Doctoral Dissertations


Mao-Yuan Tur


"The anaerobic degradability of phthalic acid (PA), isophthalic acid (IA) and terephthalic acid (TA) was evaluated at 35°C using a modified serum bottle technique. It was found that sludge acclimation to these acids could be greatly enhanced by periodic dosings of glucose as a carbon supplement. When glucose was used, the sludge became acclimated to PA in 70 days, to IA in 115 days, and to TA in 155 days. Without glucose, the acclimation to PA took 120 days, but it never occurred to IA and TA throughout a duration of 300 days. Upon acclimation, the daily gas productions for degrading 4000 mg/L of PA, IA and TA, each in 20-ml test volume, were 2.3, 2.8 and 2.2 ml/day, respectively. About 90% of the removed aromatic acids were converted to methane.

The treatability study of a synthetic PA waste by an anaerobic hybrid reactor, it was found that upon sludge acclimation, the hybrid system could decompose PA at 4000 mg/L. At 35 °C and a organic loading of 20 g COD/L-day, 95% COD removal was achieved. About 89.5% of the decomposed PA was converted to methane. The residual COD mainly consisted of non-decomposed PA instead of degradation intermediates. This suggested that the rate-limiting step of biodegradation was the "ring cleavage". After one year operation, the biomass concentration reached 26.2 g VSS/L, and the sludge could lead to granulation, suggesting that phthalic waste could be effectively treated by the UASB system"--Abstract, page iii.


Huang, Ju-Chang, 1941-2018
TerKonda, Purush

Committee Member(s)

Lentz, Rodney
Morris, Charles Darwin
Bain, Lee J., 1939-


Civil, Architectural and Environmental Engineering

Degree Name

Ph. D. in Civil Engineering


National Science Council, Taiwan
R&MRC, Taiwan


University of Missouri--Rolla

Publication Date

Summer 1996

Journal article titles appearing in thesis/dissertation

  • Biodegradation and methanogenic conversion of phthalic, isophthalic and terephthalic acids
  • Treatment of phthalic waste by anaerobic hybrid reactor


x, 59 pages

Note about bibliography

Includes bibliographical references.


© 1996 Mao-Yuan Tur, All rights reserved.

Document Type

Dissertation - Restricted Access

File Type




Subject Headings

Sewage sludge digestion
Sewage -- Purification -- Anaerobic treatment
Refuse and refuse disposal -- Biodegradation
Phthalic acid

Thesis Number

T 7174

Print OCLC #


Electronic OCLC #


Link to Catalog Record

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