A sedimentation sludge reflux coagulation aid and coagulation nucleation clarification device

Abstract

A settling sludge return coagulation aiding and coagulation clarification device, including a water inlet and outlet unit, a chemical dosing and mixing unit, and a coagulation and sedimentation unit, wherein the coagulation and sedimentation unit includes a shell connected to the water outlet of the raw water tank, and the shell is composed of the same The outer cylinder of the shaft, the middle cylinder and the inner cylinder are composed of three layers of cylinders. The mixing zone, the coagulation zone, the flocculation zone and the sedimentation zone are formed in the shell. The area is connected to the return sludge pipe, and the sludge outlet pipe and the return sludge pipe are connected to the remaining sludge pipe outside the shell. The flocculated particles settle in the sedimentation area by gravity. The sludge is fully mixed. In the coagulation zone, the coagulation reaction occurs with the return sludge particles as the coagulation core. In the flocculation zone, the nucleation of the return sludge particles is used to promote the floc growth and granulation. It has the characteristics of small amount, low floor space, good effluent quality, high sludge return concentration, small return flow and easy control.

Description

technical field [0001] The invention belongs to the technical field of water treatment, and relates to the removal of suspended matter in water supply, domestic sewage and industrial waste water, in particular to a settling sludge backflow coagulation aiding and condensation nucleation clarification device. Background technique [0002] The clarification process of raw water is a complex physical and chemical process, usually including coagulation, flocculation and sedimentation processes. The coagulation mechanism mainly includes the ZTA potential theory, and the precipitation process is mainly based on the compression precipitation theory. [0003] The coagulation process requires the hydrolyzate of the coagulant to diffuse rapidly into the water, and all colloidal particles destabilize and coagulate almost at the same instant, so as to obtain a good flocculation effect. In order to achieve a good flocculation effect, a pipeline mixer is usually used in the treatment to f...

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Problems solved by technology

[0006] Invention patent CN 102078708 B discloses a solid-liquid separator that relies on hydrocyclone to granulate and grow suspended matter in water to achieve solid-liquid separation. The processing technology of this equipment is too complicated and it is inconvenient to manufacture and install

This process is aimed at urban water supply treatment. The coagulation tank, filling tank, flocculation tank and high-efficiency sedimentation tank are arranged in series. It requires special fine sand dosing equipment and sand-water separation equipment. The process is long and the cost of equipment is high, and the cost of fine sand raw materials is high.

[0009] Generally speaking, the volume of the coagulation tank and sedimentation tank in the existing clarification devices is often too large, the space utilization rate is not high, the flocs are loose, the design hydraulic retention time is greater than the actual hydraulic retention time, and the effect is poor

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