A method for realizing solid waste regeneration by multi-stage mixing

Abstract

The present invention discloses a method for realizing solid waste regeneration by multi-stage mixing. The specific technical contents of the present invention are as follows: firstly, hazardous waste identification and soil pollution risk assessment are performed on solid wastes from different sources; then, key index assessment is performed, such as organic matter, nitrogen content, phosphorus content, potassium content, etc.; solid waste to be mixed is selected, and its weight is recorded as MS1, MS2...MS n By solving the equations, we can get MS1, MS2...MS n The pH value should be converted into the hydrogen ion concentration within the value range. The advantage of the present invention is that it can synergistically absorb multiple solid wastes for the preparation of regenerated soil, and synergistically condition the soil according to the properties of solid wastes from different sources and the requirements of application scenarios. In addition, the present invention classifies the key parameters of the soil, and reasonably conditions it before or after mixing multi-source solid wastes to avoid adding too much auxiliary materials, and the process is simple, and it can also be promoted for quantitative use by enterprises.

Description

Technical Field

[0001] The present invention relates to the technical field of ecological environment engineering, and in particular to a method for realizing solid waste regeneration through multi-stage preparation. Background Art

[0002] A large amount of solid waste is generated in urban and rural construction and residents' lives. This includes muddy solid wastes such as municipal sewage sludge, river silt, engineering mud, and waste incineration slag washing mud, sandy solid wastes such as aggregates from construction waste and waste incineration slag, and soil solid wastes such as waste soil generated during urban site renewal. The resource disposal of solid waste is very important to ensure the healthy operation of the city.

[0003] A large amount of soil is needed for landscaping and other purposes in urban construction. Existing public technologies mainly prepare solid waste into soil conditioners, such as "A solid waste-based soil conditioner and its construction method", "A method for preparing a soil conditioner for passivating soil heavy metals using phosphogypsum as a raw material", "A method and product for producing soil conditioners using bulk industrial solid waste", etc. Some sandy solid wastes and soil solid wastes have pores themselves, so they have water retention and air permeability, and a few soil solid wastes also have organic matter that provides nutrients. Conditioning solid wastes and preparing recycled soil for urban construction is a very promising method for disposing of solid wastes. Summary of the invention

[0004] The purpose of the present invention is to provide a method for realizing solid waste regeneration by multi-stage preparation to solve the problem that solid waste cannot be disposed of in large quantities in the prior art.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] A method for realizing solid waste regeneration by multi-stage mixing, the specific technical contents of the invention are as follows:

[0007] The first step is to identify solid wastes from different sources as hazardous wastes and conduct soil pollution risk assessments, and then conduct key indicator assessments. If solid wastes are hazardous wastes or have soil pollution risks, they cannot be used to prepare recycled soil.

[0008] In the second step, the solid waste screened in the first step is marked as S1, S2, etc. according to its source. n ;

[0009] The third step is to determine the key indicator parameters according to the application scenario requirements of the conditioned soil, which are divided into three categories, including 1. The first type of key indicators that do not change significantly due to mixing, mainly physical indicators, such as the porosity and bulk density of the sample; 2. The second type of key indicators that may change significantly due to mixing, mainly chemical indicators, such as pH; 3. The third type of key parameters, which are usually extremely low in solid waste itself, are mainly soil nutrients, such as organic matter, nitrogen content, phosphorus content, potassium content, etc.;

[0010] Step 4: Record the contents of all the first-category key indicators and the second-category key indicators of the solid waste from a certain source in the first step as S1x, S1y, S1z, etc., respectively; record the upper limit requirements of the first-category key indicators and the second-category key indicators for the application scenarios of the conditioned soil as Xmax, Ymax, Zmax, etc.; record the lower limit requirements of the first-category key indicators and the second-category key indicators for the application scenarios of the conditioned soil as Xmin, Ymin, Zmin, etc.;

[0011] Step 5: Select the solid waste to be blended, such as S1, S2...S nn , and record their weights as MS1, MS2...MS n , according to its key indicator parameters, the equations are listed as follows. By solving the equations, we can get MS1, MS2...MS n The range of values, where pH value is used as a key indicator parameter, should be converted into hydrogen ion concentration;

[0012]

[0013]

[0014] Preferably, the MS1, MS2, ..., MS calculated in the fifth step are n Within the value range, take solid waste samples of corresponding weight and mix them thoroughly.

[0015] Preferably, some samples of the obtained mixed solid waste are taken to test the second and third key indicators described in the fourth step, and the soil is conditioned with reference to the application scenario requirements of the conditioned soil to improve the second and third key indicators.

[0016] Preferably, soil conditioning mainly includes pH adjustment, nutrient content adjustment, etc. If the pH is too high, an acidic conditioner is added; if the pH is too low, an alkaline conditioner is added. The acidic conditioner is an organic weak acid such as citric acid, malic acid, and oxalic acid; the alkaline conditioner is a weak base such as sodium carbonate, sodium bicarbonate, potassium carbonate, and potassium bicarbonate.

[0017] Preferably, if the nutrient content is insufficient, compound fertilizer, organic fertilizer or fertilizer containing specific elements can be added.

[0018] The invention provides a method for realizing solid waste regeneration through multi-stage mixing. The invention has the advantage of being able to synergistically absorb multiple solid wastes for the preparation of regenerated soil. The invention coordinates the conditioning according to the properties of solid wastes from different sources and the requirements of the application scenarios; and the invention classifies the key parameters of the soil, and reasonably conditions before or after mixing the multi-source solid wastes to avoid adding too many auxiliary materials. The process is simple and easy to promote, which is more suitable for current farmers. It can also be promoted for quantitative use by enterprises, which is more practical, novel and innovative. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the process of the present invention. DETAILED DESCRIPTION

[0020] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with specific embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0021] A method for realizing solid waste regeneration by multi-stage mixing, the specific technical contents of the invention are as follows:

[0022] The first step is to identify solid wastes from different sources as hazardous wastes and conduct soil pollution risk assessments, and then conduct key indicator assessments. If solid wastes are hazardous wastes or have soil pollution risks, they cannot be used to prepare recycled soil.

