A process for accelerating the degradation stabilization of a landfill

Abstract

The present application relates to a kind of processes for accelerating waste landfill degradation stabilization, the present application scheme is by simultaneously existing through biological degradation, photodegradation and chemical degradation three degradation modes, play the role of mutual promotion, while realizing the rapid stabilization treatment of garbage, can improve landfill capacity and realize cyclic landfill, the process includes the following steps: 1) preparation of accelerated degradation reagent;2) preheating percolate is added to accelerated degradation reagent and is mixed, to prepare spraying mixed solution;3) after spraying mixed solution is sprayed in the surface or inside of landfill garbage heap, stirring is mixed;4) adjust the environmental parameters of landfill garbage;5) after a period of time, secondary spraying is carried out to landfill garbage;The accelerated degradation reagent includes the following components: titanium dioxide, sodium chloride, phosphate, carboxylate, calcium carbonate, bentonite, enzyme, polycarboxylate and organic peroxide, the mass ratio of titanium dioxide and sodium chloride is 1:1-2;Belong to the technical field of comprehensive utilization of municipal solid waste.

Description

Technical Field

[0001] This invention belongs to the technical field of comprehensive utilization of urban and rural domestic waste, and relates to a process for accelerating the degradation and stabilization of landfill waste. Background Technology

[0002] Landfills, due to the large accumulation of municipal solid waste, create anaerobic environments that lead to the accumulation of large amounts of foul-smelling gases (or flammable and explosive gases) such as methane and hydrogen sulfide. Before reaching a stable state after 10 years of landfilling, direct excavation can easily result in poisoning or explosions. Furthermore, some waste, due to its unique composition, cannot decompose naturally and accumulates in the atmosphere, soil, and water sources, causing pollution problems.

[0003] Therefore, it is necessary to accelerate the decomposition and treatment of household waste. Biodegradation, which utilizes biological metabolic mechanisms such as microorganisms to break down waste into harmless organic matter, is a highly effective method. For example, using biomass materials such as peat and reeds to construct biological filtration layers for treating domestic sewage can effectively degrade organic pollutants, enabling sewage purification to meet standards.

[0004] Photodegradation refers to the use of light and photochemical reactions to break down pollutants into non-toxic and harmless substances. For example, using ultraviolet light to treat pollutants in water and air can greatly improve the efficiency of pollutant degradation.

[0005] In addition, chemical degradation technology can also accelerate the waste treatment process. Currently, methods such as chemical reduction and oxidation can convert harmful substances in waste into harmless substances. Using this method to treat harmful substances in waste can improve the decomposition efficiency of pollutants and reduce environmental harm.

[0006] Therefore, improving waste management methods can achieve rapid stabilization of waste by enhancing the rates of the three degradation mechanisms: biodegradation, photodegradation, and chemical degradation. Summary of the Invention

[0007] The purpose of this invention is to provide a process for accelerating the degradation and stabilization of landfill waste. The invention utilizes three degradation methods—biodegradation, photodegradation, and chemical degradation—to simultaneously promote each other, thereby achieving rapid stabilization of waste, increasing landfill capacity, and enabling cyclic landfilling.

[0008] The objective of this invention can be achieved through the following technical solutions:

[0009] A process for accelerating the degradation and stabilization of landfill waste, the process comprising the following steps:

[0010] 1) Preparation of accelerated degradation reagents;

[0011] 2) Preheat the leachate, add the accelerated degradation reagent and mix well to obtain the spray mixture;

[0012] 3) After spraying the spray mixture onto the surface or interior of the landfill waste, stir and mix thoroughly;

[0013] 4) Adjust the ambient humidity, temperature, oxygen concentration, moisture content, and pH value of landfill waste;

[0014] 5) After a period of time, the landfill waste is sprayed a second time.

[0015] As a preferred embodiment of the present invention, in step 2), the preheating temperature is 30-40°C, and the mass ratio of the accelerated degradation reagent to the leachate is 3-8:1500.

