Novel ellipsoid-like granules exhibit enhanced anammox performance compared to sphere-like granules

IF 7.2 2区 环境科学与生态学 Q1 ENGINEERING, ENVIRONMENTAL Water Research X Pub Date : 2024-10-30 DOI:10.1016/j.wroa.2024.100270
Dongdong Xu , Tao Liu , Chao Pan , Leiyan Guo , Jianhua Guo , Ping Zheng , Meng Zhang
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Abstract

Anammox granular sludge (AnGS) serves as an important platform for cost-effective nitrogen removal from wastewater. Different to the traditionally sphere-like granules, a novel type of AnGS in a unique ellipsoid-like shape was obtained through enhancing shear force. The ellipsoid-like AnGS significantly exhibited a smaller aspect ratio (-25.1 %) and granular size (-11.8 %), compared to traditional sphere-like AnGS (p < 0.01). Comprehensive comparisons showed that ellipsoid-like AnGS possessed a significantly higher extracellular polymeric substances (EPS) content and strength, as well as an enhanced mass transfer and a higher viable bacteria proportion due to the larger substrate permeable zone (p < 0.01). Additionally, the anammox bacterial abundance (Candidatus Kuenenia) was 12.2 % higher in ellipsoid-like AnGS than in sphere-like AnGS. All these characteristics of ellipsoid-like AnGS jointly increased the specific anammox activity by 29.0 % and nitrogen removal capacity by 22.6 %, compared to sphere-like AnGS. Further fluid field simulation suggested the enhanced flow shear on the side surface of AnGS likely drove the formation of ellipsoid-like AnGS. The higher shear force on the side surface led to an increase of EPS content (especially hydrophobic protein) and elastic modulus, thus constraining lateral expansion. This study sheds light on impacts of granular shape, an overlooked morphological factor, on anammox performance. The ellipsoid-like AnGS presented herein also offers a unique and promising aggregate to enhance anammox performance.

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与球形颗粒相比,新型椭圆形颗粒具有更强的厌氧性能
氨氧化颗粒污泥(AnGS)是经济有效地去除废水中氮的重要平台。与传统的球形颗粒不同,通过增强剪切力获得了一种独特的椭圆形的新型 AnGS。与传统的球形 AnGS 相比,椭圆形 AnGS 的长宽比(-25.1%)和颗粒尺寸(-11.8%)明显更小(p < 0.01)。综合比较显示,椭圆形 AnGS 的胞外聚合物质(EPS)含量和强度明显更高,同时由于基质渗透区更大,传质能力更强,存活细菌比例更高(p <0.01)。与球形 AnGS 相比,椭圆形 AnGS 的所有这些特征共同提高了 29.0% 的特定 Anammox 活性和 22.6% 的脱氮能力。进一步的流场模拟表明,AnGS 侧表面的流动剪切力增强可能是椭圆形 AnGS 形成的原因,侧表面较高的剪切力导致 EPS 含量(尤其是疏水蛋白)和弹性模量增加,从而限制了横向扩展。这项研究揭示了颗粒形状这一被忽视的形态因素对 Anammox 性能的影响。本文介绍的椭圆形 AnGS 还提供了一种独特而有前景的骨料,可提高厌氧性能。
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来源期刊
Water Research X
Water Research X Environmental Science-Water Science and Technology
CiteScore
12.30
自引率
1.30%
发文量
19
期刊介绍: Water Research X is a sister journal of Water Research, which follows a Gold Open Access model. It focuses on publishing concise, letter-style research papers, visionary perspectives and editorials, as well as mini-reviews on emerging topics. The Journal invites contributions from researchers worldwide on various aspects of the science and technology related to the human impact on the water cycle, water quality, and its global management.
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