Abstract: Fujian Fuhaichuang Petrochemical Co., Ltd. consists of three main factories, including an aromatic plant for production of PX, a PTA production plant and a self-distributed thermal power plant for heating and electricity generation. A large amount of desalted water is required in the production of these three plants, thus a considerable amount of regenerated wastewater with high concentration of inorganic salts is produced. The regenerated wastewater containing high concentration of inorganic salts for desalination was diverted to PTA wastewater treatment unit, uniformly diluted and added to PTA wastewater UASB (up-flow anaerobic sludge bed) anaerobic reactor as an anaerobic microbe micronutrient. After four months of operation, the granular sludge accounted for more than 60% of the total anaerobic sludge, and the COD removal rate of the anaerobic reactor increased by more than 5 percentage points, indicating that the regenerated wastewater had a significant role in promoting the granulation of anaerobic sludge.

Key words: pure terephthalic acid, wastewater, up-flow anaerobic sludge bed, inorganic salt, granulation