High-efficiency hydraulic air dissolving device used for dissolved air flotation

Abstract

A high-efficiency hydraulic air dissolving device used for dissolved air flotation comprises a reflux pressure pump, a dissolved air tank, a hydraulic air mixer and a compressed air inlet control valve; a reflux pipe on an air floatation tank or air floatation column water outlet pipe is connected to an air dissolved water inlet of the dissolved air tank through the reflux pressure pump, and the dissolved air tank is connected with the inlet of the hydraulic air mixer arranged at the top part in the dissolved air tank; a pipe orifice connected with the compressed air inlet control valve through a compressed air pipeline is also formed in the top part of the dissolved air tank; the hydraulic air mixer is provided with a jet nozzle for jetting generated high-velocity water flow to a mixing throat pipe below; an air inlet used for sucking compressed air of the upper part of the dissolved air tank and communicating with the outside is formed in the junction of the jet nozzle and the throat pipe; the lower section of the throat pipe is a diffuser; a water knockout vessel is arranged below the diffuser; an exhaust port for exhausting dissolved water flow flowing downwards from the bottom part is formed in the dissolved air tank; and the exhaust port is connected to a dissolved air release device through the water outlet pipe. The high-efficiency hydraulic air dissolving device disclosed by the invention is low in power consumption, high in air dissolving efficiency and adjustable in reflux ratio, has simple air dissolving mode, and is automatically controlled in operation.

Description

technical field [0001] The invention relates to the field of environmental protection water treatment, in particular to a high-efficiency hydraulic air-dissolving device for dissolved air flotation. Background technique [0002] The air flotation process is widely used in sewage treatment. It can be used as a pretreatment device in the water treatment system to remove oily substances, suspended solids, colloids, and even algae substances in the water by air flotation, and it can also be used for water treatment. In other places during the treatment process, suspended solids in water are removed to ensure the stable operation of subsequent equipment or processes, and it can also be used in papermaking and mineral processing industries to recover valuable substances. Its principle is to use air bubbles to adhere to pollutants to produce a specific gravity difference with water, and under the action of buoyancy, a separation technology that physically separates water from pollu...

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Problems solved by technology

[0003] At present, the most widely used method is partial dissolved air flotation (DAF), but the following problems generally exist: 1) The reflux flow rate is too large, generally between 25% and 50%, and the energy consumption of the reflux booster pump is relatively high ; 2) The utilization rate of compressed air is low, that is, the dissolution efficiency of air is low, and the consumption of compressed air is large; 3) Undissolved air is entrained in the effluent of the dissolved air tank, and they directly enter the air flotation tank, which is easy to damage the separation effect of the air flotation tank. The effluent water quality fluctuates greatly

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