sludge

• Sludge liquor is recirculated in the secondary system .
  污泥水回流到二级处理系统。
• Most of the cellulose will settle to produce a sludge .
  大部分纤维素沉淀生成污泥。
• Less than 0. 3% of u.s. croplands receive sludge .
  03弱的美国农地上施用了污泥。
• Sludge incineration is a frequently employed disposed method .
  污泥焚烧也是一种常用的处置方法。
• Sludges forming in the acid interfere with storage and handling .
  在酸中形成淤渣，妨碍贮存和运输。
• Over 300 strains of bacteria have been found in activated sludge .
  活性污泥中发现有300种以上的细菌。
• Thickening is the usual first step in sludge disposal processing .
  污泥处置过程中，浓缩通常是第一道工序。
• Typically these sludges settle rapidly but do not compact very well .
  这些污泥一般沉降迅速，但并不很紧密。
• Fluid sludge can be sold to farmers for spreading on their fields .
  液态污泥可以出售给农民，洒布在农田里。
• Better methods of dewatering and disposing of these sludges are needed .
  需要研究更好的污泥脱水和处置方法。