A, activated carbon is the most widely used adsorbent, among its lattice organization have various shapes of micro hole, forming the unique porous structure, and therefore a huge adsorption area, so the strong adsorption ability.Adsorption of activated carbon filter USES the method can effectively remove the organic matter in the water, colloid, heavy metals, remove residual chlorine and other bad smell, decrease chroma of the water, are widely used in factories, town water purification, and reverse osmosis, ultrafiltration, pretreatment process of ion exchange system and improve the water quality of all kinds of deep purification equipment.
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Activated carbon with coal, charcoal, stone of the fruit and fruit shell as raw material, through high temperature carbonization and activation is handled and become, has a large specific surface area activated carbon with 800 ~ 2000 m2 (1 g).The adsorption ability of active carbon has a very high.Activated carbon used in chloride hypochlorite was adsorbed on activated carbon surface, broken down into hydrogen chloride and atomic oxygen.Oxygen and carbon atoms by adsorption state rapidly into a combined oxidation (carbon).So the activated carbon adsorption saturation problem of dechlorination did not exist, just lost a small amount of carbon.Therefore, activated carbon dechlorination can run long time.Activated carbon can not only dechlorination, but also can filter out suspended solids in tap water residue, humic acid, colloid, heavy metals, smell.Activated carbon regeneration of activated usually adopt heating method, the activated carbon in 500 ~ l000 ° C under the condition of high temperature, the adsorption on the surface of the activated carbon, organic matter is decomposed into carbon dioxide and water;Also can use high pressure steam purge or soaking with sodium hydroxide solution regeneration.
Activated carbon filter in general as a feed water treatment or the depth of the sewage treatment equipment, mainly to remove suspended matter, organic matter, chromaticity and so on, at present, because the price of activated carbon is more expensive, the most the difficulty of regeneration so limit its usefulness, in the case of conditional use it is ideal.
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Second, the operation steps
1. The filter material inside the adsorber, can be loaded at the bottom of the quartz sand suction 0.15 ~ 0.4 meters high, as support layer, quartz sand particles can use 20-40 mm, quartz sand can be loaded on the 1.0-1.5 meters of granular activated carbon as a filter layer.
2. The filter before loading, quartz sand at the bottom of the filter, should carry on the solution of stability test, soak after 24 hours, meet the following requirements:
(1) the type of solid content of the increase of no more than 20 mg/L.
(2) the increase of oxygen consumption of no more than 10 mg/L.
(3) after soaking in alkaline medium, the increase of silicon dioxide is not more than 10 mg/L.
3. Quartz sand into the equipment shall be carefully cleaned and after rinse water to rinse, should by the dirty water from the lower discharge, until the water clarification, then load the granularity, activated carbon filter, wash again, water rinse, bottom-up dirty water through the upper.
4. The adsorber, raw water from the upper part of imported downstream, when sewage water quality drop too much, can undertake backwashing, backwashing time, visual details purge a daily or weekly.
(1) the backwashing cannot have run sand phenomenon.
(2) meet with backwashing water in excess of the prescribed time when still can not meet the requirements, should check repair equipment, and shall not increase the speed of backwashing.
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