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Method for promoting anaerobic digestion sludge heavy metal stability

An anaerobic digestion, heavy metal technology, applied in chemical instruments and methods, biological sludge treatment, water/sludge/sewage treatment, etc., to achieve rapid fixation

Pending Publication Date: 2019-04-16
GUANGDONG INST OF ECO ENVIRONMENT & SOIL SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

After searching, there is no report on the application of iron-reducing bacteria in the passivation of heavy metals in the process of sludge anaerobic digestion

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  • Method for promoting anaerobic digestion sludge heavy metal stability
  • Method for promoting anaerobic digestion sludge heavy metal stability
  • Method for promoting anaerobic digestion sludge heavy metal stability

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] (1) Adjust the TCOD of anaerobic digested sludge to 30000mg / L, pH to about 7.0, pass N 2 When the oxidation-reduction potential (ORP) is less than -300mV (usually 30min). Then, at N 2 Under the protection of the sludge, the specification is 500mL, and the working volume is an anaerobic reaction bottle of 300mL. At the same time, in the anaerobic reaction bottle, every 1L of anaerobic digested sludge is added with 1% v / v iron-reducing bacteria agent ( The concentration of effective viable bacteria in the iron-reducing bacteria agent is ≥6×10 9 CFU / mL), cap the bottle tightly and seal it with parafilm. The treatment not inoculated with iron-reducing bacteria was used as the control.

[0029] The above anaerobic digested sludge was collected from the return sludge of the secondary settling tank of a sewage plant (the inoculation sludge used in this experiment was fresh activated sludge from a sewage treatment plant), and the retrieved sludge was first filtered through a...

Embodiment 2

[0039] (1) Adjust the TCOD of anaerobic digested sludge to 20000mg / L, pH to about 7.0, pass N 2When the oxidation-reduction potential (ORP) is less than -300mV (usually 30min). Then, at N 2 Under the protection of the sludge, the specification is 500mL, and the working volume is an anaerobic reaction bottle of 300mL. At the same time, in the anaerobic reaction bottle, every 1L of anaerobic digested sludge is added with 2% v / v iron reducing bacteria agent ( The concentration of effective viable bacteria in the iron-reducing bacteria agent is ≥6×10 9 CFU / mL), cap the bottle tightly and seal it with parafilm. The treatment not inoculated with iron-reducing bacteria was used as the control.

[0040] The above-mentioned anaerobic digested sludge was collected from the return sludge of the secondary settling tank of a sewage plant. The retrieved sludge was first filtered through a 40-mesh screen and then settled for 24 hours. Save the concentrated sludge. The basic physical and...

Embodiment 3

[0049] (1) Adjust the TCOD of anaerobic digested sludge to 10000mg / L, pH to about 7.0, pass N 2 When the oxidation-reduction potential (ORP) is less than -300mV (usually 30min). Then, at N 2 Under the protection of the sludge, the specification is 500mL, and the working volume is an anaerobic reaction bottle of 300mL. At the same time, in the anaerobic reaction bottle, every 1L of anaerobic digested sludge is added with 2% v / v iron reducing bacteria agent ( The concentration of effective viable bacteria in the iron-reducing bacteria agent is ≥6×10 9 CFU / mL), cap the bottle tightly and seal it with parafilm. The treatment not inoculated with iron-reducing bacteria was used as the control.

[0050] The above-mentioned anaerobic digested sludge was collected from the return sludge of the secondary settling tank of a sewage plant. The retrieved sludge was first filtered through a 40-mesh screen and then settled for 24 hours. Save the concentrated sludge. The basic physical an...

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Abstract

The invention discloses a method for promoting anaerobic digestion sludge heavy metal stability. The method comprises the steps that iron reducing bacteria are added in anaerobic digestion sludge, andanaerobic digestion is conducted for 20-60 days at 25-37 DEG C; the iron reducing bacteria are selected from at least one of humus reductive corynebacterium, iron reducing comamonas and klebsiella pneumoniae. According to the method, heavy metal can form stable minerals, and then rapid fixation of the heavy metal is achieved. In the iron reducing bacteria iron reduction process, mineralization oforganic matter is coupled, and meanwhile the sludge digestion process is directly accelerated.

Description

technical field [0001] The invention belongs to the field of environmental protection, and in particular relates to a method for inoculating an iron-reducing bacteria agent in the sludge anaerobic digestion process and promoting the stability of heavy metals. Background technique [0002] Municipal sludge is the sediment produced in the process of municipal sewage treatment. my country's annual output of sludge is more than 40 million tons, and it is growing at a rate of 15% per year. Therefore, how to dispose of municipal sludge scientifically and rationally is an environmental problem that needs to be solved urgently. At present, the sludge reduction-harmless-stabilization disposal methods are mainly aerobic fermentation, anaerobic digestion, dry incineration and so on. However, because the sludge enriches most of the heavy metals in the sewage treatment process, such as Cu, Pb, Cr, Cd and other heavy metals, the heavy metals cannot be effectively controlled in the proce...

Claims

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Application Information

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IPC IPC(8): C02F11/02C02F101/20C02F101/22
CPCC02F11/02C02F2101/20C02F2101/22
Inventor 余震王跃强刘静汤佳刘晓明周顺桂
Owner GUANGDONG INST OF ECO ENVIRONMENT & SOIL SCI
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