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

A technology for incinerating fly ash and fermentation liquid, applied in the removal of solid waste, climate change adaptation, etc., can solve the problems of high price of pure acid liquid, restricting industrial applications, etc., and achieve water saving, high economic benefits, environmental protection Benefit-important effect

Active Publication Date: 2019-06-21
UNIV OF SCI & TECH BEIJING
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  • Description
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  • 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 by using organic mixed garbage fermentation liquid
  • Method for removing chlorine and heavy metals in incineration fly ash by using organic mixed garbage fermentation liquid
  • Method for removing chlorine and heavy metals in incineration fly ash by using organic mixed garbage fermentation liquid

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preparation example Construction

[0022] Preparation of lactic acid fermentation broth:

[0023] (1) Strain activation: Take the cryopreservation tube containing Enterococcus faecium stored at -70°C out of the refrigerator and immediately place it in a water bath at about 38°C until the ice inside the cryopreservation tube is completely dissolved. The bacterial solution was inserted into the sterilized MRS liquid medium at an inoculation ratio of 10%, and incubated at a constant temperature of 150r / 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 new MRS liquid medium at an inoculation ratio of 10% (w / w), and cultivate it at a constant temperature of 150r / min at 37°C for 12 Hour.

[0025] (3) Lactic acid fermentation: the mixture of organic mixed garbage (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 li...

Embodiment 1

[0028] Investigate the production of lactic acid in the process of single fermentation and mixed fermentation of kitchen waste, fruit and vegetable waste. The fermentation process is as described above, and the fermentation substrates are divided into 9 types, which are: ① Food waste (wet weight): water = 1:2 (w / w) ② Food 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)⑨organic mixed garbage (wet weight): water = 1:0 (w / w), of which organic mixed garbage is kitchen waste and fruit and vegetable waste by dry weight The ratio is 1:1 mixed. Inoculate 10% Enterococcus faecium, and ferment anaerobically at 37°C for 4 days. Unit lactic acid yield (g / g (dry w...

Embodiment 2

[0033]Take 15g of dried incineration fly ash and place it in a 250mL conical flask, and add 150mL of organic mixed waste lactic acid fermentation liquid (the concentration of lactic acid in the fermentation liquid is 25.5 g / L) and then sealed, reacted for 120 min under the conditions of a temperature of 25° C. and a rotational speed of 150 rpm, and then centrifuged. The chlorine content in the supernatant was measured by ion chromatography, and it was concluded that 93.1% of the chlorine in the fly ash could be extracted by the organic mixed garbage lactic acid fermentation liquid under this condition.

[0034] Embodiment 2-10 is listed in the following table, and all the other conditions are the same as embodiment 1.

[0035]

[0036]

[0037] Through the comparison of Example 2 and Comparative Example 1, it can be found that under the same amount of water, using lactic acid fermentation liquid to carry out bioleaching of incineration fly ash can greatly increase the le...

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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 waste fermentation liquid, and belongs to the field of solid waste treatment anddisposal. Because kitchen waste is rich in protein and prone to souring and rotting, fruit and vegetable waste is rich in cellulose and hemicelluloses, the starting time is long, the synergistic fermentation of the kitchen waste and the fruit and vegetable waste can balance the nutrient ratio of raw materials. The organic acid fermentation liquid produced by fermentation can be used for bioleaching chlorine and heavy metal elements in fly ash. The method comprises the specific processes that the dried fly ash and the fermentation liquid are mixed uniformly according to the ratio of dried flyash to fermentation liquid is 1: 1-1: 20 (g / mL), and oscillation is carried out in a constant temperature mode at 25-55 DEG C for 30-180 min. The method is simple to operate, safe, efficient, economical and feasible, and is an environmentally friendly method for removing the chlorine and heavy metals in the fly ash.

Description

technical field [0001] The invention relates to a detoxification and harmless treatment technology for hazardous waste, which belongs to the field of solid waste treatment and disposal. Background technique [0002] With the continuous acceleration of my country's urbanization process, the output of municipal solid waste is also increasing continuously. According to data from China Statistical Yearbook, as of 2014, the annual volume of municipal solid waste in my country has reached 178.6 million tons, of which about 50% is kitchen and fruit and vegetable waste, which greatly limits the development of cities. Because these organic domestic wastes have the characteristics of high water content, low calorific value, perishability, high content of organic matter, high content of oil and salt, and high types and contents of heavy metals, the current municipal solid waste treatment processes on the market are all There are many problems. The high organic matter content causes t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09B3/00
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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