Catalytic oxidation method capable of recycling waste residues

Abstract

The invention discloses a catalytic oxidation method capable of recycling waste residues, which comprises (1) delivering wastewater to be treated into an oxidation reactor, adding an acid to adjust the pH value of the wastewater and adding an oxidizer and ferrous iron ions (Fe<2+>) serving as a catalyst to perform catalytic oxidation reaction; (2) adding an alkali into the wastewater obtained after the completion of the reaction to adjust the pH value of the wastewater, and delivering the wastewater to a settling basin for flocculating setting; (3) after the completion of the settling, discharging supernatant, delivering the settled waste residues into a reduction reactor, adding an acid into the waste residues to adjust the pH value of the waste residues, dissolving the waste residues toform solution containing ferric ion (Fe<3+>), and adding a reducer to reduce the Fe<3+> into Fe<2+> at the same time; and (4) circulating the reduced solution containing the Fe<2+> to an oxidation reactor to use the solution as a catalyst to perform the catalytic oxidation reaction. Compared with the conventional catalytic oxidation, the method reduces the discharge of waste iron residues, reducesthe waste iron residue treatment cost, protects environment, reduces the usage amount of the catalyst in a catalytic oxidation process and saves resources.

Description

Technical field

[0001] The invention relates to a catalytic oxidation treatment method for sewage treatment, in particular to a method for recycling waste residues generated in the process of catalytic oxidation treatment of wastewater. Background technique

[0002] For a long time, the treatment of organic wastewater with low B / C ratio in the environment has always been a difficulty in water treatment technology, and it is also an important problem that plagues the environmental circles of all countries in the world. Due to the low B / C ratio and poor biodegradability of this type of wastewater, it is difficult to directly treat it by biochemical methods. It is basically ineffective to treat through conventional methods such as ordinary filtration and flocculation, and the cost of advanced treatment technologies such as activated carbon adsorption is too high. Separation technology also has certain difficulties in application due to practical problems such as expensive investment...

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