(1) Multi-media filter


The design of the filter layer of the multi-media filter, the main consideration:
A different filter has a large density difference, to ensure that the anti-wash disturbance does not occur after the phenomenon of mixed-layer.
2, select the filter according to the production of water use.
3, the diameter of the lower filter particle size less than the upper filter media particle size, in order to ensure the effectiveness of and make full use of the lower filter. In fact, in the case of three-layer filter bed, the upper filter the largest size, the density of light filter composition, such as anthracite, activated carbon; center middle filter particle size, density, center, is generally composed of quartz sand; lower filter by the smallest particle size, density of the largest heavy media composition, such as magnetite. Due to poor density limit, the three-layer dielectric filter media is basically fixed. Onwards the role of the coarse filter of the upper filter and lower filter from the role of the fine filter, so give full play to the role of multi-media filter bed, water quality is significantly better than single-layer filter media filter bed
(2) activated carbon filter

Water pretreatment system, activated carbon filter can absorb the chlorine pre-filter can not be removed to prevent the level after reverse osmosis membranes subject to oxidative degradation, but also adsorption of small organic molecules and other polluting substances, the former level leak over more obvious role in the adsorption of the smell of water, colloidal pigment, heavy metal ions, but also to reduce the COD. Can further reduce the value of the RO feed SDI, to ensure that the SDI <5, TOC <2.Oppm,.
<- 5 -> activated carbon filter work is done through the carbon bed. Up the charcoal bed of activated carbon particles have a very large number of micropores and a huge surface area, has a strong physical adsorption. Water through the carbon bed of organic pollutants in water by activated carbon to adsorption. In addition, the non-crystalline part of the surface of activated carbon, some oxygen-containing tube group, activated carbon adsorption of organic pollutants in water through the carbon bed. The activated carbon filter is a more commonly used in water treatment equipment, as the former water treatment desalination system level device can effectively ensure the life and improve water quality, prevent pollution, especially to prevent the stage reverse osmosis membrane, ion exchange resins, etc. free I oxygen poisoning pollution.
The main factors to affect the adsorption performance and service life of the activated carbon filter: the type and concentration of pollutants, the residence time of air in the filter material, the air temperature and humidity.
The actual selection, according to the types of pollutants, concentration and processing amount of wind conditions to determine the form of filters and activated carbon types.
Upstream and downstream of the activated carbon filter should have a good dust filter efficiency specifications shall not be less than the F7. The upstream filter to prevent dust from clogging the activated carbon material; downstream filter stopped by activated carbon dust.