Laserfiche WebLink
Honorable Chairman and <br />Board of County Commissioners <br />9/16/91 <br />Page 25 <br />The sidestream flow is estimated to be 339,490 gpd for the design year 2000 <br />maximum month conditions shown in Table 6. The total suspended solids <br />concentration (TSS) is estimated to be 250 milligrams per liter (mg/L) and <br />the biochemical oxygen demand measured after five days (BODS) of the <br />sidestream is estimated to be 250 mg/L. <br />Because the Regional Sludge Facility operates 12 hours per day during design <br />conditions, an equalization basin is needed so that the sidestream flow can <br />be discharged to the Central Subregional WWTP at a constant rate. A 55 -foot <br />diameter equalization basin with a 21 -foot sidewater depth is thus included <br />in the design. This basin is able to store one day's sidestream flow for <br />discharge during off-peak hours. Included in the equalization basin is a <br />diffused aeration system capable of maintaining the dissolved oxygen content <br />of the sidestream at 2.0 mg/L which will maintain aerobic conditions. The <br />airflow will also keep the solids in suspension. This will prevent the <br />sidestream waste from settling or putrefying, thereby reducing odor <br />potential. Additionally, the basin is covered with a geodesic dome to ensure <br />positive odor control. The air stream is treated at the common odor control <br />system. <br />The onsite sidestream pump station is designed to pump a flow of 1.110 gpm. <br />This rate allows draining of the equalization basin in Tess than 6 hours. <br />The pump station is valved so that sidestream flow can be pumped to the <br />equalization basin or the Central Subregional WWTP. <br />PROJECT COST ESTIMATE <br />An estimate of the capital costs for the project has been developed and is <br />included in Table 7. The total construction bid amount is $4,600,000. An <br />M. VRB2/5 <br />