Purification of waste liquid in chlorinated hydroc

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German prosys (located in Bremen, western Germany) has recently developed a photocatalytic process to oxidize organic pollutants such as phenol, chlorobenzene, chlorinated phenol and polychlorinated biphenyls, which can not be rapidly biodegradable. The commonly used photooxidation process requires the use of ultraviolet lamps and power supply facilities, while the new process of German company is operated with visible radiation obtained from the sun

method: firstly, the waste liquid flow is continuously transferred into a tubular reflux reactor. There, the air sprayed from the lower end of the reactor to the upper part circulates the liquid flow and catalyst upward from the center, and descends along the reactor wall. The catalyst is supported on a spherical carrier with a dye similar to chlorophyll. The dye absorbs visible light from the sun and transfers energy to dissolved oxygen (from the air) to produce more reactive O2, thereby oxidizing the pollutants

the company said: it was found in the laboratory test that the phenol concentration could be reduced from 650 mg/L to below the detection limit after a 40 minute residence time. At present, the company is running a medium-sized experimental device with simple preparation method and low cost of 0.5m 3 · H-1 in the shipyard where it is not coming to "buy time" to enter the field of auto parts, in order to eliminate pollutants such as tributvltin

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