Closed Loop Aircraft Washrack Wastewater Recycle System

摘要

Aircraft washing operations generated large quantities of wastewater containing free and emulsified oils, and heavy metals in concentrations frequently exceeding local discharge limits. Oil/water separators have proven ineffective as a pretreatment method prior to discharging the wastewater into a sanitary sewer. The Naval Facilities Engineering Service Center developed and field tested a Closed Loop Aircraft Washrack Wastewater Recycle System (CLAWWRS) based on field-proven chemical treatment followed by pre-coat filtration technologies. The system was integrated with an existing washrack at Marine Corps Air Ground Combat Center, Twenty-nine Palms. Analytical results from field tests showed oil and grease removal to less than 15 pprn, and heavy metals consistently reduced under 0.1 ppm. Additionally, the chloride concentration in the recycle water was maintained well below the maximum allowable level of 400 ppm. Typical fresh water consumption of 100,000 gallons during combined armed exercises was reduced to 15,000 gallons. This User Data Package (UDP) provides information and guidance to activities requiring or using a CLAWWRS for their cleaning operations. This UDP addresses issues concerning economic feasibility, site selection and preparation, operator requirements and regulatory requirements. CLAWWRS operating instructions, system drawings, test data, site preparation requirements, economical analysis, and material safety data sheets can be found in the appendices.