Methods: seawater preparatorytreatment, high pressure reverse osmosis desalination and other techniques were used to produce fresh water from seawater.
方法：采用反渗透海水淡化技术，通过海水预处理、高压反渗透脱盐等程序，从海水中获取可饮用的淡水。
2
In this paper, the preparatorytreatment for determination of Cr6+ in ground water or industrial effluents by the method of spectrophotometry has been improved.
本文对二苯碳酰二肼分光光度法测定地表水及工业废水中六价铬的样品预处理方法提出了改进措施。
3
Before the disposal, make preparatorytreatment of the soil to ensure the water content, maximum particle diameter, pH value, clay content of the soil are suitable for the following disposal.