热电厂废水在库布其沙地农业利用的生态效应分析

采用野外现场生态调查、实验室分析和现场模拟相结合的方法,研究了电厂废水农业利用可能带来的环境问题。结果表明,以目前达拉特电厂的水质状况,在库布其沙地进行合理的农业利用,在可以预见的时间内(20a),不会导致土壤盐渍化和重金属污染现象的发生,因此,电厂废水的农业利用是可行的。

Analysis on Ecological Effects of Wastewater Utilized as Irrigation from Power-Plant in Kubuqi Sandy Land

Natural condition of Kubuqi sandlot is only suitable to grow several kinds of drought-tolerant and leanness-tolerant pioneer plants,such as Agriophyllum arenarium, Artemisia intramongolica, Psammochloa uillosa etc, characterized by growing slowly, little biomass and low economical value as forage and medicinal materials. An industrialization demonstrating project of National Planning Committee-rapidly constructing vegetation in Kubuqi sandlot-has been performed for two years. However, scarcity of water and fertility in the sandy land severely restricts sustaining implementation of rapid construction vegetation and industrialization. Therefore, an experimental demonstration research on harmlessness, resource, and integrated utilization of wastewater from power-station near Kubuqi sandlot in Dalate is needed urgently.By method of field investigation, laboratory analysis and spot simulation, the potentialenvironmental problems caused by wastewater application as irrigation water from power-station were evaluated. It is revealed that the wastewater from power-station in Dalate, Inner Mongolia can be safely utilized as irrigation water, according to its water quality at present. It is concluded that in predictable period (20 years), eco-environmental problems such as soil salinization and heavy metal pollution will not occur. Therefore, wastewater utilization as irrigation from power-station is feasible in Kubuqi sandlot. Moreover, the main factor of restricting rapid vegetation restoration of Kubuqi sandlot is in scarceness of water. The wastewater application as irrigation from power-station in Dalate can not only relieve the problems of the scarce of water in the land fertility, and speeds vegetation restoration, but also solves the problems of discharge and storage of wastewater in power-station and decreases contamination of water in Huang River .