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首页> 美国卫生研究院文献>Membranes >Influence of Ozone Treatment on Ultrafiltration Performance and Nutrient Flow in a Membrane Based Nutrient Recovery Process from Anaerobic Digestate
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Influence of Ozone Treatment on Ultrafiltration Performance and Nutrient Flow in a Membrane Based Nutrient Recovery Process from Anaerobic Digestate

机译：膜处理对厌氧消化膜回收养分过程中超滤性能和养分流的影响

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摘要

Membrane filtration of biological suspensions is frequently limited by fouling. This mechanism is well understood for ultrafiltration of activated sludge in membrane bioreactors. A rather young application of ultrafiltration is the recovery of nutrients from anaerobic digestates, e.g., from agricultural biogas plants. A process chain of solid/liquid separation, ultrafiltration, and reverse osmoses separates the digestate into different products: an organic N-P-fertilizer (solid digestate), a recirculate (UF retentate), a liquid N-K-fertilizer (RO retentate) and water. Despite the preceding particle removal, high crossflow velocities are required in the ultrafiltration step to overcome fouling. This leads to high operation costs of the ultrafiltration step and often limits the economical application of the complete process chain. In this study, under-stoichiometric ozone treatment of the ultrafiltration feed stream is investigated. Ozone treatment reduced the biopolymer concentration and apparent viscosity of different digestate centrates. Permeabilities of centrate treated with ozone were higher than without ozone treatment. In a laboratory test rig and in a pilot plant operated at the site of two full scale biogas plants, ultrafiltration flux could be improved by 50–80% by ozonation. Nutrient concentrations in the fertilizer products were not affected by ozone treatment.
机译：生物悬浮液的膜过滤通常受结垢的限制。对于膜生物反应器中的活性污泥的超滤，该机理是众所周知的。超滤的一种较年轻的应用是从厌氧消化物中，例如从农业沼气厂中回收养分。固/液分离，超滤和反渗透的过程链将消化物分为不同的产品：有机N-P肥料（固体消化物），再循环（UF渗余物），液态N-K肥料（RO渗余物）和水。尽管除去了前面的颗粒，但在超滤步骤中仍需要较高的错流速度以克服结垢。这导致超滤步骤的高运行成本，并且经常限制整个工艺链的经济应用。在这项研究中，研究了超滤进料流的化学计量不足的臭氧处理方法。臭氧处理降低了不同消化液的生物聚合物浓度和表观粘度。用臭氧处理的浓缩液的渗透率高于未用臭氧处理的浓缩液。在实验室试验台上和在两个大型沼气厂现场运行的中试工厂中，臭氧处理可使超滤通量提高50-80％。化肥产品中的养分浓度不受臭氧处理的影响。

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