Abstract
In this study water samples were collected from three sites (wadi Namar, Hayer and sewage water) supply of Riyadh, Kingdom of Saudi Arabia and treated with powder of moringa seeds, moringa cake and gold nanoparticles (which synthesis by moringa seeds) then have been tested on water microbial, the results of wadi nemar region showed the rate of inhibition percentage ranged between (1.6 and 33.4%), (0.0 and 21.1%) and (3.6 and 35.7%) at 1%, 2% and 3% respectively. In haier region, the results showed the rate of inhibition percentage ranged between (1.4 and 9.0%), (1.8 and 24.1%) and (3.4 and 22.9%) at 1%, 2% and 3% respectively, whereas inhibition percentage in sewage samples were ranged between (0.0 and 14.7%), (8.1 and 19.1%) and (3.8 and 20.4%) at 1%, 2% and 3% respectively. Effect of treatment with moringa cake have been showed that the results inhibition percentage ranged between (0.0 and 0.25%), (0.0 and 5.8%) and (5.4 and 41.8%) for wadi nemar at 1%, 2% and 3% respectively. In haier location the results showed the rate of inhibition percentage ranged between (17.1 and 33.8%), (15.2 and 21.9%) and (5.3 and 12.4%) at 1%, 2% and 3% respectively, whereas inhibition percentage in sewag samples were ranged between (24.0 and 36.4%), (29.4 and 31.9%) and (25.1 and 26.2%) at 1%, 2% and 3% respectively.The effect of treatment with gold nanoparticles which synthesis by moringa seed at three different concentrations 5, 10 and 15% recorded that No effect was presented in inhibition percentage in wadi nemar and sewage samples at three tested concentrations at three water dilutions. Whereas in haier location, the results showed no effect were presented at 5% whereas the rate of inhibition percentage ranged between (8.5 and 16.0%) and (2.7 and 14.1%) at 10% and 15% respectively.Additionally some physico-chemical parameters like pH, total dissolved solids (TDS), fluoride (F-), chloride (Cl-), (Br-), sulphate (So4-), Lithium (Li+), sodium (Na+), potassium (K+), Magnesium (Mg+), and Calcium (Ca++) were measured and compare the standard drinking water quality values of WHO.