| Abstract: | Summary At Fuglebjerg, County of Soroe, South Zeeland (about 1000 inhabitants) a sewage treatment plant, consisting of three lagoons
in series, has been installed in an empty gravel pit. The plant has been in use since May 1952 and has produced a most satisfactory
effluent. Two times a year, chemical, bacteriological, and biological examinations have been performed, besides occasional
more restricted investigations. The bacteriological examinations have chiefly taken into consideration, the reduction in counts
of faecal bacteria, of whichE. coli is diminished considerably,Str. faecalis, and especiallyCl. welchii much less. The special value of the two last mentioned organisms as indicators of the efficiency of purification and the
condition in the receiving streams is stressed. As regards the change in microflora in the course of treatment, a variation
takes place from polysaprobic micro-communities characterized bybacteria andflagellates via α-mesosaprobic zones (flagellates andblue-green algae) to β-mesosaprobic conditions dominated bydiatoms. |
