Treatment method for rapidly improving settling and dewatering performances of sludge

A treatment method and sludge settlement technology, applied in water/sludge/sewage treatment, sludge treatment, dehydration/drying/thickened sludge treatment, etc., can solve the problems of limited sludge dehydration, excessive chemical dosage, and economical High cost and other issues, to achieve the effect of avoiding secondary environmental pollution, enhancing bridging effect, and improving sludge settlement performance

Inactive Publication Date: 2019-03-15
HUNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This solves the technical problems of the existing advanced oxidation technology, such as the need to adjust the pH of the sludge, the dosage is too large, the economic cost is high, and the degree of dehydration of the sludge is limited by the separate flocculation conditioning, and the rapid sedimentation and high-efficiency dehydration of the sludge are realized.

Method used

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  • Treatment method for rapidly improving settling and dewatering performances of sludge

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Effect test

Embodiment 1

[0029] A treatment method for rapidly improving sludge settling and dewatering performance, comprising the following steps:

[0030] (1) The remaining sludge was taken from a sewage plant in Changsha City, the moisture content of the sludge was 98.2%, and the pH of the sludge was 6.78.

[0031] (2) Adjust the pH of the sludge in step (1) from 6.78 to 6.90.

[0032] (3) At a stirring rate of 210 r / min, add cationic polyacrylamide accounting for 0.025% of the dry weight of the sludge to the sludge in step (2), and stir for 2.5 minutes to obtain mixed sludge.

[0033] (4) At a stirring rate of 210 r / min, continue stirring step (3) and mix the sludge for 2.5 minutes, then measure the dewatering performance of the sludge.

[0034] (5) Transfer the mixed sludge in step (4) to a graduated cylinder, place a magnet at the bottom of the graduated cylinder, and measure the sludge settling performance.

[0035] The dewatering and settling properties of the sludge before and after treatm...

Embodiment 2

[0037] A treatment method for rapidly improving sludge settling and dewatering performance, comprising the following steps:

[0038] (1) The remaining sludge was taken from a sewage plant in Changsha City, the moisture content of the sludge was 98.2%, and the pH of the sludge was 6.78.

[0039] (2) Adjust the pH of the sludge in step (1) from 6.78 to 6.90.

[0040] (3) Stir the sludge in step (1) for 2.5 min at a stirring rate of 210 r / min.

[0041] (4) under the stirring rate of 210r / min, in the sludge of step (3), continue to add and account for the nano iron ferric oxide of 1.37% of sludge dry weight, after stirring 2.5min, obtain the sludge after conditioning, measure Sludge dewatering performance.

[0042] (5) Transfer the conditioned sludge in step (4) to a graduated cylinder, place a magnet at the bottom of the graduated cylinder, and measure the sludge settling performance.

[0043] The dewatering and settling properties of the sludge before and after treatment were...

Embodiment 3

[0045] A treatment method for rapidly improving sludge settling and dewatering performance, comprising the following steps:

[0046] (1) The remaining sludge was taken from a sewage plant in Changsha City, the moisture content of the sludge was 98.2%, and the pH of the sludge was 6.78.

[0047] (2) Adjust the pH of the sludge in step (1) from 6.78 to 6.90.

[0048] (3) At a stirring rate of 210 r / min, add cationic polyacrylamide accounting for 0.025% of the dry weight of the sludge to the sludge in step (2), and stir for 2.5 minutes to obtain mixed sludge.

[0049] (4) under the stirring rate of 210r / min, in the sludge of step (3), continue to add and account for the nano iron ferric oxide of 1.37% of sludge dry weight, after stirring 2.5min, obtain the sludge after conditioning, measure Sludge dewatering performance.

[0050] (5) Transfer the conditioned sludge in step (4) to a graduated cylinder, place a magnet at the bottom of the graduated cylinder, and measure the sludg...

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Abstract

The invention belongs to the technical field of sludge treatment, and specifically relates to a method for rapidly improving the settling and dewatering performances of sludge. The method comprises the following steps: adjusting the sludge water content and pH; mixing sludge and cationic polyacrylamide (PAM), continuously adding nanometer ferroferric oxide (Fe3O4), performing suction filtration dewatering on conditioned sludge, and performing rapid settling under magnetic action. The method cooperatively treats the sludge through charge neutralization and net capturing of polyacrylamide in combination with the adsorption effect of the nanometer ferroferric oxide, can obviously improve the settling and dewatering performances of the sludge, and realizes sludge rapid settling, and the promotion of the method has important environmental ecological significance on sludge treatment and disposal in China.

Description

technical field [0001] The invention relates to the technical field of sludge treatment, in particular to a treatment method for rapidly improving sludge settling and dewatering performance. Background technique [0002] With the progress of urbanization and the surge of population, the volume and rate of sewage treatment have increased, leading to a rapid increase in sludge production. However, due to various reasons such as technology, economy, environment, society and law, 80% of the sludge in sewage treatment plants in my country cannot be properly treated and disposed of, causing serious secondary pollution, and the bottleneck of sludge disposal technology often lies in sewage. The high moisture content of the mud makes it difficult to settle quickly, dehydrate and reduce volume, which brings great pressure to the subsequent disposal process. [0003] Studies have shown that the dewatering performance of sludge is closely related to its extracellular polymer (EPS). EPS...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F11/143C02F11/147C02F11/15
CPCC02F11/121C02F11/14
Inventor 袁兴中黎一夫王冬波陈晓红吴志斌蒋龙波冷立健曾光明
Owner HUNAN UNIV
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