[0023] In the second step, the solid waste screened in the first step is marked as S1, S2, etc. according to its source. n ;

[0024] The third step is to determine the key indicator parameters according to the application scenario requirements of the conditioned soil, which are divided into three categories, including 1. The first type of key indicators that do not change significantly due to mixing, mainly physical indicators, such as the porosity and bulk density of the sample; 2. The second type of key indicators that may change significantly due to mixing, mainly chemical indicators, such as pH; 3. The third type of key parameters, which are usually extremely low in solid waste itself, are mainly soil nutrients, such as organic matter, nitrogen content, phosphorus content, potassium content, etc.;

[0025] Step 4: Record the contents of all the first-category key indicators and the second-category key indicators of the solid waste from a certain source in the first step as S1x, S1y, S1z, etc., respectively; record the upper limit requirements of the first-category key indicators and the second-category key indicators for the application scenarios of the conditioned soil as Xmax, Ymax, Zmax, etc.; record the lower limit requirements of the first-category key indicators and the second-category key indicators for the application scenarios of the conditioned soil as Xmin, Ymin, Zmin, etc.;

[0026] Step 5: Select the solid waste to be blended, such as S1, S2...S n , and record their weights as MS1, MS2...MS n , according to its key indicator parameters, the equations are listed as follows. By solving the equations, we can get MS1, MS2...MS n The range of values, where pH value is used as a key indicator parameter, should be converted into hydrogen ion concentration;

[0027]

[0028] The MS1, MS2, and MS n , take a solid waste sample of corresponding weight and mix them thoroughly. Take some samples of the obtained mixed solid waste, test the second and third key indicators described in the fourth step, and condition the soil with reference to the application scenario requirements of the conditioned soil to improve the second and third key indicators. Soil conditioning mainly includes pH adjustment, nutrient content adjustment, etc. If the pH is too high, add an acidic conditioner; if the pH is too low, add an alkaline conditioner. The acidic conditioner is an organic weak acid such as citric acid, malic acid, and oxalic acid; the alkaline conditioner is a weak base such as sodium carbonate, sodium bicarbonate, potassium carbonate, and potassium bicarbonate to ensure the nutrients. If the nutrient content is insufficient, compound fertilizer, organic fertilizer or fertilizer containing specific elements can be added.

[0029] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A method for realizing solid waste regeneration by multi-stage preparation, characterized in that: The specific technical contents of the present invention are as follows: The first step is to identify solid wastes from different sources as hazardous wastes and conduct soil pollution risk assessments, and then conduct key indicator assessments. If solid wastes are hazardous wastes or have soil pollution risks, they cannot be used to prepare recycled soil. In the second step, the solid waste screened in the first step is marked as S1, S2, etc. according to its source. n ; Step 3: According to the application scenario requirements of the conditioned soil, key indicator parameters are determined and divided into three categories, including (1) the first type of key indicators (mainly physical indicators) that do not change significantly due to mixing, such as the porosity and bulk density of the sample; (2) the second type of key indicators (mainly chemical indicators) that may change significantly due to mixing, such as pH; (3) the third type of key parameters (mainly soil nutrients) that are usually very low in solid waste itself, such as organic matter, nitrogen content, phosphorus content, potassium content, etc. Step 4: Record the contents of all the first-category key indicators and the second-category key indicators of the solid waste S1 from a certain source in the first step as S1x, S1y, S1z, etc., respectively; record the upper limit requirements of the first-category key indicators and the second-category key indicators for the application scenarios of the conditioned soil as Xmax, Ymax, Zmax, etc., respectively; record the lower limit requirements of the first-category key indicators and the second-category key indicators for the application scenarios of the conditioned soil as Xmin, Ymin, Zmin, etc., respectively; Step 5: Select the solid waste to be blended, such as S1, S2...S n , and record their weights as MS1, MS2...MS n , according to its key indicator parameters, the equations are listed as follows. By solving the equations, we can get MS1, MS2...MS n The range of values, where pH value is used as a key indicator parameter, should be converted into hydrogen ion concentration; 2. The method for realizing solid waste regeneration by multi-stage preparation according to claim 1, characterized in that: The MS1, MS2, and MS n Within the value range, take solid waste samples of corresponding weight and mix them thoroughly.

3. The method for realizing solid waste regeneration by multi-stage preparation according to claim 2, characterized in that: Take some samples of the obtained mixed solid waste, test the second key indicators and the third key indicators described in the fourth step, and condition the soil with reference to the application scenario requirements of the conditioned soil to improve the second key indicators and the third key indicators.

4. The method for realizing solid waste regeneration by multi-stage preparation according to claim 3, characterized in that: Soil conditioning mainly includes pH adjustment, nutrient content adjustment, etc. If the pH is too high, add an acidic conditioner; if the pH is too low, add an alkaline conditioner. Acidic conditioners are organic weak acids such as citric acid, malic acid, and oxalic acid; alkaline conditioners are weak bases such as sodium carbonate, sodium bicarbonate, potassium carbonate, and potassium bicarbonate.

5. The method for realizing solid waste regeneration by multi-stage preparation according to claim 4, characterized in that: If the nutrient content is insufficient, you can add compound fertilizer, organic fertilizer or fertilizer containing specific elements.

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