Skip to main content

PILOT TESTING NEW TECHNOLOGY AT THE KITSAP COUNTY SEWER DISTRICT NO. 5/CITY OF PORT ORCHARD, WA JOINT WASTEWATER TREATMENT FACILITY

Buy Article:

$17.50 plus tax (Refund Policy)

Or sign up for a free trial

The Kitsap County Sewer District No. 5/City of Port Orchard Joint Wastewater Treatment Facility (JWWTF) must be upgraded and expanded to accommodate a growing population and meet stricter effluent limits attributed to an ongoing TMDL study. The JWWTF is subject to high wet weather flows and has limited space available for expansion. New technology offers solutions that could potentially increase the capacity and treatment efficiency of the JWWTF within the limited space available in a cost-effective manner.

Pilot studies of a membrane bioreactor (MBR) and ballasted floc reactor (BFR) were conducted to evaluate their potential for application at the JWWTF. MBRs combine activated sludge with membrane filtration. Consequently, biological treatment, secondary clarification, and filtration are accomplished in a single tank. When placed in aeration tanks, membranes provide near complete separation of suspended solids and facilitate mixed liquor concentrations of 10,000 to 15,000 mg/L. BFRs are a physical/chemical liquid-solids separation process using continuously recycled fine sand ballast to increase settling properties of suspended solids and associated contaminants. Compared to conventional clarification, BFRs offer higher removal efficiencies, higher surface loading rates, smaller footprints, and more consistent effluent quality.

Effluent from the MBR pilot plant generally contained ≤ 5 mg/L BOD5, ≤ 0.1 mg/L TSS, ≤ 0.5 mg/L NH3, ≤ 1 mg/L TKN, ≤ 10 mg/L TN, and ≤ 100 cfu/100 mL fecal coliform at a hydraulic retention time (HRT) of 3 hours. The maximum membrane flux was 19 gfd, significantly less than the 30 gfd expected. Operating the BFR pilot plant at overflow rates between 30 and 60 gpm/sf, effluent concentrations of BOD5 and TSS were less than 65 mg/L (> 60% removal) and 20 mg/L (> 90% removal), respectively. Designing a BFR to treat high wet weather peak flows in excess of the MBR capacity would limit the number of membranes required and reduce cost.
No Reference information available - sign in for access.
No Citation information available - sign in for access.
No Supplementary Data.
No Data/Media
No Metrics

Document Type: Research Article

Publication date: 2000-01-01

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