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A method for biologically treating excess sludge to produce sludge protein

A technology of excess sludge and sludge protein, applied in the biological field, can solve the problems of unfavorable sludge protein promotion and application, sludge protein has odor, and complicated process, so as to improve the use value, prevent the generation of odor, and have a wide application prospect Effect

Active Publication Date: 2016-05-04
天津北洋百川生物技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Application No.: 2006100190637 Chinese patent "Production process and equipment for hydrolyzed protein by hydrolysis of excess activated sludge with quicklime" and patent application No.: 021162271 Chinese patent "Treatment of activated sludge produced by sewage treatment and method of extracting protein" provides The treatment process of excess sludge, but there are certain shortcomings, the process is complicated, the energy consumption is high, and the sludge protein after treatment has an odor, which is not conducive to the promotion and application of sludge protein

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] 1. Add the remaining sludge with a water content of 98% to a 5L fermenter, and then add the biological mixed bacterial solution. The total amount of biological bacterial solution added is 4.5% of the sludge mass, including Bacillus subtilis, Bacillus amyloliquefaciens and Bacillus licheniformis Bacillus, the addition amount of Bacillus megaterium liquid is 5 parts, 1 part, 2 parts, 1 part respectively; Wherein the specific concentration of Bacillus subtilis liquid and Bacillus amyloliquefaciens liquid is 5.5×10 8 -6.0×10 8 individual / ml, the concentration of Bacillus megaterium and Bacillus licheniformis was 5.0×10 8 -5.5×10 8 pieces / ml.

[0018] 2. Put the remaining sludge added with the biological mixed bacteria solution into the liquid fermenter, at 45°C, and the ventilation rate is 0.4L×min -1 , heat-preserved and fermented for 20 hours, and finally filtered through plate and frame, and the filtrate is concentrated to obtain sludge protein liquid, which can be us...

Embodiment 2

[0023] 1. Add the remaining sludge with a water content of 98% to a 5L fermenter, and then add the biological mixed bacterial liquid. The addition amount of Bacillus megaterium liquid is 7 parts, 3 parts, 4 parts, 3 parts respectively; Wherein the specific concentration of Bacillus subtilis liquid and Bacillus amyloliquefaciens liquid is 5.5×10 8 -6.0×10 8 individual / ml, the concentration of Bacillus megaterium and Bacillus licheniformis was 5.0×10 8 -5.5×10 8 pieces / ml.

[0024] 2. Put the remaining sludge added with the biological mixed bacteria liquid into the liquid fermenter, 55°C, and the ventilation rate is 0.4L×min -1 , heat-preserved and fermented for 18 hours, and finally filtered through a plate and frame, and concentrated to obtain a sludge protein solution, which can be used as a foam fire extinguishing agent and a microbial nutrient. The filter cake after plate and frame pressure filtration can be used as organic fertilizer and livestock feed after drying.

...

Embodiment 3

[0027] 1. Add the remaining sludge with a water content of 98% to a 5L fermenter, and then add the biological mixed bacterial liquid. The addition amount of Bacillus megaterium liquid is respectively 10 parts, 5 parts, 7 parts, 5 parts; wherein the specific concentration of Bacillus subtilis liquid and Bacillus amyloliquefaciens liquid is 5.5×10 8 -6.0×10 8 individual / ml, the concentration of Bacillus megaterium and Bacillus licheniformis was 5.0×10 8 -5.5×10 8 pieces / ml.

[0028] 2. Put the remaining sludge added with the biological mixed bacteria liquid into the liquid fermenter, 35°C, and the ventilation rate is 0.4L×min -1 , heat-preserved and fermented for 24 hours, and finally filtered through a plate and frame, and concentrated to obtain a sludge protein solution, which can be used as a foam fire extinguishing agent and a microbial nutrient. The filter cake after plate and frame pressure filtration can be used as organic fertilizer and livestock feed after drying. ...

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Abstract

The invention discloses a method for producing sludge protein by treating surplus sludge by a biological method, and belongs to the technical field of biological. The method is characterized by comprising the following steps of: adding the mixed culture of bacillus subtilis, bacillus amyloliquefaciens, bacillus licheniformis and bacillus megatherium in the mass ratio of (5-10): (1-5): (2-7): (1-5) to the surplus sludge, introducing air to a liquid fermentation tank by an amount of 0.2-0.6L*min<-1> at a temperature ranging from 35 to 55 DEG C, and carrying heat retaining fermentation for 18-24 hours; carrying out plate-frame pressure filtration, concentrating the filtrate and utilizing the concentrated filtrate as a foam extinguishing agent and a nutritional agent for microorganisms; and drying the filter cake as an organic fertilizer and a livestock feed. The secondary pollution caused by the surplus sludge is avoided, and the utilization value of sludge is greatly increased.

Description

Technical field: [0001] The invention belongs to the field of biological technology, and in particular relates to a method for producing sludge protein from excess sludge by using a biological mixed bacterial liquid method. Background technique: [0002] Now sludge treatment generally adopts activated sludge treatment method. Activated sludge treatment of sewage will produce a large amount of excess sludge, which contains a large amount of organic matter. Improper disposal will cause secondary pollution of the environment and waste of resources. At present, the main treatment methods for excess sludge are: landfill, throwing into the sea, incineration, chemical treatment, physical method treatment, and biological reduction treatment. The above methods have certain deficiencies in the treatment or reuse of excess sludge. For example, commonly used physical or chemical methods, due to the increase in temperature, will produce a large amount of sludge decomposition, oxidation o...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C12P21/00A62D1/02C05F7/00A23K20/147C12R1/07C12R1/10C12R1/11
CPCY02A40/20
Inventor 乔长晟张宇彭巧王羿超
Owner 天津北洋百川生物技术有限公司