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The aim of the study was to find the antioxidant activity and enzyme activity of catalase and peroxidase of vegetable plants. The results indicated that the use of seaweed liquid fertilizer can enhance the antioxidant activity of Solanum melongena L., Lycopersicon esculentum Mill., Capsicum annuum L., Brassica oleracea var. Capitata L. and Allium cepa L. The 1,1-diphenyl-2picrylhydrazyl (DPPH) assays were used to determine the antioxidant properties of seaweeds by measuring the decrease in absorbance at 517 nm. The DPPH activity was highest in brown seaweed liquid fertilizer. This study implied that impacts on vegetable plantlets by seaweed liquid fertilizer extracted with enzymes is better in brown seaweed liquid fertilizer as compared to control.

Water pollution due to heavy metals are spreading world-wide along with industrial progress. In this research work cultivation of Spirogyra sp. & Oscillatoria sp. were done and wastewater treatment of heavy metal such as Cr, Cd & Pb was accumulated by algae. After treatment of algae Spirogyra sp. & Oscillatoria sp. were decomposed and to prepare compost. The production of biogas from algal biomass becomes economically feasible and cheaper. This present study revealed that the nutrient content of natural compost was recorded about C- 38.5%, N- 3.31%, P- 1.02%, & K- 3.42%, heavy metal content of Cd- BDL, Pb- 0.21ml/mg & Cr- 0.01ml/mg and biogas value 19.19 l/kg. The maximum value of biogas was recorded at 30 ppm concentration (27.95 l/kg) of algal compost as compare to natural compost (19.19 l/kg) in Spirogyra sp. The experimental study concluded that the selected algae showed better biogas production as compared to natural. Whereas out of selected two algae, Spirogyra sp. gave better outcome as compare to Oscillatoria sp. Thus, Study suggested that algal biomass constitute a promising, efficient, cheap, decayed material for making compost and biogas production.

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The current work used a batch study to investigate the efficiency of Ulva lactuca carbon for lead adsorption from aqueous solution. For the optimization study, the effects of several parameters such as pH, Adsorbent dosage, effective contact time, and initial concentration on lead removal were also considered. pH 3 was observed to be the most beneficial. The Langmuir isotherm, which represents mono-layer adsorption, yielded a maximum lead absorption of 3.49 mg/g. SEM was used to examine surface adsorption behavior, and FTIR was used to detect probable functional groups involved in the bio-adsorption experiment. This study shows that biochar made from the marine algae Ulva lactuca is effective for waste water treatment.