Fenton technology based sewage treatment system and treatment method thereof

Abstract

The invention discloses a Fenton technology based sewage treatment system and a treatment method thereof. The treatment system comprises a sand filtering tank, a Fenton reactor, a reaction tank and aclean water tank which are sequentially connected, wherein the sand filtering tank has a structure for trapping pollutants from sewage; the Fenton reactor is used for producing hydroxyl free radicalsin a manner that activated charcoal serves as a catalyst and reacts with hydrogen peroxide; the reaction tank is used for removing superfluous hydrogen peroxide from the Fenton reactor; the clean water tank is used for adjusting a pH value of the sewage in the clean water tank. According to the Fenton technology based sewage treatment system and the treatment method thereof, the design is ingenious, activated charcoal serves as an adsorbent and also serves as a catalyst; on one hand, pollutants can be enriched through an adsorptive action, and the content of the pollutants is lowered; meanwhile, the activated charcoal catalyzes H2O2 to form .OH free radicals, the .OH free radicals fully react with and degrade the pollutants, and the reaction efficiency is greatly increased; furthermore, the activated charcoal does not participate in a reaction as a reactant during reaction, and the amount of the activated charcoal cannot be reduced along with the reaction, so that the consumption of agents is greatly lowered, tedious operations of repeatedly adding the agents are saved; meanwhile, the yield of sludge is reduced, and the operating cost is reduced.

Description

Technical field [0001] The invention relates to the field of sewage treatment, in particular to a sewage treatment system based on Fenton technology and a treatment method thereof. Background technique [0002] A large amount of industrial waste water produced in the chemical, textile, pharmaceutical, electroplating and other industries has complex components, various types, high COD concentration, poor biodegradability, and poisonous and harmful properties. If effective control and treatment are not carried out, it will Caused irreparable pollution and damage to the environment, so various sewage treatment technologies came into being. [0003] Among them, Fenton oxidation treatment is an important research direction. Fenton reaction is mainly through hydrogen peroxide (H 2 O 2 ) The mixed solution with ferrous ions oxidizes many known organic compounds such as carboxylic acids, alcohols, and esters to inorganic states. The reaction has high ability to remove refractory organic po...

AI Technical Summary

Problems solved by technology

[0006] (1) High cost and easy to cause secondary pollution

[0007] The loss of iron ions leads to the need to continuously add ferrous reagents during the reaction process. The addition of iron ions increases the color of the water. At the same time, a large amount of iron sludge will be formed after neutralization with alkali, resulting in the loss of iron ions and secondary pollution. In practical applications , the cost of follow-up iron slime treatment is far greater than the cost of dosing chemicals and the energy consumption in the reaction process

[0008] (2)H 2 o 2 low utilization

[0009] Fe 2+ and H 2 o 2 It is not only the catalyst and oxidant required by the system, but also the capture agent of OH, so when the input amount is insufficient, the reaction rate is low, and when the input amount is too high, the quenching reaction of OH makes H 2 o 2 lower utilization of

[0010] (3) The pH range of the Fenton system is narrow

[0011] In the Fenton reaction, Fe 2+ Only under strong acidic conditions (generally pH 2-3) can the H 2 o 2 OH is produced, so the pH value of the water needs to be adjusted before the reaction, which is easy to cause corrosion to the reaction equipment and other problems

After the reaction, a large amount of alkali needs to be used to neutralize the acid in the water body, which increases the treatment cost, and also increases the salinity in the water body, which increases the difficulty of subsequent treatment

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