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Method for treating sludge by use of polyaluminum chloride and ultrasonic combining technology

A technology of polyaluminum chloride and combined use technology, which is applied in the field of sludge treatment with polyaluminum chloride and ultrasonic combined use technology, can solve the problem of weak improvement of sludge performance, secondary pollution, and incomplete solution of bound water. And other issues

Inactive Publication Date: 2015-09-09
ZUNYI NORMAL COLLEGE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Its purpose is to convert the adsorbed water into free water and then release it, and the flocculants used in the follow-up are polyaluminum chloride and cationic polyacrylamide with a molecular weight of 12-15 million, through electrical neutralization, adsorption, bridging and The effect of net flutter causes the sludge fragments to flocculate and reduce the adsorbed water of the sludge. However, because the ultrasonic treatment is used first, the adsorbed water in the sludge is detached, thereby increasing the content of free water, and making the polymerized chlorine The input amount of aluminum is relatively large, resulting in Al in water 3+ The concentration is high, which brings the disadvantage of secondary pollution; and, because the above-mentioned process is flocculated after ultrasonic treatment, the bound water in the sludge is not completely resolved, which leads to a weak improvement in sludge performance

Method used

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  • Method for treating sludge by use of polyaluminum chloride and ultrasonic combining technology

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] A kind of polyaluminum chloride and the method for ultrasonic combination technique to sludge treatment, comprise the following steps:

[0017] (1) The pH of the sludge is adjusted with the adjusting solution so that the pH value of the sludge is 9.3, and then the sludge is placed in the stirring tank, and the stirring speed is 1800r / min. Add 400 mg of polyaluminum chloride, and stir at a constant speed for 20 minutes;

[0018] (2) Stop stirring the sludge after the stirring reaction in step (1), let it stand for 20 minutes, then send it to an ultrasonic processor, adjust the temperature to 20°C for 8 minutes, and then send it to a centrifugal dehydrator The centrifugal dehydration treatment in the middle can improve the dewatering performance of the sludge.

[0019] The regulating solution is sodium hydroxide solution with a concentration of 0.7mol / L.

[0020] In the ultrasonic processor, the frequency of the ultrasonic wave is 50kHz.

[0021] Described centrifugal ...

Embodiment 2

[0023] A kind of polyaluminum chloride and the method for ultrasonic combination technique to sludge treatment, comprise the following steps:

[0024] (1) The pH of the sludge is adjusted with the adjusting solution so that the pH value of the sludge is 11, and then the sludge is placed in the stirring tank, and the stirring speed is 2000r / min. Add 500 mg of polyaluminum chloride, and stir at a constant speed for 30 minutes;

[0025] (2) Stop stirring the sludge after the stirring reaction in step (1), let it stand for 30 minutes, then send it to an ultrasonic processor, adjust the temperature to 25°C for 10 minutes, and then send it to a centrifugal dehydrator The centrifugal dehydration treatment in the middle can improve the dewatering performance of the sludge. The regulating solution is sodium hydroxide solution with a concentration of 1mol / L.

[0026] In the ultrasonic processor, the frequency of the ultrasonic wave is 70kHz.

[0027] Described centrifugal dehydrator,...

Embodiment 3

[0029] A kind of polyaluminum chloride and the method for ultrasonic combination technique to sludge treatment, comprise the following steps:

[0030] (1) The pH of the sludge is adjusted with the adjusting solution so that the pH value of the sludge is 8, and then the sludge is placed in the stirring tank, and the stirring speed is 1500r / min. Add 300mg of polyaluminum chloride, and stir at a constant speed for 15 minutes;

[0031] (2) Stop stirring the sludge after the stirring reaction in step (1), let it stand for 15 minutes, then send it to an ultrasonic processor, adjust the temperature to 15°C for 5 minutes, and then send it to a centrifugal dehydrator The centrifugal dehydration treatment in the middle can improve the dewatering performance of the sludge. The regulating solution is sodium hydroxide solution with a concentration of 0.1mol / L.

[0032] In the ultrasonic processor, the frequency of the ultrasonic wave is 30kHz.

[0033] Described centrifugal dehydrator, it...

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Abstract

The invention relates to the technical field of sludge dehydration property improvement and particularly relates to a method for treating sludge by use of a polyaluminum chloride and ultrasonic combining technology. The method comprises the following steps: adjusting the pH value by use of sodium hydroxide, adding polyaluminum chloride and stirring uniformly with a stirrer; treating for 5-10min with a frequency of 26-70kHz; and performing centrifugal filtration treatment with a centrifuge. By adopting the method, the dehydration property of sludge is improved, and the sludge storage capacity is reduced; and moreover, the energy consumption of treatment is relatively low, the removal rate of water is not less than 38.7%, the water content of sludge is reduced to be not higher than 60%, and the sludge dehydration property is improved by 5-9% over the traditional sludge dehydration property.

Description

technical field [0001] The invention relates to the technical field of improving sludge dewatering performance, in particular to a method for treating sludge by combining polyaluminum chloride and ultrasonic technology. Background technique [0002] In recent years, my country's urbanization level and people's living standards have been continuously improved with the rapid development of the economy. The discharge of urban industrial wastewater and domestic sewage is increasing, and the increase in sewage treatment will inevitably produce more sludge. Further treatment of sludge has become an important issue in today's environment. After physical, biological and chemical treatment, the wastewater is finally separated from the water body in the form of primary sludge, biochemical sludge and chemical sludge. Large, this type of sludge production will continue to increase rapidly. [0003] Sludge particles are negatively charged and form a stable colloidal suspension with the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F11/14C02F11/12
Inventor 伍远辉罗宿星巫受群翟飞卯明飞
Owner ZUNYI NORMAL COLLEGE
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