Numerous studies on pollutant removal and the application of various electrochemical technologies have already been conducted in the area of electrocoagulation (EC). Sludge, a waste product of the EC process, results in higher operational expenses associated with waste disposal. Sludge includes valuable materials like nutrients or metals removed during water purification in addition to metals from the electrodes used in an EC system, like aluminum or iron. For the removal of phosphate by electrocoagulation using iron electrodes, the effects of various operational parameters including, electrolysis duration (25 min), voltage (10 V), pH (7.0), NaCl concentration (2 g/L), and electrode spacing (3 cm) were found to be the most effective for optimizing phosphates by EC. The maximum amount of phosphorus removed under these ideal circumstances is 93.94%. One of the most widely used pesticides in the globe is organophosphate. Malathion, which is one of them and is categorized as carcinogenesis, needs to be properly eliminated because it is widely used and has a lot of pathogenicity. The primary purpose of this study is to reuse the sludge and synthesize with marine algae to produce nanoparticles (NP) for the degradation of malathion. The parameters are agitation time (30 min), pH (7), catalyst dosage (0.1 g/L) at 318 K, the degradation of Studies on kinetics and thermodynamic studies have produced the greatest outcomes electron microscope (SEM), X-ray diffraction (XRD) and Fourier transform infrared (FTIR) analysis has been carried out. The goal of the current research is to degrade malathion using Fe3 O4 /marine algae NP. The effects of independent variables such as pH, catalyst dosage, and agitation time on malathion degradation effectiveness have been examined based on experimental data using the Response Surface Methodology (RSM) by Box-Behnken Design (BBD).

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