Fixed bed filtering unit and water treatment device

Abstract

The invention discloses a fixed bed filtering unit and a water treatment device, and relates to the technical field of fixed bed filtering. The fixed bed filtering unit comprises a filtering medium particle fixed bed layer, a support layer and a turbulence promoting layer, wherein the filtering medium particle fixed bed layer is used for filtering solid or gas in fluid; the fixed bed layer is fixedly arranged on the support layer; the turbulence promoting layer is covered at the surface of the fixed bed layer, and is in contact with filtering medium particles for filtering the solid or gas inthe fluid. The water treatment device comprises the fixed bed filtering unit and a membrane separating unit which is serially communicated with the fixed bed filtering unit. The water treatment devicehas the advantages that the mass transfer speed and the transfer and diffusion speeds are quick; the anti-pollution ability is strong; the positive flushing and back flushing effects are good, and the like.

Description

technical field [0001] The invention relates to the technical field of fixed bed filtration, in particular to a fixed bed filtration unit and a water treatment device. Background technique [0002] Usually, the shape of the filter media in fixed bed sand filter, fixed bed electrochemical reactor and fixed bed gas purification device is particles, and the filter media particles in the fixed bed layer are in a state of natural accumulation, and some filter media particles in the fixed bed layer have Three translational degrees of freedom are obviously restricted by the critical fluidization velocity of the fluid. The filter medium particles selected for the fixed bed layer are relatively coarse, the ability to intercept suspended solids is not strong, and the adsorption speed or ion exchange speed or electrochemical reaction speed is slow. For example, when copper-zinc alloy in fixed-bed electrochemical water treatment removes residual chlorine in water, copper-zinc alloy part...

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Problems solved by technology

[0002] Usually, the shape of the filter medium in the fixed bed sand filter, fixed bed electrochemical reactor and fixed bed gas purification device is granular, and the filter medium particles in the fixed bed are in a natural accumulation state, and some filter medium particles in the fixed bed have 3 translational degrees of freedom, obviously restricted by the critical fluidization velocity of the fluid, the filter medium particles selected for the fixed bed layer are relatively coarse, the ability to intercept suspended solids is not strong, and the adsorption speed or ion exchange speed or electrochemical reaction speed is slow

For example, when copper-zinc alloy in fixed-bed electrochemical water treatment removes residual chlorine in water, copper-zinc alloy particles of 10-60 mesh are generally used, and the water flow rate is generally not higher than 0.5cm / s. And the diffusion speed is slow, the liquid channel is easy to block, and the backwashing frequency is high. At the same time, the copper-zinc alloy fixed bed is large in volume, and the amount of copper-zinc alloy used to build the fixed bed at one time is large and the cost is high.

Copper-zinc alloy fixed-bed electrochemical reactors are usually combined with water treatment processes such as membrane water treatment, activated carbon, and ion exchange. Different water treatment media are set in different shells, and the number of shells used is large, large, and High manufacturing cost and many water leakage points bring inconvenience to installation, use and maintenance

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