Affiliations: The State Key Laboratory of Pollution Control and
Resource Reuse, School of Environment, Nanjing University, Nanjing 210093,
China | Yangtze Petrochemical Corporation, Nanjing 210048,
China | Department of Ecology and Biodiversity, The University
of Hong Kong, SAR, China
Abstract: The biodegradation and toxicity of the purified terephthalic acid
(PTA) processing wastewater was researched at NJYZ pilot with the fusant strain
Fhhh in the carrier activated sludge process (CASP). Sludge loading rate (SLR)
for Fhhh to COD of the wastewater was 1.09 d^{-1} and to PTA
in the wastewater was 0.29 d^{-1}. The results of bioassay
at the pilot and calculation with software Ebis3 showed that the
48h-LC_{50} (median lethal concentration) to Daphnia magna
for the PTA concentration in the wastewater was only 1/10 of that for the
chemical PTA. There were 5 kinds of benzoate pollutants and their toxicities
existing in the wastewater at least. The toxicity parameter value of the pure
chemical PTA cannot be used to predicate the PTA wastewater toxicity. The
toxicity of the NJYZ PTA wastewater will be discussed in detail in this
paper.
