Method for producing volatile fatty acid by normal-temperature low-oxygen digestion of yeast reinforced excess activated sludge

A volatile fatty acid, residual activity technology, applied in chemical instruments and methods, biological sludge treatment, water/sludge/sewage treatment, etc., can solve the problems of slow hydrolysis process, anoxic state, long residence time, etc. , to achieve low operating costs, promote degradation, and improve the effect of nitrogen and phosphorus removal

Inactive Publication Date: 2018-05-18
BEIJING UNIV OF TECH
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Problems solved by technology

The hydrolysis process in the three stages is slow and is the rate-limiting step of anaerobic digestion, so anaerobic digestion generally requires a longer residence time and a larger digester
However, these processes can only simply improve sludge stability and dehydration performance or increase methane production, and cannot make

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  • Method for producing volatile fatty acid by normal-temperature low-oxygen digestion of yeast reinforced excess activated sludge
  • Method for producing volatile fatty acid by normal-temperature low-oxygen digestion of yeast reinforced excess activated sludge
  • Method for producing volatile fatty acid by normal-temperature low-oxygen digestion of yeast reinforced excess activated sludge

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Embodiment

[0022] Digestion reactor in the present invention such as figure 1 shown. Take the return sludge from the secondary settling tank of the sewage treatment plant and settle it at 4°C for 24 hours, remove the supernatant, and measure the suspended solid concentration SS of the concentrated residual sludge to be 24067mg / L, the volatile suspended solid concentration VSS to be 14500mg / L, and the pH is 6.8. Take the concentrated sludge and put it into the microaerobic digestion reactor, set up 4 reactors, and inoculate different quality yeasts respectively. The yeast inoculated in the experiment is Angel high active dry yeast sold in the market. The concentration of yeast in each reactor after inoculation is 0g / L, 1g / L, 5g / L, 10g / L. Adjust the stirring speed of the agitator 5 to fully mix the sludge. Turn on the air pump 3, and the gas enters the reactor through the air pipe 4, the gas flow meter 2 and the air diffuser 1. Adjust the gas flow meter 2 so that the measured value of ...

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Abstract

The invention provides a method for producing volatile fatty acid by normal-temperature low-oxygen digestion of yeast reinforced excess activated sludge and belongs to the technical field of treatmentof municipal sewage and sludge. Aiming at the problem of insufficient accumulation of volatile fatty acids in an excess sludge digestion process, a yeast inoculation method is adopted during initialsludge digestion, macromolecular organic substances in sludge are degraded by rich enzyme systems of the yeast, and production of volatile fatty acids is promoted. Cheap and easily available yeast isadopted in the method, the yield of volatile fatty acids is increased substantially, and when the concentration of the yeast is 10 g/L, the highest concentration of volatile fatty acids is 10-12 timesthe concentration of volatile fatty acids without the yeast. A digestion product rich in volatile fatty acids is used as an organic carbon source of function microbes for removing nitrogen and phosphorus from the sewage, sludge reduction and recycling are realized, the problem of insufficient carbon source of a municipal sewage treatment plant in a biological nitrogen and phosphorus removal process is solved, cost for feeding an external carbon source is saved, and the nitrogen and phosphorus removal effect of the sewage treatment plant is improved.

Description

technical field [0001] The invention belongs to the technical field of urban sewage sludge treatment, and relates to a method for using angel yeast to strengthen normal-temperature micro-aerobic digestion of excess activated sludge to produce volatile fatty acids. Background technique [0002] Water eutrophication has become the most prominent global water environment problem. A large number of studies have shown that the excessive discharge of sewage rich in nitrogen and phosphorus is the main cause of surface water eutrophication. Biological nitrogen and phosphorus removal technology has been widely used in sewage treatment plants in major cities due to its cost-effective features. At present, urban sewage plants are facing two major problems in the process of operation: one is insufficient carbon source, which has become the bottleneck of low C / N ratio sewage denitrification and phosphorus removal; Disposal. Therefore, the development of internal carbon sources and the ...

Claims

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Application Information

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IPC IPC(8): C02F11/02C02F3/00
CPCC02F3/00C02F11/02
Inventor 曾薇赵丹张立东李宁彭永臻
Owner BEIJING UNIV OF TECH
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