[0016] As a preferred technical solution of the present invention, in step 3), the mass ratio of the spray mixture to the landfill waste is 1:5-7; in step 3), the present invention adopts a method of spraying the spray mixture on the surface or inside the landfill waste pile and mixing it evenly. In particular, for waste piles with BDM (biodegradable matter) greater than 5%, the present invention can spray the spray mixture inside the waste pile, and the internal environment of the waste pile, together with the landfill equipment and measures, can make it achieve the indicators in step 4) below.

[0017] As a preferred embodiment of the present invention, in step 4), the ambient humidity is 70-80%, the ambient temperature is 25-30℃, the oxygen concentration is 16-21%, the moisture content is 40-60%, and the pH value is 6.5-7.5.

[0018] As a preferred embodiment of the present invention, the interval is 25-30 days.

[0019] This invention discloses a formulation for an accelerated degradation reagent, which comprises the following components by weight: 5-10 parts titanium dioxide, 10-20 parts sodium chloride, 2-3 parts phosphates, 1-2 parts carboxylates, 3-4 parts calcium carbonate, 3-5 parts bentonite, 0.5-1 part enzyme, 3-5 parts polycarboxylates, and 0.2-0.5 parts organic peroxides.

[0020] The mass ratio of titanium dioxide to sodium chloride is 1:1-2;

[0021] Titanium dioxide and sodium chloride can mutually promote contact with organic matter in waste and trigger photochemical reactions, thereby promoting the oxidative decomposition of organic matter; in the present invention, the titanium dioxide used is nano-sized titanium dioxide.

[0022] Phosphates: can accelerate the decomposition of organic matter in waste, while reducing the loss of nutrients such as nitrogen and phosphorus in waste;

[0023] Carboxylates: have deodorizing properties and can accelerate the decomposition of organic matter in waste;

[0024] Calcium carbonate: can neutralize acidic substances in waste, while improving the physical properties of waste, making it easier to landfill and compact;

[0025] Bentonite: It can increase the air permeability and water retention of waste, promote the growth of microorganisms, and accelerate the decomposition of waste; in the present invention, the bentonite used is nano-sized bentonite.

[0026] Enzymes: Enzymes can accelerate the decomposition and transformation of organic matter and can accelerate the stabilization process of waste;

[0027] Organic peroxides: Organic peroxides can increase oxygen supply and accelerate the oxidative decomposition of organic matter in waste, thereby accelerating waste stabilization;

[0028] Polycarboxylates: Polycarboxylates can increase the moisture content of waste, thereby increasing the activity and metabolic rate of microorganisms, accelerating the decomposition and transformation of waste, and thus accelerating waste stabilization.

[0029] As a preferred embodiment of the present invention, the phosphate is one or more of sodium tripolyphosphate, diammonium hydrogen phosphate, potassium dihydrogen phosphate, and trisodium phosphate.

[0030] As a preferred embodiment of the present invention, the carboxylate is one or more of butyl acetate, sodium benzoate and butyl propionate.

[0031] As a preferred embodiment of the present invention, the enzyme is one or more of amylase, lipase and protease.

[0032] As a preferred embodiment of the present invention, the organic peroxide is di-tert-butyl peroxide.

[0033] In a preferred embodiment of the present invention, the polycarboxylate is sodium polycarboxylate.

[0034] The beneficial effects of this invention are:

[0035] 1. Accelerating degradation agents include titanium dioxide, sodium chloride, phosphates, carboxylates, calcium carbonate, bentonite, enzymes, polycarboxylates, and organic peroxides. These agents can fully bind with various substances. Carboxylates and polycarboxylates can disperse substances, increase the surface area of ​​contact between substances, and facilitate chemical reactions. Phosphates, calcium carbonate, and bentonite can effectively regulate the acid-base balance of the reaction, ensuring the smooth progress of the reaction. In addition, the above components can also serve as good nutrients for microorganisms, promoting microbial degradation reactions.

[0036] 2. Under sunlight, titanium dioxide added to landfill waste absorbs light energy and converts it into electrons and holes, triggering photolysis and generating a large number of free radicals. This promotes the oxidative decomposition of organic matter in the waste. Sodium chloride increases the ion concentration in landfill waste, thereby promoting the photolysis reaction. Under sunlight, sodium ions in sodium chloride absorb light energy and generate electrons and holes. These active ions, along with a large number of free radicals, can mutually promote contact with organic matter in the waste and trigger photochemical reactions, thus promoting the oxidative decomposition of organic matter. Furthermore, sodium chloride can reduce hydrolysis reactions in waste, thereby slowing down the decomposition process in landfills, extending its storage time, and protecting the environment.

