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Degradation of triethanolamine and chemical oxygen demand reduction in wastewater by photoactivated periodate
Author(s) -
Weavers Linda K.,
Hua Inez,
Hoffmann Michael R.
Publication year - 1997
Publication title -
water environment research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.356
H-Index - 73
eISSN - 1554-7531
pISSN - 1061-4303
DOI - 10.2175/106143097x125849
Subject(s) - triethanolamine , chemical oxygen demand , wastewater , chemistry , periodate , degradation (telecommunications) , nuclear chemistry , aqueous solution , irradiation , pulp and paper industry , environmental chemistry , waste management , organic chemistry , analytical chemistry (journal) , telecommunications , computer science , engineering , physics , nuclear physics
The rapid reduction of chemical oxygen demand (COD) of industrial wastewater is achieved using a novel oxidant, periodate (IO 4 − ), coupled with ultraviolet (UV) irradiation. The wastewater is characterized by a high COD, low total suspended solids, variable triethanolamine (TEA) concentrations, and low concentrations of iron and zinc. The use of periodate and UV irradiation with either aqueous TEA solutions or real wastewater is shown to be effective in reducing the COD to acceptable levels. The optimal pH for COD degradation is determined to be 7.6 because of the combined effects of pH on the speciation of TEA and IO 4 − Increasing the ratio of the initial concentrations of period ate to TEA, [IO 4 − ] 0 /[TEA] 0 , increased the degradation rate up to an apparent saturation value. Irradiation with a 1 000‐W mercury‐xenon lamp increased the COD pseudo‐first‐order degradation rate constant by a factor of 5.5 for synthetic TEA solutions and 2.3 for industrial wastewater, compared to irradiation with a 1 000‐W xenon lamp.