Sludge interception tank and control mode thereof

The invention relates to the field of water treatment, in particular to a sludge interception tank of a sludge water adjusting tank of a sedimentation tank of a water purification plant and a control mode thereof. According to the invention, a layer of sludge storage tank is superposed on an original common sedimentation tank sludge water regulating tank, and a bidirectional bottom sludge scraper is arranged in the regulating tank, so that in a high-turbidity period, sandy easily-settled sludge is scraped into a sludge collection pit, and the sludge is lifted to the superposed sludge storage tank; the water on the surface layer of the storage pool is skimmed out and flows back to the lower layer through the water decanter, and the sludge is cleaned and transported outwards after being air-dried, so that the effect of reducing the peak value of the sludge amount is achieved, the sandy easily-blocked sludge can be intercepted and separated, the scale of a sludge treatment system is fully saved, and the service