settling separation

The sludge treatment of Minhang Water Works which used Huangpu River water as source was studied. Through sludge settling characteristics study, a process which consisted of collection, thickening, equalization, PAM dosing, solid liquid separation by centrifuge, PLC central control was adopted.

针对黄浦江水系闵行水厂排泥水的处理，通过污泥沉降特性研究，采用收集、浓缩、平衡、投加聚丙烯酰胺（PAM）、离心机固液分离的工艺流程和PLC中央控制，提高了自动化程度。

The authors set forth the method which adopted dry filtering method to measure the zinc content in zinc sulphide concentrate and by comparison, it is considered that this method for measuring zinc content in zinc concentrate is faster and preciser than twice settling separation method.

作者阐述了用干过滤法测定硫化锌精矿中锌的含量的方法与步骤，通过对比，认为采用该法测定锌精矿中锌的含量较两次沉淀分离法要快捷、准确。