A method for predicting the concentration of ammonia nitrogen in anaerobic fermentation tank under reflux process

A technology of anaerobic fermentation and ammonia nitrogen concentration, which is applied in the field of biogas engineering, can solve environmental pollution and other problems, and achieve the effects of reducing hidden risks and significant social and economic benefits

A technology of anaerobic fermentation and ammonia nitrogen concentration, which is applied in the field of biogas engineering, can solve environmental pollution and other problems, and achieve the effects of reducing hidden risks and significant social and economic benefits

CN104866913BActive Publication Date: 2018-11-09CHINA AGRI UNIV
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  • A method for predicting the concentration of ammonia nitrogen in anaerobic fermentation tank under reflux process
  • A method for predicting the concentration of ammonia nitrogen in anaerobic fermentation tank under reflux process
  • A method for predicting the concentration of ammonia nitrogen in anaerobic fermentation tank under reflux process

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Embodiment Construction

[0028] The method of the present invention will be described in detail below in conjunction with examples.

[0029] Experimental conditions: total solid content of dried chicken manure as fermentation raw material: 90%; volatile solid content: 71.4%;

[0030] Raw material nitrogen content: 4.9% / g total solid content;

[0031] Anaerobic fermentation organic load: 3g VS / L / d;

[0032] Effective volume of CSTR: 20L;

[0033] Hydraulic retention time 25d;

[0034] The daily volume of in and out materials is 0.8L;

[0035] Ammonia nitrogen content in biogas slurry under stable operating conditions before reflux: 2.4g / L

[0036] Suppose: the reflux process does not affect the conversion rate of ammonia nitrogen, then a 0 =a 1 =a 2 =…=a n

[0037] The nitrogen content of dry chicken manure added to the fermenter every day = 3*20*90%*4.9% / 71.43% = 3.7g;

[0038] a 0 =2.4*0.8 / 3.7=0.52; y 0 = 2.4; R = 0.625

[0039] H=[20-(1-0.625)*0.8] / 20=0.985 T=3.7 / 20=0.185

[0040] The ...

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Abstract

The invention discloses a method for predicting ammonia nitrogen concentration in an anaerobic fermentor under a backflow process. The method can easily predict dynamic change of the ammonia nitrogen concentration in the fermentor with the increase of backflow time through a formula yn=H<n>*y0+T*a0*[( H<n>-1) / (H-1)] according to active volume of the fermentor, feeding and discharging volume per time, biogas slurry backflow ratio, feeding material organic matter nitrogen content and ammonia nitrogen concentration in the fermentor at the period of backflow beginning stable fermentation. The method has the advantages of being simple and reliable, can better predict the dynamic change trend of the ammonia nitrogen concentration under the backflow process, and provides a mathematical analysis tool for preventing ammonia inhibition in the fermentor.

Description

technical field [0001] The invention relates to the technical field of biogas engineering, in particular to a method for predicting the concentration of ammonia nitrogen in a fermentation tank under an anaerobic fermentation biogas slurry reflux process. Background technique [0002] Anaerobic fermentation biogas technology has attracted widespread attention and rapid development around the world in recent years due to its dual functions of alleviating environmental pollution from livestock and poultry manure and alleviating the pressure of increasing rural energy demand. However, large-scale biogas projects bring a large amount of bioenergy to the entire village and farm, increasing economic and environmental benefits while also producing a large amount of biogas slurry. Biogas slurry is rich in nutrients and is usually returned to the field for utilization. However, in some areas, due to the lack of reasonable planning and matching of the planting and breeding industry str...

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Application Information

Patent Timeline
09 Nov 2018
Publication
CN104866913B
IPC
G06Q10/04; G06F17/50; C02F11/04
Inventors
董仁杰; 吴树彪