ON THE STABILITY OF ACTIVATED-SLUDGE FLOCS WITH IMPLICATIONS TO DEWATERING

被引:244
作者
BRUUS, JH
NIELSEN, PH
KEIDING, K
机构
[1] Environmental Engineering Laboratory, University of Aalborg, DK-9000 Aalborg
关键词
ACTIVATED SLUDGE; ION EXCHANGE; EXOPOLYMERS; DEWATERABILITY;
D O I
10.1016/0043-1354(92)90159-2
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
It was shown thal Ca2+ can be extracted from activated sludge from a plant with biological nitrogen and phosphorus removal either by an ion exchange process, where H+, Na+, K+ or Mg2+ served as counter ions, or by chelation by EGTA. The extraction of Ca2+ led to an increase in the number of small particles and subsequently an increase in the specific resistance to filtration. It was argued that approx. half of the total Ca2+ pool was associated with the exopolymers and thereby formed an alginate-like gel, which constituted the backbone of the floc structure This notion was further emphasized by the observation that addition of Cu2+ which, along with releasing Ca2+, improved the dewaterability-probably because of the Cu2+ ions ability to maintain the three-dimensional structure of the exopolymers.
引用
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页码:1597 / 1604
页数:8
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