Skip to main content

STRATEGIES TO SHOW COMPLIANCE WITH VECTOR ATTRACTION REDUCTION REQUIREMENTS WITH AEROBIC DIGESTION

Buy Article:

$9.50 plus tax (Refund Policy)

Or sign up for a free trial

The purpose of the paper is to present the data collected over an eight (8) year period that evaluated methods for demonstrating compliance with vector attraction reduction (VAR) requirements in a wastewater treatment plant (WWTP) that employs aerobic digestion. Many WWTPs in the northern states experience periods during the winter when they either can't meet VAR or are unable to show that they meet VAR. The methods available to show compliance with VAR for aerobic digestion are: volatile solids reduction over the digestion process, bench scale testing, or the specific oxygen utilization rate (SOUR) test. Each method can present some problems for the operator.

The data collected by the Annville Township Authority Wastewater Treatment Plant (AWWTP) staff was necessitated by passage of 40 CFR Part 503. During the first year after 503 was published, the AWWTP staff chose to conduct the Bench Scale test several times in order to become proficient. While conducting these initial bench-scale tests, they discovered that they did not meet VAR over the winter months (for biosolids tested in the spring). Because the biosolids did not meet VAR requirements, surface applications of biosolids in the spring, without incorporation, were not permitted under the regulations. Because the bench-scale test takes 30 days to complete, scheduling biosolids applications with the farmers was problematic. AWWTP staff made several operational changes to meet VAR in the spring. The staff calculated the percent volatile solids reduction for the bench scale test using mass balance and Van Kleeck, as a matter of interest. They found that in most cases, either method could be used to calculate the percent volatile solids reduction as both methods generated similar results, ie, passing or failing the test.

The AWWTP staff also analyzed the volatile solids content of their biosolids used in the bench-scale testing. They found that they could use the volatile solids content of the digester solids to predict the outcome of the bench scale test. The significance being that volatile solids content can be conducted in one day verses 30 days for the bench scale test. They also looked for a relationship between the bench scale test results and the SOUR test, using undiluted and diluted samples. However, additional data is needed before any relationship can be established. The data they collected over the past 8 years is interesting and should provide insight to other WWTPs that employ aerobic digestion.

The AWWTP currently operates a biosolids management program that relies entirely on land application of liquid biosolids. The treatment plant is small and generates only 130 dry tons of biosolids each year. Aerobic digestion is employed for stabilization of the wastewater solids.
No Reference information available - sign in for access.
No Citation information available - sign in for access.
No Supplementary Data.
No Article Media
No Metrics

Document Type: Research Article

Publication date: 2001-01-01

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