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Sludge dewatering method by combining iron-carbon micro-electrolysis and Fenton method

A technology of iron-carbon micro-electrolysis and sludge dewatering, which is applied in the oxidation treatment of sludge, dehydration/drying/concentrated sludge treatment, etc., to achieve the effects of reducing dosage, improving dehydration performance, and improving the efficiency of micro-electrolysis reaction.

Inactive Publication Date: 2019-12-06
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the traditional Fenton method has the disadvantage of requiring a la

Method used

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  • Sludge dewatering method by combining iron-carbon micro-electrolysis and Fenton method
  • Sludge dewatering method by combining iron-carbon micro-electrolysis and Fenton method
  • Sludge dewatering method by combining iron-carbon micro-electrolysis and Fenton method

Examples

Experimental program
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Example Embodiment

[0039] Example 1

[0040] (1) Pretreatment of activated carbon: soak the activated carbon in the sludge sample for 24 hours to reach the adsorption saturation state, and then air-dry the activated carbon naturally at room temperature for use;

[0041] (2) Take 200 mL of sludge and place it in a beaker, use 10% dilute sulfuric acid and 10% dilute sodium hydroxide to adjust the pH to 2, 2.5, 3, 3.5, 4, 4.5, respectively.

[0042] (3) Add iron powder and activated carbon to the sludge treated in step (2) above. Based on the sludge addition amount, the iron powder addition amount is 4g / L, and the Fe / C mass ratio is controlled to 1:1. The aeration rate is 1.5L / min, and the iron-carbon micro-electrolysis reaction is carried out for 30 minutes.

[0043] (4) Measure the water content of the sludge after the treatment in the above step (3), in order to explore the effect of the pH value of the iron powder on the dewatering performance of the sludge when the iron-carbon micro-electrolysis is pe...

Example Embodiment

[0045] Example 2

[0046] (1) Pretreatment of activated carbon: soak the activated carbon in the sludge sample for 24 hours to reach the adsorption saturation state, and then air-dry the activated carbon naturally at room temperature for use;

[0047] (2) Take 200 mL of sludge and place it in a beaker, and adjust the pH to 3 with 10% dilute sulfuric acid and 10% dilute sodium hydroxide.

[0048] (3) Add iron powder and activated carbon to the sludge treated in step (2) above, based on the amount of sludge added, the amount of iron powder added is 4g / L, and the Fe / C mass ratio is controlled to 1:1 , Respectively control the reaction time to 15min, 30min, 45min, 60min, 75min, 90min, and the aeration rate to 1.5L / min.

[0049] (4) Measure the water content of the sludge after treatment in the above step (3), in order to explore the effect of the reaction time on the degree of sludge cracking and the sludge dewatering performance in the single iron-carbon microelectrolysis.

[0050] by fi...

Example Embodiment

[0051] Example 3

[0052] (1) Pretreatment of activated carbon: soak the activated carbon in the sludge sample for 24 hours to reach the adsorption saturation state, and then air-dry the activated carbon naturally at room temperature for use.

[0053] (2) The sludge was refrigerated at 4°C, and then naturally settled for 24 hours. The supernatant was poured to obtain the settled sludge; 200mL of the settled sludge was placed in a beaker, and 10% dilute sulfuric acid and 10 % Dilute sodium hydroxide adjusts the pH to 2.5.

[0054] (3) Add different amounts of iron powder (0.3g / L, 0.6g / L, 0.9g / L, 1.2g / L, 1.5g / L, 1.8g / L) to the sludge treated in step (2) above. L) and activated carbon, in which the mass ratio of Fe / C is 1:1, the aeration rate is 1.5 L / min, and the micro-electrolysis reaction is performed for 30 minutes.

[0055] (4) Add 3.0g / L of H to the above step (3) 2 O 2 , The rotation speed is 300r / min, and the Fenton reaction is performed for 60 minutes.

[0056] (5) Determine the...

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Abstract

The invention discloses a sludge dewatering method by combining iron-carbon micro-electrolysis and a Fenton method. The method comprises the following steps of (1) carrying out pretreating on activated carbon; (2) adjusting the pH value of the sludge to 2-3 to obtain acidic sludge; (3) adding iron powder and activated carbon into the acidic sludge, uniformly stirring, and carrying out micro-electrolysis reaction; and (4) then adding H2O2, uniformly stirring, and carrying out Fenton reaction. Iron-carbon micro-electrolysis and the Fenton method are combined for sludge dewatering, and compared with other methods, the sludge dewatering efficiency is better improved; and proper micro-electrolysis treatment is beneficial to sludge cracking, and the Fe<2+> generated after micro-electrolysis reaction and the added H2O2 are utilized to form a Fenton reagent, so that the consumption of iron powder is reduced, the sludge floc and the EPS structure are more effectively destroyed, and the dewatering performance is improved. The method has the advantages of being high in treatment effect, low in cost, beneficial to sludge cracking and the like.

Description

technical field [0001] The invention belongs to the technical field of sludge treatment, in particular to a method for dewatering sludge by combining iron-carbon micro-electrolysis and a Fenton method. Background technique [0002] With the continuous improvement of my country's urbanization level, sewage treatment facilities and treatment methods are constantly being improved and updated. By the end of 2016, a total of 2,039 sewage treatment plants had been built in all cities across the country, with a daily treatment capacity of 149 million m 3 , It has made a great contribution to my country's realization of emission reduction goals and completion of pollution control work. However, with the completion and operation of the sewage treatment plant, there will be a large amount of excess sludge produced. Based on a water content of 80%, the total annual national sludge production will exceed 35 million tons. It is estimated that by 2020, the total sludge production will be ...

Claims

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Application Information

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IPC IPC(8): C02F11/06C02F11/15
CPCC02F11/06C02F11/15
Inventor 丁绍兰赵振田倩倩
Owner SHAANXI UNIV OF SCI & TECH
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