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Method for treating heavy metal in organic waste through self-heating type aerobic fermentation

A technology of organic waste and aerobic fermentation, applied in the direction of sludge treatment, biological sludge treatment, chemical instruments and methods, etc., can solve the problem of inability to degrade or treat heavy metals in organic waste, affect the quality and treatment effect of fermentation products, and energy conversion efficiency Low-level problems, to achieve the effect of strengthening half-life and microbial activity, promoting aerobic fermentation efficiency, simple process and energy saving

Pending Publication Date: 2022-07-22
KUNMING UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Problems of common fermentation technology at present: ①The production takes a long time and the efficiency is low. The raw material pretreatment before fermentation and the moisture content, carbon-nitrogen ratio, pH and oxygen content in the fermentation process all affect the start-up and fermentation cycle. How to effectively shorten the fermentation period under low-cost conditions is still a problem in practical application; ② Traditional fermentation methods cannot completely degrade or treat heavy metals in organic waste, which affects the quality and treatment effect of fermentation products
Most of the fermentation raw materials contain heavy metals, and the energy conversion efficiency is low. The effect of direct anaerobic fermentation of organic wastes containing a large amount of heavy metals is not ideal, and the heavy metals in the fermented products are difficult to meet the standard. Therefore, the rapid removal of heavy metals in organic wastes should be strengthened to improve organic waste resources. Utilization is an urgent problem to be solved

Method used

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  • Method for treating heavy metal in organic waste through self-heating type aerobic fermentation
  • Method for treating heavy metal in organic waste through self-heating type aerobic fermentation
  • Method for treating heavy metal in organic waste through self-heating type aerobic fermentation

Examples

Experimental program
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Effect test

Embodiment 1

[0023] Embodiment 1: The self-heating aerobic fermentation method treats the residual activated sludge of the sewage treatment plant, and the specific operation is as follows:

[0024] like figure 1 As shown, the device used in the embodiment includes a reactor 2, the height of the reactor is 2.0m, the length is 2.0m, the width is 2.0m, the anode 4 and the cathode 5 are arranged in the reactor, the distance between the cathode and the anode is 1.0m, and the cathode 5 It is connected with the motor 3 set at the top of the reactor, the feed port 10 is set at the top of the reactor, the discharge port 6 is set at the bottom of the reactor, and 15 microporous aerators 8 (each microporous aerator is aerated) The area is 0.4m 2 ) at the bottom of the reactor and communicated with the air pump 9, the overflow weir 7 is arranged on the top of the reactor, the anode and the cathode are respectively connected with the DC power supply 1; the cathode is an electrode with a plurality of g...

Embodiment 2

[0033] Embodiment 2: self-heating type aerobic fermentation method handles cattle and sheep manure, and concrete operation is as follows:

[0034] The device used in this example is the same as that in Example 1, except that the graphite mesh pole pieces are provided with 2 layers, with 5 pieces in each layer; the anode is an electrode with a plurality of nickel oxide pole pieces on the shaft, and the nickel oxide pole piece pole piece Set 2 layers, 5 pieces per layer; set 20 microporous aerators, and the aeration area of ​​each microporous aerator is 0.2m 2 ;

[0035] The nickel oxide pole piece is immersed in a hydrochloric acid solution with a concentration of 25g / L, and then taken out after ultrasonication for 12 minutes, and then placed in a mixture of ethanol and acetone with a volume ratio of 1:1 to continue ultrasonication for 12 minutes, and vacuum dried at 90 °C for 19 hours. After placing it in a cobalt chloride solution with a concentration of 125 g / L, the current...

Embodiment 3

[0043] Embodiment 3: the self-heating aerobic fermentation method handles the kitchen waste, and the concrete operation is as follows:

[0044] The device used in this example is the same as that in Example 1, except that the graphite mesh pole pieces are provided with 2 layers, with 6 pieces in each layer; the anode is an electrode with a plurality of nickel oxide pole pieces on the shaft, and the nickel oxide pole piece pole piece Set 2 layers, 6 pieces per layer; set 10 microporous aerators, and the aeration area of ​​each microporous aerator is 0.5m 2 ;

[0045] The nickel oxide pole piece is immersed in a hydrochloric acid solution with a concentration of 30g / L, and then taken out after ultrasonication for 15 minutes, and then placed in a mixture of ethanol and acetone with a volume ratio of 1:1 for more than 8 minutes, and vacuum dried at 100 °C for 18 hours. Then, it was placed in a cobalt chloride solution with a concentration of 100 g / L, and the current density of 40...

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Abstract

The invention discloses a method for treating heavy metals in organic wastes by self-heating aerobic fermentation, which comprises the following steps: by taking the organic wastes as fermentation raw materials, adding the organic wastes into a fermentation reactor after pretreatment, arranging more than one group of cathodes and anodes in the reactor, an electric field is applied to the pretreated fermentation raw materials, rotation of a cathode drives the fermentation raw materials to circularly flow, oxygen is separated out from an anode, the oxygen content is increased, the pH is reduced, a large number of free radicals are generated, and the aerobic fermentation reaction is promoted; due to the rotation of the cathode, the pole pieces on the anode and the cathode are alternately changed in parallel and in a staggered manner, so that pulse current is generated, a magnetic field is generated by a variable electric field, and meanwhile, continuous aeration is applied to drive the fermentation raw materials to circularly flow, so that the organic wastes rich in heavy metals are kept in a suspended state; the reactor reaches a continuous self-heating state due to the heat effect of the current, so that the removal and enrichment of heavy metals in the organic wastes are realized; the method has the advantages of high heavy metal electric trapping rate, short fermentation period, simplicity in operation, high product resource utilization rate and the like.

Description

technical field [0001] The invention relates to a method and a device for treating heavy metals in organic wastes by autothermal aerobic fermentation, which realizes the separation, removal, enrichment and recovery of heavy metals in organic wastes, and belongs to the field of resource utilization of organic wastes. Background technique [0002] According to official data from the Ministry of Agriculture, the annual production of aquaculture waste in the country in 2019 was about 3.8 billion tons, and it is expected to reach 6.02 billion tons by 2025. In 2019, my country's sludge output has exceeded 60 million tons, and it is expected that my country's annual sludge output will exceed 90 million tons in 2025. The above-mentioned organic wastes have both resource characteristics and pollution characteristics. Among them, pollution (especially heavy metal pollution) is the biggest obstacle restricting the land use of organic solid wastes. The reduction and treatment of heavy ...

Claims

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Application Information

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IPC IPC(8): C02F11/00C02F11/02
CPCC02F11/006C02F11/02
Inventor 李军燕邹红梅瞿广飞蔡营营胡英辉
Owner KUNMING UNIV OF SCI & TECH
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