冬季净化湖水的效果与机理

Effects and mechanism on purifying lake warer quality in winter

为了做到全年改善饮用水水质，需要研究在冬季怎样有效净化水质的问题为此，在太湖重富营养化水域进行了人工生态系统工程改进试验．结果表明，采用若干措施后，能大大地改善水质；滞留时间<２ｄ时，工程内净化效果不明显；滞留时间延至７ｄ左右时，水质指标能改善５０％－８０％；工程内水质净化的机理为高等水生植物及其共生细菌的共同作用，使人工生态系统工程成为抵抗环境变化的稳定生态系统，使水质变化处于良性循环；而滞留时间<２ｄ或在人工生态系统工程外。

For improving drinking water quality in the whole year, it must be studied how to purify efficiently waterquality in winter. In order to raise effects on purifying water quality of the engineering in winter, some improved tests hadbeen taken. Results in the engineering in winter showed as follows. Lake water quality could be improved remarkably bysome methods, Effects on purifying water quality were un-notable when the remain time was not more than 2 days;however,the water quality could be improved 50%-80% when the remain time was prolonged about 7 days; mechanismon purifying lake water quality is that the cooperative actions of aquatic plants and their symbiotic bacteria made theengineering a stable artificial ecosystem with strong ability to resist the change of environment in the engineering, causinggood circle of the water quality change in the artificial ecosystem. However, outside the engineering or with the remaintime not more than 2 days in the engineering, the water quality changes in vicious circle.