Starch-g-Polyacrylic acid hydrogel (Starch-g-PAAc) hydrogel was synthesized from starch and Polyacrylic acid (AAc) via gamma irradiation at dose at 20 kGy. The synthesized hydrogel was examined via Fourier-transform infrared spectroscopy (FTIR), X-ray diffraction (XRD) and Scan Electron Microscopy (SEM). The swelling properties were studied at different time intervals and different pH's values. The biodegradability of hydrogels in Soil Burial and the bioremediation in river Nile model of wastewater was investigated over 16 and 4 weeks respectively. Results showed that the biodegradation percent of the starch-g-PAAc (4:1 v/v) hydrogel in Soil Burial 85% compared with pAAc 55% and the bioremediation percent of the starch-g-PAAc (4:1 v/v) hydrogel in the previously engineered wastewater exhibited a biodegradation percent (56%) compared with the synthetic PAAc with 26% biodegradation rate. These results suggest that the prepared starch-g-pAAc (4:1v/v) hydrogels were used as a biodegradable composites and had good better physical characteristics while being more environmentally ecologically friendly.