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THE EFFECT OF LARVAE OF CHIRONOMUS RIPARIUS MEIGEN ON THE REDOX POTENTIALS OF SETTLED ACTIVATED SLUDGE
Author(s) -
EDWARDS R. W.
Publication year - 1958
Publication title -
annals of applied biology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.677
H-Index - 80
eISSN - 1744-7348
pISSN - 0003-4746
DOI - 10.1111/j.1744-7348.1958.tb02226.x
Subject(s) - chironomus riparius , chironomus , activated sludge , redox , biology , environmental chemistry , larva , ammonia , nitrogen , chironomidae , botany , sewage treatment , environmental engineering , chemistry , biochemistry , inorganic chemistry , organic chemistry , engineering
The introduction of Chironomus riparius larvae to give densities of 12,500 and 50,000/m 2 in activated sludge, previously settled and consolidated for 6 months, had the following effects: (a)a rise in pH initially at the sludge surface but later extending to all depths, (b)an increase in the depth of the surface layer of sludge where the redox potential is high, (c)increases in the pH value and concentration of ammonia and a decrease in the concentration of oxidized nitrogen in the overlying water.