Pemanfaatan limbah lumpur padat dari industri penyamakan kulit untuk pembuatan bata beton pejal

Solid sludge waste from the Tanning Industry is still a problem in exile, because it is considered as “B3” waste, and containing chromium. The objective of the research utilize solid sludge waste as a partial with two types of variable I,e : 1). Solid concrete block with coral 2). Solid concrete block without coral. Each variable has three variations in the composition of cement, sand and mud, that were 1 part cement : 5 part cement : 4 parts sand : 1 part sludge (without coral) has met the physical requirements of solid concrete block concrete block classification standards, according to SNI-03-0348-1989 quality level IV, which has a minimum compressive strength of 30.25 kg/cm2 (standard 25 kg/cm2) and a maximum water absorption of 13.99% (standard - %). Solid concrete block can be used for buildings that do not bear the burden and protected from the weather. Having held the test of leachate from solid concrete block with TCLP method turned out to produce chromium content : 4.017 mg/ l is still below the threshold (5.00 mg/l), which means that concrete can be used for use outdoors (exposed to rain), because it will not pollute the soil and groundwater and can be transported/brought out the leather tanning factory environment.