Star Enterprise Refinery
This project was initiated to reduce risk of releasing untreated wastewater to public waters and to reduce risk of groundwater contamination. The antiquated system consisted of open, earthen ditches collecting storm and wastewater from more modern closed sewers serving thirty processing areas scattered over 1,000 acres. In addition, over 300 acres of open, earthen reservoirs provided flow equalization and storm surge for the commingled storm and wastewater from these areas plus associated tank farms. These waters are treated in an Activated Sludge Treating Unit (ASTU) before discharge into public waters.
To reduce quantity and risk of untreated wastewater discharges by segregating clean stormwater and contaminated wastewater, Star Enterprise built a leak-free and vapor tight wastewater collection system from every process to the ASTU. Star Enterprise collected and treated vapors produced in the wastewater collection system and process wastewater and stormwater from "potentially contaminated" areas. To further reduce risk clean stormwater is impounded and tested before being released to public waters. Remediation of existing ditches and reservoir sludges from the old earthen system while installing the new system.
Segregation reduced the risk of groundwater contamination, reduced the quantity of air emissions and minimized risk of discharging contaminants from spills and leaks into the clean stormwater system. Generation of wastewater sludges was reduced to a level that can currently be recycled through the Delayed Coking Unit (DCU) rather than disposed of offsite. In addition, significant increases in quantity and variety of wildlife are a positive indicator of overall environmental improvement resulting directly from the installation of these facilities.
Details of Reductions
Additional Information :
The initial construction was $150 million plus the cost of associated wastewater sludge remediation. Economic benefits are minimal.