An online evaluation method for sludge dewatering performance

A sludge dehydration and evaluation method technology, applied in water/sludge/sewage treatment, sludge treatment, sludge oxidation treatment, etc., can solve the problems of cumbersome testing, difficult online testing, and limited application, and achieve real-time online Evaluate, facilitate the effect of standardization

Active Publication Date: 2022-07-29
BEIJING FORESTRY UNIVERSITY
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  • Description
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Problems solved by technology

However, these methods all have the problem of cumbersome testing in the actual process, and online testing also has certain difficulties
This limits the application of these methods in practical engineering

Method used

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  • An online evaluation method for sludge dewatering performance
  • An online evaluation method for sludge dewatering performance
  • An online evaluation method for sludge dewatering performance

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] The remaining activated sludge was taken from the anaerobic / aerobic biological reaction process with a daily water treatment capacity of 1 million tons in a reclaimed water plant in Beijing, and the sludge concentration was 18g / L. Different doses of FeCl were added to the sludge 3 coagulant to obtain sludge with different dewatering properties. The sludge was subjected to a frequency sweep test with an electrochemical impedance meter connected with a conductivity electrode, and the test procedure was the same as that described in the specific embodiment. income d s / f c The relationship with the traditional indicators CST and SRF for evaluating sludge dewatering performance is as follows Figure 4 shown. attached by Figure 4 It is known that d s / f c It has a significant linear relationship with the traditional offline indicators CST and SRF, which feedback sludge dewatering performance, and the linear fitting R 2 All are greater than 0.94, and p-values ​​are a...

Embodiment 2

[0049] Take the same surplus activated sludge as in Example 1 as the original sludge for conditioning. Different from Example 1, Example 2 adopts the conditioning method of oxidative cracking and reflocculation, that is, using different doses of potassium permanganate to The sludge was oxidized and decomposed, and then the oxidation was terminated with ferrous chloride with a molar ratio of 3 times potassium permanganate, and ferric iron was formed in situ for flocculation. The frequency sweep test was performed on sludge with different dosages of conditioners, and the test process was the same as that described in the specific embodiment. income d s / f c The relationship with the traditional indicators CST and SRF for evaluating sludge dewatering performance is as follows Figure 5 shown. attached by Figure 5 It is known that d s / f c There is also a significant linear relationship with the traditional offline indicators CST and SRF, which feedback sludge dewatering pe...

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Abstract

The invention discloses an on-line evaluation method for sludge dewatering performance, belonging to the technical field of environmental protection and aiming at solving the problems that the existing method cannot meet the needs of on-line evaluation of sludge dewatering performance. The invention uses an electrochemical impedance meter connected with a conductivity electrode to perform a real-time frequency scan on the sludge, and compares the water release process in the sludge floc with the movement process of the charge in the floc during impedance testing. The movement process in the floc is affected by the similarity of the floc structure resistance and viscous resistance. The spectral dimension d to describe the charge movement trajectory at the unit floc scale is proposed. s / f c as a parameter to characterize sludge dewatering performance. Compared with the existing method, the present invention does not need to perform special treatment on the sample during the test, and only inserts the electrode probe into the sludge suspension for frequency scanning, which can realize the real-time online evaluation of the sludge dewatering performance, and is beneficial to the sludge dewatering. Standardization of the performance evaluation process.

Description

[0001] Technical field [0002] The invention relates to an on-line evaluation method of sludge dewatering performance, which belongs to the technical field of environmental protection. Background technique [0003] With the rapid development of my country's economy and the continuous deepening of the urbanization process, the discharge of municipal sludge is increasing day by day. According to the yearbook statistics of the Ministry of Housing and Urban-Rural Development, since 2008, my country's sludge production has increased at an annual rate of 10.7%. As of the end of 2019, the amount of wet sludge produced by sewage treatment plants reached 55.1365 million tons. At the same time, the higher water content makes the sludge larger, which causes a series of difficulties in transportation, treatment, disposal, etc., and the disposal cost of sludge remains high. Therefore, the dehydration of municipal excess sludge is particularly necessary. In order to release the water con...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F11/06C02F11/143G06K9/62G06Q10/06
CPCC02F11/143C02F11/06G06Q10/0639G06F18/22
Inventor 王毅力张达鑫赵晓琦
Owner BEIJING FORESTRY UNIVERSITY
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