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A method for treating phenolic wastewater

A technology for phenolic wastewater and wastewater, which is applied in the field of treating phenolic wastewater, can solve the problems that phenolic wastewater cannot meet the treatment requirements, and achieve the effects of low cost, less material, and simple operation

Inactive Publication Date: 2015-08-05
JILIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] The purpose of the present invention is to provide a method for treating phenol-containing wastewater in order to solve the problem that the existing methods for treating phenol-containing wastewater cannot meet the treatment requirements

Method used

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  • A method for treating phenolic wastewater

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Experimental program
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Effect test

specific Embodiment approach 1

[0024] The water sample is phenol cyanide coking wastewater, COD=5120mg / L, volatile phenol=298mg / L.

[0025] Experiment 1: Determining Polymerized AlCl 3 Dosage, take 5 waste water samples, each 500mL, the measured pH value is 6-7, respectively add the polymerized AlCl with a mass concentration of 10% 3 Solution, the dosage is 5mL, 6mL, 7mL, 8mL, 9mL, stir evenly, then add 40mL polyacrylamide solution with a mass concentration of 0.1% as a coagulant, stir evenly, let stand for 20min, observe 5 water samples of. Add 5 mL of polymerized AlCl 3 The precipitated flocs of the sample were in small pieces, the supernatant was turbid, and the interstitial water was turbid, indicating that the amount of polyacrylamide added was appropriate, while the polymerization of AlCl 3 The amount of addition is not enough; add 6mL polymerized AlCl 3 The precipitated flocs of the samples were in the form of small pieces, the supernatant was clear, and the interstitial water was relatively clea...

specific Embodiment approach 2

[0030] Compared with the specific embodiment one, adding H in 3 times 2 o 2 , add 2mL H every 15min 2 o 2 . After the secondary flocculation is completed, COD=350mg / L, volatile phenol=7.8mg / L, and the total removal rate of COD and volatile phenol is about 93.2% and 97.4% respectively. h 2 o 2 The effect of multiple dosing is better than that of single dosing.

[0031] Take the supernatant and adsorb with activated carbon for about 1 h at room temperature. At this time COD≈140mg / L, volatile phenol=3mg / L. At this time, the total removal rate of COD is about 97.5%, and the total removal rate of volatile phenol is about 98.9%, which is a light yellow transparent liquid. It has reached the national secondary standard for comprehensive sewage discharge.

specific Embodiment approach 3

[0033] Compared with the second embodiment, after adjusting the pH of the water sample to 4-6, first add zero-valent iron iron flakes to react for about 20 minutes, and then add H in 3 times 2 o 2 , Reaction 0.5 ~ 1h. After the secondary flocculation, the measured COD=310mg / L, volatile phenol=6.2mg / L. It shows that appropriately increasing the reaction time of zero-valent iron can increase the treatment of organic matter.

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Abstract

The invention discloses a phenolic wastewater treatment method which comprises the following steps: firstly, performing chemical flocculation; secondly, improving a zero-valent iron-Fenton system reaction; thirdly, performing secondary flocculation; fourthly, performing active carbon adsorption. The phenolic wastewater treatment method has the benefits as follows: the zero-valent iron-Fenton system reaction is taken as the core and combined with inorganic flocculation and active carbon to effectively treat phenolic wastewater which is high in concentration, high in toxicity and difficult to biochemically degrade; the material consumption is low, the cost is low, the operation is easy, and the treatment effect is good.

Description

technical field [0001] The invention relates to a wastewater treatment method, in particular to a method for treating phenol-containing wastewater. Background technique [0002] At present, phenolic wastewater is a highly toxic and refractory organic wastewater commonly found in industrial wastewater, mainly from coal chemical industry, petrochemical factory, pharmaceutical factory, phenol and phenolic resin production factory, etc. The quality of phenolic wastewater is complex, variable, and difficult to biodegrade. Common methods include adsorption, extraction, and oxidation. However, it is often difficult to achieve the desired treatment effect by using a single treatment method, so the combination of several technologies can be considered. A method that can efficiently, economically and stably treat phenol-containing wastewater must become the research focus and hotspot of scholars at home and abroad. [0003] Advanced oxidation technology uses hydroxyl radical oxidat...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/04
Inventor 刘淼陈力可
Owner JILIN UNIV