Fenton sewage treatment process and equipment thereof

Abstract

The invention relates to a Fenton sewage treatment process and equipment thereof. The process sequentially comprises the following steps: (a) regulating pH value of sewage; (b) adding H2O2 and Fe<2+> to the sewage; (c) adding alkali to generate iron sludge sediment; (d) separating the iron sludge sediment from supernatant liquid; (e) carrying out biochemical treatment after the supernatant liquid outflows; adding acid to discharged muddy liquid containing the iron sludge sediment so that the iron sludge sediment is dissolved; and (f) oxidizing and breaking an iron complex in the solution outflowing in the step (e) into Fe<3+> through electro-catalytic oxidation; electrolyzing and reducing Fe<3+> into Fe<2+> through electrolytic reduction, and refluxing so that the Fe<3+> is sufficiently electrolyzed and reduced into Fe<2+>; and replacing Fe<2+> added in the step (b) with the Fe<2+> obtained through electrolytic reduction. The equipment comprises a pH regulating tank, a Fenton reaction tank, a reaction tank and a sedimentation basin, and further comprises a reflux pump, a dissolving tank and electrolytic regeneration equipment, wherein the electrolytic regeneration equipment comprises an electro-catalytic oxidation device and an electrolytic reduction device. According to the process disclosed by the invention, recycling of iron is realized and discharge of iron slurry is greatly reduced.

Description

technical field [0001] The invention relates to a Fenton sewage treatment process and equipment thereof, belonging to the field of sewage treatment. Background technique [0002] Fenton oxidation technology is a wastewater treatment method based on chemical oxidation of Fenton reagents. Fenton's reagent is derived from H 2 o 2 and Fe 2+ A mixed oxidizing agent with strong oxidizing power. Its oxidation mechanism is mainly under acidic conditions (generally pH<3.5), using Fe 2+ as H 2 o 2 The catalyst can generate OH with strong oxidative electricity and high reactivity. Hydroxyl radicals will form organic free radicals with refractory organic substances in aqueous solution to destroy their structures, and finally oxidize and decompose. At the same time Fe 2+ is oxidized to Fe 3+ Coagulation and precipitation are generated, and a large amount of organic matter is condensed and removed. The main reaction of Fenton oxidation technology is as follows: [0003] Fe ...

AI Technical Summary

Problems solved by technology

Therefore, it is very necessary to develop iron resources that can efficiently recycle iron resources, and effectively control the accumulation of organic matter and heavy metals leading to the problem of substandard effluent, while improving the treatment effect of Fenton oxidation, reducing operating costs, and solving the problem of large iron sludge production.

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