J. Franta et al., EFFECTS OF OPERATION CONDITIONS ON ADVANCED COD REMOVAL IN ACTIVATED-SLUDGE SYSTEMS, Water science and technology, 29(7), 1994, pp. 189-192
Citations number
2
Categorie Soggetti
Water Resources","Environmental Sciences","Engineering, Civil
Sequencing Batch Reactor (SBR) experiments have been conducted to stud
y factors affecting composition and concentration of residual organics
in the effluent of biological wastewater treatment plants. Wastewater
discharged by a papermill was used as a reference. First results indi
cate that sludge age plays an important role when industrial wastewate
rs are to be treated. Increase of the sludge age led to elimination of
key halogenated compounds in the effluent, although the effluent COD
often remained hardly changed. Of importance is also the duration of t
he starvation period during each cycle. To maintain high substrate rem
oval efficiency it is necessary to extend the duration of the aeration
phase until the enzyme activity has been reduced to the background le
vel. It was observed that the enzyme activity remains high even when t
he respiration rate had reached the level of endogenous respiration. H
igh treatment efficiency can only be maintained if the bacteria are su
pplied with feed, and then exposed to starvation conditions on a perio
dic basis.