Novel water collection and backwashing sand filter

Abstract

The invention relates to a novel water collection and backwashing sand filter. The sand filter comprises a tank body, wherein the upper part and the lower part of the tank body are respectively provided with a water inlet, a vent port, a water outlet and an air inlet, the middle part inside the tank body is a filter material layer, a screen plate is arranged inside the filter material layer, the screen plate is provided with a plurality of filter caps and a homogenizing filter material, a collection chamber is arranged below the screen plate, a water collection air distribution pipe is arranged inside the collection chamber, and the water collection air distribution pipe is communicated with the water outlet and the air inlet. The novel water collection and backwashing filter can thoroughly filter the sand and effectively intercept the fine organic particles, and the filtering efficiency is high; thoroughness in backwashing can be realized, the washing water can be saved, and the processing capacity can be increased; and the flow area of the filter cap is large, and the filter cap is anti-aging, has good pressure resistance and long service life, is hardly damaged, is safe and reliable and has low comprehensive cost; and the floor occupied area is small, rapidness in installation can be achieved, the investment can be saved, and convenience for operation and maintenance can be realized; and the tank bodies are connected in parallel for use, so that convenience for backwashing can be achieved.

Description

technical field [0001] The invention relates to a sewage filtering device, in particular to a novel water collecting and backwashing sand filter. Background technique [0002] Sand filters are widely used in various industries as a common filtering equipment. In order to prevent the filter material from entering the water distribution system and evenly distribute water during flushing, the traditional sand filter has a cushion (supporting layer) between the filter layer and the water distribution system. The cushion layer is generally made of natural pebbles or crushed stones, and the weight of the equipment is relatively heavy. In addition, in the process of backwashing, the traditional sand filter often suffers from chaotic layers due to the support layer, resulting in the loss of small-sized filter materials and the deterioration of effluent water quality. In order to overcome the shortcomings of the traditional sand filter, the third-generation sand filter adopts homog...

AI Technical Summary

Problems solved by technology

However, the plastic filter head is easily damaged, the filter cap is easy to loose, and the service life is not long. In order to prevent the filter material from running out, it needs to be checked and replaced regularly

The traditional sand filter and the third-generation sand filter often have incomplete backwashing and the frequency of backwashing increases, which greatly increases the amount of backwashing water

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