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
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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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