| 藻-菌颗粒污泥工艺在自然光昼夜交替条件下处理含复杂有机物生活污水的效能及机理研究 |
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| 引用本文： | 石钰婷,季斌,王初初,苗璟仁,孙冲,杜志宇.藻-菌颗粒污泥工艺在自然光昼夜交替条件下处理含复杂有机物生活污水的效能及机理研究[J].环境科学研究,2021,34(10):2412-2418. |
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| 作者姓名： | 石钰婷 季斌 王初初 苗璟仁 孙冲 杜志宇 |
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| 作者单位： | 武汉科技大学城市建设学院, 湖北 武汉 430065 |
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| 基金项目： | 湖北省大学生创新创业训练计划项目S201910488009国家自然科学基金项目51808416 |
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| 摘 要： | 藻-菌颗粒污泥（MBGS）工艺是一种节能环保的新型污水处理工艺，当前关于该工艺的研究主要集中于连续光照、间歇式反应器及含简单有机物的模拟污水，对其在昼夜交替条件处理含复杂有机物污水的研究鲜有报道，从而极大地限制了MBGS工艺的进一步工程应用.该文采用连续流的管式光生物反应器（直径2.3 cm、管长50 cm、容积200 mL），探究了在自然光昼夜交替条件下MBGS工艺处理含复杂有机物（蛋白胨、酵母提取物、淀粉和尿素）的模拟市政污水的效能及机制.结果表明:①在白天平均进水ρ（COD）、ρ（NH4+-N）、ρ（TN）和ρ（PO43--P）分别为219.4、20.0、41.4和3.0 mg/L，晚上平均进水ρ（COD）、ρ（NH4+-N）、ρ（TN）和ρ（PO43--P）分别为237.0、21.2、43.7和3.0 mg/L的条件下，白天COD和PO43--P的平均去除率分别为77.1%和87.2%，其相应的夜晚平均去除率分别为88.0%和42.7%；TN在昼夜间的平均去除率均低于30%.②进一步分析表明，MBGS可在昼夜交替条件下调节系统DO浓度，从而实现MBGS系统的自我维持和COD的高效去除，COD在白天和晚上的平均去除速率分别约为0.34和0.42 kg/（m3·d）.③Miseq测序结果表明，拟杆菌纲（Bacteroidia）、热带单胞菌属（Tropicimonas）和四膜虫属（Tetrahymena）丰度增高，可促进复杂有机物的降解.研究显示，MBGS工艺可以在自然光昼夜交替条件下实现有机物的高效去除，适用于碳氮比约为5的生活污水的处理.
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| 关 键 词： | 藻-菌颗粒 昼夜交替 市政污水 复杂有机物 碳氮比 |
| 收稿时间： | 2021-04-20 |
Performance and Mechanism of Microalgal-Bacterial Granular Sludge Process for the Treatment of Domestic Wastewater Containing Complex Organic Matter under Natural Day-Night Conditions |
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| Affiliation: | School of Urban Construction, Wuhan University of Science and Technology, Wuhan 430065, China |
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| Abstract: | Microalgal-bacterial granular sludge (MBGS) process is a novel energy-saving and environmentally friendly wastewater treatment process. The current research on this process mainly is focused on continuous light, batch reactors and simulated wastewater containing simple organic matters. However, there are few reports on the treatment of wastewater containing complex organic matter under natural day-night conditions, which greatly limits the further engineering application of the MBGS process. In this research, a continuous-flow tubular photobioreactor (diameter 2.3 cm, length 50 cm, volume 200 mL) was used to explore the MBGS process for the treatment of simulated municipal wastewater containing complex organic matters (peptone, yeast extract, starch and urea) under natural day-night conditions. The results showed that: (1) When the average influent COD, NH4+-N, TN and PO43--P concentration was 219.4, 20.0, 41.4 and 3.0 mg/L during the day, the average influent COD, NH4+-N, TN and PO43--P concentration was 237.0, 21.2, 43.7 and 3.0 mg/L during the night, the average removal efficiencies of COD and PO43--P during the day were 77.1% and 87.2%, respectively, while the corresponding average removal efficiencies at night were 88.0% and 42.7%, respectively. The average removal efficiencies of TN during the day and night were less than 30%. (2) Further analysis showed that the MBGS could balance the dissolved oxygen concentration under natural day-night conditions, so as to achieve the self-sustainability of the MBGS system and the efficient COD removal. The average removal rate of COD during the day and night was estimated at 0.34 and 0.42 kg/(m3·d), respectively. (3) The increased abundance of Bacteroidia, Tropicimonas and Tetrahymena promoted the degradation of complex organic matter. This study showed that the MBGS process can achieve efficient removal of organic matter under natural day-night conditions, which is suitable for the treatment of domestic wastewater with a carbon to nitrogen ratio of about 5. |
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