Black and odorous water body sludge ecological cap sealing material and preparation method thereof

Abstract

The invention provides a black and odorous water body sludge ecological cap sealing material which comprises a middle-upper layer cap sealing material and a lower layer cap sealing material, and the middle-upper layer cap sealing material comprises modified diatomite, silica fume, modified vermiculite powder, modified attapulgite powder and green zeolite powder. The lower-layer cap seal material comprises quicklime powder, modified attapulgite powder, green zeolite powder, kaolin powder, clay powder and limestone. After the material prepared by a series of modification and compounding is used, a suspension in a black and odorous water body can be promoted to flocculate and precipitate when encountering a dielectric medium, meanwhile, pollutants in sludge are prevented from being released, and a closed state is achieved.

Description

Technical Field

[0001] The invention belongs to the technical field of ecological engineering, and particularly relates to an ecological capping material for black and odorous water sludge and a preparation method thereof. Background Art

[0002] Chinese invention patent application publication number CN111362535A discloses a method and covering material for in-situ remediation of contaminated sediment. The method comprises: sequentially laying a bearing structure barrier layer and a protective layer on the surface of the contaminated sediment. The bearing structure barrier layer is formed by the interaction of a mixture of aggregate and a sealing material with water; the aggregate is a natural mineral; and the sealing material is natural clay, sepiolite, attapulgite, or kaolin. The covering material includes aggregate and a sealing material; the aggregate is a natural mineral; and the sealing material is natural clay, sepiolite, attapulgite, or kaolin.

[0003] The use of sludge capping technology has been proven to be able to repair black and smelly sludge pollution problems in situ, but the current capping materials are less effective and prone to failure. Summary of the Invention

[0004] To address the problems of the prior art, the present invention provides an ecological capping material for black and odorous water sludge, as well as its preparation and use methods. The material, prepared through a series of modifications and composites, can promote flocculation and precipitation of suspended liquids in black and odorous water bodies upon encountering dielectrics, while simultaneously preventing the release of pollutants in the sludge, achieving a sealed state.

[0005] The technical solutions of the present invention are as follows:

[0006] A black and odorous water sludge ecological capping material includes an upper and middle layer capping material and a lower layer capping material, wherein the upper and middle layer capping material includes modified diatomaceous earth, microsilica powder, modified vermiculite powder, modified attapulgite powder, and green zeolite powder, and the lower layer capping material includes quicklime powder, modified attapulgite powder, green zeolite powder, kaolin powder, clay powder, and limestone.

[0007] Preferably, the weight ratio of the modified diatomaceous earth, microsilica powder, modified vermiculite powder, modified attapulgite powder and green zeolite powder in 100g of the upper capping material is 30-40:5-15:20-30:10-20:8-15.

[0008] Preferably, in any of the above solutions, the particle size of each component in the middle and upper capping materials is 1 to 1.5 nm.

[0009] Preferably, in any of the above schemes, the weight ratio of quicklime powder, modified attapulgite powder, green zeolite powder, kaolin powder, clay powder and limestone in 100g of the lower capping material is 30-40:5-10:10-20:5-10:10-15:15-25.

[0010] Preferably, in any of the above solutions, the particle size of each component in the lower capping material is 1 to 1.5 nm.

[0011] The present invention also discloses a method for preparing a black and odorous water body sludge ecological capping material, comprising the following steps:

[0012] (1) A middle and upper layer capping material mainly composed of modified diatomite, microsilica powder, modified vermiculite powder, attapulgite powder and green zeolite powder is prepared, wherein the modified diatomite is soaked in 3-4 mol / L hydrochloric acid at room temperature for 4-6 hours, dried at room temperature for 24 hours and then ground into a nano material with a particle size of 1-1.5 nm for standby use; the modified vermiculite powder is soaked in 3-4 mol / L hydrochloric acid at room temperature for 8-10 hours, dried at room temperature for 18-20 hours and then ground into a nano material with a particle size of 1-1.5 nm for standby use; the modified attapulgite powder is soaked in 3-4 mol / L hydrochloric acid at room temperature for 8-10 hours, dried at room temperature for 18-20 hours and then ground into a nano material with a particle size of 1-1.5 nm for standby use; The rod powder is calcined at a low temperature of 600°C for 8 hours, wherein the temperature is increased by 20-30°C every 10 minutes, and the temperature is lowered by 15-20°C every 10 minutes until it is close to room temperature. The rod powder is then soaked in 3-4 mol / L hydrochloric acid at room temperature for 6-8 hours, dried at room temperature for 10-14 hours, and ground into a nanomaterial with a particle size of 1-1.5 nm. The nanomaterial is soaked in 3-4 mol / L tin chloride solution for 20-26 hours, filtered, and dried in an 80°C oven for 8-10 hours before being taken out for use.

