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Method for strengthening anaerobic digestion of rural toilet excrement

A technology of anaerobic digestion and anaerobic digestion system, applied in the field of rural toilet manure treatment, can solve the problems of slow hydrolysis and acidification rate, and achieve the effect of accelerating the start-up speed, resisting acidification shock, and improving microbial activity

Active Publication Date: 2021-07-09
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The invention adopts the method of adding iron-nickel hydroxyl complex to solve the problems of ammonia nitrogen inhibition and slow hydrolysis acidification rate in the anaerobic digestion process of rural toilet excrement. By improving the anaerobic digestion environment, the microbial activity of the system is improved, and iron Nickel works synergistically to boost methane production in anaerobic digestion systems while boosting system organic loads

Method used

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  • Method for strengthening anaerobic digestion of rural toilet excrement
  • Method for strengthening anaerobic digestion of rural toilet excrement
  • Method for strengthening anaerobic digestion of rural toilet excrement

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] The source-separated feces and urine and water mixture recovered from the source-separated toilet are used as the matrix, and the anaerobic digested sludge in the stably operated fecal-urine anaerobic digestion reactor is used as the inoculum, and then the iron-nickel hydroxyl complex is added. The experiment can be carried out under the conditions of 35°C-55°C and 70-150r / min. During the experiment, pH and volatile fatty acid content were monitored, biogas production, gas components and hydrogen sulfide concentration were measured, and TS (Total Solid, total solid) and VS (Volatile Solid, volatile solid) were measured before and after anaerobic digestion.

Embodiment 2

[0034] The purpose of this example is to implement a method for strengthening the anaerobic digestion of feces and urine in batch methanogenic experiments using feces and urine as the substrate.

[0035] Using the source-separated feces and urine and water mixture recovered from the source-separated toilet as the substrate, the anaerobic digested sludge in the stable operation of the feces and urine anaerobic digestion reactor was used as the inoculum, and batch anaerobic methanogenesis experiments were carried out in 500mL serum bottles .

[0036] Then add iron-nickel hydroxyl complex, wherein the molar ratio of Fe(II) to Ni(II) is 100:1, the molar ratio of Fe(II) to hydroxyl is 1:2, and the dosage is 1000mg / L. At the same time, a control group without iron-nickel hydroxyl complex and a blank group with only inoculum were set up to eliminate the influence of inoculum.

[0037] The experiment was carried out in an air bath at 35°C and a shaker at 120r / min. During the experim...

Embodiment 3

[0046] The purpose of this example is to implement a method for strengthening the anaerobic digestion of feces and urine in batch methanogenic experiments using feces and urine as the substrate.

[0047] Using the source-separated feces and urine and water mixture recovered from the source-separated toilet as the substrate, the anaerobic digested sludge in the stable operation of the feces and urine anaerobic digestion reactor was used as the inoculum, and batch anaerobic methanogenesis experiments were carried out in 500mL serum bottles .

[0048] Then add iron-nickel hydroxyl complex, wherein the molar ratio of Fe(II) to Ni(II) is 150:1, the molar ratio of Fe(II) to hydroxyl is 1:1, and the dosage is 500mg / L. At the same time, a control group without iron-nickel hydroxyl complex and a blank group with only inoculum were set up to eliminate the influence of inoculum.

[0049] The program was carried out in an air bath at 35°C and a shaker at 150r / min. During the experiment, pH...

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Abstract

The invention relates to a method for strengthening anaerobic digestion of rural toilet excrement, which comprises the following steps: adding an iron-nickel hydroxyl complex into a reactor of a rural toilet excrement anaerobic digestion system, and then carrying out anaerobic digestion reaction. Compared with the prior art, the method of adding the iron-nickel hydroxyl complex is adopted, the problems of ammonia nitrogen inhibition, slow hydrolytic acidification rate and the like in the anaerobic digestion process of rural toilet excrement are solved; and the methane yield of an anaerobic digestion system is promoted and the organic load of the system is improved by improving the anaerobic digestion environment, improving the microbial activity of the system and exerting the iron-nickel synergistic effect.

Description

technical field [0001] The invention belongs to the technical field of excrement treatment in rural toilets, and relates to a method for strengthening anaerobic digestion of excrement in rural toilets. Background technique [0002] Traditional rural toilet manure is treated in a simple way. It is directly used for fertilization on farmland after simple collection, or it is not treated at all and directly discharged into the natural environment. Human excrement has a large amount of excretion and high nutrient content, and is one of the important sources of environmental pollutants. At the same time, feces contain a large number of pathogenic bacteria, and improper handling can easily lead to the prevalence of intestinal infectious diseases, parasitic diseases and schistosomiasis. At present, the treatment methods of source-separated manure mainly include anaerobic digestion and aerobic composting. Among them, anaerobic digestion technology can use the organic matter in it ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F11/04C02F3/28C02F101/30
CPCC02F11/04C02F3/2893C02F2103/005C02F2305/06C02F2101/30Y02E50/30
Inventor 吴德礼黄涛刘志刚戴晓虎
Owner TONGJI UNIV
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