Skip to main content

LOW–DOSE ALKALINE DISINFECTION OF DEWATERED BIOSOLIDS

The full text article is not available for purchase.

The publisher only permits individual articles to be downloaded by subscribers.

or click here to sign up for a free trial

Abstract:

Bench-scale experiments were conducted to establish the effect of low-dose alkaline treatment of Winnipeg dewatered, anaerobically digested biosolids and determine the abiotic factors leading to pathogen inactivation over a long-term anoxic storage with various additions of alkaline materials. Technical-grade lime and fly ash from a nearby power plant were used as alkaline agents. The stored biosolids were mixed with soil to test for pathogen regrowth.

The tests were designed to find optimum doses that would bring the pH to a level high enough to convert most of the indigenous ammonia from ammonium ion (NH4 +) to free ammonia gas (NH3). Various doses of lime and power plant fly ash showed significant evolution of free ammonia from digested, dewatered biosolids at the lowest doses of addition.

Anoxic storage of lime-applied biosolids was effective in reducing levels of fecal coliform and Salmonella sp. bacteria well below those required to regard the biosolids as U.S. EPA's Class A within one day. The minimum effective lime dose was 30 g CaO/kg TS. There was no significant pH change at doses higher than 60 g CaO/g TS even after 6 months of storage.

Fly ash doses had to be 10 times greater than lime doses to achieve the same level of fecal coliform reduction. When combined, lime and fly ash resulted in a greater pH increase in biosolids than either used individually.

Fecal coliform regrowth in topsoil formulations was limited to the mixtures containing raw biosolids and biosolids treated with 30, and 60 g CaO/kg TS, and remained below the Class A limit. There was no Salmonella regrowth observed in any of the topsoil formulations.

Document Type: Research Article

DOI: http://dx.doi.org/10.2175/193864700784545748

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 These proceedings are not peer reviewed.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
  • Ingenta Connect is not responsible for the content or availability of external websites
wef/wefproc/2000/00002000/00000009/art00037
dcterms_title,dcterms_description,pub_keyword
6
5
20
40
5

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
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