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Method for simultaneously and deeply conditioning and dewatering sludge and recycling and conditioning activating agent

An activator and treatment method technology, applied in sludge treatment, chemical instruments and methods, water/sludge/sewage treatment, etc., can solve high economic cost, large dosage of activator, limited sludge dehydration performance, etc. problems, to achieve the effect of avoiding large dosage, realizing the cost of activator, and improving the sludge dewatering performance

Inactive Publication Date: 2019-03-19
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 of the activator is too large, it cannot be recycled, the economic cost is high, and the single heat treatment can improve the sludge dehydration performance. Agent recycling

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] A method for deep conditioning and dehydration of sludge while recovering a conditioning activator, comprising the following steps:

[0030] (1) The remaining sludge was taken from a sewage plant in Changsha City. After standing for 13 hours, the moisture content of the sludge was 95.9%, and the pH of the sludge was 6.80.

[0031] (2) Adjust the pH of the sludge in step (1) from 6.9 to 6.6.

[0032] (3) Add iron powder accounting for 25% of the dry weight of the sludge to the sludge in step (2) at a stirring rate of 180 r / min, and stir for 3 minutes to obtain a mixture.

[0033] (4) At a stirring rate of 180r / min, continue to add potassium monopersulfate compound salt accounting for 4.8% of the dry weight of the sludge to the sludge in step (3), and stir for 3 minutes to obtain a mixture.

[0034] (5) At a stirring rate of 180 r / min, place the mixed sludge in step (4) in a constant temperature water bath, heat to 53° C. and maintain it for 15 minutes for heat treatment...

Embodiment 2

[0039] A method for deep conditioning and dehydration of sludge while recovering a conditioning activator, comprising the following steps:

[0040] (1) The remaining sludge was taken from a sewage plant in Changsha City. After standing for 13 hours, the moisture content of the sludge was 95.9%, and the pH of the sludge was 6.80.

[0041] (2) Adjust the pH of the sludge in step (1) from 6.9 to 6.5.

[0042] (3) At a stirring rate of 180 r / min, add iron powder accounting for 27% of the dry weight of the sludge to the sludge in step (2), and stir for 3 minutes to obtain a mixture.

[0043] (4) At a stirring rate of 180r / min, continue to add potassium monopersulfate compound salt accounting for 4.7% of the dry weight of the sludge to the sludge in step (3), and stir for 3 minutes to obtain a mixture.

[0044] (5) At a stirring rate of 180 r / min, the mixed sludge in step (4) was placed in a constant temperature water bath, heated to 55° C. and maintained for 15 minutes for heat tr...

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Abstract

The invention belongs to the technical field of sludge treatment, and particularly relates to a method for simultaneously and deeply conditioning and dewatering sludge and recycling and conditioning an activating agent. The treatment method includes the steps: adjusting water content and pH (potential of hydrogen) of sludge; mixing the sludge and zero-valent iron to obtain mixture, continuing to add potassium hydrogen peroxymonosulfate to perform heat treatment of the sludge, performing magnetic separation of the zero-valent iron on the treated sludge to reach recycling of the activating agentand conditioning of the sludge, and dewatering the treated sludge. The reduction rate of specific resistance of the conditioned sludge is 91.1%, water content of filter cakes is reduced to 67.1%, andiron recycling rate reaches 98.3%. According to the method, the sludge is synergistically conditioned through combination of chemical activation and heat activation based on sulfate radical anion, dewatering performance of the sludge can be remarkably improved, the activating agent is recycled, and popularization of the technique has important environmental and ecological significance for national sludge treatment and disposal.

Description

technical field [0001] The invention relates to the technical field of sludge treatment, in particular to a method for deep conditioning and dehydration of sludge while recovering conditioning activators. 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 mud makes it difficult to dehydrate and reduce volume, which brings great pressure to subsequent disposal. [0003] Excess sludge refers to the solid, semi-solid and liquid wastes produced by sewage treatment, which contain a large amount of organic matt...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F11/143C02F11/06
CPCC02F11/06C02F11/14
Inventor 黎一夫王冬波杨国靖袁兴中冷立健蒋龙波王亚利管仁鹏曾光明
Owner HUNAN UNIV
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