Method and device for stabilizing heavy metals in sludge by electrically promoting enhanced anaerobic fermentation

An anaerobic fermentation, heavy metal technology, applied in electrochemical sludge treatment, chemical instruments and methods, fixed/solidified sludge treatment, etc., can solve the problems of small processing capacity, poor volume stability, low stabilization efficiency, etc. The effect of increasing the content of metal iron and manganese bound state, reducing the content of metal unstable state, and increasing the speed of reproduction and metabolism

Active Publication Date: 2020-10-13
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

There are problems in the above method: 1. The time cycle of conventional anaerobic digestion and composting is long, and the degradation efficiency is low
2. The process is complicated, the energy consumption is high, and the processing capacity is small
3. The stabilization efficiency is low, the processing energy consumption is large, the stabilization effect is poor, and heavy metals are easily released again to cause secondary pollution
4. The efficiency of sludge recycling is low, the volume stability is poor, and the purpose of volume reduction cannot be achieved

Method used

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  • Method and device for stabilizing heavy metals in sludge by electrically promoting enhanced anaerobic fermentation
  • Method and device for stabilizing heavy metals in sludge by electrically promoting enhanced anaerobic fermentation
  • Method and device for stabilizing heavy metals in sludge by electrically promoting enhanced anaerobic fermentation

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Embodiment 1

[0041] Embodiment 1: The processing object of this embodiment is A of a certain sewage treatment plant 2 Dewatered sludge treated by / O process, the main mud index: pH is 6.2, moisture content is 80%, VS is 50%; the heavy metal content of activated sludge in this plant is Cu 220mg / kg, Zn1100mg / kg, Ni 30mg / kg, Pb 150mg / kg; see Table 1 for the weight percentages of the five forms of the four heavy metals in the original activated sludge in their respective total amounts.

[0042] Table 1 Percentage of various forms of heavy metals in raw activated sludge

[0043]

[0044] 1. Sludge pretreatment

[0045] Add humus, nanometer zero-valent iron, and domesticated microbial bacterial liquid into the regulating tank and stir and mix with the above-mentioned dewatered sludge; wherein the domesticated microbial bacterial liquid is obtained by using A 2 The solid-liquid mixture in the anaerobic tank of the O process sewage treatment plant is domesticated at a voltage of 1.5V for 2 w...

Embodiment 2

[0055] Embodiment 2: The processing object of this embodiment is A of a certain sewage treatment plant 2 / O process dewatered sludge, the main mud index: pH 6.5, moisture content 85%, VS 55%; heavy metal content of activated sludge in this plant is Cu: 250, Zn: 1200, Ni: 35, Pb: 140 (mg / kg). See Table 3 for the weight percentages of the five forms of the four heavy metals in the original activated sludge in their respective total amounts.

[0056] Table 3 Percentage of various forms of heavy metals in raw activated sludge

[0057]

[0058] 1. Sludge pretreatment

[0059] Humus, nano-Fe 3 o 41. Add the domesticated microbial liquid into the regulating tank and mix it evenly with the above-mentioned dewatered sludge; wherein the domesticated microbial liquid is obtained by using A 2 The solid-liquid mixture in the anaerobic tank of the O process sewage treatment plant is domesticated for 3 weeks at a voltage of 2.5V. The amount of the domesticated microbial bacterial sol...

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Abstract

The invention discloses a method and device for stabilizing heavy metals in sludge by electrically promoting enhanced anaerobic fermentation. According to the method and device for stabilizing heavy metals in the sludge by electrically promoting enhanced anaerobic fermentation, magnetized water, humus, nano-iron and acclimated microbial liquid are stirred and uniformly mixed with municipal dewatered sludge treated by an A2/O process in an adjusting tank, the water content and pH of the sludge are adjusted, and the uniformly mixed sludge slurry is conveyed to a fermentation tank through a pump;a positive electrode and a negative electrode are arranged in the sludge of the fermentation tank, pulse direct current is introduced into the positive electrode in the fermentation tank in a mannerof continuously applying an electric field; the sludge is subjected to medium-temperature anaerobic fermentation, biogas is collected, heavy metal stabilization is achieved; in the fermentation process, fermentation liquor is periodically discharged, exchangeable heavy metal is discharged from the bottom along with the fermentation liquor, the separation of the heavy metal and the sludge is achieved, and meanwhile the purpose of sludge reduction is achieved. The method increases the contents of heavy metal organic states and residue states in the sludge and has high stabilization efficiency and good stabilization effect; the separation of solid, liquid and gas in a sludge fermentation process is realized, and the biogas generation efficiency is high.

Description

technical field [0001] The invention relates to a method and a device for stabilizing heavy metals in anaerobic fermentation sludge with electric promotion, and belongs to the field of harmless treatment of solid waste resources. Background technique [0002] In recent years, with the rapid development of my country's industry and the acceleration of urbanization, the amount of sewage treatment and the by-product residual sludge generated during the treatment process have increased year by year. As of the end of 2015, the total amount of sewage treatment in my country has reached 217 million tons / day, and the scale of harmless disposal of sludge with a moisture content of 80% has reached 37,400 tons / day. It is predicted that it will reach 97,500 tons / day by 2020, and Sludge dehydration is difficult, which will cause problems such as occupying land area, inconvenient transportation and treatment. The excess sludge produced by urban sewage treatment plants is rich in organic m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F11/02C02F11/04C02F11/12C02F11/00C02F101/20
CPCC02F11/00C02F11/006C02F11/008C02F11/02C02F11/04C02F11/12C02F2101/20
Inventor 瞿广飞李恒李军燕丁海山
Owner KUNMING UNIV OF SCI & TECH
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