Multistage fermentation device containing fermentation liquor reflux and denitrification system

A fermentation device and fermentation system technology, applied in the field of biomass resource utilization, can solve problems such as the inability of biogas projects to run stably, and achieve the effects of prolonging the number of biogas slurry reflux, improving utilization ratio, and improving efficiency

Active Publication Date: 2016-04-13
UNIV OF SCI & TECH BEIJING
View PDF4 Cites 5 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The present invention solves the ammonia nitrogen accumulation effect easily produced by biogas slurry reflux in the anaerobic fermentation system. When the concentration of ammonia nitrogen in the biogas slurry accumulates to a certain level, it will cause toxicity to methanogens and inhibit their activity, thereby delaying the progress of anaerobic fermentation. process, resulting in problems such as the inability of stable operation of the biogas project to provide a multi-stage fermentation device including a fermentation broth reflux denitrification system

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Multistage fermentation device containing fermentation liquor reflux and denitrification system
  • Multistage fermentation device containing fermentation liquor reflux and denitrification system
  • Multistage fermentation device containing fermentation liquor reflux and denitrification system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Use the above-mentioned anaerobic fermentation device to treat the food waste generated in a canteen. Before the food waste enters the anaerobic fermentation system, it is pretreated to remove bones, peels, plastic bags, etc. with large particle sizes. The sorted food waste is crushed and mixed with a mixer, then mixed with the refluxing biogas slurry, and then enters the mixing and feeding device 5, and the pH of the fermentation feed liquid is adjusted to 6-6.5. The regulated fermentation feed liquid enters the No. 1 fermentation tank 26 through the valve 6, the pump 3 and the flow meter 2 for fermentation. The hydraulic retention time of the fermentation feed liquid in the No. 1 fermenter 26 is 1 day. The fermented liquid produced by the No. 1 fermenter 26 enters the No. 2 fermenter 27 through the fermented liquid outlet 11, valve 6, pump 3 and flowmeter 2 for fermentation. The hydraulic retention time of the fermented liquid in No. 2 fermenter 27 is 8 days. The f...

Embodiment 2

[0040] combine figure 1 To illustrate this embodiment, in this embodiment, a part of the biogas slurry treated by the fermentation liquid denitrification system is returned in equal amounts to the front ends of No. 1 fermenter 26, No. Reactor for fermentation. The food waste feed load of the whole fermentation system is increased to 1.2 times that of Example 1. Other connections and operating parameters are the same as in Example 1. The yields of hydrogen and methane in the fermentation system were 220-330ml / gVS and 610-900ml / gVS respectively. The recovery rate of struvite is 280-4000mg / L- biogas slurry. The concentration of ammonia nitrogen in the discharged biogas slurry is lower than 2700mg / L.

Embodiment 3

[0042] combine figure 2 To illustrate this embodiment, in this embodiment, the fermented liquid produced by No. 1 fermenter 26 enters No. 3 fermenter 28 through fermented liquid outlet 11, valve 6, pump 3 and flowmeter 2 for fermentation. Simultaneously, the fermentation residue produced by No. 1 fermenter 26 enters No. 3 fermenter 28 through residue discharge port 12, valve 6, pump 3 and flowmeter 2 for fermentation. The fermentation residue produced by the No. 3 fermentation tank 28 is discharged to the biogas residue treatment system 13 through the residue discharge port 12 , the valve 6 and the flow meter 2 . The hydraulic retention time of the fermented liquid in No. 3 fermenter 28 is 35 days. The fermented liquid produced by the No. 3 fermenter 28 enters the solid-liquid separator 14 through the fermented liquid discharge port 11, the valve 6, the pump 3 and the flowmeter 2 for solid-liquid separation. Other connections and operating parameters are the same as in Exam...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

The invention provides a multistage fermentation device containing a fermentation liquor reflux and denitrification system, and belongs to the technical field of biomass resource recovery. The device comprises a feeding system, a multistage fermentation system, a biogas residue treatment system, a solid-liquid separation system, a fermentation liquor denitrification system, a biogas liquid reflux system, biogas liquid and biogas residue pipelines, pumps, valves and flowmeters. The feeding system comprises a biomass pretreatment device and a mixed feeding device; the multistage fermentation system is formed by multiple fermentation tanks which are connected in series or in parallel; the fermentation liquor denitrification system is composed of a reactor, an aeration device with replaceable steel mesh, a stirring device, a water quality regulating device and a struvite recovery tank; the biogas liquid reflux system is composed of the biogas liquid pipeline, the pump, the valve and the flowmeter. The multistage fermentation device containing the fermentation liquor reflux and denitrification system has the advantages of being capable of cycling struvite crystals, effectively reducing ammonia nitrogen concentration in reflux fermentation liquid, relieving the fermentation system ammonia inhibition effect and improving the fermentation system performance and capable of being applied to anaerobic fermentation of biomass.

Description

technical field [0001] The invention relates to the technical field of biomass resource utilization, in particular to a multi-stage fermentation device including a fermentation liquid reflux denitrification system. Background technique [0002] At present, anaerobic fermentation is one of the effective means to treat biomass raw materials and organic components in municipal waste, such as kitchen waste. After anaerobic fermentation treatment, these organic matters are transformed into a large number of secondary products, biogas and solid-liquid mixed residue. Among them, biogas can be used for power generation or as fuel; solid-liquid mixed residues cannot be directly landfilled or entered into sewage treatment plants, but must undergo dehydration treatment. The biogas residue and biogas slurry formed after dehydration are finally treated, and the biogas residue can be made into organic fertilizer through aerobic fermentation; biogas slurry cannot be used directly as ferti...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
Patent Type & Authority Applications(China)
IPC IPC(8): C12M1/36C12M1/34C12M1/107C12M1/04C12M1/02
CPCC12M21/04C12M23/58C12M27/02C12M29/06C12M29/18C12M41/32C12M41/40Y02E50/30
Inventor 吴川福于淼郭延戴婉琴汪群慧
Owner UNIV OF SCI & TECH BEIJING
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap