PDF《MBR和BAF 用于城市污水深度 处理的工艺特性比较》

3 组膜帘留有一定空间, 膜帘放 置距离保证膜丝之间有空间能相互摩擦碰撞,以实 现在线机械清洗作用, 膜组件下方设有穿孔曝气管, 形成膜表面水气流的错流流速,错流方式也有助于 减缓膜污染. MBR 运行期间对 TMP 进行了连续监测,结果 表明, TMP 的增长趋势较为缓和, 在运行的

40 d 中, 平均日跨膜压差增长趋势为 0.00032 MPa ・ d-1 ,膜抗 污染程度较强.

4 技术经济分析 4.1 MBR 根据主要设计参数, MBR 的处理水量为 15m3 ・ d-1 . 污水主要处理费用主要为动力费 (电费)和清洗时 所消耗的药剂费用. 动力费: 运行设备中, 包括自吸出水泵, 鼓风机 的日常运行, 同时考虑每季度反洗时所用的反洗泵, 以及一些自控设备的日常电耗. 估算 MBR 的日常电 耗约为

22 kWh・ d-1 , 总电耗为 1.467 kWh・ m-3 , 计电 费为 0.55 元・kWh-1 , 电费为 0.807 元・m-3 . 表2MBR 和BAF 工艺对污水中主要污染物的去除效果比较 Tab.2 Average removal rate of main pollutants in wastewater by MBR and BAF 工艺去除效果 COD BOD5 NH4 + -N TP SS 色度 MBR去除率 /% BAF 去除率 /%

75 70

92 78

95 29

90 82

97 93

94 79 表3出水水质指标及回用标准 Tab.3 Water quality parameters of the effluent and reuse standard 项目 MBR出水 BAF出水 回用标准 COD/mg ・ L-1 BOD5/mg ・ L-1 ρ(SS)/mg ・ L-1 pH 色度 / 倍ρ(NH4 + -N)/mg ・ L-1 ρ(TP)/mg/L 13~23 (17) 2~5 (3) 0~3 (0) 7.6~7.9 (7.8) 2~4 (3) 0.17~2.13(1.04) 0.02~0.23(0.07) 17~26(23) 2~14(6) 3~15(8) 7.7~8.0(7.9) 4~8(6) 7.36~23.58(16.62) 0.08~0.29 (0.18)

60 10 - 6.5~8.5

30 10

1 水处理技术 第36 卷第4期84 PERFORMANCE COMPARISON OF MBR AND BAF USED FOR ADVANCED TREATMENT OF MUNICIPAL WASTEWATER Wang Rongchang, Tong Hao, Zhi Yusheng (State Key Lab of Pollution Control and Resource Reuse, Key Laboratory of Yangtze Aquatic Environment, Ministry of Education,College of Environmental Science and Engineering, Tongji University, Shanghai 200092, China) Abstract:Pilot-scale membrane bioreactor (MBR) and biological aerated filter (BAF) were operated for the purpose of advanced treatment and reuse of municipal wastewater. The results of pilot experiments showed that MBR had much better pollution removal performance than BAF at the average water temperature of 5℃. Removal rates of COD,BOD5,NH4 + -N and TP by MBR system were 75%, 92%, 95% and 90%, respectively. However, the removal rates of COD,BOD5,NH4 + -N and TP by BAF could only achieve 70%、78%、29% and 82%, respectively. The operational costs of MBR and BAF were calculated as 0.82 CNY/ton and 0.55 CNY/ton, respectively. As a conclusion, it is recommended to apply MBR process when wastewater reuse is the main purpose, because MBR has more stable pollutant removal performance, less footprint, and easier to be managed and operated. Keywords: membrane bioreactor (MBR);

biological aerated filter (BAF);

wastewater reuse;

low temperature 药剂费: 所消耗的药剂主要为次氯酸钠 (计600 元・t-1 )和氢氧化钠 (计3000 元・t-1 ). 根据膜生产商 的建议, 每3个月进行

1 次在线清洗, 每半年

1 次离 线清洗.总药剂费为 0.012 元・m-3 .因此, MBR 运行 过程中, 运行费用约为 0.82 元・m-3 . 4.2 BAF 根据设计参数,曝气生物滤池的处理污水量为

20 m3 ・ d-1 .主要处理费用主要为日常运行的电费. BAF 的主要耗电设备为鼓风机同时考虑每季度反 洗时所用的反洗泵 (功率为 1.5 kW),........