A method for automatic regulation of the sludge trigger is composed of an arrangement for the treatment of water and apparatus for carrying out the method

摘要

Two samples of water are taken at two predetermined levels from a variable turbidity region disposed just below the sludge bed of a sewage treatment apparatus. The samples are alternately fed to a constant-level vessel whereat the turbidity variation between the samples is measured. The rate and duration of the sludge extraction operation are controlled as a function of such turbidity variation.