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: 2021-11-09
BEIJING FORESTRY UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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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  • Online evaluation method for sludge dewatering performance
  • Online evaluation method for sludge dewatering performance
  • Online evaluation method for sludge dewatering performance

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] The remaining activated sludge was taken from an 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. Add different doses of FeCl to the sludge 3 coagulant to obtain sludge with different dewatering properties. An electrochemical impedance meter connected to a conductivity electrode is used to perform a frequency sweep test on the sludge, and the test process is consistent with 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 shown in the attached Figure 4 shown. attached by Figure 4 It can be seen that d s / f c There is a significant linear relationship with the traditional off-line indicators CST and SRF that feedback the sludge dewatering performance, and the linear fitting R 2 are all greater than 0.94, and the p-...

Embodiment 2

[0049] Get the same remaining activated sludge as the original sludge in Example 1 for conditioning, and the difference from Example 1 is that Example 2 adopts the conditioning method of oxidative cracking-reflocculation, that is, potassium permanganate with different doses 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 generated in situ for flocculation. The sludge with different dosages of conditioning agents was subjected to a frequency sweep test, and the test process was consistent with 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 shown in the attached Figure 5 shown. attached by Figure 5 It can be seen that d s / f c There is also a significant linear relationship with the traditional off-line indicators CST and SRF th...

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Abstract

The invention discloses an online evaluation method for sludge dewatering performance, belongs to the technical field of environmental protection, and aims to solve the problem that an existing method is difficult to meet online evaluation requirements of the sludge dewatering performance and the like. The method comprises the following steps of: performing real-time frequency scanning on sludge by utilizing an electrochemical impedance instrument connected with a conductivity electrode, comparing a water release process in sludge floc with a movement process of charges in the floc during impedance test, utilizing the similarity of floc structure resistance and viscous resistance of water and charges in the movement process of the floc, putting the spectrum dimension ds / fc for describing the movement track of the charges under the scale of the unit floc forward as a parameter for representing the dewatering performance of the sludge. Compared with the prior art, the method has the advantages that a sample does not need to be specially treated during testing, the electrode probe is inserted into the sludge suspension for frequency scanning, real-time online evaluation of the sludge dewatering performance can be achieved, and standardization of the sludge dewatering performance evaluation process is facilitated.

Description

[0001] Technical field [0002] The invention relates to an online evaluation method for 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 urbanization, the discharge of municipal sludge is increasing day by day. According to the statistics of the Yearbook of the Ministry of Housing and Urban-Rural Development, since 2008, my country's sludge production has grown 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 volume larger, causing a series of difficulties in transportation, treatment, and disposal, and the cost of sludge disposal has remained high. Therefore, the dehydration reduction of municipal surplus sludge is particularly necessary. In order to release the mo...

Claims

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Application Information

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Patent Type & Authority Applications(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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