[0013] (4) uniformly stirring the prepared modified diatomaceous earth, microsilica powder, modified vermiculite powder, modified attapulgite powder, and green zeolite powder nanomaterial powder in a blender for 3 to 6 hours at a speed of 1000-1500 rpm;

[0014] (5) preparing a lower capping material mainly composed of quicklime powder, modified attapulgite powder, green zeolite powder, kaolin powder, clay powder, and limestone, wherein all materials used need to be ground into nanomaterials of 1 to 1.5 nm, wherein the modified attapulgite powder preparation method in the upper capping material is the modified attapulgite powder preparation method;

[0015] (6) The prepared modified diatomaceous earth, microsilica powder, modified vermiculite powder, modified attapulgite powder, and green zeolite powder nanomaterial powder are uniformly stirred in a blender for 2 to 3 hours at a speed of 800-1000 rpm.

[0016] (7) After the preparation of the upper and lower capping materials is completed, they are sealed and vacuum-sealed for later use.

[0017] The present invention also discloses a method for using an ecological capping material for black and odorous water sludge, which is specifically as follows: when using it in a certain black and odorous water body, the water body is first drained, and then a lower-layer capping material mainly composed of quicklime powder, modified attapulgite powder, green zeolite powder, kaolin powder, clay powder, and limestone is diluted with 800-1200 ml of water at a dosage of 15-25 g per square meter and evenly sprayed on the sludge surface. After the pond is exposed to the sun for 5-8 hours, a middle and upper-layer capping material mainly composed of modified diatomaceous earth, microsilica powder, modified vermiculite powder, modified attapulgite powder, and green zeolite powder is diluted with 1000-1500 ml of water at a dosage of 25-35 g per square meter and evenly sprayed on the sludge surface. After the pond is exposed to the sun for 12-16 hours, the water is released to complete the use.

[0018] Many natural inorganic minerals rich in iron and chloride ions, such as vermiculite, palygorskite, diatomaceous earth, and silicate minerals, can be modified to immobilize pollutants. These minerals possess large surface areas and adsorption capacities, excellent rheological and catalytic properties, and ideal colloidal and heat-resistant properties. The materials prepared through a series of modifications and composites in this invention can promote flocculation and precipitation of suspended liquids in black and odorous water bodies upon contact with dielectrics, while simultaneously preventing the release of pollutants from sludge and achieving a sealed state. DETAILED DESCRIPTION

[0019] Unless otherwise specified, the methods used in the following examples are all conventional methods.

[0020] Unless otherwise specified, the materials and reagents used in the following examples can be obtained from commercial sources.

[0021] To facilitate understanding of the present invention, the present invention will be described more fully below. The present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the understanding of the present disclosure more thorough and comprehensive.

[0022] Example 1

[0023] A mid- and upper-layer capping material formulation mainly comprises modified diatomaceous earth, microsilica fume, modified vermiculite powder, modified attapulgite powder, and green zeolite powder, wherein the weight ratio per 100g is 30:15:20:20:15. The particle size of each material is 1 to 1.5nm.

[0024] A lower capping material formula mainly includes quicklime powder, modified attapulgite powder, green zeolite powder, kaolin powder, clay powder, and limestone, wherein the weight ratio of 100g is 30:10:15:5:15:25. The particle size of each material is 1 to 1.5nm.

[0025] The preparation method of the ecological capping material for black and odorous water sludge comprises the following steps:

[0026] (1) A middle and upper layer capping material mainly composed of modified diatomite, microsilica powder, modified vermiculite powder, attapulgite powder and green zeolite powder is prepared, wherein the modified diatomite is soaked in 3-4 mol / L hydrochloric acid at room temperature for 4-6 hours, dried at room temperature for 24 hours and then ground into a nano material with a particle size of 1-1.5 nm for standby use; the modified vermiculite powder is soaked in 3-4 mol / L hydrochloric acid at room temperature for 8-10 hours, dried at room temperature for 18-20 hours and then ground into a nano material with a particle size of 1-1.5 nm for standby use; the modified attapulgite powder is soaked in 3-4 mol / L hydrochloric acid at room temperature for 8-10 hours, dried at room temperature for 18-20 hours and then ground into a nano material with a particle size of 1-1.5 nm for standby use; The rod powder is calcined at a low temperature of 600°C for 8 hours, wherein the temperature is increased by 20-30°C every 10 minutes, and the temperature is lowered by 15-20°C every 10 minutes until it is close to room temperature. The rod powder is then soaked in 3-4 mol / L hydrochloric acid at room temperature for 6-8 hours, dried at room temperature for 10-14 hours, and ground into a nanomaterial with a particle size of 1-1.5 nm. The nanomaterial is soaked in 3-4 mol / L tin chloride solution for 20-26 hours, filtered, and dried in an 80°C oven for 8-10 hours before being taken out for use.

