包气带中污染物的天然降解作用

通过包气带造纸污水中的降解试验,分析了污染物在包气带内经吸附、过滤、离子交换以及生物化学作用等净化机制,指出生物氧化作用和生物还原作用是包气带中两种主要的生物化学作用.污染物在包气带中迁移时,会在表层形成生物氧化带,在下部形成生物还原带.只有当生物还原带形成后,生化层才发育成熟,包气带对有机物能进行有效地降解和清除,具有良好的天然降解功能.并指出包气带的岩性、结构和包气带的厚度是影响包气带的降解能力重要因素.

Natural Degradation of Contaminants in Unsaturated Zone

In this paper, through the degradation experiment of the paper mill wastewater, the degradation mechanism in the unsaturated zone is discussed , including adsorption , filtration , ion exchange and biodegradation. As pollutants are migrated in the unsaturated zone, biologic oxidation zone is produced in the upper part and biologic reduction zone is developed in the underside. After biologic reduction zone is developed and biochemical layer is produced fully, organic contaminants can be naturally biodegraded effectively. It is presented that lithology, structure and thickness are important effect factors in assessing the removal ability in the unsaturated zone.