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Method for treating chemical excess sludge

A technology for chemical surplus sludge and treatment methods, applied in sludge treatment, water/sludge/sewage treatment, oxidation treatment of sludge, etc., can solve the problems of low treatment efficiency, high cost, large investment, etc., and achieve high-efficiency decontamination Toxic dehydration, enhanced dehydration performance, and efficient synchronous effects

Inactive Publication Date: 2019-10-08
南京工大环境科技南通有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The main disadvantages of this method are: (1) the H involved 2 SO 4 and H 2 o 2 The cost of other agents is high; (2) there are safety hazards in the reaction; (3) the processing efficiency is low
The main disadvantages of this method are: (1) the ozone generator equipment is huge; (2) the energy consumption per unit of ozone is high, and industrial application is relatively difficult
Thermal drying of sludge can greatly reduce the volume of sludge, but the initial investment and operating costs are too high
The wet oxidation method must be operated under high temperature and high pressure conditions, with high energy consumption and large investment, making it difficult to achieve large-scale

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] A method for treating excess chemical sludge, the specific operation steps are as follows:

[0029] Step 1, oxidation treatment: Add 1.5mL of hydrogen peroxide with a mass concentration of 17% to 500mL of chemical sludge with a water content of 93wt.%, and stir until uniform at a stirring speed of 225r / min. The reaction time is 17min. to obtain an oxidation mixture;

[0030] Step 2, ultrasonic treatment: perform ultrasonic treatment on the oxidized mixture obtained in step S1 to obtain cracked sludge, the ultrasonic vibration frequency used in the ultrasonic treatment is 110KHz, and the ultrasonic sound energy density used in the ultrasonic treatment is 0.5W / mL , the action time of the ultrasonic wave is 40min.

[0031] Step 3, adjust the PH value: add the Ca(OH) of 0.13mol / L to the cracked sludge prepared in S2 2 , stirred for 15 minutes, adjusted the pH value to 7.5, left to cool to 25°C after the reaction stopped, and obtained the sludge mixture;

[0032] Step 4, ...

Embodiment 2

[0034] A method for treating excess chemical sludge, the specific operation steps are as follows:

[0035] Step 1, oxidation treatment: Add 2mL of hydrogen peroxide with a mass concentration of 20% to 500mL of chemical sludge with a water content of 90wt.%, and stir until uniform at a stirring speed of 200r / min, and the reaction time is 15min to obtain oxidizing mixture;

[0036]Step 2, ultrasonic treatment: perform ultrasonic treatment on the oxidized mixture obtained in step S1 to obtain cracked sludge, the ultrasonic vibration frequency used in the ultrasonic treatment is 100KHz, and the ultrasonic sound energy density used in the ultrasonic treatment is 0.5W / mL , the action time of the ultrasonic wave is 40min.

[0037] Step 3, adjust the PH value: add the Ca(OH) of 0.13mol / L to the cracked sludge prepared in S2 2 , stirred for 20 minutes, adjusted the pH value to 7.5, left to cool to 25°C after the reaction stopped, and obtained the sludge mixture;

[0038] Step 4, deh...

Embodiment 3

[0040] A method for treating excess chemical sludge, the specific operation steps are as follows:

[0041] Step 1, oxidation treatment: Add 1mL of hydrogen peroxide with a mass concentration of 15% to 500mL of chemical sludge with a water content of 95wt.%, and stir until uniform at a stirring speed of 250r / min, and the reaction time is 18min, to obtain oxidizing mixture;

[0042] Step 2, ultrasonic treatment: perform ultrasonic treatment on the oxidized mixture obtained in step S1 to obtain cracked sludge, the ultrasonic vibration frequency used in the ultrasonic treatment is 120KHz, and the ultrasonic sound energy density used in the ultrasonic treatment is 0.5W / mL , the action time of the ultrasonic wave is 40min.

[0043] Step 3, adjust the PH value: add the Ca(OH) of 0.13mol / L to the cracked sludge prepared in S2 2 , stirred for 20 minutes, adjusted the pH value to 7.5, left to cool to 25°C after the reaction stopped, and obtained the sludge mixture;

[0044] Step 4, d...

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PUM

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Abstract

The invention provides a method for treating chemical excess sludge. The method is technically characterized by including adding hydrogen peroxide into the chemical sludge for oxidation treatment, then mechanically stirring the chemical sludge treated by hydrogen peroxide, then preforming ultrasonic treatment on the mechanically-stirred chemical sludge, adding calcium hydroxide powder into the chemical sludge subjected to ultrasonic treatment for treatment, then allowing the treated chemical sludge to stand, and removing the excess sludge after centrifugation to obtain a supernatant. The treatment method realizes low energy consumption, low cost and high-efficiency simultaneous detoxification and dehydration of chemical excess sludge, so that the water content of the chemical excess sludgeis reduced from 95% to below 75%, and the bio-toxicity EC50 value reaches more than 90%.

Description

technical field [0001] The invention belongs to the field of chemical plant sewage treatment, and in particular relates to a treatment method for chemical surplus sludge. Background technique [0002] Chemical industry is an important pillar industry of our country, which has played an important role in the take-off of our country's economy. However, the chemical industry has a lot of pollution, especially the excess sludge produced in the process of chemical wastewater treatment, which is not only large in amount, but also highly toxic. The output of sludge accounts for about 0.3%~0.5% of the total treated water. If the wastewater is further treated, the amount of sludge may increase by 0.5~1.0 times. Because it is a concentrated substance for sewage treatment, to some extent, its hazards are more serious and hidden than sewage. According to statistics, there are thousands of large and small chemical industry parks in my country, and many chemical companies produce tens of...

Claims

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Application Information

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IPC IPC(8): C02F11/00C02F11/06C02F11/143
CPCC02F11/00C02F11/004C02F11/06C02F11/143
Inventor 王朋史裕森张俊鹏李一岑徐浩
Owner 南京工大环境科技南通有限公司
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