[0027] (4) uniformly stirring the prepared modified diatomite, microsilica, modified vermiculite powder, modified attapulgite powder, and green zeolite powder nanomaterial powder in a blender for 3 to 6 hours at a speed of 1000-1500 rpm;

[0028] (5) preparing a lower capping material mainly composed of quicklime powder, modified attapulgite powder, green zeolite powder, kaolin powder, clay powder, and limestone, wherein all materials used need to be ground into nanomaterials of 1 to 1.5 nm, wherein the modified attapulgite powder preparation method in the upper capping material is the modified attapulgite powder preparation method;

[0029] (6) The prepared modified diatomaceous earth, microsilica powder, modified vermiculite powder, modified attapulgite powder, and green zeolite powder nanomaterial powder are uniformly stirred in a blender for 2 to 3 hours at a speed of 800 to 1000 rpm.

[0030] (7) After the preparation of the upper and lower capping materials is completed, they are sealed and vacuum-sealed for later use.

[0031] When used in a certain black and smelly water body, the water body is first drained, and then a lower layer capping material mainly composed of quicklime powder, modified attapulgite powder, green zeolite powder, kaolin powder, clay powder, and limestone is diluted with 800 ml of water at a dosage of 15 g per square meter and evenly sprayed on the sludge surface. After the pond is dried for 8 hours, a middle and upper layer capping material mainly composed of modified diatomaceous earth, microsilica powder, modified vermiculite powder, modified attapulgite powder, and green zeolite powder is diluted with 1000 ml of water at a dosage of 25 g per square meter and evenly sprayed on the sludge surface. After the pond is dried for 16 hours, the water is released and the use is completed.

[0032] After 10 days of water discharge, the TP in the environment decreased by 70% compared to the initial reduction, and the COD decreased by 85%.

[0033] Example 2

[0034] A middle and upper layer cap sealing material formula mainly composed of modified diatomite, microsilica powder, modified vermiculite powder, modified attapulgite powder, and green zeolite powder, wherein the weight ratio of 100g is 40:10:30:10:10. The particle size of each material is 1-1.5nm.

[0035] A lower layer cap sealing material formula mainly composed of quicklime powder, modified attapulgite powder, green zeolite powder, kaolin powder, clay powder, and limestone, wherein the weight ratio of 100g is 30:8:12:10:15:25. The particle size of each material is 1-1.5nm.

[0036] When used in a certain black and smelly water body, first drain the water, then dilute a lower layer cap sealing material mainly composed of quicklime powder, modified attapulgite powder, green zeolite powder, kaolin powder, clay powder, and limestone to 20g per square meter with 1000ml of water, and then spray it evenly on the surface of the sludge, then sun for 5 hours, then dilute a middle and upper layer cap sealing material mainly composed of modified diatomite, microsilica powder, modified vermiculite powder, modified attapulgite powder, and green zeolite powder to 30g per square meter with 1200ml of water, and then spray it evenly on the surface of the sludge, then sun for 12 hours, and then complete the use after water discharge.

[0037] After 10 days of water discharge, the TP in the environment decreased by 72% compared to the initial reduction, and the COD decreased by 84%.

[0038] Example 3

[0039] A middle and upper layer cap sealing material formula mainly composed of modified diatomite, microsilica powder, modified vermiculite powder, modified attapulgite powder, and green zeolite powder, wherein the weight ratio of 100g is 35:10:25:20:10. The particle size of each material is 1-1.5nm.

[0040] A lower layer cap sealing material formula mainly composed of quicklime powder, modified attapulgite powder, green zeolite powder, kaolin powder, clay powder, and limestone, wherein the weight ratio of 100g is 32:8:20:10:15:15. The particle size of each material is 1-1.5nm.

[0041] When used in a certain black and smelly water body, the water body is first drained, and then a lower layer capping material mainly composed of quicklime powder, modified attapulgite powder, green zeolite powder, kaolin powder, clay powder, and limestone is diluted with 1200 ml of water at a dosage of 25 g per square meter and evenly sprayed on the sludge surface. After the pond is exposed to the sun for 24 hours, a middle and upper layer capping material mainly composed of modified diatomaceous earth, microsilica powder, modified vermiculite powder, modified attapulgite powder, and green zeolite powder is diluted with 1500 ml of water at a dosage of 35 g per square meter and evenly sprayed on the sludge surface. After the pond is exposed to the sun for 16 hours, the water is released and the use is completed.

[0042] After 10 days of releasing water to a depth of 1.0 m, the TP in the environment decreased by 73% and the COD decreased by 84% compared to the initial level.

