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Method for realizing biogas slurry reutilization by recycling biogas slurry

A resource recovery and biogas slurry technology, which is applied in the direction of chemical instruments and methods, microorganism-based methods, biochemical equipment and methods, etc., to achieve the effect of multiple resource recovery methods, wide application range, and reduced operating costs and floor space

Active Publication Date: 2012-06-20
JIANGNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although we have implemented 32 batches of biogas slurry recycling alcohol fermentation experiments, we have not found the impact of the accumulation of the above-mentioned inorganic ions, pigments and other substances on fermentation, but it can be foreseen that the infinite circulation of biogas slurry may be interrupted. risk remains

Method used

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  • Method for realizing biogas slurry reutilization by recycling biogas slurry
  • Method for realizing biogas slurry reutilization by recycling biogas slurry
  • Method for realizing biogas slurry reutilization by recycling biogas slurry

Examples

Experimental program
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Effect test

Embodiment 1

[0047] Embodiment one: a kind of method that realizes biogas slurry reuse to produce alcohol, such as figure 2 As shown, it mainly includes the following process steps:

[0048] Step 201: The alcoholic fermentation liquid is distilled to obtain distillation waste liquid and products, and the total COD of the distillation waste liquid is 100000 mg / L;

[0049] Step 202: The alcohol distillation waste liquid undergoes solid-liquid separation to obtain centrifuged mother liquor and distiller's grains; here, step 202 can be selected according to actual needs;

[0050] In this embodiment, this step is selected to be performed, and the solid-liquid separation adopts the decanter centrifugation method for separation, and the solid-liquid separation adopts other separation methods and does not affect the implementation of this example;

[0051] Step 203: Cool the waste liquid from step 201 or step 202 to 55°C, enter the first-stage high-temperature anaerobic UASB reactor, maintain th...

Embodiment 2

[0062] Embodiment two: a kind of method that realizes biogas slurry reuse to produce alcohol:

[0063] Different from the first embodiment above, in this embodiment, if figure 2 Shown include the following process steps

[0064] Step 201: The alcohol fermentation liquid is distilled to obtain distillation waste liquid and products, and the total COD of the distillation waste liquid is 95000 mg / L;

[0065] In this embodiment, step 202 is not selected;

[0066] In step 203: will enter the first-stage high-temperature anaerobic UASB reactor, adjust the maintenance temperature to 50°C, and adjust the hydraulic retention time (HRT) to 6d;

[0067] In this embodiment, step 204 is selected to be executed, and the solid-liquid separation adopts horizontal screw centrifugation and then is separated in series by a plate-and-frame filtration method;

[0068] In step 205: maintain the temperature and adjust it to 50° C., feed air with an air ratio of 6 L / L.min and keep stirring for 2 ...

Embodiment 3

[0074] Embodiment three: a kind of method that realizes biogas slurry reuse to produce citric acid, such as image 3 As shown, it mainly includes the following process steps:

[0075] Step 301: The citric acid fermentation broth adopts the method of calcium salt precipitation to obtain the extraction waste liquid and the crude product, and the total COD of the extraction waste liquid is 15000 mg / L; using other extraction methods does not affect the implementation of the present invention;

[0076] Step 302: Put the extraction waste liquid into the first-stage high-temperature anaerobic UASB reactor, maintain the temperature at 60° C., maintain the hydraulic retention time (HRT) at 2 days, and keep the pH at 7.5-8.0. The first-stage high-temperature anaerobic effluent undergoes natural settlement and is cooled to 45°C at the same time. The settled sludge is filtered through a plate and frame, and the filtrate and effluent enter the second-stage medium-temperature UASB reactor. ...

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Abstract

The invention relates to a method for realizing biogas slurry reutilization by recycling biogas slurry. The method is characterized by comprising the following steps: enabling extracted waste liquor subjected to or not subjected to solid-liquid separation to enter an anaerobic biogas fermentation tank for biogas fermentation, conducting micro-oxygenation, decolorization, solid acid treatment and other processes on the biogas slurry, recycling and using the processed biogas slurry as water for mixing when the processed biogas slurry meets the requirements of process water, conducting liquefaction, saccharification, fermentation, extraction and other regular production processes on the processed biogas slurry, obtaining fermentation products, and enabling the extracted waste liquor to enter the next recirculation. According to the method, the following advantages can be achieved: the biogas slurry can be recycled all the time, not only can the waste water pollution in the traditional fermentation product process can be obviated, but also the biogas slurry reutilization can be realized, a large amount of valuable water resources can be saved, aerobic process is abandoned, and the production cost is lowered.

Description

technical field [0001] The invention relates to a method for biogas slurry reuse to realize the resource utilization of biogas slurry, specifically refers to anaerobic biogas fermentation of the extraction waste liquid produced in the biological fermentation industry, and micro-oxidation of the biogas slurry (that is, anaerobic effluent) After treatment, decolorization treatment, and solid acid adsorption treatment, the process water used for product production can be recycled to realize the purpose of biogas slurry resource utilization, thereby reducing the pollution of productive wastewater, and at the same time greatly reducing the consumption of water resources and reducing production costs . The invention belongs to the technical field of biological fermentation industry. Background technique [0002] The biological fermentation industry involves food, medicine, chemical industry and other fields, occupies an important position in the national economy, and its developm...

Claims

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Application Information

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IPC IPC(8): C02F9/14C12P5/02C12P7/06C12P7/48C12P37/00C12R1/865C12R1/685C12R1/80C07C31/08C07C29/80C07C59/265C07C51/42C07D499/18C07D499/46
CPCY02E50/343Y02E50/17Y02E50/10Y02E50/30
Inventor 张宏建张建华唐蕾毛忠贵
Owner JIANGNAN UNIV
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