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Method for efficiently and fast treating high-content arsenic in surplus sludge

A technology with excess sludge and high content, which is applied in the oxidation treatment of sludge, sludge treatment, chemical instruments and methods, etc. Simple to use effects

Inactive Publication Date: 2012-10-03
RENMIN UNIVERSITY OF CHINA
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  • Summary
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  • Application Information

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Problems solved by technology

[0005] In order to solve the problem that a large amount of heavy metals exist in sludge, especially the high arsenic content and high toxicity in sludge, which affect its resource utilization and easily cause secondary environmental pollution, the present invention provides a method for quickly and efficiently treating high-content sludge in sludge by using low-frequency ultrasonic waves. arsenic method

Method used

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  • Method for efficiently and fast treating high-content arsenic in surplus sludge

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specific Embodiment approach 1

[0013] Embodiment 1: The method for rapid and efficient ultrasonic treatment of high-content arsenic in sludge is carried out in the following steps: the residual sludge after secondary treatment of sewage is irradiated by an ultrasonic irradiation device.

[0014] The ultrasonic irradiation device in this embodiment is a commercial device.

specific Embodiment approach 2

[0015] Embodiment 2: This embodiment differs from Embodiment 1 in that: the ultrasonic irradiation device is a low-frequency ultrasonic irradiation device with a frequency of 20-100 KHz. Others are the same as in the first embodiment.

specific Embodiment approach 3

[0016] Embodiment 3: This embodiment differs from Embodiments 1 to 2 in that: the ultrasonic irradiation device is a low-frequency ultrasonic irradiation device, and the sound energy density ranges from 0.1 to 1.8 W / ml. Others are the same as the specific embodiment 1 to 2.

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Abstract

The invention relates to a method for efficiently and fast treating high-content arsenic in surplus sludge, belonging to the technical field of sludge treatment. With the adoption of the method, low-frequency ultrasonic wave is utilized to treat the surplus sludge and the high-content arsenic in the municipal sludge is stabilized by fully utilizing powerful shake waves generated by the cavatition of the ultrasonic wave, strong oxidant and high-temperature hot spot effect. The used low-frequency ultrasonic radiation device is a commercial device with frequency within 20-100KHz and sound energy density within 0.1-1.8w / ml. The retention time of the sludge is 1-30min. The method efficiently and fast treating the high-content arsenic in the surplus sludge has the characteristics of simple operation, convenient management, rapidness and high efficiency; stabilization rate of the high-content arsenic in the sludge can reach over 95%. The content of arsenic existing in a substitutable state, a combination state of carbonates and a oxidization state by iron and manganese in the treated sludge is remarkably reduced. The method is widely applied to treatment of the arsenic in the municipal sludge. The sludge treated by the method is widely applied to agriculture, garden green lands and roof greening, and is beneficial to full utilization of sludge resource, slowing or elimination of secondary pollution caused by the utilization of the sludge.

Description

technical field [0001] The invention relates to a method for treating high-content arsenic in municipal sludge. Background technique [0002] With the acceleration of urbanization and industrialization, more and more sewage needs to be treated. Due to the large proportion of industrial wastewater in my country's urban sewage, the heavy metal content in sewage is relatively high. In the process of sewage treatment, heavy metals cannot be degraded and removed. After secondary treatment, a considerable part of heavy metals is transferred to sludge. On the one hand, it increases the difficulty of sludge treatment and disposal, and affects the resource utilization of sludge; on the other hand On the one hand, due to the biological toxicity of most heavy metals, it is easy to cause secondary pollution to soil, groundwater, animals and plants during the process of sludge resource utilization. The pollution caused by heavy metals has the characteristics of concealment, long-term a...

Claims

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Application Information

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IPC IPC(8): C02F11/00C02F11/06C02F101/10
Inventor 张光明万甜张盼月
Owner RENMIN UNIVERSITY OF CHINA
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