自生动态膜与生物反应器耦合在厌氧氨氧化工艺中的应用,Environmental Science & Technology

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自生动态膜与生物反应器耦合在厌氧氨氧化工艺中的应用
Environmental Science & Technology ( IF 10.8 ) Pub Date : 2019-10-16 , DOI: 10.1021/acs.est.9b04314
Yijing Zhu ₁ , Lijuan Cao ₁ , Yayi Wang ₁

Affiliation

提出了一种新型的厌氧氨氧化自形成动态膜生物反应器（SFDMBR），以实现具有高生物质保留率和成本效益的操作的高效厌氧氨氧化工艺。在尼龙网片上形成的滤饼层（孔径为20–25μm）被称为动态膜（DM）。DM层的高渗透性导致较低的跨膜压（TMP），在82天的一个过滤循环中，该膜在50天内保持低于10 kPa的压力。与使用聚偏二氟乙烯（PVDF）微滤膜的MBR中的高TMP（主要> 20 kPa）相比，SFDMBR可以显着节省能量。此外，成熟的DM层可实现与PVDF膜相当的有效生物质保留能力，有利于厌氧菌的富集。同时，SFDMBR中达到了^–1 VSS）。根据特定的过滤阻力（SFR）分析，降低散装污泥中的EPS浓度可提高污泥的可过滤性并减轻结垢，这是在SDM为1.47×10 ¹² m ^–1 ·kg ^–1的低SFDMBR系统中实现的。我们的结果表明，高性价比的操作和技术优势使anammox SFDMBR有望用于实际应用。

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Characteristics of a Self-Forming Dynamic Membrane Coupled with a Bioreactor in Application of Anammox Processes

A novel anammox self-forming dynamic membrane bioreactor (SFDMBR) was proposed to achieve an efficient anammox process with high biomass retention and cost-effective operation. The cake layer formed on nylon mesh (pore size, 20–25 μm) was referred to as a dynamic membrane (DM). The high permeability of the DM layer contributed to low transmembrane pressure (TMP), which kept below 10 kPa for 50 days in one filtration cycle of 82 days. Compared to the high TMP (mainly > 20 kPa) in the MBR using polyvinylidene fluoride (PVDF) microfiltration membrane, energy can be significantly conserved in the SFDMBR. Besides, the mature DM layer achieved efficient biomass retention comparable to that of PVDF membrane, which favored anammox bacteria enrichment. Concomitantly, an appropriate microenvironment for autotrophic anammox bacterial growth with well-controlled extracellular polymeric substances (EPS) concentration (33.22 mg·g^–1 VSS) was achieved in SFDMBR. According to specific filtration resistance (SFR) analysis, reducing the EPS concentration in the bulk sludge improves sludge filterability and alleviate fouling, which was achieved in the SFDMBR system with a low SFR of 1.47 × 10¹² m^–1·kg^–1. Our results show that the cost-effective operations and technical merits make anammox SFDMBRs promising for practical applications.

更新日期：2019-10-17

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