| 摘要: | 這項研究的主要目的是研究生物載體-好氧MBR系統對合成廢水除磷的的效果。主要操作因子為污泥回流率、COD/ TP比和SRT。合成廢水性包含主要養分（含N和P），鹼度控制（碳酸氫鈉），和其他微量元素。進流廢水初始濃度COD = 204 ± 21 mg/L，TP = 30.4 ± 4.6 mg/L和TN = 55.8 ± 7.2 mg/L。反應系統包括兩個總體積為18升的反應槽，第一反應槽是6升的無氧池，利用海綿作為生物載體的生物槽, 而第二反應槽是12升的好氧膜生物反應槽。無氧槽和好氧膜生物反應槽的操作水力停留時間為3小時和6小時， SRT在階段1-3中控制在20天，階段4中控制在10天。所有實驗均在pH值範圍為7.5至8.0，溫度為25℃，溶解氧（DO）的濃度，無氧槽低於0.3 mg / L，好氧膜生物反應槽高於2.0毫克/升。此外，進水的COD濃度的調整和控制視COD/ TP比而定。 本研究在不同有機碳負荷下分成四個階段，生物載體 - 好氧MBR操作為299天，提高污泥回流率從2Q 上升到2.5Q ，SRT從20天下降到10天。最高總磷（TP）去除率為97％，COD和PO43--P分別為100％和97％。研究結果顯示，提高 COD/ TP比值導致磷的去除效率增加。降低溫度的影響PO43--P 磷的釋放，而高溫影響PO43--P的生物攝取。過率液PO43--P濃度為1.58毫克/升。此外，PO43--P 濃度在MBR槽體的濃度極低，表明有效的PO43--P 的生物攝取（> 90％）。研究結果亦顯示，過濾液P的濃度極低，未來可由污泥中回收磷。
The main objective of this study was to investigate the performance of a biocarrier-aerobic MBR system on phosphorus removal from synthetic wastewater. Operational parameters such as sludge recycling rate, COD/TP ratio and SRT were assessed. A synthetic wastewater, which contained macro nutrients (N and P), alkalinity control (NaHCO3), and other microelement solutions, was used in this study. The feed wastewater had initial concentrations of COD = 204 � 21 mg/L, TP = 30.4 � 4.6 mg/L and TN = 55.8 � 7.2 mg/L. The experiments were conducted using the biocarrier-aerobic MBR system that consisted of two compartments with a total volume of 18 L. The first compartment was a 6 L anoxic tank with sponges as biocarrier, while the second compartment was a 12 L aerobic membrane bioreactor (MBR). The anoxic and MBR reactors were operated at HRT of 3 and 6 h, respectively, while SRT was controlled at 20 days in phases 1 to 3 and 10 days in phase 4. All experiments were performed within a pH range of 7.5-8.0, temperature of 25oC, and dissolved oxygen (DO) concentrations lower than 0.3 mg/L in the anoxic tank and higher than 2.0 mg/L in the MBR tank. In addition, the influent COD concentration was adjusted and controlled depending on the COD/TP ratio. The biocarrier-aerobic MBR process was operated for 299 days with 4 phases under different organic carbon loadings, increasing recycling rates from 2Q to 2.5Q, and declining SRT from 20 to 10 days. The highest total phosphorus (TP) removal efficiency was 97% where COD and PO43--P were 100% and 97%, respectively. The effects of four important operational parameters, namely COD/TP ratios, temperature, biomass and SRT were also investigated. Increasing the COD/TP ratios resulted in an increase in phosphorus removal efficiency. Lowering the temperature affected PO43--P release, while high temperature affected PO43--P uptake. The permeate PO43--P concentration was found to have a value of 1.58 mg/L. Moreover, PO43--P concentration in the MBR tank was at the lowest level, indicating an efficient PO43--P uptake (>90%). The residual P in permeate also showed high possibilities of phosphorus recovery from sludge in the future. |
