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A method for treating refractory organic wastewater and the multi-component catalyst used therein

An organic wastewater, refractory technology, applied in physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, chemical instruments and methods, etc., can solve the problem of immature large-scale engineering applications and large power consumption and other problems, to achieve the effects of less catalyst consumption and loss, low operating costs, and mild reaction conditions

Active Publication Date: 2017-03-15
武汉森泰环保股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This method consumes a lot of power and is not suitable for treating wastewater with high content of color and suspended solids, and large-scale engineering applications are not yet mature.

Method used

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  • A method for treating refractory organic wastewater and the multi-component catalyst used therein

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Comparison scheme
Effect test

Embodiment 1

[0042] Example 1: Treatment of refractory wastewater in a chemical industry park, wastewater COD Cr The average is 537mg / L, the pH is about 7.5, and the oxidant is 30% mass concentration hydrogen peroxide. The experimental steps are as follows: the dosage of hydrogen peroxide is 500 mg / l, and after the hydrogen peroxide and waste water are fully mixed for 0.5h, enter the Fenton-like hydrogen peroxide filled with the present invention. Multi-catalyst reaction column, the reaction column is made of De160 UPVC pipe closed at both ends, 1.0m high, filled with 5kg of the above-mentioned catalyst, the water flow rate is 4L / h, continuous operation, the residence time of wastewater in the reaction column is 1.5 h, effluent COD after reaction Cr The concentration is 376mg / L, COD Cr The average removal rate was 30.0%. The influent flow rate is halved or the residence time of wastewater in the reaction column is doubled, and the COD Cr The removal rate increased by about 5.2%; increas...

Embodiment 2

[0044] Example 2: Composite catalysts of different proportions are used to treat refractory wastewater. The water sample to be treated is the same as in Example 1. Hydrochloric acid and sodium hydroxide are used to adjust the pH value of the wastewater. The oxidant is 30% mass concentration hydrogen peroxide, and the mass ratio of activated carbon to iron alloy is 1. : 2, experimental procedure is the same as embodiment 1, specifically as follows: hydrogen peroxide dosage is 500mg / l, after hydrogen peroxide and waste water fully mix 0.5h, enter respectively the reaction column that is filled with the multiple catalyst of different proportioning, reaction column is made of De160 The two ends of the UPVC pipe are closed, the height is 1.0m, and the above-mentioned catalyst is filled with 5kg, the water flow rate is 4L / h, and the continuous operation, the residence time of the wastewater in the reaction column is 1.5h. Partial Composite Catalyst Fe, Cu, Mn Compound Ratio and Waste...

Embodiment 3

[0048] Embodiment 3: adopt the composite catalyst of different Fe-containing compounds to treat wastewater, the wastewater to be treated is the same as in Example 1, adopt ferroalloy, iron filings, and iron oxide powder according to the present invention respectively, and the mass ratio of activated carbon to Fe-containing compounds is 1:2, The mass ratio of Fe-containing compound, Cu compound and Mn-containing compound is 1:1:0.5. The experimental procedure is the same as in Example 1. The specific steps are as follows: the dosage of hydrogen peroxide is 500mg / l, and after the hydrogen peroxide and wastewater are fully mixed for 0.5h, enter The reaction column is filled with a multi-component catalyst that does not contain Fe compounds. The reaction column is made of De160 UPVC pipe with both ends closed. It is 1.0m high and filled with 5kg of the above-mentioned catalyst. The residence time in the reaction column is 1.5h, and the system runs continuously for 1 month. Ferroal...

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Abstract

The invention discloses a method for processing degradation-resistant organic wastewater through a Fenton-like multi-element catalytic oxidation technology. The method comprises the following steps: adding an oxidant into to-be-treated degradation-resistant organic wastewater and sufficiently mixing to obtain a mixture; introducing the mixture into a reactor to perform oxidization and reduction reaction; filling the reactor with a multi-element catalyst; processing the wastewater until the COD Cr removal rate is 25-35%. The invention further relates to a multi-element catalyst used for processing degradation-resistant organic wastewater. The method is used for degradation-resistant organic wastewater, a multi-element Fenton-like reagent comprising a catalytic oxidant is coppered with catalytic oxidization action to generate a series of free radical reactions, so that output of high-concentration high-strength hydroxyl free radical is realized, the transfer ability of hydrogen peroxide is greatly improved, and the strong-oxidization degradation of degradation-resistant organic substances in the wastewater by the hydroxyl free radical is realized. According to the method disclosed by the invention, the reaction conditions are gentle, much acid or alkaline is not required to regulate the pH value, sludge is not generated in the processing process, and the method can be used for pretreatment and posttreatment of the degradation-resistant organic substances, so that the up-to-standard emission is guaranteed, and the application prospect is wide.

Description

technical field [0001] The invention belongs to the technical field of wastewater treatment, and relates to a method for treating refractory organic wastewater using a Fenton-like multi-component catalytic oxidation technology, and also relates to a multi-component catalyst. Background technique [0002] Refractory organic matter refers to COD Cr Higher concentration and BOD 5 Relatively low organic matter that is not easily decomposed by microorganisms or decomposed very slowly, and is not completely decomposed (including some metabolic intermediate products of organic matter). Such pollutants are easy to accumulate in organisms and become potential sources of water pollution. With the rapid development of my country's economy, more and more organic industrial wastewater is discharged every day, of which refractory organic wastewater accounts for a large proportion, mainly from coking wastewater, pharmaceutical wastewater, petrochemical wastewater, textile / printing and dye...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F1/72C02F1/70B01J23/889
Inventor 杨文斌彭继伟左洛舒四平
Owner 武汉森泰环保股份有限公司
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