Agent and method for reducing COD (chemical oxygen demand) of phenolic wastewater

A technology for phenol wastewater and wastewater, applied in the field of COD reagents, can solve the problems of high energy consumption and treatment costs, and achieve the effects of fast treatment speed, reduced COD value, and low cost

Inactive Publication Date: 2013-03-06
TIANJIN BINHUAN CHEM ENG TECH RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it is only suitable for the advanced treatment of low-concentration phenol-containing wastewater, and the energy consumption and treatment costs are relatively high.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] The COD value of raw water is 4964mg / L.

[0027] A reagent and method for reducing COD of phenol-containing wastewater, the steps are as follows:

[0028] 1. Experimental steps

[0029] Add 10ml of hydrogen peroxide and 1.8g of ferrous sulfate at a concentration of 30% by mass to 500ml of phenol-containing wastewater, heat, and use a magnetic stirrer to make it fully react, a large number of bubbles appear in the solution, and the color of the solution turns dark red , After 30 minutes, no bubbles will be generated in the solution, and the color of the solution will become stable, indicating that the hydrogen peroxide has been fully reacted, and then add 2g-8g of potassium permanganate with different masses to observe its removal effect on COD.

[0030] After adding 8g of potassium permanganate for treatment, the concentration of COD in the solution varied between 1150-1250mg / L; after adding 6g of potassium permanganate for treatment, the concentration of COD in the wa...

Embodiment 2

[0033] The COD of the raw water sample is 7680mg / L. In this embodiment, after adding Fenton's reagent twice, potassium permanganate is added to reduce COD in wastewater.

[0034] A reagent and method for reducing COD of phenol-containing wastewater, the steps are as follows:

[0035] 1. Dosing Fenton reagent once

[0036] Take four 2L beakers, add 500ml of mixed waste water to them, then add 20ml of hydrogen peroxide and 3.5g of ferrous sulfate, 15ml of hydrogen peroxide, 2.5g of ferrous sulfate, 10ml of hydrogen peroxide and 1.8g of ferrous sulfate, and 5ml of hydrogen peroxide and 1g of ferrous sulfate, Put the beaker on a magnetic stirrer and stir for 30 minutes, then let it stand for 3 hours to see its treatment effect on COD. After measurement, the COD values ​​are 4752mg / L, 3712mg / L, 3776mg / L, 4592mg / L, The removal rates of COD were 38.125%, 51.67%, 50.83%, and 40.21%. After filtering the treated solution, 7g of potassium permanganate was added to it, and the solution ...

Embodiment 3

[0041] Raw water COD 7680mg / L.

[0042] A reagent and method for reducing COD of phenol-containing wastewater, the steps are as follows:

[0043] 1. Take 10L of mixed water and put it into a plastic bucket, add 150ml of hydrogen peroxide and 22.5g of ferrous sulfate into it, stir with a stirring paddle for 30 minutes, let it stand for 3 hours, filter out the precipitate, then add 150ml of hydrogen peroxide and 22.5 g ferrous sulfate, filter out the precipitate (approximately 9L of water remains), add 100g of potassium permanganate to it, heat to 70 degrees, react for 30 minutes, and after standing for 12 hours, take a sample to measure COD, and the measured COD of the water sample is 800mg / L, the corresponding COD removal rate is 89.58%.

[0044]2. Put 12L, 15L, and 20L mixed water into 3 plastic buckets, add 150ml hydrogen peroxide and 15g ferrous sulfate, 200ml hydrogen peroxide and 20g ferrous sulfate, 250ml hydrogen peroxide and 25g ferrous sulfate, and stir with a stirri...

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Abstract

The invention relates to an agent and a method for reducing COD (chemical oxygen demand) of phenolic wastewater. The method comprises the following steps: (1) Fenton's reagent is added to wastewater; (2) potassium permanganate is added to the wastewater; and the addition of the Fenton's agent and the potassium permanganate is adjusted to reduce the COD value of the wastewater until the treated water with the target content of COD value is finally obtained. The Fenton's agent adopted in the invention is lower in price, and the dosage of the Fenton's agent is increased, so that the dosage of the potassium permanganate is reduced, and the removal rate of COD in the wastewater is improved by more than 85%.

Description

technical field [0001] The invention belongs to the field of sewage treatment, in particular to a reagent and a method for reducing the COD of phenol-containing wastewater. Background technique [0002] With the development of the world economy and the process of urbanization, the demand for water is constantly increasing, and the discharge of wastewater is also increasing. The pollution of phenolic wastewater to water bodies has caused domestic and foreign social circles widespread attention. [0003] Phenolic compounds are a kind of protoplasmic poison, which can be inhaled through skin and mucous membrane contact or immersed in the organism through the mouth, and form insoluble protein after contacting with the protein in the cell original plasma to inactivate the cell, especially for the nervous system. Larger affinity can cause nervous system lesions. Phenol-containing wastewater also has a serious impact on aquatic organisms. The toxicity of phenol can greatly inhibi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04C02F101/34
Inventor 罗坚陈明玉杨智王磊
Owner TIANJIN BINHUAN CHEM ENG TECH RES INST
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