Study On Phosphate Removal Capacity Of Water Treatment Residue (wtr) From Wastewater

Eutrophication has become a critical environmental concern of surface waterrnbodies in Ethiopia due to release of untreated wastewater containingrnespecially phosphate and nitrogen. The objective of this study was to evaluaternthe phosphate removal capacity of WTR from synthetic and actual wastewaterrnsamples. For this purpose, WTR from Gefersa Water Treatment Plant wasrncollected, air dried, grinded, sieved through 2.0, 0.125 and 0.063 mm sieves.rnThen batch experiments were conducted by mixing WTR with in 100 mlrnsynthetic phosphate solution having concentration of 4 mg/L. Accordingly, 2 grnWTR was found to be optimal dose resulting in 97.25 % reduction ofrnphosphate. Adsorption tests have been conducted at pH of 3, 4, 6, 8 and 9;rnthe optimal pH was found out to be 4 resulting in 87 % reduction of thernphosphate from the solution. The optimal contact duration period found out tornbe 12 hours with phosphate removal efficiency of 94.82 %. The maximumrnadsorption capacity of the WTR was found out to be 1,709 mg/Kg. Batchrnadsorption tests were also conducted on actual wastewater collected fromrnAbattoir’s and Brewery’s facilities, and the WTRs have removed 95 % andrn99.8 % of the phosphate from the wastewaters respectively. Removal of thernphosphate through adsorption using Water Treatment Residue (WTR) is costrneffective as compared to chemical methods. Thus WTR was found out to bernefficient adsorbent for removal of phosphate from wastewater.rnKey words: WTR, adsorption, adsorbent, phosphate

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