Development of a Greywater Recycling System for Galley-Scullery Wastewater
Navy SBIR FY2014.1

Sol No.: Navy SBIR FY2014.1
Topic No.: N141-024
Topic Title: Development of a Greywater Recycling System for Galley-Scullery Wastewater
Proposal No.: N141-024-1079
Firm: Mainstream Engineering Corporation
200 Yellow Place
Pines Industrial Center
Rockledge, Florida 32955-5327
Contact: Dustin Zastrow
Phone: (321) 631-3550
Web Site:
Abstract: Navy vessels, such as littoral combat ships (LCS), operating in littoral waters are subject to local and federal regulations with respect to disposing of wastewater. These strict regulations prohibit discharging of greywater in many areas, therefore the greywater generated by the galley, scullery, and other shipboard operations must be stored aboard the ship until it can be safely offloaded shore side or at sea outside of littoral water limits. LCS holding tanks are normally designed to only support a 12 hour period of operation, and retrofitting a larger tank is expensive. To avoid the frequent, expensive visits to offload waste ashore, Mainstream Engineering proposes building upon a greywater recycling system that was originally developed for recycling Army kitchen wastewater. This system has a small footprint, uses minimal power, and is not prone to irreversible fouling. In Phase I, Mainstream will redesign the pretreatment section of the greywater recycling process to handle the Navy's galley and scullery waste stream. A continuous bench-scale system will then be tested and optimized. A 50 gal/hr modular prototype will also be designed. During Phase II, Mainstream will focus on prototype optimization, life testing, and commercialization of the product.
Benefits: An onboard greywater treatment process that would allow for the recycling of water for use in restricted activities aboard Navy ships would accomplish a number of goals. Navy vessels would be capable of operating in U.S. and other foreign waters for longer periods of time while complying with national and local environmental regulations due to the significantly lower need for dumping of wastewater. The Navy would also save a significant amount of money due to less reliance on expensive shore side waste disposal facilities (which are not always available for use), and less potable water would have to be used, also lowering costs. This Phase I program will result in a product that satisfies the Navy's need for a greywater treatment system, and will also serve as a greywater recycling unit for other military branches, Homeland Security applications, disaster relief operations, third-world nations, and numerous commercial applications including car washes, restaurants, and buildings.