Method for treating excess activated sludge by using ultrasonic wave and Fenton reaction

A technology of excess sludge and Fenton reaction, which is applied in the direction of oxidation treatment of sludge, chemical instruments and methods, sludge treatment, etc., can solve the problems of energy waste and limited application, and achieve the improvement of treatment efficiency, cost saving, and obvious social and economical effects

Inactive Publication Date: 2018-09-07
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] Using ultrasonic or ozone to pretreat sludge and carry out sludge reflux aeration digestion has the characteristics of simple process and easy transformation, and has attracted widespread attention. However, during the process of sludge reflux aeration digestion, COD is degraded and the remaining sludge will be regenerated. , causing energy waste to a certain extent, which limits its further application

Method used

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  • Method for treating excess activated sludge by using ultrasonic wave and Fenton reaction
  • Method for treating excess activated sludge by using ultrasonic wave and Fenton reaction
  • Method for treating excess activated sludge by using ultrasonic wave and Fenton reaction

Examples

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Effect test

Embodiment 1

[0054] For the residual sludge of a certain enterprise, the MLSS is 7300mg / L, the COD contained in the sewage is 240mg / L, and the pH is 7.2. The treatment steps are as follows:

[0055] Step 1: Ultrasonic pretreatment of excess sludge, ultrasonic treatment of excess sludge, ultrasonic intensity 0.3W / mL, ultrasonic time 10min;

[0056] Step 2: Fenton oxidation, the remaining sludge after the above pretreatment enters the Fenton oxidation reaction tank, adds hydrochloric acid, adjusts the pH to 3.5, and the added ferrous ion concentration is 20mg / L and H 2 o 2 The concentration is 3000mg / L, and the reaction is 2h under magnetic stirring at 100rpm;

[0057] Step 3: Neutralize, add KOH to the remaining sludge after Fenton oxidation treatment, adjust the pH to 6, and it is determined that the COD in the remaining sludge is 4300mg / L at this time;

[0058] Step 4: Denitrification and denitrification digestion, the remaining sludge after neutralization is returned to the denitrifica...

Embodiment 2

[0061] For the residual sludge of a certain enterprise, the MLSS is 9200mg / L, the COD contained in the sewage is 430mg / L, and the pH is 8.1. The treatment steps are as follows:

[0062] Step 1: Ultrasonic pretreatment of excess sludge, ultrasonic treatment of excess sludge, ultrasonic intensity 0.6W / mL, ultrasonic time 20min;

[0063] Step 2: Fenton oxidation, the remaining sludge after the above pretreatment enters the Fenton oxidation reaction tank, adds hydrochloric acid, adjusts the pH to 4, and the added ferrous ion concentration is 30mg / L and H 2 o 2 The concentration is 5000mg / L, and the reaction is 3h under 100rpm magnetic stirring;

[0064] Step 3: Neutralize, add NaOH to the remaining sludge after Fenton oxidation treatment, adjust the pH to 7, and it is determined that the COD in the remaining sludge is 6300mg / L at this time;

[0065] Step 4: Denitrification and denitrification digestion, the remaining sludge after neutralization is returned to the denitrification...

Embodiment 3

[0068] For the residual sludge of a certain enterprise, the MLSS is 8400mg / L, the COD contained in the sewage is 350mg / L, and the pH is 7.5. The treatment steps are as follows:

[0069] Step 1: Ultrasonic pretreatment of excess sludge, ultrasonic treatment of excess sludge, ultrasonic intensity 0.4W / mL, ultrasonic time 16min;

[0070] Step 2: Fenton oxidation, the remaining sludge after the above pretreatment enters the Fenton oxidation reaction tank, and hydrochloric acid is added to adjust the pH to 3.7, and the added ferrous ion concentration is 25mg / L and H 2 o 2 The concentration is 4000mg / L, and the reaction is 2.5h under 100rpm magnetic stirring;

[0071] Step 3: Neutralize, add NaOH to the remaining sludge after Fenton oxidation treatment, adjust the pH to 6.5, and it is determined that the COD in the remaining sludge is 4900mg / L at this time;

[0072] Step 4: Denitrification and denitrification digestion, the remaining sludge after neutralization is returned to the ...

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Abstract

The invention relates to a method for treating excess activated sludge by using ultrasonic wave and Fenton reaction, particularly to treatment of excess activated sludge by combining ultrasonic pretreatment of excess activated sludge, Fenton oxidation and denitrification denitrogenation digestion. According to the present invention, the excess activated sludge is effectively dispersed and crackedthrough ultrasonic waves to reduce the particle size of the excess activated sludge, such that the specific surface area of the excess activated sludge is increased so as to improves the reaction efficiency during the Fenton oxidation of the excess activated sludge; the free radical strong oxidation group generated through the Fenton oxidation reacts fully with the cracked excess activated sludge,such that the excess activated sludge is digested, and the lysis of the excess activated sludge can be promoted; the excess activated sludge after the Fenton oxidation returns to the denitrificationpool, and can be used as the feeding carbon source during the denitrification so as to reduce the denitrification; and the method has characteristics of stable treatment effect, high reaction efficiency, full utilization of resources, easy industrialization, and the like.

Description

technical field [0001] The invention relates to a treatment technology for industrial excess sludge, in particular to a method for treating industrial excess sludge by using the process of "ultrasonic pretreatment of excess sludge + Fenton oxidation + denitrification and denitrification and digestion". Background technique [0002] Excess sludge is a colloidal floc produced in the process of wastewater treatment, which contains microorganisms, parasite eggs, heavy metals and other toxic and harmful substances, and is an important harmful by-product. A large amount of excess sludge is produced in my country's industrial sewage treatment plants, and most of them are treated as hazardous waste outsourced (about 2,000 yuan / ton), which increases the cost of enterprise operation. [0003] Common surplus sludge treatment processes include landfill, incineration, filter press, and dehydration. Harmful substances in the sludge will diffuse during landfill and cause secondary pollutio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F11/00C02F11/06
CPCC02F11/00C02F11/06
Inventor 邱松李昕阳魏令勇杨芳芳
Owner CHINA PETROLEUM & CHEM CORP
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