Efficient continuous type reverse-particle-size filter device and technology

Abstract

The invention discloses a continuous type reverse-particle-size filter technology. According to the continuous type reverse-particle-size filter technology, reverse-particle-size filtration is regarded as a core, filter cloth or filter screens with different bore diameters are preferentially selected as filter media and wrapped on columnar grids for filtration. Raw water, under the action of pressure, enters the columnar grids for the filtration through an outer barrel body and the filter media. In the working process, the filter media maintain a slow rotating state. When rotating to a back-flushing area, the filter media are back-flushed by filtered water from inside to outside. According to the continuous type reverse-particle-size filter technology, back-flush is conducted at the same time of the filtration, and continuous filtration is achieved; gaps of the filter media are bigger in the outer layer than in the inner layer, filtering velocity of reverse-particle-size filtration is high, and sludge content is large; a plurality of filter units such as raw water distribution, the filtration and the back-flush are integrated so that the integration level of main equipment is improved; and meanwhile, solid-liquid separation and sludge concentration are achieved in the main equipment with no need of additional arrangements of other equipment and devices, and therefore the automation level of the main equipment is high, the application range is wide, the investment of capital construction and running cost are low, the occupied area is small, and operation is simple.

Description

technical field [0001] The invention relates to a water purification device, which is used for filtering and separating suspended solids in water, in particular to a water purification process with fiber filter medium anti-particle size filtration as the core to achieve efficient and stable purification effect, which can be widely used in surface water, municipal sewage, industrial Wastewater purification treatment and sludge concentration. Background technique [0002] Traditional filtration methods mostly use downflow filtration, that is, water flows through the filter bed from top to bottom. This kind of filtering method has the following defects: First, because the particle size distribution of the filter material in the traditional filter layer presents the characteristics of small upper part and larger lower part, the raw water impurities are firstly intercepted by the small particle size filter material on the surface layer, while the large particle size filter materi...

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Problems solved by technology

This kind of filtering method has the following defects: First, because the particle size distribution of the filter material in the traditional filter layer presents the characteristics of small upper part and larger lower part, the raw water impurities are firstly intercepted by the small particle size filter material on the surface layer, while the large particle size filter material at the bottom layer is easily trapped by the small particle size filter material. Particle impurities penetrate, and the interception ability of the filter bed cannot be fully exerted, which makes the filtration period short, the filtration rate low, and the backwash difficult; pool treatment load, while increasing the operating cost; thirdly, the solid content of backwash wastewater is low, which increases the cost of water production

[0007] To sum up, for the filter layer filtration process, so far there is no one that can not only achieve a satisfactory treatment effect, but also maintain a long working cycle, and has a high filtration rate, a simple process, a small footprint, convenient operation and low cost. Approach

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