Multi media filter

在水处理上使用的多介质过滤器，常见的有：无烟煤-石英砂-磁铁矿过滤器，活性炭-石英砂-磁铁矿过滤器，活性炭-石英砂过滤器，石英砂-陶瓷过滤器等。

The common multi-media filters used in water treatment include anthracite quartz sand magnetite filter, activated carbon quartz sand magnetite filter, activated carbon quartz sand filter, quartz sand ceramic filter, etc.

多介质过滤器的滤层设计，主要考虑的因素为：

The main factors considered in the design of filter layer of multi-media filter are as follows:

1、不同滤料具有较大的密度差，保证反洗扰动后不会发生混层现象。

1. Different filter media have large density difference, which can ensure that mixing layer will not occur after backwashing disturbance.

2、根据产水用途选择滤料。

2. Filter media should be selected according to the use of produced water.

3、粒径要求下层滤料粒径小于上层滤料粒径，以保证下层滤料的有效性和充分利用。

3. The particle size of the lower filter material is required to be smaller than that of the upper filter material to ensure the effectiveness and full utilization of the lower filter material.

事实上，以三层滤床为例，上层滤料粒径，有密度小的轻质滤料组成，如无烟煤、活性炭；中层滤料粒径居中，密度居中，一般为石英砂组成；下层滤料由粒径更小，密度的重质滤料组成，如磁铁矿。由于密度差的限制，三层介质过滤器的滤料选择基本上是固定的。上层滤料起粗滤作用，下层滤料起精滤作用，这样就充分发挥了多介质滤床的作用，出水水质明显好于单层滤料的滤床。而对于饮用水，一般禁止使用无烟煤，树脂等滤料。

In fact, taking the three-layer filter bed as an example, the upper layer filter material has the largest particle size and is composed of light filter materials with small density, such as anthracite and activated carbon; the middle layer filter material has the middle particle size and density, and is generally composed of quartz sand; the lower layer filter material is composed of heavy filter materials with the smallest particle size and the largest density, such as magnetite. Due to the limitation of density difference, the selection of filter material for three-layer media filter is basically fixed. The upper filter material plays the role of coarse filtration, and the lower filter material plays the role of fine filtration. In this way, the function of multi-media filter bed is brought into full play, and the effluent quality is obviously better than that of single-layer filter bed. For drinking water, anthracite, resin and other filter media are generally prohibited.

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