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Method for increasing content of sludge source aromatic amino acid derivative plant growth promoter

A plant growth promotion and amino acid technology is applied in the field of increasing the content of aromatic amino acid derivative plant growth promoters in sludge sources, and can solve the problems of limited sources and the like

Pending Publication Date: 2022-05-27
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, the source of AAAs for the anaerobic digestion process of sludge is limited
Previous studies have shown that heat treatment alone and traditional anaerobic digestion processes, the generation of AAAs by thermochemical hydrolysis of sludge proteins or hydrolysis under anaerobic conditions are extremely limited in improving the growth promotion of sludge-derived aromatic amino acid-derived plants. dosage method

Method used

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  • Method for increasing content of sludge source aromatic amino acid derivative plant growth promoter
  • Method for increasing content of sludge source aromatic amino acid derivative plant growth promoter
  • Method for increasing content of sludge source aromatic amino acid derivative plant growth promoter

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Embodiment 1

[0035] A method for increasing the content of a sludge source aromatic amino acid derivative plant growth promoter, the method comprising the following steps:

[0036] (1) The dewatered sludge is thermally hydrolyzed with hot steam (160°C, 0.50MPa, about 40min) in the thermal hydrolysis tank to promote the dissolution of the organic matter of the sludge and make the quinone groups in the extracellular polymer, etc. Efficient exposure of electron shuttles to up-regulate high-energy metabolic pathways for the production of plant growth promoters;

[0037] (2) The residual sludge after thermal hydrolysis pretreatment is mixed with the inoculated sludge according to the organic matter weight ratio of 2.5:1 and moved into a closed anaerobic digestion equipment, and is carried out by stirring at a medium temperature of 30-40 °C, The anaerobic digestion cycle is less than or equal to 15 days (SRT≤15d);

[0038] (3) The biogas was collected by the gas collection bag, and the change d...

Embodiment 2

[0044] A method for increasing the content of a sludge source aromatic amino acid derivative plant growth promoter, the method comprising the following steps:

[0045] (1) Add 0.02-0.10g / g·TS (TS is the total solid content of the sludge) citric acid to the inoculated sludge, and mix quickly;

[0046] (2) The inoculated sludge mixed with citric acid is filled with nitrogen protective gas and sealed, and shaken at a constant temperature of 35-37°C and 120-150rpm for 16-24h;

[0047] (3) The treated inoculated sludge (CA-IS) was mixed with high organic matter excess sludge according to the organic matter weight ratio of 1:2.6 and moved into a closed anaerobic digestion equipment. The anaerobic digestion period is less than or equal to 15 days (SRT≤15d), and liquid phase two-stage mass spectrometry and gas mass spectrometry methods are used to quantitatively detect the growth-promoting dose of aromatic amino acid-derived plants per unit of organic matter;

[0048] (4) Select the ...

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Abstract

The invention relates to a method for increasing the content of a sludge source aromatic amino acid derivative plant growth promoter, which comprises the following steps: (1) sludge pretreatment: treating residual sludge or inoculated sludge through one or more of physical, chemical or biological means, the dissolution of carbohydrates in the excess sludge or inoculated sludge is promoted, and the exposure of electron shuttles is promoted; and (2) anaerobic digestion: mixing the pretreated excess sludge or inoculated sludge with unpretreated inoculated sludge or excess sludge, transferring the mixture into closed anaerobic digestion equipment, carrying out anaerobic digestion in a stirring manner, and collecting a finished product. Compared with the prior art, the method has the advantages that the reaction time can be shortened while higher sludge degradation rate and accumulated methane yield are achieved, the yield of the aromatic amino acid derived plant growth promoter is directionally improved, and a promising technical development strategy is provided for producing sludge liquid fertilizer with high additional value.

Description

technical field [0001] The invention relates to the field of sludge resource utilization, in particular to a method for increasing the content of a sludge source aromatic amino acid derivative plant growth promoter. Background technique [0002] Anaerobic digestion (AD) of sludge is a widely used method to degrade perishable organic matter and recover biomass energy (methane). In order to improve the efficiency of AD, thermal hydrolysis pretreatment (THP) technology is one of the most commonly used methods, which can improve the biodegradability of sludge, reduce sludge viscosity, and inactivate pathogens. It has been reported that THP at 121 °C can lead to the destruction of biopolymers and the massive release of soluble carbohydrates in the sludge. When THP is performed at high temperature over 150 °C, the soluble organic matter in the sludge can be further hydrolyzed into bioavailable forms, such as glucose and amino acids. The increased soluble organic matter may be di...

Claims

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Application Information

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IPC IPC(8): C12P7/42C12P7/40C12P17/10C02F11/04
CPCC12P7/42C12P7/40C12P17/10C02F11/04Y02E50/30
Inventor 唐燕飞孙婧戴晓虎
Owner TONGJI UNIV