地热水对环境影响及污染防治(二)

THE ENVIRONMENTAL INFLUENCE OF GEOTHERMAL WATER AND POLLUTION CONTROL

针对我国广大农村地热区地热尾水直接排放所引起的污染特点，介绍利用水生植物系统净化地热尾水，以降低其中有害成分（主要是氟、砷等）的含量。试验结果表明，这是一种经济有效、适合我国国情的方法。在试验条件下，用石灰沉淀法预处理后的地热尾水，再经水生植物系统进一步净化，出水完全达到农田灌溉水质标准。还对净化系统的设计和运行参数及水生植物的综合利用等问题进行了探讨和研究，提出了利用水生植物系统净化地热尾水工艺流程。

In this paper, 48 geothermal water wells had been surveyed,the formation cause of geothermal water and their characteristics were analyzed. According to results of the field tests,the potential hazards and the effects of exploration and utilization of geothermal water on soil surface water,underground water,acquiculture and crops werediscussed. The varying patten of the pollution was summarized. The conclusion was that,when exploration of geothermal water environmental pollution control must be taken into account simultaneously.