气浮-A²/O-MBR工艺处理校园污水研究——以西安思源学院为例

Gas Float-A²/O-MBR Process on Campus Wastewater Treatment—Taking Xi’an Siyuan College as an Example

摘要: 西安思源学院现运行着4000 m³/天规模的气浮-A²/O-MBR工艺处理校园污水的再生水厂。气浮池内加入定量聚丙烯酰胺与聚合氯化铝混合絮凝剂。为了研究气浮池与MBR膜生物反应器组合优势，对“进水”、“调节池”、“气浮池”和“出水”取样，并检测COD，氨氮，总氮，总磷，动植物油，pH六种项目。计算多次重复测试数据的算术平均值和标准偏差。比较“进水”与“调节池”的标准偏差得到：经过调节池的均质均量，COD的标准偏差下降了近43%，动植物油的标准偏差下降了近77%。比较“调节池”与“气浮池”的测试数据，可以得出通过气浮池，COD下降41.2%，TP下降25.3%和动植物油下降54.5%。从目前测试数据比较来看，在短期内，有无气浮池对MBR膜生物反应器的出水质量影响不明显。因为西安思源学院再生水厂的规模、目的和极限与其它实验室研究不同，所以除了加强混合絮凝剂的选择和性价比的评估方面的研究外，重点将放在对于系统长期的科学观察、科学测试、数据的搜集和整理。

Abstract: Xi’an Siyuan University now operates a 4000 m³/day gas float-A²/O-MBR process to treat campus sewage. Polyacrylamide and polymer aluminum chloride as the mixed flocculants was added to the gas float tank. To investigate the advantages of the combination of gas float tank with MBR biofilm bioreactors, “feed water”, “regulating pool”, “gas floating tank”, and “effluent” were sampled, and COD, ammonia nitrogen, total nitrogen, total phosphorus, animal and plant oil, and pH were tested. The arithmetic mean and standard deviation of the data from multiple repeated tests were calculated. After the homogenization of the regulatory pool, the standard deviation of “feed water” and “regulating pool” showed that: the standard deviation of COD decreased by nearly 43%, and that of animal and plant oil decreased by nearly 77%. Comparison of test data from “regulating pools” to “gas floating tank” yielded a 41.2% decrease in COD, 25.3% in TP, and a 54.5% decrease in animal and plant oil. From the comparison of the current test data, there is no effect of gas float tank on the effluent quality of the MBR biofilm bioreactor in the short term. Because the scale, purpose, and limit of the reclaimed water plant of Xi’an Siyuan University are different from other laboratory studies, in addition to strengthening the selection of mixed flocculant and cost performance evaluation, the focus will be on the long-term scientific observation, testing, data collection and interpretation of the system.