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The Oxygenic Photogranule Process for Aeration-Free Wastewater Treatment
Environmental Science & Technology ( IF 10.8 ) Pub Date : 2018-03-09 00:00:00 , DOI: 10.1021/acs.est.8b00403 Ahmed S. Abouhend 1, 2 , Adam McNair 1 , Wenye C. Kuo-Dahab 1 , Christopher Watt 1 , Caitlyn S. Butler 1 , Kim Milferstedt 3 , Jérôme Hamelin 3 , Jeongmi Seo 1, 4 , Gitau J. Gikonyo 1 , Khalid M. El-Moselhy 2 , Chul Park 1
Environmental Science & Technology ( IF 10.8 ) Pub Date : 2018-03-09 00:00:00 , DOI: 10.1021/acs.est.8b00403 Ahmed S. Abouhend 1, 2 , Adam McNair 1 , Wenye C. Kuo-Dahab 1 , Christopher Watt 1 , Caitlyn S. Butler 1 , Kim Milferstedt 3 , Jérôme Hamelin 3 , Jeongmi Seo 1, 4 , Gitau J. Gikonyo 1 , Khalid M. El-Moselhy 2 , Chul Park 1
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This study presents the oxygenic photogranule (OPG) process, a light-driven process for wastewater treatment, developed based on photogranulation of filamentous cyanobacteria, nonphototrophic bacteria, and microalgae. Unlike other biogranular processes requiring airlift or upflow-based mixing, the OPG process was operated in stirred-tank reactors without aeration. Reactors were seeded with hydrostatically grown photogranules and operated in a sequencing-batch mode for five months to treat wastewater. The new reactor biomass propagated with progression of photogranulation under periodic light/dark cycles. Due to effective biomass separation from water, the system was operated with short settling time (10 min) with effective decoupling of hydraulic and solids retention times (0.75 d vs 21–42 d). During quasi-steady state, the diameter of the OPGs ranged between 0.1 and 4.5 mm. The reactors produced effluents with average total chemical oxygen demand less than 30 mg/L. Nitrogen removal (28–71%) was achieved by bioassimilation and nitrification/denitrification pathways. Oxygen needed for the oxidation of organic matter and nitrification was produced by OPGs at a rate of 12.6 ± 2.4 mg O2/g biomass-h. The OPG system presents a new biogranule process, which can potentially use simple mixing and natural light to treat wastewater.
中文翻译：
氧光颗粒法处理无曝气废水
这项研究提出了氧光颗粒（OPG）工艺，这是一种光驱动的废水处理工艺，基于丝状蓝细菌，非光养细菌和微藻的光造粒技术开发而成。与其他需要空运或基于上流混合的生物颗粒工艺不同，OPG工艺在搅拌釜反应器中进行，无需曝气。给反应堆播种静水生长的光颗粒，并以分批分批模式运行五个月以处理废水。在周期性的明/暗循环中，新的反应器生物质随着光粒化的进程而传播。由于有效地从水中分离出了生物质，因此该系统在较短的沉降时间（10分钟）下运行，有效地将水力和固体保留时间解耦（0.75 d对21–42 d）。在准稳态下 OPG的直径在0.1到4.5毫米之间。反应器产生的废水平均总化学需氧量低于30 mg / L。通过生物同化和硝化/反硝化途径实现了脱氮（28-71％）。OPG以12.6±2.4 mg O的速率产生有机物氧化和硝化所需的氧气2 /克生物量-h。OPG系统提出了一种新的生物颗粒工艺，可以潜在地使用简单的混合和自然光来处理废水。
更新日期：2018-03-10
中文翻译：
氧光颗粒法处理无曝气废水
这项研究提出了氧光颗粒（OPG）工艺，这是一种光驱动的废水处理工艺，基于丝状蓝细菌，非光养细菌和微藻的光造粒技术开发而成。与其他需要空运或基于上流混合的生物颗粒工艺不同，OPG工艺在搅拌釜反应器中进行，无需曝气。给反应堆播种静水生长的光颗粒，并以分批分批模式运行五个月以处理废水。在周期性的明/暗循环中，新的反应器生物质随着光粒化的进程而传播。由于有效地从水中分离出了生物质，因此该系统在较短的沉降时间（10分钟）下运行，有效地将水力和固体保留时间解耦（0.75 d对21–42 d）。在准稳态下 OPG的直径在0.1到4.5毫米之间。反应器产生的废水平均总化学需氧量低于30 mg / L。通过生物同化和硝化/反硝化途径实现了脱氮（28-71％）。OPG以12.6±2.4 mg O的速率产生有机物氧化和硝化所需的氧气2 /克生物量-h。OPG系统提出了一种新的生物颗粒工艺，可以潜在地使用简单的混合和自然光来处理废水。
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