Method for resource utilization of kitchen garbage anaerobic fermentation liquor

A technology of anaerobic fermentation liquid and kitchen waste, which is applied in the field of resource utilization of kitchen waste, can solve the problems of ineffective utilization of nutritional resources, large treatment pressure in sewage treatment plants, high treatment cost input, etc. Processing efficiency, reducing pretreatment energy consumption, and simplifying the effect of pretreatment process

Pending Publication Date: 2022-05-31
TONGJI UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the concentration of ammonia nitrogen in the biogas slurry is very high, which brings great treatment pressure to the sewage treatment plant. The high N content requires a very high carbon source cost in the denitrification process of the sewage treatment plant, which not only makes the rich nutrient resources not effectively utilized. , also resulting in a very high processing cost input
[0004] In view of the above problems, the existing method proposes to use electrodialysis to separate and concentrate the nutrients in the biogas slurry. Chinese patent CN112499846A discloses a method for the concentration and recovery of nutrients in biogas slurry. Chinese patent CN112520915A discloses a synchronous An anode electrodialysis method for recovering nitrogen and phosphorus in biogas slurry and removing antibiotics, separating N, P, and K in biogas slurry in order to use the concentrate as fertilizer, but this treatment method has several obvious disadvantages: First, electrodialysis The process has no selectivity for i

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  • Method for resource utilization of kitchen garbage anaerobic fermentation liquor
  • Method for resource utilization of kitchen garbage anaerobic fermentation liquor
  • Method for resource utilization of kitchen garbage anaerobic fermentation liquor

Examples

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Embodiment 1

[0025] In this embodiment, a method for resource utilization of anaerobic fermentation liquid of kitchen waste is provided.

[0026] Using the scheme of this example, synchronously desalinate and remove nitrogen from the digester effluent from a food waste anaerobic digestion treatment plant in stable operation. The anaerobic fermentation liquid of kitchen waste in this example stays in the digester for 28 days. Solid (TS) content 3.05%, volatile matter (VS) 40.33% TS, suspended solids 9.8g / L, pH 7.9, conductivity 34.1mS / cm, total organic carbon (TOC) concentration 3294.7mg / L, total nitrogen ( TN) concentration 4920.7mg / L, of which ammonia nitrogen (AN) concentration 3395.2mg / L, total phosphorus (TP) concentration 99.3mg / L, Cl - Concentration 3536.6mg / L, Na + The concentration is 2305.0mg / L.

[0027] figure 1 It is a schematic flowchart of the method for resource utilization of kitchen waste anaerobic fermentation liquid in this embodiment.

[0028] Such as figure 1 As sh...

Embodiment 2

[0049] In this embodiment, a method for resource utilization of anaerobic fermentation liquid of kitchen waste is provided.

[0050] Using the scheme of this example, the fresh fermentation broth from a kitchen waste anaerobic digestion treatment plant was desalinated and denitrified synchronously. The residence time of the fresh fermentation broth was only 1-2 days, and it was rich in organic acids; Total solids content 5.83%, volatile matter 80.64% TS, suspended solids 18.3g / L, pH 4.19, conductivity 12.6mS / cm, total organic carbon concentration 22606mg / L, total volatile organic acids (VFAs) concentration 9941.7mg / L, total nitrogen concentration 1883.4mg / L, of which ammonia nitrogen concentration 1364.8mg / L, total phosphorus concentration 377.0mg / L, Cl - Concentration 2669.2mg / L, Na + The concentration is 1711mg / L.

[0051] In step S1, the anaerobic fermentation liquid of the kitchen waste to be treated removes large solid particles through a simplified pretreatment proces...

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Abstract

The invention discloses a method for resource utilization of kitchen waste anaerobic fermentation broth, which is characterized by comprising the following steps: step 1, removing large-particle solids from the kitchen waste anaerobic fermentation broth to be treated through a simplified pretreatment process, thereby improving the treatment efficiency and reducing the energy consumption to obtain treated liquid; step 2, performing an electrodialysis process on the treated liquid by using an electrodialysis system to realize synchronous desalination and denitrification to obtain a concentrated solution and a desalted and denitrified fermentation solution; 3, maintaining the performance of an ion exchange membrane of the electrodialysis system through regular electrode reversing and chemical cleaning; and step 4, realizing resource utilization of the separated concentrated solution and the desalted and denitrified fermentation liquor.

Description

technical field [0001] The invention relates to the field of resource utilization of kitchen waste, in particular to a method for resource utilization of anaerobic fermentation liquid of kitchen waste. Background technique [0002] After the implementation of garbage classification in our country, a large amount of kitchen waste is sorted out, which is mainly treated by anaerobic digestion. How to recycle the resulting large amount of biogas slurry is becoming a bottleneck in the promotion of anaerobic digestion technology. The anaerobic fermentation liquid of kitchen waste is rich in N, P and organic matter. Returning to the field can provide a resource utilization outlet for the biogas slurry produced in large quantities. The rich nutrients in the biogas slurry are easily absorbed and utilized by plants, which can reduce the use of chemical fertilizers , to effectively reduce carbon emissions in the fertilizer production process; at the same time, the study in the "Effect ...

Claims

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Application Information

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IPC IPC(8): C05F9/02C05F9/04C05G3/80C05G5/20
CPCC05F9/02C05F9/04C05G3/80C05G5/20Y02E50/30
Inventor 吕凡王志杰何品晶章骅
Owner TONGJI UNIV
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