Skip to main content

Treatment of Naval Ship Hull Cleaning Waste Residual by High-Shear Rotary Ultrafiltration

Buy Article:

$9.50 plus tax (Refund Policy)

Or sign up for a free trial

The effectiveness of the high-shear rotary ultrafiltration (HSRUF) system for concentrating sludge from ship waterborne underwater hull cleaning effluent processing operations was examined. The sludge was a mixture of material removed from the ship hull that did not settle in the primary settling chamber, and iron oxide solids. The sludge solids concentration was approximately 5%. Two membranes, a 0.1 um Ti-Al oxide membrane and a 3 um sintered metal membrane were tested. Each membrane had 1 ft2 of membrane area and was rotated at 1100 rpm. Temperature was not controlled but was monitored. Permeate flux, turbidity, temperature and pH were measured frequently. Samples of permeate and feed tank contents were taken at whole number values of the hydraulic concentration factor and at the end of each run. Samples were tested for turbidity and copper concentration (permeate), and solids concentration (feed tank). Both membranes were effective in concentrating the sludge - from about 5% to 32% for the 0.1 um membrane and from 5% to 42.5% for the 3 um membrane. The permeate flux for the 0.1 um membrane ranged from 59 gal/ft2 -d at 5% solids to 33 gal/ft2 -d at 32% solids. The permeate flux for the 3 um membrane ranged from 63 gal/ft2 -d at 5% solids to 235.8 gal/ft2 -d at 42.5% solids. For the 0.1 um membrane, pressure excursions were conducted at feed tank solids concentrations of 5% and 20%. For both concentrations, the flux versus transmembrane pressure relationship was linear. For the 3 um membrane the pressure excursion was conducted at a solids concentration of 10% and was also linear. Based on these data, it appears that system had not reached the pressure independent stage and higher fluxes could be realized with increases in transmembrane pressure. Permeate turbidities for both membranes were about 0.02 NTU and were not a function of temperature or feed concentration. The permeates were relatively clear and aqua blue in color. After sitting overnight, a greenish precipitate formed. It is hypothesized that the copper in the permeate either desorbed from the ferric hydroxide solids or was leached from paint particles under the elevated temperature and pressure conditions in the membrane chamber. The aqueous phase copper passed through the membrane with the permeate and when the temperature decreased to ambient levels Cu(OH)2(S) (or some other Cu solid) formed. In an actual system, the permeate from the HSRUF process would be returned to the head of the US Filter process and should not adversely affect the performance of the ACTIFLO.
No Reference information available - sign in for access.
No Citation information available - sign in for access.
No Supplementary Data.
No Data/Media
No Metrics

Keywords: COPPER; MICROFILTRATION; RESIDUAL CONCENTRATION; SLUDGE; ULTRAFILTRATION; VOLUME REDUCTION

Document Type: Research Article

Publication date: 2007-10-01

More about this publication?
  • Proceedings of the Water Environment Federation is an archive of papers published in the proceedings of the annual Water Environment Federation® Technical Exhibition and Conference (WEFTEC® ) and specialty conferences held since the year 2000. These proceedings are not peer reviewed.

    A subscription to the Proceedings of the Water Environment Federation includes access to most papers presented at the annual WEF Technical Exhibition and Conference (WEFTEC) and other conferences held since 2000. Subscription access begins 12 months after the event and is valid for 12 months from month of purchase. A subscription to the Proceedings of the Water Environment Federation is included in Water Environment Federation (WEF) membership.

    WEF Members: Sign in (right panel) with your IngentaConnect user name and password to receive complimentary access. Access begins 12 months after the conference or event
  • Subscribe to this Title
  • Membership Information
  • About WEF Proceedings
  • WEFTEC Conference Information
  • Learn about the many other WEF member benefits and join today
  • Ingenta Connect is not responsible for the content or availability of external websites
  • Access Key
  • Free content
  • Partial Free content
  • New content
  • Open access content
  • Partial Open access content
  • Subscribed content
  • Partial Subscribed content
  • Free trial content
Cookie Policy
X
Cookie Policy
Ingenta Connect website makes use of cookies so as to keep track of data that you have filled in. I am Happy with this Find out more