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A kind of processing technology of leather solid waste

A technology of solid waste and treatment process, which is applied in the direction of solid waste removal, etc., and can solve problems such as not being able to grow well

Active Publication Date: 2021-05-07
AGRI PRODS PROCESSING RES INST CHINESE ACAD OF TROPICAL AGRI SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the current reports, there is no microalgae species that has a good adsorption effect on hexavalent chromium. Chlorella, Synechococcus, Spirulina, crescent algae, Scenedesmus, etc. not growing well
These treatment methods are all aimed at the treatment of hexavalent chromium in liquid, but there are no related reports on the treatment of hexavalent chromium in solid waste

Method used

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  • A kind of processing technology of leather solid waste
  • A kind of processing technology of leather solid waste

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] 1) Decalcification: soak 4.2kg of cured leather waste in 10L of 1wv% ammonium chloride solution for 5 hours, remove, rinse with 40L of water, and dry;

[0050] 2) Pulverization: pulverize the solid waste after decalcification in step 1) to a particle size of ≤0.25 cm to obtain powdery waste;

[0051] 3) Biological enzymatic hydrolysis: fill carbonic acid into deionized water to make pH = 3.5 to obtain a carbonic acid solvent, add 7 kg of the carbonic acid solvent to 1 kg of powdery waste, add 0.7 g of cysteine ​​and stir, add 8.82 kU hydrolyze with cellulase at 30°C for 2h; add carbonic acid to each carbonic acid solution until the pH is 3.5, add 3.5kU of bromelain to hydrolyze at 30°C for 0.5h; add sodium carbonate to adjust the pH to 8.3, then add 8.4kU of lipase Enzymolysis at 30°C for 2 hours to obtain the enzymatic hydrolysis solution;

[0052] 4) Microalgae preplanting: culture Euglena gracilis in 50mL Hunter trace element culture medium, insert 0.5×10 9 Cells o...

Embodiment 2

[0055] 1) Decalcification: immerse 4.45kg of cured leather waste in 10L of 1.5wv% ammonium chloride solution for 5 hours, remove, rinse with 40L of water, and dry;

[0056] 2) Pulverization: pulverize the solid waste after decalcification in step 1) to a particle size of ≤0.25 cm to obtain powdery waste;

[0057] 3) Biological enzymolysis: fill carbonic acid into deionized water to make pH = 4.5 to obtain a carbonic acid solvent, add 8 kg of the carbonic acid solvent to 1 kg of powdery waste, stir after adding 0.9 g of cysteine, add 24 kU of Cellulase, enzymatic hydrolysis at 30°C for 2h; add carbonic acid to each carbonic acid solution to pH 4.5, add 80kU bromelain at 30°C for 0.5h; add sodium carbonate to adjust the pH to 8.3, add 48kU lipase at 30°C Decompose for 2 hours to obtain the enzymatic solution;

[0058] 4) Microalgae preplanting: culture Euglena gracilis in 100mL Hunter trace element culture medium, insert 1×10 9 Cells of Euglena cellulosus, after culturing for ...

Embodiment 3

[0061] 1) Decalcification: soak 4.0kg of cured leather waste in 10L of 2wv% ammonium chloride solution for 5 hours, remove, rinse with 40L of water, and dry;

[0062] 2) Pulverization: pulverize the solid waste after decalcification in step 1) to a particle size of ≤0.25 cm to obtain powdery waste;

[0063] 3) Biological enzymolysis: fill carbonic acid into deionized water to make pH=5.5 to obtain a carbonic acid solvent, add 10 kg of the carbonic acid solvent to 1 kg of powdery waste, stir after adding 1.2 g of cysteine, add 70 kU of Cellulase, enzymatic hydrolysis at 30°C for 2h; add carbonic acid to each carbonic acid solution to pH 5.5, add 120kU bromelain at 30°C for 0.5h; add sodium carbonate to adjust the pH to 8.0, add 78kU lipase at 30°C Decompose for 2 hours to obtain the enzymatic solution;

[0064] 4) Microalgae preplanting: culture Euglena gracilis in 150mL Hunter trace element culture medium, insert 1×10 9 Cells of Euglena cellulosus, after cultivating for 3 da...

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Abstract

The invention discloses a process for treating leather solid waste, which comprises the following steps: 1) using ammonium chloride to remove calcium, 2) pulverizing, 3) successively undergoing cellulase enzymolysis, protease enzymolysis, lipase enzymolysis, 4) ) microalgae preplanting and 5) microalgae feeding. The treatment process effectively utilizes the nutrient substances of leather curing waste as carbon and nitrogen sources for the growth of microalgae, and utilizes the biosolidification and biodegradation of microalgae to effectively reduce the content of hexavalent chromium in the waste.

Description

technical field [0001] The invention relates to the technical field of industrial waste treatment, in particular to a treatment process for leather solid waste. Background technique [0002] With the rapid development of my country's industrial economy, it inevitably brings huge environmental pollution problems. The pollution sources include heavy metals, waste water, waste residue, dust particles, etc., resulting in a significant decline in soil, water and air quality. Soil and water pollution first attracted people's attention, because these pollutions are visible to the naked eye; air pollution has also become well known in recent years, and the concept of PM2.5 is deeply rooted in the hearts of the people. Only heavy metal pollution, because of its long incubation period and lack of popularization of relevant knowledge, has not attracted widespread public attention. [0003] Heavy metal pollution is actually a problem that can no longer be ignored and will bring serious...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B09B3/00B09B5/00
CPCB09B3/00B09B5/00
Inventor 李积华韩志萍周伟王飞曹玉坡李亚会李贵丽
Owner AGRI PRODS PROCESSING RES INST CHINESE ACAD OF TROPICAL AGRI SCI