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Anaerobic and aerobic treatment of a simulated textile effluent
Author(s) -
O’Neill Cliona,
Hawkes Freda R,
Esteves Sandra R R,
Hawkes Dennis L,
Wilcox S J
Publication year - 1999
Publication title -
journal of chemical technology and biotechnology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.64
H-Index - 117
eISSN - 1097-4660
pISSN - 0268-2575
DOI - 10.1002/(sici)1097-4660(199910)74:10<993::aid-jctb142>3.0.co;2-s
Subject(s) - effluent , anaerobic exercise , chemistry , pulp and paper industry , chemical oxygen demand , bioreactor , wastewater , environmental engineering , environmental science , biology , physiology , engineering , organic chemistry
Abstract A simulated textile effluent (STE) was generated for use in laboratory biotreatment studies; this effluent contained one reactive azo dye, PROCION Red H‐E7B (1.5 g dm −3 ); sizing agent, Tissalys 150 (1.9 g dm −3 ); sodium chloride (1.5 g dm −3 ) and acetic acid (0.53 g dm −3 ) together with nutrients and trace elements, giving a mean COD of 3480 mg dm −3 . An inclined tubular anaerobic digester (ITD) was operated for 9 months on the STE and a UASB reactor for 3 months. For a 57 day period anaerobic effluent from two reactors, a UASB and an ITD, was mixed and treated in an aerobic stage. In days 77–247 68% of the true colour of PROCION Red H‐E7B was removed by anaerobic treatment with no colour removal aerobically and up to 37% COD was removed anaerobically, with a corresponding BOD removal of 71%. For combined anaerobic and aerobic treatment a mean COD removal of 57% and BOD removal of 86% was achieved. Operation of the ITD at a 2.8 day HRT (volumetric loading rate ( B v ) 1.24 g COD dm −3 day −1 ) and the UASB at a 2 day HRT ( B v 1.74 g COD dm −3 day −1 ) gave comparable COD removals but the UASB gave better true colour removal. Effluent from the combined process operating on this simulated waste still contained an average 1500 mg COD dm −3 , and further treatment would be required to meet consent standards. © 1999 Society of Chemical Industry