Impacts of Enhanced Digestion Processes on Biosolids Quality Parameters: Odors and Indicators.

$17.50 plus tax (Refund Policy)

Buy Article:

Abstract:

The objectives of this research were to evaluate several different enhanced or advanced digestion processes for their ability to minimize the risk for a sustainable Class A biosolids program. The two key risks that were considered were odors and increases in indicator bacteria density after dewatering. The four processes evaluated included thermal hydrolysis pretreatment, dual digestion, enhanced enzymic hydrolysis, and multi-stage thermophilic digestion. All of the processes were able to reduce the culturable density of indicator bacteria, fecal coliform, below the Class A limit of 1000 MPN/g DS. However, the thermal hydrolysis process appears to be the the process that best minimizes the risk of increases in fecal coliform densities after dewatering. The odorant production by the cake from the different processes were generally lower than conventional mesophilic anaerobic digestion processes with centrifuge dewatering, although were somewhat variable, and may present some risk of nuisance odors. The advantage of the thermal hydrolysis pretreatment is that high solids can be achieved with belt filter press dewatering that are equivalent to centrifuge dewatering. Belt filter press cakes have generally been shown to have lower odors and less likelihood of indicator bacteria increases in the cake which further helps the thermal hydrolysis process minimize risks related to odors and indicators.

Document Type: Research Article

DOI: http://dx.doi.org/10.2175/193864709793953584

Publication date: January 1, 2009

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 These proceedings are not peer reviewed.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