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Sludge stabilizing electrochemical treating process

A treatment method and electrochemical technology, applied in the field of environmental engineering, can solve the problems of difficult application, difficult operation, and high safety requirements, and achieve the effects of short treatment time, small investment in infrastructure, and low power consumption.

Inactive Publication Date: 2007-08-22
SHANGHAI JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The cost of biological stabilization technology is relatively low, but it has the disadvantages of occupying a large area and taking a long time
In addition to biological stabilization technology, chemical stabilization (lime stabilization, chlorine oxidation, and ozone oxidation, etc.) is also applied to a certain extent. Chemical stabilization technology has a relatively short treatment time, but the volume of sludge becomes larger after treatment (such as lime stabilization) Or high safety requirements and difficult operation (such as chlorine gas stability, ozone stability), etc., so it is relatively rare in practical applications
In addition, the current sludge stabilization technology also includes physical method stabilization (such as high temperature treatment, ultrasonic treatment, etc.), but physical method stabilization is difficult to put into application because of too much energy consumption and unsatisfactory results.
Electrochemical methods are widely used in sewage treatment, but there are no relevant reports on sludge stabilization.

Method used

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  • Sludge stabilizing electrochemical treating process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Take the liquid sludge with a solid content rate of 1.8% from a sewage plant in Shanghai, and use the device in Figure 1 to carry out electrolysis treatment using a stabilized power supply under the condition of no aeration and agitation. The distance between the negative and positive electrodes in the electrolysis device is 2cm, and the voltage is 20V. The current is 0.8A, after 20 minutes of electrolysis, the degradation rate of volatile solids in the sludge can reach 27%, and after 50 minutes of electrolysis, the volatile solids in the sludge can be removed by 37%, and the pathogens are all killed after 20 minutes of electrolysis .

Embodiment 2

[0022] Take the liquid sludge with a solid content rate of 2.7% from a sewage plant in Shanghai, and use the device in Figure 1 to perform electrolysis treatment under the condition of aeration and agitation. The distance between the cathode and anode electrodes in the electrolysis device is 10cm, the voltage is 40V, and the current is 1.6A. After 15 minutes of electrolysis, the degradation rate of volatile solids in sludge can reach 43%, after 20 minutes of electrolysis, 48% of volatile solids in sludge can be removed, after 30 minutes of electrolysis, the removal rate of volatile solids in sludge can reach 49% , Pathogens are all killed after 15 minutes of electrolysis.

Embodiment 3

[0024] Take liquid sludge with a solid content rate of 2.7% from a sewage plant in Shanghai, and use the device shown in Figure 1 to perform electrolysis treatment under the condition of aeration and agitation. The distance between the cathode and anode electrodes in the electrolysis device is 4cm, the voltage is 20V, and the current is 1.6A. Before electrolysis, add 1% sodium chloride (g / 100ml sludge, i.e. sodium chloride weight / sludge volume ratio), after 10 minutes of electrolysis, the degradation rate of volatile solids in the sludge can reach 40%, after 15 minutes of electrolysis, The volatile solids in the sludge can be removed by 47%; if the sludge is directly acidified to pH 4.1 with hydrochloric acid without adding sodium chloride, the sludge can achieve a stabilization effect of about 40% in about 10 minutes. After electrolysis for 15 minutes, the volatile solids in the sludge were reduced by 45%, and all pathogens were killed.

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Abstract

The sludge stabilizing electrochemical treating process includes to set sludge from primary settling tank and the secondary settling tank into electrolytic apparatus with cathode and anode or with 3D electrodes, electrolytic treatment with voltage regulating power supply or pulse power supply under static condition, aeration stirring or mechanically stirring condition for 5-50 min to stabilize sludge and kill pathogen in sludge completely. Hydrochloric acid, sodium chloride or electrolyte may be added to speed the sludge stabilizing treatment. The present invention has simple process, low power consumption and less investment, and the technology may be adopted in sewage treating yard.

Description

technical field [0001] The invention relates to a sludge stabilizing electrochemical treatment method, which uses the electrochemical method to stabilize and harmlessly treat the sludge of urban sewage plants, and belongs to the technical field of environmental engineering. Background technique [0002] Sludge is a secondary product of urban sewage treatment plants. The sludge discharged from the primary settling tank and secondary settling tank of the sewage treatment plant will emit a strong odor because it contains a large amount of organic components that are easily corrupted; in addition, the sewage There are often a large number of parasite eggs and pathogenic microorganisms in the mud. Therefore, before the sludge is disposed of in agriculture or landfill, it is often necessary to stabilize the sludge. At present, the sludge stabilization treatment mainly adopts biological stabilization technology, including anaerobic digestion, aerobic digestion, high-temperature mi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F11/00C02F1/461
Inventor 朱南文刘冬陈娇贾金平沈佳麟黄伟红
Owner SHANGHAI JIAOTONG UNIV