If you are experiencing problems downloading PDF or HTML fulltext, our helpdesk recommend clearing your browser cache and trying again. If you need help in clearing your cache, please click here . Still need help? Email help@ingentaconnect.com

OPTIMIZATION OF MULTIPLE HEARTH FURNACE OPERATIONS TO MINIMIZE CYANIDE FORMATION WHEN COMBUSTING DEWATERED SEWAGE SLUDGE

$17.50 plus tax (Refund Policy)

Buy Article:

Abstract:

The Central Contra Costa Sanitary District (CCCSD) was facing the probable reduction of wastewater treatment plant final effluent limit for cyanide compounds (CN) from 25 micrograms per liter (μg/l) to a new regulatory limit of 10 μg/l. The major CN source was the multiple hearth furnaces (MHFs) where CN compounds are formed as a byproduct of the biosolids combustion process and captured in the scrubber water that is discharged to the Headworks of the treatment plant. Five (5) days of testing were conducted on one of CCCSD's eleven hearth MHFs, where hearth 1 is the afterburner and sludge is fed to hearth 2. The tested ranges of the key MHF operating variables resulted in six (6) test mode combinations of oxygen (3 ranges) and afterburning (AB) temperature levels (2 ranges) which were used to classify the sample test cases. The medium oxygen — high AB temperature operating mode achieved the best overall performance rating of the two modes particularly on fuel use rate and the emission test variables. This comprehensive test project confirmed and verified previous test findings from other facilities about the effects of AB temperature and oxygen level on MHF scrubber water CN levels. Concurrent measurements of furnace and emission performance variables revealed the overall benefits of increasing AB temperature level. An AB temperature of ∼ 1300°F was determined to be the primary control technique for reducing scrubber water CN levels to minimize the negative impacts associated with operating at higher oxygen levels.

Document Type: Research Article

DOI: http://dx.doi.org/10.2175/193864700784607244

Publication date: January 1, 2000

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 These proceedings are not peer reviewed.

    WEF Members: Sign in (right panel) with your IngentaConnect user name and password to receive complimentary access.
  • Subscribe to this Title
  • Membership Information
  • About WEF Proceedings
  • WEFTEC Conference Information
  • ingentaconnect is not responsible for the content or availability of external websites

Tools

Favourites

Share Content

Access Key

Free Content
Free content
New Content
New content
Open Access Content
Open access content
Subscribed Content
Subscribed content
Free Trial Content
Free trial content
Cookie Policy
X
Cookie Policy
ingentaconnect 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