[0037] 3. Aged leachate contains a large amount of organic matter and microorganisms. Adding an appropriate amount of aged leachate can increase the speed and effectiveness of waste decomposition.

[0038] 4. The present invention utilizes three degradation methods—biodegradation, photodegradation, and chemical degradation—to simultaneously promote each other, thereby achieving rapid stabilization of waste, increasing landfill capacity, and enabling cyclic landfilling. Detailed Implementation

[0039] To further illustrate the technical means and effects of the present invention in achieving its intended purpose, the following detailed description of the specific implementation methods, structures, features, and effects of the present invention, in conjunction with embodiments, is provided below.

[0040] The landfill and the internal equipment of the waste pile used in this invention are equipped with lighting devices to achieve the light conditions for chemical degradation.

[0041] Example 1

[0042] The accelerated degradation reagent comprises the following components by weight: 10 parts titanium dioxide, 10 parts sodium chloride, 2 parts sodium tripolyphosphate, 1 part sodium benzoate, 3 parts calcium carbonate, 3 parts bentonite, 0.5 parts enzyme, 3 parts sodium polycarboxylate, and 0.25 parts di-tert-butyl peroxide, wherein the mass ratio of titanium dioxide to sodium chloride is 1:1; wherein the enzyme is composed of amylase, lipase, and protease in a 1:1:1 ratio.

[0043] A process for accelerating the degradation and stabilization of landfill waste, the process comprising the following steps:

[0044] 1) Preparation of accelerated degradation reagents;

[0045] 2) The leachate is preheated, and the accelerated degradation reagent is added and mixed evenly to obtain a spray mixture; wherein the preheating temperature is 30°C, and the mass ratio of the accelerated degradation reagent to the leachate is 3:1500.

[0046] 3) After spraying the spray mixture onto the surface of the landfill waste, stir and mix it evenly; wherein, the mass ratio of the spray mixture to the landfill waste is 1:5;

[0047] 4) Adjust the ambient humidity, ambient temperature, oxygen concentration, moisture content and pH value of the landfill waste; wherein the ambient humidity is 70%, the ambient temperature is 25℃, the oxygen concentration is 16%, the moisture content is 40%, and the pH value is 6.5.

[0048] 5) After an interval of 25 days, the landfill waste is sprayed a second time to adjust the ambient temperature to 65℃.

[0049] Example 2

[0050] The accelerated degradation reagent comprises the following components by weight: 7 parts titanium dioxide, 10.5 parts sodium chloride, 2.5 parts sodium tripolyphosphate, 1.5 parts sodium benzoate, 3.5 parts calcium carbonate, 4 parts bentonite, 0.75 parts enzyme, 4.5 parts sodium polycarboxylate, and 0.35 parts di-tert-butyl peroxide, wherein the mass ratio of titanium dioxide to sodium chloride is 1:1.5; and the enzyme is composed of amylase, lipase, and protease in a 1:1:1 ratio.

[0051] A process for accelerating the degradation and stabilization of landfill waste, the process comprising the following steps:

[0052] 1) Preparation of accelerated degradation reagents;

[0053] 2) The leachate is preheated, and the accelerated degradation reagent is added and mixed evenly to obtain a spray mixture; wherein the preheating temperature is 35°C, and the mass ratio of the accelerated degradation reagent to the leachate is 5.5:1500.

[0054] 3) After spraying the spray mixture onto the surface of the landfill waste, stir and mix it evenly; wherein, the mass ratio of the spray mixture to the landfill waste is 1:6;

[0055] 4) Adjust the ambient humidity, ambient temperature, oxygen concentration, moisture content and pH value of the landfill waste; wherein the ambient humidity is 75%, the ambient temperature is 27.5℃, the oxygen concentration is 18.5%, the moisture content is 50%, and the pH value is 7.

[0056] 5) After an interval of 28 days, the landfill waste is sprayed a second time to adjust the ambient temperature to 68℃.

