| 引用本文: | 李源，杨娜，王趁义，于洁，李平，陈咨霖.2021.多功能便捷式水下化学增氧器的研制及其净水效果研究[J].地球环境学报,12(5):566-572 |
| LI Yuan, YANG Na, WANG Chenyi, YU Jie, LI Ping, CHEN Zilin.2021.Development of a multifunctional and portable underwater chemical oxygenator and its water purification effect[J].Journal of Earth Environment,12(5):566-572 |
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| 摘要: |
| 机械增氧作为一种常规增氧技术曾得到广泛应用，但其能耗高、扰动大、影响水运和自然美观，且对水下增氧能力有限。为了提高水下溶解氧（DO）水平，本文利用自行设计的一种兼有脱氮除磷作用的便捷式水下化学增氧器来探讨其最优增氧条件，并对比了水下化学增氧器（装置组）、机械增氧曝气机（曝气组）和未增氧水体（空白组）的水质情况。结果表明：装置组在30% H2O2、25 g Na2CO3、放置深度为60 cm、增氧器中混合矿物材料质量为2.4 kg的最优条件下，对受试水体经过18 d的处理，水下溶解氧（DO）能维持在3 mg·L−1左右，对受试水体中的总氮（TN）、总磷（TP）、氨氮（NH4+-N）和高锰酸盐指数的去除率分别为55.86%、71.45%、61.70%和82.04%，表现出较好的净水效果。但装置组的DO浓度低于曝气组，这可能与最优条件下控制了液体增氧剂的滴速，以延缓DO的释放速度，提高O2利用率，减少对土著微生物的扰动破坏有关。本研究为充分发挥水下化学增氧器的增氧作用，为黑臭水体的修复实践提供了一种新技术和新装备。 |
| 关键词: 水下增氧器 化学增氧 机械增氧 环境矿物 最优增氧条件 脱氮除磷效果 |
| DOI：10.7515/JEE212013 |
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| 基金项目:国家自然科学基金项目（21207036） |
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| Development of a multifunctional and portable underwater chemical oxygenator and its water purification effect |
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LI Yuan, YANG Na, WANG Chenyi, YU Jie, LI Ping, CHEN Zilin
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1. College of Biological & Environmental Sciences, Zhejiang Wanli University, Ningbo 315100, China
2. Ningbo Shengqian Environmental Technology Development Co. Ltd., Ningbo 315100, China
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| Abstract: |
| Background, aim, and scope Mechanical aeration has been widely used as a traditional aeration technology, but it has high energy consumption, high disturbance, affects water transportation and natural aesthetics, and has limited ability to add oxygen to the water. In order to improve the dissolved oxygen (DO) level in the underwater layer, this paper uses a self-designed portable underwater chemical oxygenator with denitrification and phosphorus removal to explore its optimal oxygenation conditions, and tests its water purification effect. Materials and methods The optimal oxygenation conditions were explored by orthogonal experiments, and the water quality of the underwater chemical oxygenator (device group), mechanical oxygen oxygenator (aeration group) and unaerated water (blank group) were compared for 18 days. Results The results showed that the device group was under the optimal conditions of 30% H2O2, 25 g Na2CO3, a placement depth of 60 cm, and 2.4 kg of mixed mineral material in the aerator. After 18 days of treatment, the DO was maintained at about 3 mg·L−1. The removal rates of total nitrogen (TN), total phosphorus (TP), NH4+-N and permanganate index in the tested water body were 55.86%, 71.45%, 61.70% and 82.04%, respectively. Discussion The water quality of the test water body was effectively improved, but the DO concentration of the device group was lower than that of the aeration group, which may be related to controlling the drop rate of liquid oxygenant under the optimal conditions to delay the release rate of DO, improve the oxygen utilization and reduce the disturbance damage to indigenous microorganisms. Conclusions The research results can give full play to the oxygenating effect of the underwater chemical oxygenator and provide a new technology and equipment for the restoration practice of black and odorous water bodies. Recommendations and perspectives In this paper, an underwater oxygenator was established to provide a new idea to increase the DO concentration in water and treat black and odorous water bodies. |
| Key words: underwater oxygenator chemical oxygenation mechanical aeration environmental minerals optimal oxygenation conditions nitrogen and phosphorus removal effect |
