A New Design of Recycled Concrete Aggregates as an Aerated Filter for Removal of Phosphorus

Abstract

Abstract. This paper assesses a new design of recycled concrete aggregates as an aerated filter for removal of phosphorus (P). Recycled concrete aggregates (RCA) obtained from crushed concrete waste. In this study, RCA is used as an Aerated Filter for removal of P. A commercial concrete was crushed, and the RCA were sieving according to different sieve size. The highest percentage passing sieve size is size 5 mm is 99.88%. The bulk density for RCA is 1680 kg/m 3 while percentage of voids is 36%. Result for water absorption test of RCA is 1.27, the Aggregate Impact Value (AIV) test is 28.75 and the pH value for RCA is 9.30 which is alkaline. RCA with smallest size and lowest initial concentration of P which is 0mm to 5mm and 10mg/L respectively has the lowest uptake capacity which 0.996 mgL -1 /g but highest percentage of P removal which 99.60%.Besides cost saving, due to application of water material, the usage of RCA will ease the environmental problems that are currently perceived globally. RCA could also saves landfill space which helps reduce the needs for gravel mining and reduces pollution.