偏铝酸钠去除高盐废水中二氧化硅的试验研究

研究了偏铝酸钠的投加比、pH对二氧化硅去除效果的影响,同时考察了偏铝酸钠除硅时对Ca^2+、Mg^2+的去除效果。研究表明,当pH控制在8.5时对二氧化硅的去除效果最佳,同时偏铝酸钠与二氧化硅的投加质量比在2∶1时即可将废水中的二氧化硅降至5 mg/L以下,去除率达到95%以上。除硅后产水中残留铝离子仅有0.47 mg/L,不会造成铝离子含量的明显上升;在偏铝酸钠除硅过程中对钙离子几乎没有去除作用,而对镁离子有15%的去除率。

Application of High-pressure Flat Membranes in Coal Chemical Wastewater Treatment

In the process of using high-pressure flat membranes to treat coal chemical wastewater,the effects of high-pressure flat membranes on the concentration of salt ions and the removal of pollutants were studied under the conditions of different concentrations of influent TDS,COD and silicon dioxide.The results showed that when the concentration of influent TDS was 35 000-55 000 mg/L,the economic benefit of high-pressure flat membrane operation was the best,and the concentration ratio of high-pressure flat membranes was stable,varying from 3.3 to 3.6.As the concentration of influent organic matter ranged from 100 to 1 800 mg/L,the removal rate of organic matter ranged from 60% to 79%.In addition,the retention rate of high-pressure flat membranes to silicon dioxide was more than 90%.