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首页> 外文会议>2011 Membrane technology conference amp; exposition. >Ozone Pretreatment of a Non-Nitrified Secondary Effluent before Microfiltration
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Ozone Pretreatment of a Non-Nitrified Secondary Effluent before Microfiltration

机译：微滤前臭氧对非硝化二级废水的预处理

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Microfiltration (MF) is a unit process commonly used to treat municipal wastewater effluentrnto indirect potable reuse standards. Organic fouling is a significant factor that affects MFrnflux, cleaning frequencies, and membrane replacement intervals. At West Basin MunicipalrnWater District’s Edward C. Little Water Recycling Facility (ECLWRF), MF fouling by arnnon-nitrified secondary effluent source water has significantly impacted treatment designrncapacity and clean-in-place (CIP) frequencies. One approach for improving MF performancernis to pretreat the feed water with ozone to remove organics that cause fouling. However, thisrnapplication of ozone technology is uncommon and there are few references on the subject.rnTherefore, pilot testing was performed to evaluate the feasibility of using ozone to restorernMF performance at ECLWRF to its original design flux (～20 gfd) and CIP frequency (2 torn3 weeks). An average applied ozone dose of 12 to 15 mg/L was shown to reduce ultravioletrnabsorbance at 254 nm and turbidity by an average of 24% and 38%, respectively. Significantrnamounts of humic matter and protein-like organics were also removed by ozonation. Parallelrntesting of MF pilot units with and without ozone pretreatment demonstrated the significantrnbenefits of ozonation. The MF unit without ozone pretreatment operated at 19.3 gfd for 2 torn3 days before a high transmembrane pressure (14.2 psi) caused it to shutdown automatically,rnbut the MF unit with ozone pretreatment (12 mg/L applied dose) was able to run at 20 gfd forrn21 days. These results indicate ozone has the potential to restore the MF performance atrnECLWRF to its original design flux and CIP frequency. Additional research is required tornoptimize the applied ozone dose, develop an ozone dose control system, characterize thernorganics responsible for MF fouling, evaluate the effect of ozone pretreatment on reversernosmosis membranes downstream of MF, and investigate the impact of this application ofrnozone on contaminants of emerging concern and N-nitrosodimethylamine formation.
机译：微滤（MF）是一种单位工艺，通常用于将市政废水污水处理为间接的饮用水回用标准。有机污垢是影响MFrnflux，清洁频率和膜更换间隔的重要因素。在西盆地市政水区的爱德华·C。小水循环设施（ECLWRF）中，阿尼翁硝化的二次污水源水造成的中频污染严重影响了处理设计的能力和就地清洁（CIP）频率。一种提高MF性能的方法是用臭氧对给水进行预处理，以除去引起结垢的有机物。但是，这种臭氧技术的应用并不常见，因此在该主题上的参考文献很少。因此，进行了中试测试，以评估使用臭氧将ECLWRF的MF性能恢复至其原始设计通量（〜20 gfd）和CIP频率（2）的可行性。撕裂3周）。结果表明，平均施加臭氧剂量为12至15 mg / L可使254 nm处的紫外线吸光度和浊度分别平均降低24％和38％。臭氧化处理还去除了大量腐殖质和类似蛋白质的有机物。带有和不带有臭氧预处理的MF中试装置的并行测试表明，臭氧化具有明显的好处。未进行臭氧预处理的MF装置在高跨膜压力（14.2 psi）导致其自动关闭之前，在19.3 gfd下运转了2撕裂3天，但是经过臭氧预处理的MF装置（施加剂量12 mg / L）能够在20 gfd forrn21天。这些结果表明，臭氧有可能将rnECLWRF的MF性能恢复到其原始设计通量和CIP频率。需要进一步研究以优化所应用的臭氧剂量，开发臭氧剂量控制系统，表征负责中频污染的有机物，评估臭氧预处理对中频下游反渗透膜的影响，并研究这种应用的zone对新兴污染物的影响。和N-亚硝基二甲胺的形成。

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