Treatment of local residential drainage sludge at UNICITI ALAM Campus

Abstract

The untreated drainage sludge from local residential lead to environmental pollution and human health disorder. The high heavy metals content in sludge may leaching out during heavy rains or flash floods which in return to our water sources. Stabilization and Solidification (S/S) techniques is crucial to treat or avoid the leaching of heavy metals to environments. A study was carried to evaluate the compressive strength of concrete with different curing time which were 7 days for initial strength and 28 days for final strength. Two different curing condition being tested which were dry samples and immersed samples in order to compare the possible hydration process occur in sample which lead to a higher compressive strength. The analyses of heavy metals content by using X-ray fluorescence (XRF) in waste, ordinary Portland cement, rice husk ash and concrete had been performed. Based on the result obtained, the lower the drainage sludge content in sample, the higher compressive strength due to less excessive water and less porosity occur in the hardened sample. The higher compressive strength at 28 days was achieved in sample batch one and the lowest compressive strength at 28 days was achieved in sample batch 5. The optimum batch produced was sample batch 5. This is because higher waste composition and achieved compressive strength higher than 1 Mega Pascal.