【摘要】 基于北京市最新地方污染物排放标准,采用A2/O—MBR工艺开展对生活污水的净化效果研究。结果表明,提高好氧池DO浓度可使COD、NH3—N和TP去除率均有所增加,TN先增长后下降;提高内回流比对COD、NH3—N和TP等指标的去除效果并不显著,但TN去除率有所提高;延长HRT可在一定程度上提高COD、NH3—N和TN去除率,但增幅呈下降趋势。膜污染速率随运行时间增加,提高膜通量将加速膜污染,主要由于混合液性能变化致使膜过滤阻力增长。在DO浓度为2.0mg/L、内回流比为250%、HRT为9h的系统优化参数下,经臭氧消毒20min后,工艺出水稳定且主要水质指标满足《北京市城镇污水处理厂污染物排放标准》(DB 11890—2012)的新建污水处理厂A标准。更多还原

【Abstract】 Based on the recent issued discharge standard of water pollutants for WWTPs in Beijing,this study investigated study on the effectiveness and feasibility of domestic wastewater purification and reclamation by using A2/O- MBR technology.Experimental results showed that increasing DO concentration of the aerobic unit resulted higher COD,NH3-N and TP removal,but TN removal showed initial increasing followed by decreasing profile.The effect of internal reflux ratio on COD,NH3-N and TP removal is not significant,but TN removal increased by internal reflux ratio increasing.Extension of HRT could improve COD,NH3-N and TN removal in a certain extent,but the growth rate showed a downward trend.Membrane fouling of MBR increased with the increase of operation time,and higher membrane flux will accelerate membrane fouling,mainly due to changes in mixed liquor properties and the resulted filtration resistance growth.Under the optimistic condition of DO 2.0mg/L,inner reflux ratio 250%and HRT 9hours,the effluent after ozone disinfection of 20 min ensured the stability and the effluent water quality meet class A standard of the local standard of Beijing(DB 11890-2012).更多还原