Then waste liquid goes to biological treatment plants in the form of the circular-oxidative channels (CSC)
w
orking by the principle of simultaneous removal of nitrogen and organic pollution [12, 13]. This method differs in
that process is carried out in one construction without separate allocation aerobic and the anoxic zones, and also
recirculation streams of sludge mix. CSC
construction works on the principle of variable aeration for the
effective combination of nitri - denitrification in the volume of one construction.