A method and device for stabilizing heavy metals in anaerobic fermentation sludge by electrocatalysis

An anaerobic fermentation and heavy metal technology, applied in electrochemical sludge treatment, chemical instruments and methods, fixed/solidified sludge treatment, etc., can solve the long time period of anaerobic digestion and composting, and the low efficiency of sludge recycling , failure to achieve the purpose of capacity reduction, etc., to achieve the effect of improving the stabilization effect, high sludge fertilizer efficiency, and simple structure

Active Publication Date: 2021-10-29
KUNMING UNIV OF SCI & TECH
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  • Abstract
  • Description
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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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  • A method and device for stabilizing heavy metals in anaerobic fermentation sludge by electrocatalysis
  • A method and device for stabilizing heavy metals in anaerobic fermentation sludge by electrocatalysis
  • A method and device for stabilizing heavy metals in anaerobic fermentation sludge by electrocatalysis

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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 electroenhanced anaerobic fermentation sludge. Magnetized water, humus, nano-iron, and domesticated microbial liquid are mixed with A in a regulating tank. 2 The urban dewatered sludge treated by the / O process is stirred and mixed evenly, the water content and pH of the sludge are adjusted, and the mixed sludge slurry is transported to the fermenter by a pump; an anode and a cathode are set in the sludge of the fermenter to Continuously apply an electric field to the anode electrode in the fermenter to feed pulsed direct current, the sludge undergoes mesophilic anaerobic fermentation, collects biogas, and realizes the stabilization of heavy metals. During the fermentation process, the fermented liquid is regularly discharged. The bottom is removed to realize the separation of heavy metals and sludge, and at the same time achieve the purpose of sludge reduction; this method increases the content of heavy metals in the organic state and residue state of the sludge, and has high stabilization efficiency and good stabilization effect; Three-phase separation of solid, liquid and gas, high biogasification efficiency.

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 Patents(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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