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Performance of a continuous stirred tank reactor with immobilized denitrifiers and methanogens
Author(s) -
Chen KuoCheng,
Lin YingFeng,
Houng JerYiing
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 - 10.2175/106143097x125399
Subject(s) - denitrification , nitrate , effluent , methanol , chemistry , hydraulic retention time , methane , nitrogen , environmental engineering , environmental chemistry , environmental science , organic chemistry
Water denitrification by a coimmobilized mixed culture of denitrifiers and methanogens to simultaneously remove nitrate and excessive carbon source, methanol, in a continuous stirred tank reactor was investigated. Complete denitrification occurred at a methanol to nitrate nitrogen (M:N) ratio of ≥2.62. Ratios beyond 2.62 methane formation took place resulting in the depletion of excess methanol. The quality of the effluent solution was found to be markedly dependent on nitrate loading. At a constant M:N ratio ∼3.2, a complete nitrate and methanol removal could be attained when the influent nitrate concentration was <385 mg N/L; otherwise, the hydraulic retention time (HRT) was operated >2 hr (at a constant influent nitrate around 100 mg N/L). The surplus methanol was verified to be converted directly into methane when complete denitrification was achieved. Moreover, a sufficient correlation was found between the biological activity and the redox potential.