膜生物反应器处理医院污水及氯消毒效果评价

Evaluation on chlorination effect and halogenated hydrocarbon production of hospital wastewater treated by membrane bioreactor

摘要:
目的研究膜生物反应器(MBR)工艺处理医院污水在消毒效果和安全方面的优越性。
方法采用天津市第一中心医院的原MBR出水, 投加次氯酸钠消毒, 测定消毒前后水样细菌学指标, 并用顶空-气相色谱法测定水中卤代烃含量。
结果原污水和MBR出水的适宜投氯浓度、接触时间以及相应的卤代烃含量分别为14.0 mg/L、60mm、26.40μg/L和1.0 mg/L, 1.5 min, 7.98μg/L。
结论医院原污水消毒不应盲目加大投氯量和接触时间, 采用MBR处理医院污水是有效减少消毒剂使用量、提高消毒效率、降低消毒副产物生成量的好方法。

Abstract:
Objective To study the advantages that membrane bioreactor(MBR)was used in disinfection of hospital waste water.
Methods Plate count for the tolal bacteria, filter membrane method for the fecal coliform group and headspace gas chromatography for the halogenated hydrocarbon.
Results The proper dose of sodium hypochlorie, contact time, total halogenated hydrocarbon production after disinfection of influent and effluent were 14.0 mg/L, 60 mm, 26.40μg/L and 1.0 mg/L, 1.5 min, 7.98μg/L respectively.
Conclusion Higher disinfectant efficiency and less disinfection by-products(DBPs) production were achieved as for disinfection of MBR effluent at lower dose of disinfectant.For better disinfect effect of hospital wastewater, the dose of disinfectant and contact time could not be intensified bindly.