ITB-3894 - REMOVAL OF RESIDUAL LIMESTONE

Summary of Specifications:
The purpose of this bid is to provide services for the continual removal and marketing of residual limestone from the Water Treatment Plant (WTP) filter press. The work includes providing the labor and equipment for this removal as it is required for the continuous operation of the WTP. The WTP uses calcium oxide (CaO) to produce a softened municipal water supply. As a result of the softening a residue referred to as residual limestone (lime sludge or sludge) is produced. The material is in large part calcium carbonate (CaCO3) and in small part magnesium hydroxide (Mg(OH)2). The WTP continuously produces residual limestone at an approximate average 750 dry tons per month (9000 dry tons per year). Two plate and frame filter presses dewater the residual limestone resulting in a filter cake of approximately 58 to 64% solids by weight. At 60% solids by weight, average production is 1250 wet tons per month with the range being 950 wet tons in winter months to nearly 2000 wet tons in summer months.