| Summary: | 碩士 === 國立成功大學 === 環境工程學系 === 107 === The removal of nitrogenous compounds (e.g., n-methyl-pyrrolidone, NMP) in semiconductor wastewater is getting more concern. The purposes of this study are to investigate the COD removal and nitrogen removal of NMP-containing wastewater in a full-scale wastewater treatment plant and to evaluate the feasibilities for treating NMP-containing wastewater under aerobic, anoxic and anaerobic conditions, respectively.
Batch results indicate that nitrification was completely inhibited when initial NMP concentration was higher than 1000 mg/L. In anoxic condition, denitrification works after acclimation but was limited at high NMP concentration due to substrate inhibition, where maximum specific degradation rate of COD and NMP could achieve 27.0 g/g VSS-h and 18.2 g/g VSS-h, respectively, with initial NMP concentration of 2000 mg/L. Meanwhile, the organic loading capacity and nitrogen removal were improved in full-scale wastewater treatment plant when increasing Food-to-Microorganism Ratio (F/M) and spiking additional phosphate.
The results of lab-scale anaerobic reactor show that the anaerobic reactor can degrade NMP-containing wastewater with 96% of removal both on COD and NMP under 249 mg COD/L/d of organic loading capacity. In this study, we also conducted anaerobic batch experiments using NMP as the only carbon source to evaluate the degradability and the biochemical methane potential of NMP in anaerobic condition.
Keyword: NMP, nitrogenous organic compounds, biological treatment, anaerobic reactor
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