Multi-layer type sewage treatment device

Abstract

The invention relates to a sewage treatment device with a plurality of layers, and comprises a front treatment device and a back treatment device, wherein a water communicating layer in the front treatment device is staggered and laid in an earth block in the manner of overlapping in a plurality of layers; the earth block is formed by filling earth treated in advance in a porous container with an opening ratio of 45+ / -10 percent; the back treatment device comprises an active carbon treatment layer treated by microorganism and an oyster shell treatment layer completely washed and desalted. The sewage is treated by the treatment earth layer in the front treatment device 1, and then passes through the active carbon treatment layer 3 of the back treatment device 2, and is deodorized and decolored by the active carbon treated by microorganism, then flows to the oyster shell treatment layer 4 to remove P and N in the water; through the repeated treatment, the sewage can be ensured by good effects of decoloring, deodorizing, and reducing P and N.

Description

technical field [0001] The invention relates to the technology of a sewage purification device for treating sewage. Background technique [0002] The purification device that utilizes the sewage purification ability of the soil to process sewage has the technology disclosed in CN1373090 as "multi-layer sewage purification device and its soil block". This technology is to add pre-treated soil in a porous container to form soil The block body is embedded in the water-passing layer in a staggered overlapping multi-layer manner, and the soil block body is directly used as the treatment soil layer in the purification device. [0003] The problem that this kind of sewage purifying device exists, one is that although the porous container is used to fill the soil, the relationship between the porosity of the soil used and its permeability is ignored. In fact, when sewage treatment is carried out, the opening of the porous container The rate directly affects the residence time of se...

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Problems solved by technology

[0003] The problem that this kind of sewage purifying device exists, one is that although the porous container is used to fill the soil, the relationship between the porosity of the soil used and its permeability is ignored. In fact, when sewage treatment is carried out, the opening of the porous container The rate directly affects the residence time of sewage in the treated soil layer, thus affecting the effect of water treatment

The second is that when the sewage is treated as circulating water by multi-layer soil blocks alone, after a certain period of time, the circulating water will produce peculiar smell, turn yellow, and be unpleasant to use; The water in the water is also prone to the deposition of P and N, producing eutrophication sources

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