[0043] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. An ecological capping material for black and odorous water sludge, characterized in that: It includes an upper-middle layer capping material and a lower-layer capping material. The upper-middle layer capping material includes modified diatomaceous earth, microsilica powder, modified vermiculite powder, modified attapulgite powder, and green zeolite powder. The lower-layer capping material includes quicklime powder, modified attapulgite powder, green zeolite powder, kaolin powder, clay powder, and limestone.

2. The black and odorous water sludge ecological capping material according to claim 1, characterized in that: The weight ratio of the modified diatomaceous earth, microsilica powder, modified vermiculite powder, modified attapulgite powder and green zeolite powder in 100g of the upper capping material is 30-40:5-15:20-30:10-20:8-15.

3. The black and odorous water sludge ecological capping material according to claim 2, characterized in that: The particle size of each component in the middle and upper layer capping material is 1 to 1.5 nm.

4. The black and odorous water sludge ecological capping material according to claim 1, characterized in that: The weight ratio of quicklime powder, modified attapulgite powder, green zeolite powder, kaolin powder, clay powder and limestone in 100g of the lower capping material is 30-40:5-10:10-20:5-10:10-15:15-25.

5. The black and odorous water sludge ecological capping material according to claim 4, characterized in that: The particle size of each component in the lower capping material is 1 to 1.5 nm.

6. A method for preparing an ecological capping material for black and odorous water sludge, comprising the following steps: (1) preparing a middle and upper layer capping material mainly composed of modified diatomite, microsilica powder, modified vermiculite powder, attapulgite powder and green zeolite powder, wherein: The modified diatomaceous earth is soaked in 3-4 mol / L hydrochloric acid at room temperature for 4-6 hours, dried at room temperature for 24 hours, and ground into a nano material with a particle size of 1-1.5 nm for later use; the modified vermiculite powder is soaked in 3-4 mol / L hydrochloric acid at room temperature for 8-10 hours, dried at room temperature for 18-20 hours, and ground into a nano material with a particle size of 1-1.5 nm for later use; the modified attapulgite powder is calcined at 600° C. for 8 hours, wherein the temperature is increased by 20-30° C. every 10 minutes during the heating process, and the temperature is decreased by 15-20° C. every 10 minutes during the calcination process for 8 hours until the temperature approaches room temperature; the modified attapulgite powder is then soaked in 3-4 mol / L hydrochloric acid at room temperature for 6-8 hours, dried at room temperature for 10-14 hours, and ground into a nano material with a particle size of 1-1.5 nm for later use; the modified vermiculite powder is soaked in 3-4 mol / L tin chloride solution for 20-26 hours, filtered, dried in an 80° C. oven for 8-10 hours, and then taken out for later use; (4) uniformly stirring the prepared modified diatomaceous earth, microsilica powder, modified vermiculite powder, modified attapulgite powder, and green zeolite powder nanomaterial powder in a blender for 3 to 6 hours at a speed of 1000-1500 rpm; (5) preparing a lower capping material mainly composed of quicklime powder, modified attapulgite powder, green zeolite powder, kaolin powder, clay powder, and limestone, wherein all materials used need to be ground into nanomaterials of 1 to 1.5 nm, wherein the preparation method of the modified attapulgite powder is the same as that of the modified attapulgite powder in the middle and upper capping materials; (6) The prepared modified diatomaceous earth, microsilica powder, modified vermiculite powder, modified attapulgite powder, and green zeolite powder nanomaterial powder are uniformly stirred in a blender for 2 to 3 hours at a speed of 800-1000 rpm. (7) After the preparation of the upper and lower capping materials is completed, they are sealed and vacuum-sealed for later use.

7. A method for using an ecological capping material for sludge in black and odorous water bodies, specifically: when using it in a certain black and odorous water body, first drain the water body, then dilute the lower layer capping material mainly composed of quicklime powder, modified attapulgite powder, green zeolite powder, kaolin powder, clay powder, and limestone with water and spray it on the sludge surface, then dry the pond, then dilute the middle and upper layer capping material mainly composed of modified diatomaceous earth, microsilica powder, modified vermiculite powder, modified attapulgite powder, and green zeolite powder with water and evenly spray it on the sludge surface, then dry the pond and drain the water to complete the use.

8. The method for using the black and odorous water sludge ecological capping material according to claim 7, characterized in that: The lower capping material is diluted with 800-1200 ml of water at a dosage of 15-25 g per square meter and sprayed evenly on the sludge surface, and then the pond is exposed to the sun for 5-8 hours.

9. The method for using the black and odorous water sludge ecological capping material according to claim 7, characterized in that: The middle and upper layer capping material is diluted with 1000-1500 ml of water at a dosage of 25-35 g per square meter and sprayed evenly on the sludge surface, and then the pond is exposed to the sun for 12-16 hours.