海水淡化厂外排浓盐水输移扩散数值模拟预测

Numerical Simulation of Transport and Diffusion of Brine Discharged from Desalination Plant

为研究海水淡化厂外排浓盐水对周边环境产生的影响,利用数值模拟方法对浓盐水进入水体(循环渠)的盐度进行了模拟预测并提出相应的改善措施。模拟结果显示:现状工况下盐度最大值出现在相对蒸发量较大而循环渠取水量较小的4月份;海水淡化厂开始运营后,若其浓盐水全部排入循环渠,循环渠中的盐度将会显著增加,盐度最大值出现在取水量最小的3月份;提高取水量可以有效降低循环渠内的盐度值,并使之满足排放要求。

To study the environmental impact of brine discharged from a desalination plant, the salinity of brine discharged in the loop-channel was predicted using numerical simulation, and improvement measures were proposed. The results show that in the actual case, the maximum salinity occurs in April when the relative evaporation is high, and the volume of pumped water from the loop-channel is small. When all brine is discharged in the loop-channel during the operation of desalination plant, a sharp rise in salinity will be observed. The maximum salinity occurs in March when the volume of pumped water is lowest in a year. The salinity demand is met by raising the pumped volume.