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Identifying an interfering factor on chemical oxygen demand (COD) determination in piggery wastewater and eliminating the factor by an indigenous Pseudomonas stutzeri strain
Author(s) -
Su J.J.,
Liu B.Y.,
Chang Y.C.
Publication year - 2001
Publication title -
letters in applied microbiology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.698
H-Index - 110
eISSN - 1472-765X
pISSN - 0266-8254
DOI - 10.1046/j.1472-765x.2001.01027.x
Subject(s) - chemical oxygen demand , wastewater , nitrite , pseudomonas stutzeri , chemistry , aeration , pulp and paper industry , denitrification , activated sludge , environmental chemistry , nitrate , environmental engineering , nitrogen , biology , environmental science , bacteria , organic chemistry , genetics , engineering
Aims: This study attempted to demonstrate nitrite interference on chemical oxygen demand (COD) determination in piggery wastewater, and the capability of aerobic denitrification of the SU2 strain which is capable of promoting the efficiency of nitrogen and COD removal from piggery wastewater. Methods and Results: This study was performed in a 17‐litre reactor with a 30% packing ratio, with a ratio of immobilized SU2 cells to sludge of 100 : 1. The ratio of aeration to nonaeration was 4 : 1·5. Removal efficiency of COD was 86·8%. Removal efficiency of BOD and SS was higher than 90%, and removal efficiency of NH 4 + ‐N and TKN was almost 100%. Conclusions: NO 2 – ‐N interference is significant when its concentration in piggery wastewater exceeds 100 mg l –1 . COD in piggery wastewater can be indirectly reduced following nitrite reduction by SU2 strain. Significance and Impact of the Study: Utilizing immobilized SU2 cells in coordination with an SBR system simultaneously reduces nitrite and COD concentrations.