP of Skhirat, Morocco
 
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1
Laboratory of Spectroscopy, Molecular Modelling, Materials, Nanomaterials, Water and Environment, CERN2D, ENSAM, Mohammed V University in Rabat, 10100 Morocco
2
National Laboratory for Studies and Pollution Monitoring-Ministry of Energy, Mines and Environment, Department of Environment, Rabat, Morocco
3
Resources Valorization, Environment and Sustainable Development Research Team (RVESD), Department of Mines, Mines School of Rabat, Ave Hadj Ahmed Cherkaoui – BP 753, Agdal, Rabat, 53000 Morocco
4
Laboratory of microbiology, Faculty of Medicine and Pharmacy Rabat, Mohammed V University, Rabat, Morocco
AUTOR DO KORESPONDENCJI
Abdelmajid Achkir   

Laboratory of Spectroscopy, Molecular Modelling, Materials, Nanomaterials, Water and Environment, CERN2D, ENSAM, Mohammed V University in Rabat, 10100 Morocco
 
J. Ecol. Eng. 2023; 24(1):277–288
 
SŁOWA KLUCZOWE
DZIEDZINY
 
STRESZCZENIE
The sewage sludge recycling as an agricultural land resource has received a great deal of attention worldwide. This practice is highly increased because of ever-increasing municipal wastewater production and the awareness of its fertilizing potential as an amendment resources. However, there is concern about land spreading linked mainly to health associated risks due to the presence of diverse pollutants. Thus, sewage spreading management is a key factors the guarantee benefits and avoid risks. The present work aims to investigate the benefits and risks of sewage sludge (SS) application on agricultural land. To this end, physicochemical main parameters and Bacteriological indicators, fecal coliform (FC) and fecal streptococcus (FS), of sewage sludge generated form WWTP of Skhirat, Morocco, were performed during the period 2018-2019. The obtained results of physicochemical parameters reveals high concentration of organic matter in SS which reach 96.3 mg/l, and in nutrients. Indeed, total Kjeldhal nitrogen TKN reach a maximum of 3791 mgN/l, Potassium K+ reach 58.71 mg/l. In addition, the medium content of CF and SF are respectively around 5.40 CFU/ml and 5.85 CFU/ml for SF.and Total Phosphorus PT reach 508.25 mg/l. In addition, concentrations of micronutrients such as Cl-, SO42-, Ca2+, Mg2+, and Na+ were high which is interesting and could benefit for both soils and plant. Furthermore, theses sewage sludge contains high concentration in heavy metals mainly Zinc and Copper which could be a limit of reuse in land spreading. The obtained results were compared to applied standards and directives established within the framework of the agricultural spreading.