The Research of Low Carborn Sources/High DO Sewage Nutrient Removal by Using Integrated Biological Processes

• Main Authors: Wen-Shang Chou, 周文祥
• Other Authors: 張添晉
• Format: Others
• Language: zh-TW
• Published: 2010
• Online Access: http://ndltd.ncl.edu.tw/handle/g9bc67

博士 === 國立臺北科技大學 === 工程科技研究所 === 98 === The low carborn sources/high DO sewage always decreases the BNR process nutrient removal efficiency. In this study, a ISD-RBC denipho unit（Integrate Sludge Digestion with RBC denitrogen-phosphorus unit）and MBR(Membrane Bioreactor) was operated to overcome low carborn sources/high DO problems and to investigate nutrient removal characteristics, partial nitrification/denitrification, anammox reaction performance. The results of the experiments showed that the phosphate can’t be removed by biological process used by no mater ISD-RBC or MBR, because of the anaerobic and aerobic (A/O) process can’t be achieved. The PO4-P removal quantities were taked to synthesize biomass. The results of ISD-RBC experiments showed that if the operated temperature didn’t control to 30-35℃, the nitrification reaction would be trended to completely nitrification. As the PO4-P influent concentration between 1.3-1.7 mg/l, in order to achieve the phosphate effluent concentration reduced to 1 mg/l below, the HRT needed to be greater than 0.92 hour and TCOD/PO4-P needed to be greater than 37.2. The specific NH4-N nitrification rate was 23-43 mg NH4-N/m2．hr. As the TCOD/NH4-N ratio from 5 to 9, SCOD/NH4-N ratio from 4 to 8, the specific NH4-N nitrification rate would decrease 50%. As the TN influent concentration between 14.8-18.1 mg/l, in order to achieve the TN removal rate to 50% and 75% respectively, the HRT needed to be 8 and 19 hours respectively. As increased the ISD-RBC operated temperature to 30-35℃, there was NO2-N accumulated and denitrification to occur. There were nutrient removal related bacteria identified in SRBC1 and SRBC2 plate by using PCR, DGGE and 16S rRNA sequencing showed that were similar to Rhodocyclus group（DNPAO）、Unclassified Gammaproteobacteria and Anommox bacterium clone 2（AY518553）, the similarity were greater than 90%. The results of MBR experiments showed that, there was no NO2-N accumulated to occur, because of high DO(3.4-5.8 mg/l) in MBR. The TN removal rate was 75-80%, and the TN removal quqntities TNr(mg/l)=-2.308ln(SCOD/TN) +11.484. The phosphate removal rate was 21.5-25.7%.