Composite flocculant for quick treatment of coke quenching wastewater and use method thereof

Abstract

The invention discloses a composite flocculant for quick treatment of coke quenching wastewater and a use method thereof. The composite flocculant consists of a catalyst main body and an oxidant mainbody, wherein the catalyst main body is a trivalence iron ion, the oxidant main body is a hypochlorite ion, and the molar ratio of the trivalence iron ion to the hypochlorite ion is 1:5; the trivalence iron ion is selected from one of polyferric sulfate, ferric oxide and the like; the hypochlorite ion is selected from chloride gas and deriavative thereof, and one of hypochlorite, chlorate, chlorine dioxide and the like. The composite flocculant has the advantages that the catalytic oxidation function is utilized, the oxidative reduction reaction is generated with the wastewater, and the organic matters are quickly oxidized and decomposed; the prepared composite flocculant can be used for quickly treating the coke quenching wastewater, the supernatant of the treated coke quenching wastewater can meet the requirements of 4.1.5 in national Emission Standard of Pollutants for Coking Chemical Industry (GB 16171-2012), and be used for the repeated dosage quick treatment process after coke quenching, and the purpose of recycling of the coke quenching wastewater is realized.

Description

Technical field [0001] The invention specifically relates to a composite coagulant for rapid treatment of coke quenching wastewater and a method of use thereof. It belongs to the field of coking wastewater treatment. Background technique [0002] Coke quenching is an important process in coke production. Different coke quenching methods directly affect the emission of pollutants in coke production. At present, the widely used coke quenching processes include wet quenching and dry quenching. In In actual production, most coking companies use wet quenching. [0003] In wet coke quenching, the water vapor generated during coke quenching is discharged into the atmosphere from the top outlet of the coke quenching tower, and air pollutants such as coke dust are entrained in the water vapor, and the pollutants are discharged in an organized and intermittent manner. In the quenching process, 0.5 tons of water needs to be evaporated per ton of coke. The harmful gases contained in the stea...

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Problems solved by technology

[0009] The main problems of the coke quenching wastewater used in the wet coke quenching process of coking enterprises are complex water quality, high concentration and high toxicity, especially CODCr, NH3-N and volatile phenols are indicators that are difficult to control and quickly reduce the concentration. If the traditional biochemical method is used for treatment, there are problems such as complicated treatment process and long treatment time (more than 8 hours). If various advanced oxidation technologies (such as Fenton, ozone oxidation, photocatalytic oxidation, etc.) are used, it is easy to reach the standard, but There are problems such as high one-time investment, high cost per ton of water, easy generation of secondary pollutants, and high risk of system operation

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