Anaerobic Biotechnology for Domestic Wastewater Treatment—Explore the Degradation of Sugars, Proteins and Lipids

• Main Authors: Jong-Che WU, 吳榮哲
• Other Authors: Cheng-Fang LIN
• Format: Others
• Language: zh-TW
• Published: 2019
• Online Access: http://ndltd.ncl.edu.tw/handle/pa2am3

碩士 === 國立臺灣大學 === 環境工程學研究所 === 107 === This research, the fixed anaerobic biological treatment module was used to test the continuous influent of the whole domestic wastewater. The operating temperature was set to 25 °C, and the results were analyzed in four phases of hydraulic retention time (HRT) at 16, 12, 8 and 6 hours. The results showed that the total average removal rate of chemical oxygen demand (TCOD) was 76.5% and for the average removal rate of each phase, the average removal rate at HRT of 16 hours was 75.5%, 76.3% at HRT of 12 hours, 78.7% at HRT of 8 hours and 74.6% at HRT of 6 hours. At HRT of 6 hours and the operating condition of sudden load increase, the average TCOD of effluent was 62 mg/L (maximum 77 mg/L and minimum 49 mg/L), which was consistent with the emission standards for chemical oxygen demand of the discharged water (COD, 100mg/L), showing the stability of the fixed anaerobic biological treatment system for sudden load increase and low hydraulic retention time (HRT) that satisfied the current demand of domestic wastewater treatment via the fixed anaerobic biological treatment system. Such system does not require continuous aeration and the production of waste sludge is extremely low, which conserves electricity and tremendously reduces the sludge disposal cost. The analytic results of major organic components in three types of domestic wastewater, such as sugars, proteins and lipids, showed that the reduction rate of sugars and proteins could achieve more than 80% under the operating condition of any hydraulic retention time, where the level of lipids could only be maintained between 40% and 60%. It was obvious that the removal efficiency of lipids was the limiting factor for the fixed anaerobic biological treatment system. The improvement to degradation efficiency of lipids in the co-degradation effect of sugars, proteins and lipids is the key issue to enhance the overall effectiveness of the fixed anaerobic biological treatment system.