Carbon-sand double filter tank with central canals

Abstract

The invention provides a carbon-sand double filter tank with central canals. Three layers of central canals, namely an upper-layer produced water drainage channel, a middle-layer sand tank drainage channel and a lower-layer carbon tank water inlet channel, are arranged in the center of a carbon tank, and the lower-layer carbon tank water inlet channel is also used as a back-washing gas distribution channel; two layers of central channels, namely an upper-layer drainage channel and a lower-layer back-washing water and gas distribution channel, are arranged in the center of a sand tank; and thecarbon tank and the sand tank are separated by a partition wall and are communicated only through upper-layer water passing holes of the central channels. After entering, the water to be treated is treated by an upward flow activated carbon adsorption tank, then enters the sand tank from the water passing holes in the partition wall, is filtered in the sand tank and then is discharged. The carbon-sand double filter tank with central canals provided by the invention is reasonable and feasible in tank type combination, compact in arrangement, simple in structure, low in manufacturing cost, few in pipelines and small in occupied area.

Description

technical field [0001] The invention relates to the field of water supply treatment, in particular to a carbon-sand double filter tank with a central channel used in advanced treatment of water supply plants, treatment of sewage plants and special water treatment. Background technique [0002] At present, the ozone biological activated carbon process and sand filter process are mostly used in the advanced treatment of waterworks, sewage treatment and special water treatment. The ozone biological activated carbon process has a better removal rate for natural organic matter and ammonia nitrogen in raw water. Sand filtration The pool process has a better removal rate for particulate matter in water. There are two forms of biological activated carbon adsorption pools in the ozone biological activated carbon process: downflow fixed bed and upflow fluidized bed. It is more common to use a downward-flowing fixed-bed biological activated carbon adsorption tank, but in recent years,...

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Problems solved by technology

[0003] Although the treatment effect of the upward flow activated carbon adsorption pool is good, due to the lack of a suitable pool structure, the difficulty of uniform water distribution and the high cost of the filter, there are many restrictions in the actual layout of the water plant, and the pool type of the subsequent treatment process poor composition

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