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A method for evaluating the performance of electroosmotic deep dewatering of excess sludge

A technology for deep dehydration and excess sludge, applied in dehydration/drying/thickening sludge treatment, weighing by removing certain components, etc., can solve problems such as heavy workload and inability to guarantee electroosmotic dehydration performance of excess sludge , to achieve the effects of simple estimation, reduced experimental workload, and reduced complexity

Active Publication Date: 2019-09-10
NANJING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to overcome the blindness of sludge modification in the prior art, the workload is large, and the electroosmotic dehydration performance of the modified residual sludge cannot be guaranteed, and a kind of residual sludge is provided. Evaluation method of deep dehydration performance by electroosmosis

Method used

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  • A method for evaluating the performance of electroosmotic deep dewatering of excess sludge
  • A method for evaluating the performance of electroosmotic deep dewatering of excess sludge
  • A method for evaluating the performance of electroosmotic deep dewatering of excess sludge

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Embodiment 1

[0076] A kind of evaluation method of electroosmosis deep dewatering performance of excess sludge in this embodiment, such as figure 1 As shown, the specific steps are as follows:

[0077] S1: Collect remaining sludge samples and measure their IMC: Weigh 10g of sludge in a crucible, dry it in an oven at 105°C for 24 hours, then cool and weigh it, and measure IMC=81.80%.

[0078] S2: EC measurement: Add 25 mL of deionized water to 10 g of sludge sample, stir vigorously with a glass rod for 1-2 min, and after standing for 30 min, use a conductivity meter to measure the conductivity of the sludge supernatant to 1271 μs / cm.

[0079] S3: Z measurement: add 50mL deionized water to 0.5g sludge sample to make a suspension solution, and use HCl, NaOH solution to adjust the pH of the suspension, and KCl solution to adjust the conductivity of the suspension to make it the same as the original sludge , and then measured with a zeta potentiometer, the measured Z=-14.4mV.

[0080] S4: EPS...

Embodiment 2

[0084] A kind of evaluation method of electroosmosis deep dewatering performance of excess sludge in this embodiment, such as figure 1 As shown, the specific steps are as follows:

[0085] S1: Collect remaining sludge samples, and measure IMC: Weigh 10 g of sludge in a crucible, dry it in an oven at 105°C for 24 hours, then cool and weigh it, and measure IMC=80.90%.

[0086] S2: EC measurement: Add 25 mL of deionized water to 10 g of sludge sample, stir vigorously with a glass rod for 1-2 min, and after standing for 30 min, use a conductivity meter to measure the conductivity of the sludge supernatant to 1469 μs / cm.

[0087] S3: Z measurement: add 50mL deionized water to 0.5g sludge sample to make a suspension solution, and use HCl, NaOH solution to adjust the pH of the suspension, and KCl solution to adjust the conductivity of the suspension to make it the same as the original sludge , and then measured with a zeta potentiometer, the measured Z=-16.7mV.

[0088] S4: EPS mea...

Embodiment 3

[0092] A method for evaluating the performance of excess sludge electroosmosis deep dehydration in this embodiment, such as figure 1 As shown, the specific steps are as follows:

[0093] S1: Collect remaining sludge samples and measure IMC: Weigh 10 g of sludge in a crucible, dry it in an oven at 105°C for 24 hours, then cool and weigh it, and measure IMC=84.60%.

[0094] S2: EC measurement: Add 25 mL of deionized water to 10 g of sludge sample, stir vigorously with a glass rod for 1-2 min, and after standing for 30 min, use a conductivity meter to measure the conductivity of the sludge supernatant to 1138 μs / cm.

[0095] S3: Z measurement: add 50mL deionized water to 0.5g sludge sample to make a suspension solution, and use HCl, NaOH solution to adjust the pH of the suspension, and KCl solution to adjust the conductivity of the suspension to make it the same as the original sludge , and then measured with a zeta potentiometer, the measured Z=-18mV.

[0096] S4: EPS measurem...

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Abstract

The invention discloses an evaluation method of excess sludge electroosmosis deep dehydration performance, belonging to the technical fields of sewage treatment and solid waste treatment. The method comprises the steps of firstly, collecting a biological sludge sample, and measuring the initial moisture content (IMC), volatile solids (VSS), electrical conductivity (EC), pH value, zeta potential and extracellular polymeric substance (EPS) content of the sludge sample before electroosmosis dehydration is carried out; screening out the key indexes, i.e., EC, Z and EPS, which affect the electroosmosis deep dehydration performance, by using a Group Lasso model; establishing a regression equation based on the key indexes, and calculating according to the regression equation so as to obtain sludge moisture content (FMC) and dehydration rate (DR) after the electroosmosis dehydration is finished. The evaluation method can quantify a complex relationship between residual sludge properties and electroosmosis deep dehydration performance so as to obtain a better prediction result; the result is high in conformity with measured data of the FMC and the DR which are obtained after the electroosmosis dehydration of a simulation device is finished, so that the test work load is greatly reduced, and basis data is provided for further sludge modification.

Description

technical field [0001] The invention relates to a sludge dewatering process, and more specifically relates to a method for evaluating the electroosmotic deep dehydration performance of surplus sludge, belonging to the technical fields of sewage treatment and solid waste treatment. Background technique [0002] With the continuous improvement of the level of urbanization, the capacity of sewage treatment has been further strengthened. During the operation of the sewage plant, a large amount of excess sludge is produced, which brings great pressure to the environment. The properties of sludge are extremely complex, especially the remaining activated sludge discharged from the secondary settling tank of domestic sewage plant, which is hydrophilic and fine-grained organic sludge, with poor compressibility and poor dehydration performance. At the same time, the sludge contains a large number of pathogenic microorganisms, parasite eggs, malodorous substances and heavy metal ions....

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F11/13C02F11/15G01N5/04
Inventor 张宴白皓朱荣任洪强
Owner NANJING UNIV
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