chemical oxygen demand

简明释义

化学需氧量

英英释义

例句

1.A high chemical oxygen demand 化学需氧量 indicates that a water body is polluted and requires treatment.

高化学需氧量 化学需氧量表示水体受到污染，需要处理。

2.Monitoring the chemical oxygen demand 化学需氧量 helps in evaluating the effectiveness of wastewater treatment processes.

监测化学需氧量 化学需氧量有助于评估污水处理过程的有效性。

3.In a laboratory, we can measure the chemical oxygen demand 化学需氧量 using standardized tests.

在实验室中，我们可以使用标准化测试来测量化学需氧量 化学需氧量。

4.Regulatory agencies often set limits on the chemical oxygen demand 化学需氧量 in effluent discharges.

监管机构通常会对排放中的化学需氧量 化学需氧量设定限制。

5.The wastewater treatment plant regularly tests the chemical oxygen demand 化学需氧量 of incoming water to assess its pollution level.

污水处理厂定期测试进水的化学需氧量 化学需氧量以评估其污染水平。

作文

Understanding the concept of chemical oxygen demand is crucial for anyone involved in environmental science and water quality management. Chemical oxygen demand (COD) refers to the amount of oxygen that is required to chemically oxidize organic compounds in water. This measurement is essential because it provides an indication of the level of pollution in water bodies, particularly from industrial discharges and sewage. In essence, a high chemical oxygen demand signifies that there are substantial amounts of organic matter present, which can lead to detrimental effects on aquatic life and overall ecosystem health.The process of measuring chemical oxygen demand involves taking a water sample and adding a strong oxidizing agent, typically potassium dichromate, in an acidic solution. The sample is then heated for a specified duration, allowing the oxidizing agent to react with the organic material present. After the reaction, the remaining unreacted oxidizing agent is quantified, and the amount of oxygen consumed during the reaction is calculated. This value is expressed in milligrams per liter (mg/L).The significance of monitoring chemical oxygen demand cannot be overstated. For instance, in wastewater treatment facilities, understanding the COD levels helps operators determine the effectiveness of their treatment processes. If the COD levels remain high, it may indicate that the treatment system is not adequately breaking down the organic materials, necessitating adjustments or improvements.In addition to wastewater treatment, chemical oxygen demand is also vital in assessing the health of natural water bodies. Rivers, lakes, and streams with high COD levels can experience oxygen depletion, which harms fish and other aquatic organisms that rely on dissolved oxygen for survival. Therefore, regulatory agencies often set permissible limits for COD in effluent discharges to protect water quality.Moreover, the implications of chemical oxygen demand extend beyond just aquatic ecosystems. High levels of COD can also impact human health, especially when polluted water sources are used for drinking or recreational purposes. Contaminated water can lead to various health issues, including gastrointestinal diseases and other infections.In conclusion, a thorough understanding of chemical oxygen demand is essential for environmental professionals and policymakers alike. By monitoring and managing COD levels in water bodies, we can protect aquatic life, ensure safe drinking water, and maintain the overall health of our ecosystems. As we continue to face environmental challenges, the importance of tools like chemical oxygen demand testing will only grow, emphasizing the need for ongoing education and awareness in this critical area of study.

理解化学需氧量的概念对于任何参与环境科学和水质管理的人来说都是至关重要的。化学需氧量（COD）是指在水中化学氧化有机化合物所需的氧气量。这个测量非常重要，因为它提供了水体污染水平的指示，特别是来自工业排放和污水的污染。本质上，高化学需氧量意味着存在大量有机物，这可能对水生生物和整体生态系统健康产生不利影响。测量化学需氧量的过程包括取一个水样，并在酸性溶液中加入一种强氧化剂，通常是重铬酸钾。然后将样品加热一段时间，使氧化剂与存在的有机物反应。反应后，未反应的氧化剂被定量，计算出反应过程中消耗的氧气量。这个值以每升毫克（mg/L）表示。监测化学需氧量的重要性不容小觑。例如，在废水处理设施中，了解COD水平有助于操作员确定其处理过程的有效性。如果COD水平保持较高，这可能表明处理系统未能充分分解有机材料，需要进行调整或改进。除了废水处理，化学需氧量在评估自然水体的健康状况方面也至关重要。COD水平高的河流、湖泊和溪流可能会经历氧气耗竭，这对依赖溶解氧生存的鱼类和其他水生生物造成伤害。因此，监管机构通常会设定排放的COD允许限值，以保护水质。此外，化学需氧量的影响不仅限于水生生态系统。高COD水平还可能影响人类健康，特别是当受污染的水源用于饮用或娱乐时。污染水源可能导致各种健康问题，包括肠胃疾病和其他感染。总之，全面理解化学需氧量对于环境专业人员和政策制定者来说都是至关重要的。通过监测和管理水体中的COD水平，我们可以保护水生生物，确保安全饮用水，并维持我们生态系统的整体健康。随着我们继续面临环境挑战，像化学需氧量测试这样的工具的重要性只会增加，强调了在这一关键研究领域持续教育和意识提升的必要性。