Title page for ETD etd-07242012-040054

Type of Document Master's Thesis
Author Randall, Andrew A.
URN etd-07242012-040054
Title Operational and exocellular biopolymer characteristics of sludges generated from an air products and a convential activated sludge system
Degree Master of Science
Department Environmental Engineering
Advisory Committee
Advisor Name Title
Novak, John T. Committee Chair
Knocke, William R. Committee Member
Randall, Clifford W. Committee Member
  • Polymers
Date of Defense 1987-07-15
Availability restricted
This study compared the sludge characteristics of a lab-scale Air

Products (A/O) and a conventional activated sludge system. The sludges

were analyzed for operational properties and the exocellular biopolymers

of each sludge was characterized.

Operational analysis mainly consisted of measurements of settling

(SVI) and dewatering (specific resistance, CST) parameters at each

sludge age. Biopolymers were measured using pH extraction followed by

gel filtration and subsequent analysis for carbohydrate and protein


The results showed a high degree of similarity between the two

systems both operationally and with respect to biopolymer

characteristics. The A/0 system did produce a lower effluent soluble

COD at sludge ages below 5 days. Also, the A/O system showed some

consistent differences in the distribution of bound and unbound

fractions of protein and carbohydrate ECP but these had no discernible·

effect on sludge operational characteristics.

In addition relationships between unbound ECP and effluent BOD,

bound HMW ECP and SVI, and phosphorus and Mg uptake were observed, with

varying degrees of consistency, in this study.

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