Efficient hydraulic circulation clarifier

Abstract

The invention discloses an efficient hydraulic circulation clarifier and aims to provide a circulation clarifier which is high in operation stability, reduces chemical and energy consumption, can better adapt to changes of water volume and water quality during actual operation and reduces operation cost of water treatment facilities. The efficient hydraulic circulation clarifier adopts a method implemented according to the following steps: firstly, raw water enters a water inlet pipe at the clarifier bottom, is sprayed into a Venturi tube at a high speed through a spray nozzle and a horn mouth, so that vacuum is formed near the horn mouth in the lower part of the Venturi tube and sucks a large amount of backflow sludge, the backflow sludge and the raw water mix and react fiercely in the Venturi tube, and then a product enters a first flocculation basin and a second flocculation basin; a sludge and raw material mixed solution overflowing from the second flocculation basin is subjected to sludge-water separation in a separation chamber in a settling region, clear water moves upwards and is collected by a water collection tank and drained outward, one part of the settled sludge enters an automatic sludge discharge pipe, and the other part of the settle sludge is sucked by the Venturi tube, enters a reaction system and is recycled continuously.

Description

technical field [0001] The invention relates to a circulation type clarifier for treating sewage sludge, in particular to a high-efficiency hydraulic circulation clarifier. Background technique [0002] The clarifier is a water treatment structure that integrates coagulation and sedimentation. It is mainly used for water supply treatment and also for waste water; as a form of sludge circulation clarifier, the hydraulic circulation clarifier can simultaneously realize coagulant and raw water There are three processes of mixing, reaction and floc precipitation separation; when the raw water (after adding coagulant) after the water pump is lifted passes through the nozzle at high speed, a negative pressure will be formed around the nozzle and throat of the water ejector, so that the surrounding A large amount of backflow sludge is sucked into the throat and fully mixed with the raw water. The full contact and coagulation reaction between the raw water and the backflow sludge st...

AI Technical Summary

Problems solved by technology

[0003] The traditional hydraulic circulation clarifier has the advantages of simple structure, no mechanical mixer and other equipment, simple and convenient construction and maintenance, etc. However, it also has disadvantages such as large energy consumption and poor adaptability. If it is carried out on the basis of traditional hydraulic circulation tank Some transformations can solve some of its shortcomings to a certain extent, give full play to its advantages, and achieve better treatment effects; the traditional hydraulic circulation clarifier has the following shortcomings: (1) The water production capacity is small, and it is suitable for water volume and water quality. Poor ability to change: The design parameters of each part of the hydraulic circulation clarifier are designed under the required design flow rate, controlling a little flow rate, reaction time and other parameters, and the coagulation and sedimentation effect brought about by the change of water volume and water quality can be reached. It does not meet the design requirements; for example, when the water volume decreases, the flow velocity at the nozzle decreases, and the amount of reflux sludge decreases, which will lead to poor coagulation reaction effect and affect the water quality of the effluent, while the increase of the flow rate will bring turbulence to the reaction water flow. The flocs formed are easily broken, and the increase in the flow rate in the sedimentation area will also cause problems such as mud turning and mud running, making the water outlet situation worse, which also limits the improvement of water production capacity; The discharge is difficult to control: the sludge discharge of the hydraulic circulation clarifier is controlled manually on a regular basis

However, due to the influence of human factors, there are many sludge control links, often resulting in insufficient circulating sludge, or excess old sludge, resulting in problems such as effluent mud running; (3) Uneven load on the effluent surface, resulting in water discharge Unstable effect: Due to the layout of the circular pool radial flow collection tank, the surface load of the pool body is uneven in the erection direction. After measurement, the pool area near the center of the pool body is 1 / 3, and the water collection outflow load is as high as The total effluent load is 2 / 3, and the pool area of ​​the remaining 2 / 3 area is only 1 / 3. The uneven surface load limits the increase of water production.

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