Hydrodynamic granulation of oxygenic photogranules
Hydrodynamic granulation of oxygenic photogranules
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DOI：
10.1039/d0ew00957a
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发表时间：
2021-02-01
影响因子：
5
通讯作者：
Park, Chul
中科院分区：
文献类型：
--
作者：
Gikonyo, Joseph G.;Ansari, Abeera A.;Park, Chul
产氧光颗粒（OPGs）是一种由光养和化养微生物组成的颗粒组合，具有自曝气潜力，是一种很有前途的废水处理生物技术。目前，种子OPG是在静水条件下用活性污泥接种生产的。我们采用不同的光照、剪切和接种条件，研究了在水动力条件下OPGs的发育。结果表明，活性污泥中OPGs的水动力造粒，为快速（少于8天）和批量开发提供了机会。从所研究的条件矩阵中，我们发现只有这些输入能量的不同大小的某些组合才会发生造粒。例如，在不同剪切条件下，采用x4稀释接种剂结合弱光支撑造粒。然而，高光高剪切的x4稀释接种剂不支持造粒。这种应用条件下观察到的差异表明，OPG造粒只有在可变诱导能量压力和选择球形聚集体的生物反应的有利相互作用下才会发生。对沉淀5分钟至30分钟污泥体积指数（一种制粒指标）的时间变化进行多元回归分析，证实了这些能量输入对OPG制粒的相互关系。这种造粒方案依赖于选择压力的金发姑娘相互作用，可以潜在地扩展到废水处理中应用的其他颗粒。
Oxygenic photogranules (OPGs), granular assemblages of phototrophic and chemotrophic microbes, offer a promising biotechnology for wastewater treatment with self-aerating potential. Currently, the seed OPG is produced under hydrostatic conditions with activated-sludge inoculum. We investigated the development of OPGs under hydrodynamic conditions employing batches with different light, shear, and inoculum conditions. The results demonstrated hydrodynamic granulation of OPGs from activated sludge, presenting opportunities for rapid (less than 8 days) and bulk development. From the matrix of conditions investigated, we found that granulation occurs only with some combinations of different magnitudes of these input energies. For example, x4 dilute inoculum combined with low light supported granulation under the different shear conditions utilized. However, x4 dilution inoculum with high light and high shear did not support granulation. This observed disparity in applied conditions suggests that OPG granulation ensues only with favorable interaction of variable induced energy pressures coupled with biological response selecting for spheroidal aggregates. Multi-regression analysis on temporal changes in the ratio of sludge volume index for 5 min to 30 min settling, a metric for granulation, confirmed the intercorrelation of these energy inputs on OPG granulation. This granulation scheme, dependent on goldilocks interaction of selection pressures, can potentially be extended to other granules applied in wastewater treatment.