混凝剂对污泥膨胀影响的实验研究

利用一体式膜生物实验反应器,通过静态和动态实验,并结合考察化学需氧量（COD）和氨氮（NH4＋-N）等参数,先后研究了在不同pH值条件下,硫酸铝、氯化铁和改性淀粉混凝剂及助凝剂PAM等物质对污泥膨胀的控制效果.结果表明,在静态条件下,氯化铁对污泥膨胀的控制效果最好,氯化铁的质量浓度达到120 mg·L^-1之后,活性污泥的沉降比SV（Settling Velocity）可以稳定在91%左右。动态实验表明,投加混合药剂使出水中NH4＋-N的质量浓度可由平均11.09 mg·L^-1下降至1.77 mg·L^-1,出水中COD由平均18.14 mg·L^-1下降至14.4 mg·L^-1.研究表明,通过添加混凝剂可以控制污泥膨胀的发生,并可以提高污水处理效率.

Study on effect influence of coagulant on filamentous sludge bulking

It studies on the effect of coagulants that are aluminum sulfate,ferric chloride,modified starch and PAM on controlling filamentous sludge bulking in the integrated membrane biological reactor with the static and dynamic method and parameters of COD and NH＋4-N.As a result,the ferric chloride works most effectively among the coagulants because SV%（Settling Velocity） can be stablized at the level of 91% when mass concentration of ferric chloride reaches 120 mg·L^-1 in the static experiment.In dynamic experiment,the outflow of average mass concentration of NH＋4-N drops from 11.09 mg·L^-1 to 1.77 mg·L^-1 and that of COD drops from 18.14 mg·L^-1 to 14.4 mg·L^-1,by using PAM-ferric chloride coagulant.Therefore,it shows that coagulant can control filamentous sludge bulking in the integrated membrane biological reactor and enhance the efficiency on wastewater treatment.