[0057] Example 3

[0058] The accelerated degradation reagent comprises the following components by weight: 10 parts titanium dioxide, 20 parts sodium chloride, 3 parts sodium tripolyphosphate, 2 parts sodium benzoate, 4 parts calcium carbonate, 5 parts bentonite, 1 part enzyme, 5 parts sodium polycarboxylate, and 0.5 parts di-tert-butyl peroxide, wherein the mass ratio of titanium dioxide to sodium chloride is 1:2; wherein the enzyme is composed of amylase, lipase, and protease in a 1:1:1 ratio.

[0059] A process for accelerating the degradation and stabilization of landfill waste, the process comprising the following steps:

[0060] 1) Preparation of accelerated degradation reagents;

[0061] 2) The leachate is preheated, and the accelerated degradation reagent is added and mixed evenly to obtain a spray mixture; wherein the preheating temperature is 40°C, and the mass ratio of the accelerated degradation reagent to the leachate is 8:1500.

[0062] 3) After spraying the spray mixture onto the surface of the landfill waste, stir and mix it evenly; wherein, the mass ratio of the spray mixture to the landfill waste is 1:7;

[0063] 4) Adjust the ambient humidity, ambient temperature, oxygen concentration, moisture content and pH value of the landfill waste; wherein the ambient humidity is 80%, the ambient temperature is 30℃, the oxygen concentration is 21%, the moisture content is 60%, and the pH value is 7.5.

[0064] 5) After an interval of 30 days, the landfill waste is sprayed a second time to adjust the ambient temperature to 70℃.

[0065] Example 4

[0066] The accelerated degradation reagent comprises the following components by weight: 7 parts titanium dioxide, 14 parts sodium chloride, 2.5 parts sodium tripolyphosphate, 1.5 parts sodium benzoate, 3.5 parts calcium carbonate, 4 parts bentonite, 0.75 parts enzyme, 4.5 parts sodium polycarboxylate, and 0.35 parts di-tert-butyl peroxide, wherein the mass ratio of titanium dioxide to sodium chloride is 1:2; wherein the enzyme is composed of amylase, lipase, and protease in a 1:1:1 ratio.

[0067] Compared with Example 2, the difference is that the sodium chloride in the accelerated degradation reagent is 14 parts, the mass ratio of titanium dioxide to sodium chloride is 1:2, and the remaining components, preparation steps and parameters are the same.

[0068] Comparative Examples 1-4

[0069] Compared with Example 2, the difference lies in the amount of the components of the accelerated degradation reagent: titanium dioxide, sodium chloride, sodium tripolyphosphate, sodium benzoate, calcium carbonate, bentonite and sodium polycarboxylate, as shown in Table 1. The other components, preparation steps and parameters are the same.

[0070] Table 1

[0071]

[0072]

[0073] Comparative Example 5

[0074] Compared with Example 2, the difference is that in step 4), the ambient temperature is adjusted to 50°C, while the other components, preparation steps and parameters are the same.

[0075] Comparative Example 6

[0076] Compared with Example 2, the difference is that in step 4), the oxygen concentration is 9%, while the remaining components, preparation steps and parameters are the same.

[0077] Test: 10 kg of landfill waste was mixed with 2 L of tap water and treated with the processes of Examples 1-4 and Comparative Examples 1-6 respectively. After 2 months, the settlement of landfill waste was measured and statistically analyzed by observation and scale. The test results are shown in Table 2.

[0078] Table 2

[0079] Settlement differences Example 1 +++ Example 2 +++ Example 3 +++ Example 4 +++ Comparative Example 1 + Comparative Example 2 + Comparative Example 3 ++ Comparative Example 4 ++ Comparative Example 5 ++ Comparative Example 6 ++

[0080] The "+" indicates a settlement of 0.5 to 1 cm.

[0081] As can be seen from the test results in Table 2 and Table 1, compared with Comparative Examples 1-6, the process of Examples 1-4 has a significant effect on the settling of landfill waste.

