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Method for removing chlorine and heavy metals in incineration fly ash with organic mixed garbage fermentation liquid

A technology for incinerating fly ash and fermentation liquid, applied in chemical instruments and methods, transportation and packaging, solid waste removal, etc., can solve the problems of limited industrial application, high price of pure acid, etc., to save water, High economic benefit, important effect of environmental benefit

Active Publication Date: 2022-06-03
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The high price of pure acid limits its industrial application

Method used

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  • Method for removing chlorine and heavy metals in incineration fly ash with organic mixed garbage fermentation liquid
  • Method for removing chlorine and heavy metals in incineration fly ash with organic mixed garbage fermentation liquid
  • Method for removing chlorine and heavy metals in incineration fly ash with organic mixed garbage fermentation liquid

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Experimental program
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Effect test

preparation example Construction

[0022] Preparation of lactic acid fermentation broth:

[0023] (1) Activation of strains: Take the cryotube containing Enterococcus faecium stored at -70°C out of the refrigerator and place it in a water bath at about 38°C immediately, until all the ice inside the cryotube is dissolved. The bacterial solution was inserted into the sterilized MRS liquid medium at the inoculation ratio of 10%, and was incubated at a constant temperature of 150 r / min at 37° C. for 24 hours to complete the activation.

[0024] (2) Preparation of seed solution: take a certain amount of activated bacterial solution and insert it into a new MRS liquid medium at an inoculation ratio of 10% (w / w), and cultivate at a constant temperature of 150 r / min and 37 ° C for 12 Hour.

[0025] (3) Lactic acid fermentation: the mixture obtained by mixing organic mixed waste (wet weight) and water in a mass ratio of 1:0-1:2 is the fermentation substrate, inoculated with 2%-15% (w / w) Enterococcus faecium seed liqui...

Embodiment 1

[0028] The production of lactic acid in the process of single fermentation and mixed fermentation of kitchen waste and fruit and vegetable waste was investigated. The fermentation process is as described above, and the fermentation substrates are divided into 9 types: ①Food waste (wet weight): water=1:2 (w / w) ②Food waste (wet weight): water=1:1 (w / w) ③ Food waste (wet weight): water = 1:0 (w / w) ④ Fruit and vegetable waste (wet weight): water = 1:2 (w / w) ⑤ Fruit and vegetable waste (wet weight): Water = 1: 1 (w / w) ⑥ Fruit and vegetable waste (wet weight): Water = 1: 0 (w / w) ⑦ Organic mixed waste (wet weight): Water = 1: 2 (w / w) ⑧ Organic mixed Garbage (wet weight): water = 1:1 (w / w) ⑨ Organic mixed waste (wet weight): water = 1:0 (w / w), of which organic mixed waste is kitchen waste and fruit and vegetable waste by dry weight The ratio is 1:1 mixed. 10% Enterococcus faecium was inoculated and anaerobic fermentation was carried out at 37°C for 4 days. Unit lactate production (...

Embodiment 2

[0033]Get 15g of dried incineration fly ash and place it in a 250mL conical flask, adopt the ratio of ash to liquid to be 1:10, add 150mL of organic mixed garbage lactic acid fermentation broth (the lactic acid concentration in the fermentation broth is 25.5 g / L), then sealed, reacted for 120 min at a temperature of 25° C. and a rotating speed of 150 rpm, and then centrifuged. The chlorine content in the supernatant was determined by ion chromatography, and it was concluded that 93.1% of the chlorine in the fly ash could be leached from the organic mixed waste lactic acid fermentation broth under this condition.

[0034] Examples 2-10 are listed in the following table, and the remaining conditions are the same as those of Example 1.

[0035]

[0036]

[0037] From the comparison between Example 2 and Comparative Example 1, it can be found that, under the same water consumption, using lactic acid fermentation broth to carry out bioleaching of incineration fly ash can grea...

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Abstract

The invention relates to a method for removing chlorine and heavy metals in incineration fly ash by using organic mixed garbage fermentation liquid, belonging to the field of solid waste treatment and disposal. Since food waste is rich in protein and is easy to rot, fruit and vegetable waste is rich in cellulose and hemicellulose, which takes a long time to start. The synergistic fermentation of the two can make the nutritional ratio of raw materials balance. Organic acid fermented liquid produced by fermentation can be used to bioleach chlorine and heavy metal elements in fly ash. The specific process is: mix the dried fly ash and fermented liquid evenly at a ratio of 1:1-1:20 (g / mL) to the ash-to-liquid ratio, and shake at a constant temperature of 25-55°C for 30-180 minutes. . The method is simple, safe, efficient and economically feasible, and is an environmentally friendly method for removing chlorine and heavy metals in fly ash.

Description

technical field [0001] The invention relates to a detoxification and harmless treatment technology for hazardous wastes, belonging to the field of solid waste treatment and disposal. Background technique [0002] With the continuous acceleration of urbanization in my country, the output of municipal solid waste is also increasing. According to the China Statistical Yearbook, as of 2014, the annual volume of urban domestic waste in my country has reached 178.6 million tons, of which about 50% is kitchen, fruit and vegetable waste, which greatly limits the development of cities. Due to the high moisture content and low calorific value of these organic domestic wastes; perishable; high organic content; high oil and salt content; There are many problems. High organic matter content causes secondary pollution such as foul odor and leachate in the landfill process, which seriously endangers the surrounding environment and groundwater sources. The high water content results in t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B09B3/60B09B3/80B09B101/70B09B101/30
CPCY02A40/20
Inventor 汪群慧王晓娜吴川福王梦璐邹德志高明
Owner UNIV OF SCI & TECH BEIJING
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