Concurrent Removal Nitrogen and Phosphorus of Wastewater in Continuous-flow Chemical Precipitation Method Connect with O/A2/O Procedure

• Main Authors: Hung-Wei Siao, 蕭宏偉
• Other Authors: Chun-Mei Lu
• Format: Others
• Language: zh-TW
• Published: 2014
• Online Access: http://ndltd.ncl.edu.tw/handle/21788616017015178223

碩士 === 國立勤益科技大學 === 化工與材料工程系 === 102 === In a wastewater treatment system, wish to simultaneous removal of organic carbon, nitrogen , and phosphorus is really have some contradictions (such as treatment procedures and physiological properties of microorganisms ). Therefore, how to achieve this goal is a major topic on wastewater treatment in the current. In this study, a continuous-flow method treatment system was composed of chemical precipitation connect with activated sludge process, in order to investigate organic carbon, nitrogen and phosphorus removal efficiency in wastewater. Our activated sludge process can form three different procedures; these are A2/O, O/A/O and O/A2/O, respectively. HRT of chemical precipitation is 2.5 hr, adding 2.0 ％ of calcium hydroxide as a coagulant to regulate pH of synthetic wastewater from 5.6 to 8.6. HRT is 7.5 hr on subsequent activated sludge process. So, system total HRT is 10 hr. The connect with A2/O procedure has the lowest removal capacity; the removal efficiency of TP , PO43-, NH4+-N, and COD is 38.8 %, 39.4 %, 40.1 %, and 52.6 %. The connect with O/A/O procedure has the optimum removal capacity of NH4+-N; the removal efficiency of TP , PO43-, NH4+-N, and COD is 52.9 %, 53.2 %, 60.9 %, and 56.7 %. When connect with O/A2/O procedure, the removal efficiency of TP , PO43-, NH4+-N, and COD is 62.1 %, 61.8 %, 56.3 %, and 85.0 %. O/A2/O procedure compared to O/A/O procedure. Although removal efficiency of NH4+-N decreased slightly; but the removal efficiency of TP was improved 9.2 %; and the removal efficiency of PO43- was improved 8.6 %; and he removal efficiency of COD was improved 28.3 %. Which may be due to the O/A2/O procedure had complete process, relatively. So the inhibiting effect of Nitrite or Nitrate against PAOs was feeble; and enable more carbon source could be utilized by microorganisms, than other procedures.