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

Extant Biodegradation Testing With Linear Alkylbenzene Sulfonate in Laboratory and Field Activated Sludge Systems

$17.50 plus tax (Refund Policy)

Buy Article:

Abstract:

Two 1-L porous pot (65 μ stainless steel mesh) reactors were fed synthetic wastewater with a COD of 200 mg/L including 2 mg/L linear alkyl benzene sulfonate (LAS) to evaluate the influence of specific operating conditions (i.e, hydraulic retention time, HRT, and solids retention time, SRT) on the measured rate of LAS biodegradation. The reactors were operated in parallel under a constant SRT of 10 d, and HRTs of 2, 4, 6, and 12 h. Subsequently, the reactors were operated under a constant HRT of 6 h, and SRTs of 3, 6, 10, and 15 d. The biodegradation responses of LAS were measured using a respirometric method, and the extant kinetic parameters were evaluated using the Monod model. The extant kinetic parameters obtained from these experiments suggest that the HRT had little impact on the measured kinetic parameters (μˆ = 0.14 ± 0.06 h−1, KS = 0.4 ± 0.3 mg COD/L, and Y = 0.67 ± 0.02 mg biomass COD formed/mg LAS COD utilized) at a constant SRT of 10 d. The SRT had a more noticeable effect on the measured biodegradation kinetics (e.g., Y increased from 0.50 ± 0.08 to 0.66 ± 0.05 mg/mg when the SRT increased from 3 to 10 d at a constant HRT of 6 h). Extant kinetics for LAS biodegradation were measured in the field at two activated sludge wastewater treatment plants operated at different conditions. The field results were similar to the results from laboratory systems operated to simulate the field conditions (μˆ values ranged from 0.02 - 0.05 h−1, KS values ranged from 0.11 - 0.39 mg COD/L, and yield values ranged from 0.46 - 0.50 mg biomass COD formed/mg LAS COD utilized). The week to week variability in measured LAS kinetic parameters was greater with the field samples than with the laboratory samples, possibly due to the non-steady state nature of the treatment plants. The long term variability in the field kinetic parameters was comparable to the laboratory variability. These results confirm the efficacy of the extant respirometric technique to measure biodegradation rates of surfactants in laboratory and field systems operated at a range of HRT and SRT conditions.

Document Type: Research Article

DOI: http://dx.doi.org/10.2175/193864700784545874

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