工业废水悬浮固体颗粒物污染下河道生态修复研究

悬浮固体颗粒物会导致水体浑浊度提高,降低水质透明度,阻碍水生生物的光合作用和觅食行为,对生态系统造成严重破坏。为了改善水质和恢复河道生态系统的健康状况,故提出工业废水悬浮固体颗粒物污染下河道生态修复方法。首先,介绍了研究区域、样本采集方法和研究方法;其次,设计了由膜分离设备、水生植物浮岛板、曝气复氧、循环泵四部分组成河道生态修复总线路,并通过对照区与生态修复区河道内悬浮固体颗粒物浓度含量对比,和悬浮固体颗粒物去除率、化学需氧量去除率、溶解氧含量三个指标展开河道生态修复效果分析。结果表明,该方法能够有效实现河道生态的修复。最后,提出了面对工业废水悬浮固体颗粒物污染下的河道生态修复建议。

Mechanism of Off-Bottom Suspension of Solid Particles in a Mechanical Stirred Tank

The minimum fluid velocity to maintain particles just suspendedwas deduced, and the theoretical analysis shows that the minimumvelocity is influenced by the properties of the solid and liquid, notby the operational conditions. For justification, the local minimumvelocity at the bottom of the tank was measured by a bi- electrodeconductivity probe, in a square-sectioned stirred tank (0.75m×0.75×1.0m) with the glass beads-water system. The experiments showed thatthe fluid velocities for the same suspension state were identicaldespite that the power Dissipated per unite mass was not the sameunder different configuration and operation. Both theoreticalanalysis And experimental results indicate that the off-bottomsuspension is controlled by the local fluid flow over the bottom Ofthe stirred tank.

水处理剂PCS应用条件的研究

水处理剂PCS是聚合氯化铝(PAC)与壳聚糖经科学的配伍形成的。本文通过试验探讨了PCS在造纸、化纤纺织、印染等领域中废水的处理技术,实验与应用结果显示:PCS对高浊度、高色度的原水都可以达到很好的混凝效果,矾花形成颗粒大,沉淀速度快。使用的条件:pH值为5～9;加药量以200～300mg·mL-1为宜;出水时CODCr在300mg·mL-1以下;SS在100mg·mL-1以下。