The invention discloses an adjusting tank and biochemical tank double-layer combined
water treatment device, and belongs to the technical field of
water treatment. The device comprises an adjusting tank and an equipment room which are positioned on the lower layer, a biochemical tank positioned on the upper layer, and
stairs for connecting all the
layers, the outer contour of the overhaul well arranged in the adjusting tank is completely located outside the
orthographic projection range of the bottom plate of the biochemical tank, an independent vertical overhaul channel is formed, and the problem that an upper tank body must be stopped during overhaul of lower-layer equipment of a traditional double-layer structure is solved; a plurality of water ejectors are arranged in the adjusting tank along the short edge direction to replace a submersible stirrer with a high
failure rate, and are matched with a flow guide structure to generate a spiral
upwelling flow state to form a cross
jet flow field covering the whole tank; the water outlet well of the biochemical
pool is provided with a three-stage drop weir to gradually attenuate the
kinetic energy of
water flow; the equipment room is integrally arranged on one side of the bottom of the biochemical
pool and is provided with an independent access; the
stairs start from the outdoor terrace, the middle platform communicates with the top of the overhaul well, and the top platform communicates with the top of the biochemical
pool to form a complete vertical
traffic system. The device integrates the three-dimensional space of the regulating tank and the biochemical tank, saves the occupied area, ensures reliable operation and convenient maintenance, and is suitable for the reconstruction
engineering construction of a
sewage treatment
plant with shortage of land.