[0082] As shown in Examples 1-4 compared to Comparative Examples 1-2, titanium dioxide generates electrons and holes under light irradiation. Chloride ions in sodium chloride can absorb these electrons, thereby reducing the recombination between electrons and holes. Combined with the active ions generated by sodium ions absorbing light energy, this promotes the oxidative decomposition rate of organic matter. Simultaneously, chloride ions can also adsorb onto the surface of titanium dioxide, increasing its light absorption capacity and further enhancing photocatalytic efficiency. Therefore, the synergistic effect of titanium dioxide and sodium chloride improves the oxidative decomposition efficiency of organic matter in waste. Furthermore, sodium chloride can reduce hydrolysis reactions in waste, thereby slowing down the decomposition process in landfills, extending its storage time, and protecting the environment.

[0083] Compared with Comparative Example 3, Examples 1-4 show that the addition of carboxylates and polycarboxylates can fully combine with various substances, disperse substances, increase the contact surface area of ​​substances, and facilitate chemical reactions.

[0084] Compared with Comparative Example 4, Examples 1-4 show that phosphates, calcium carbonate, and bentonite can effectively regulate the acid-base balance of the reaction. At the same time, phosphates reduce the loss of nutrients such as nitrogen and phosphorus in the waste, ensuring the smooth progress of the reaction; calcium carbonate can neutralize acidic substances in the waste and improve the physical properties of the waste, making it easier to landfill and compact; bentonite can increase the aeration and water retention of the waste, promote the growth of microorganisms, and accelerate the decomposition of the waste.

[0085] As can be seen from Examples 1-4 and Comparative Examples 5-6, the present invention can improve the decomposition rate and degradation efficiency of organic matter in waste within a suitable range of ambient temperature and oxygen concentration.

[0086] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present invention. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.

Claims

1. A process for accelerating the degradation stabilization of a landfill, characterized in that: The process comprises the following steps: 1) preparing an accelerated degradation reagent; wherein the accelerated degradation reagent comprises the following components by weight: 5-10 parts of titanium dioxide, 10-20 parts of sodium chloride, 2-3 parts of phosphate, 1-2 parts of carboxylate, 3-4 parts of calcium carbonate, 3-5 parts of bentonite, 0.5-1 part of enzyme, 3-5 parts of polycarboxylate, and 0.2-0.5 part of organic peroxide; 2) preheating the leachate, adding the accelerated degradation reagent and mixing uniformly to obtain a spraying mixture; 3) spraying the spraying mixture on the surface or inside of the landfill waste, and stirring and mixing uniformly; 4) adjusting the environmental humidity, environmental temperature, oxygen concentration, moisture content, and pH value of the landfill waste; wherein the environmental humidity is 70-80, the environmental temperature is 25-30℃, the oxygen concentration is 16-21%, the moisture content is 40-60%, and the pH value is 6.5-7.5; 5) after a period of time, spraying the landfill waste again to adjust the environmental temperature.

2. A process for accelerating the degradation stabilization of a landfill according to claim 1, characterized in that: In step 2), the preheating temperature is 30-40℃, and the mass ratio of the accelerated degradation reagent to the leachate is 3-8:1500.

3. A process for accelerating the degradation stabilization of a landfill according to claim 1, characterized in that: In step 3), the mass ratio of the spraying mixture to the landfill waste is 1:5-7.

4. A process for accelerating the degradation stabilization of a landfill according to claim 1, characterized in that: In step 5), the adjusted environmental temperature is 65-70℃.

5. A process for accelerating the degradation stabilization of a landfill according to claim 1, characterized in that: The mass ratio of the titanium dioxide to the sodium chloride is 1:1-2; the phosphate is one or more of sodium tripolyphosphate, diammonium hydrogen phosphate, potassium dihydrogen phosphate, and trisodium phosphate.

6. A process for accelerating the degradation stabilization of a landfill as claimed in claim 1, wherein: The carboxylate is one or more of butyl acetate, sodium benzoate, and butyl propionate.

7. A process for accelerating the degradation stabilization of a landfill according to claim 1, characterized in that: The enzyme is one or more of amylase, lipase, and protease.

8. A process for accelerating the degradation stabilization of a landfill according to claim 1, characterized in that: The organic peroxide is di-t-butyl peroxide.

9. A process for accelerating the degradation stabilization of a landfill as claimed in claim 1, wherein: The polycarboxylate is sodium polycarboxylate.

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