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Method for preparing composite passivator for soil heavy metals from kitchen waste

A technology of kitchen waste and passivation agent, which is applied in chemical instruments and methods, restoration of polluted soil, soil conditioning materials, etc., can solve problems such as difficult targets, negative impact on soil environment, and difficulty of passivation agent materials, etc. Achieve the effect of low production cost, good passivation effect and good passivation effect

Inactive Publication Date: 2020-04-10
四川长虹格润环保科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The main reason is that the food waste fermentation product needs to have high heavy metal adsorption performance as a heavy metal passivator formula material, while the conventional single food waste organic matter fermentation product is difficult to achieve the target, and generally can only be used as fertilizer after fermentation. Moreover, the fermentation products of food waste usually contain high levels of salt and other harmful substances. Excessive use will easily have a negative impact on the soil environment, and it is difficult to make passivator materials.

Method used

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  • Method for preparing composite passivator for soil heavy metals from kitchen waste
  • Method for preparing composite passivator for soil heavy metals from kitchen waste
  • Method for preparing composite passivator for soil heavy metals from kitchen waste

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Take low-fat food waste and lignite powder in a ratio of 1:1 and ferment according to the above-mentioned preparation method, and then configure T1 with calcium oxide and calcium-based bentonite respectively according to the following mass ratio (fermentation product: calcium oxide: calcium-based bentonite = 20:35:45), T2 (fermentation product: calcium oxide: calcium-based bentonite = 35:30:35), T3 (fermentation product: calcium oxide: calcium-based bentonite = 30:45:25), according to 1.60g / kg The application and cadmium-contaminated soil, in which CK is no passivation agent, the results of the reduction rate of soil effective cadmium content obtained by the application of different passivation agent formulations are shown in Table 1.

[0035] Table 1 Effects of different ratios of passivators on soil available cadmium content

[0036]

[0037] It can be seen from the above table that the formula T3 has a reduction rate of 24% for the effective content of cadmium in ...

Embodiment 2

[0039] Take low-fat food waste and lignite powder in a ratio of 1:1.25 and ferment according to the above-mentioned preparation method, and then configure F1 with calcium oxide and calcium-based bentonite respectively according to the following mass ratio (fermentation product: calcium oxide: calcium-based bentonite = 20:35:45), F2 (fermentation product: calcium oxide: calcium-based bentonite = 35:30:35), F3 (fermentation product: calcium oxide: calcium-based bentonite = 30:45:25), according to 1.60g / kg The application and cadmium-contaminated soil, in which CK is no passivation agent, the results of the reduction rate of soil effective cadmium content obtained by the application of different passivation agent formulations are shown in Table 2.

[0040] Table 2 Effects of different ratios of passivators on soil available cadmium content

[0041]

[0042] It can be seen from the above table that the formula F3 has a reduction rate of 32% for the effective content of cadmium ...

Embodiment 3

[0044] Take low-fat food waste and lignite powder in a ratio of 1:1.25 and ferment according to the above preparation method, then mix with calcium oxide and calcium-based bentonite according to the following mass ratio of 30:45:20, and apply 0g / kg to the target soil respectively , 0.56g / kg, 1.60g / kg, 2.10g / kg, the results of different application rates on the reduction rate of soil available cadmium content are shown in Table 3.

[0045] Table 3 Effects of different passivating agent application rates on soil available cadmium content

[0046]

[0047]It can be seen from the above table that when the application rate of the passivator is 1.60g / kg, a good effect is obtained, and the content of available cadmium in the soil is reduced by 29%.

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Abstract

The invention relates to a method for preparing a composite passivator for soil heavy metals from kitchen waste, belonging to the technical field of treatment of soil heavy metal pollution. The preparation method comprises the following steps: a, fermentation preparation: uniformly mixing kitchen waste, lignite powder and sawdust in proportion, and adjusting a carbon-nitrogen ratio of the formed mixture to obtain a fermentation material; b, preparation of a fermentation product: placing the fermentation material in a fermentation box for natural fermentation, turning a pile when a certain temperature is reached, and continuing fermentation until the pile becomes black brown and has no peculiar smell so as to obtain the fermentation product; and c, compounding of a passivator: mixing the fermentation product with calcium oxide and bentonite according to a certain weight ratio, and carrying out uniform mixing under stirring to obtain the composite passivator. The fermentation product ishigh in humification coefficient and is beneficial for improving the adsorption performance of the composite passivator to heavy metals; and the composite passivator is simple in formula composition and low in manufacturing cost, and can produce a good passivation effect under the condition that the usage amount of the composite passivator is low.

Description

technical field [0001] The invention belongs to the technical field of soil heavy metal pollution control, and specifically relates to a method for preparing a soil heavy metal compound passivator by using kitchen waste, more specifically, a method for preparing a heavy metal cadmium passivator by using food waste composting products. Background technique [0002] In urban domestic waste, kitchen waste accounts for about 30%-45%, which is the main substance in urban organic waste. my country produces more than 60 million tons of kitchen waste every year. The rational disposal of kitchen waste has become a common concern in today's society. hotspots. At present, the main treatment methods of food waste are landfill, incineration, biological treatment (fermentation), etc. Among them, biological treatment technology is vigorously promoted as a resource recycling technology. The biological treatment products of food waste can not only be used as fertilizer, but also It can be ma...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K17/40B09C1/08
CPCB09C1/08C09K17/40
Inventor 罗宏基杨毅宇何益李霞
Owner 四川长虹格润环保科技股份有限公司
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