Use of offshore oil waste and sewage sludge in the production of organomineral fertilizers

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Large amounts of waste, such as those generated during offshore well drilling and sewage treatment, pose environmental challenges due to risks to human health and soil contamination when improperly disposed of. The present study aimed to evaluate the feasibility of using cuttings and sewage sludge together to produce an organomineral fertilizer (OMF). The effects on soil quality, waste and fertilizer properties, as well as the agronomic efficiency of the OMF in corn plants were evaluated. The results indicated that the gravel particle size (<0.25 mm) favours mineral dissolution and nutrient release, while the levels of heavy metals and microbiological parameters confirm the environmental safety of the product. The OMF presented physical, chemical and microbiological properties suitable for agricultural use, meeting regulatory standards. The OMF demonstrated agronomic efficiency comparable to conventional fertilizers, standing out as a sustainable alternative for agriculture.