塘沽盐田生态系统化学元素的跟踪调查分析

Tracking Chemical Elements in Saltern Ecosystem in Tanggu

随着近年来海水淡化产业的发展,其副产物浓海水已成为日晒海盐主要原料来源.由于海水淡化过程中原有生态系统被彻底破坏,浓海水进入盐田后,其原有湿地生态系统受到较大程度的冲击.通过跟踪调查盐田生态修复前后化学元素的变化,研究盐田生态系统调控过程对卤水盐度、黏度、常规离子及氨氮、总磷元素的作用规律.结果表明:经过盐田生态系统调控后,卤水的盐度稍有提高,黏度有所下降.一方面,卤水中的氨氮、总磷元素含量的变化和盐藻的生长与衰亡有着密不可分的关系,符合盐田的良性生态循环,盐度在140~160时最适合盐藻生长.另一方面,卤水蒸发量增大,氯离子浓度较盐田生态修复前相比得到提高,进而有利于盐业生产,并且卤虫接种使卤水得以净化,防止藻类等浮游群落大量繁殖起来,避免卤水变黏,促使钙盐在盐度为130~140时提前析出,从而减少了卤水中的有机颗粒和无机颗粒,使盐的品质得到稳定和提高.

With the development of seawater desalination industry in recent years,the concentrated seawater,which is a byproduct of the seawater desalination,has become the main raw material for sun-dried sea salt.Due to the complete destruction of the original biological system in the process of desalination,the original wetland ecosystem suffered a lot after the concentrated seawater entered the saltern.This study investigated the changes of chemical elements before and after the ecological restoration of the saltern.The study of the effect of regulation on the salinity,viscosity,conventional ions,ammonia nitrogen and total phosphorus elements in the regulatory process of saltern ecosystem indicated that the salinity of the brine has increased and the viscosity has decreased after the regulation of the saltern ecosystem.The changes in the content of ammonia nitrogen and total phosphorus in brine are closely related to the growth and decline of algae,which is in line with the benign ecological cycle of the saltern.The most suitable salinity for the growth of alage ranges from 140 to 160.In addiction,evaporation of brine leads to chloride ion concentration increase,which is conducive to salt production.At the same time,artemia inoculation allows brine to be purified,prevents algal bloom and other phytoplankton communities from multiplying,avoids the brine becoming sticky,and thus promotes the precipitation of calcium salt when the salinity is 130 to 140.Accordingly,the organic and inorganic particles in the brines are reduced,and the quality of salt is stabilized and improved.