Skip to main content

EFFECT OF AMMONIA ON METAL LEACHING FROM FLY ASH

Buy Article:

$17.50 plus tax (Refund Policy)

Or sign up for a free trial

Abstract:

Effect of ammonia on heavy metal leaching from a class F fly ash was investigated under different pH conditions. Cu(II), Cd(II), Ni(II), and Pb(II) were used as representative metals in the experiment. The surface physical-chemical characteristics of fly ash that affect metal adsorption, such as the density and acidity constant of metal-binding site on ash surface, were also studied. Results showed that the fly ash contain one type of acid site that is responsible for metal adsorption. The site density and acidity constant (pKH) are 1.8×10−5 mol/g and 7.8, respectively. Without ammonia, the adsorption of interested metal cations, increased with the increase of pH. The adsorption constants (log KS) of Cu(II), Cd(II), Ni(II), Pb(II) onto fly ash surface are 6.36, 4.88, 4.84, 8.59, respectively. Results also showed that ammonia can enhance the leaching of heavy metals that form metal-ammonia complexes, especially when ammonia concentration is greater than 5000 mg/L.

Document Type: Research Article

DOI: https://doi.org/10.2175/193864703784678856

Publication date: 2003-01-01

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 These proceedings are not peer reviewed.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