Urban drainage pipe network organic matter pollution sludge conditioner and preparation method thereof

Abstract

The invention discloses an urban drainage pipe network organic matter pollution sludge conditioner and a blending method thereof. The conditioner comprises a blending agent river sand for improving the particle size distribution of sludge, calcium superphosphate for blending the pH value of the sludge and increasing the total nutrient content in the sludge, urea and a compound microbial agent, the river sand, the calcium superphosphate, the urea and the compound microbial agent are added into the organic matter polluted sludge of the urban drainage pipe network to obtain mixed soil; the mass percentage content of the river sand added into the sludge is 15-20%; the mass percentage content of calcium superphosphate added into the sludge is 0.5-3%; the mass percent of the urea added into the sludge is 0.4-2%. The problems that dewatered sludge is generally small in particle size, high in pH and insufficient in nutrient content are solved through scientific blending, the sludge reaches the use standard of landscaping soil, and stabilization and efficient resource utilization of the sludge are achieved.

Description

Technical Field

[0001] The invention relates to a city drainage network organic matter polluted sludge conditioner and a preparation method thereof, belonging to the technical field of city drainage network sludge treatment. Background Art

[0002] With the rapid development of my country's economy and the acceleration of urban modernization, the mileage of urban drainage pipe networks has been extended. In recent years, with the continuous strengthening and standardization of drainage pipe network maintenance work, the treatment and disposal of a large amount of sludge removed has become an important task in the operation of municipal engineering. How to properly handle and dispose of this sludge and avoid the secondary pollution it brings is an urgent problem to be solved in the current pipe network maintenance work.

[0003] At present, there are four main ways to dispose sludge in my country: sanitary landfill, incineration, land use and building material use. Although there are many ways to dispose sludge, most of them have problems such as high cost and high risk of environmental pollution. Among the many ways to dispose sludge, sludge gardening is a relatively easy and easy way to dispose sludge in land use. The landscaping use of sludge can avoid the food chain and will not harm human health. At the same time, it can effectively utilize the organic nitrogen, phosphorus and various effective trace elements in the sludge.

[0004] However, the current dredging sludge after dehydration treatment generally has problems such as high pH, ​​low nutrient salt content, and small particle size, and cannot meet the requirements of relevant standards for landscaping soil. Summary of the invention

[0005] Purpose of the invention: In view of the problems and shortcomings existing in the prior art, the present invention provides an urban drainage network organic pollution sludge conditioner and a preparation method thereof, which solves the common problems of small particle size, high pH and insufficient nutrient content in dewatered sludge through scientific preparation, so that the sludge meets the use standards of landscaping soil, and realizes the stabilization and efficient resource utilization of the sludge.

[0006] Technical solution: A conditioner for organically polluted sludge in urban drainage pipe networks, comprising a conditioning agent - river sand for improving sludge particle size distribution, superphosphate for adjusting the pH value of the sludge and increasing the total nutrient content in the sludge, urea, and a composite microbial agent; the river sand, superphosphate, urea and composite microbial agent are added to the organically polluted sludge in the urban drainage pipe network to obtain a conditioned soil; in the conditioned soil, the mass percentage content of the river sand is 15-20%; the mass percentage content of the superphosphate is 0.5-3%; and the mass percentage content of the urea is 0.4-2%.

[0007] The composite microbial agent includes Bacillus subtilis 10 6 -10 8CFU / g, Bacillus licheniformis 10 6 -10 8 CFU / g and Paenibacillus 10 5 -10 7 CFU / g.

[0008] A method for preparing a sludge conditioner for organic pollution in a city drainage network, wherein the prepared soil is obtained through steps S1-S4, and the implementation process of the steps is as follows:

[0009] S1: Add river sand as a blending agent to the organic polluted sludge in the municipal drainage network to improve the particle size distribution of the sludge. The mass percentage of river sand added is 15-20%, so that the average particle size (D 50 ) reaches 70-80μm, improving the air permeability and structural stability of the sludge-modified garden soil. The mass percentage of the river sand is the percentage of the total mass of the soil after mixing;

[0010] The average particle size calculation formula described in S1 is:

[0011]

[0012] Where D 50 is the average particle size after preparation, M soil and M sand are the mass of residual soil and river sand, D50 soil is the average particle size of sludge, D50 sand is the average particle size of river sand.

[0013] S2: Add superphosphate (Ca(H 2 PO 4 ) 2 ·H 2 O) Controlling the pH value of the prepared sludge and increasing the total nutrient content in the sludge. In the prepared soil, the mass percentage of superphosphate added is 0.5-3%, and the pH value of the sludge is adjusted to the range of 5.0-8.3, which is suitable for the growth requirements of garden plants and provides effective phosphorus.

[0014] S3: Add 0.4-2% urea (CO(NH 2 ) 2 ), the mass percentage of the urea is the percentage of the total mass of the soil after preparation. The combination of superphosphate and urea not only ensures a balanced nitrogen-phosphorus ratio in the mixture, but also improves the fertility level of the sludge to meet the growth needs of garden plants.

[0015] S4: Add composite microbial agents, and the mass percentage of the added agents in the prepared soil is controlled at 0.5-1%.

[0016] The composite microbial agent of the present invention comprises Bacillus subtilis (10 6 -10 8 CFU / g), Bacillus licheniformis (10 6 -10 8 CFU / g) and Paenibacillus (10 5 -10 7 CFU / g).

[0017] Beneficial effects: Compared with the prior art, the present invention has the following advantages:

[0018] (1) The present invention provides a conditioning agent for organic contaminated sludge in urban drainage networks and a preparation method thereof to realize a simple and easy resource utilization method for organic contaminated sludge in urban drainage networks, which has the advantages of simple operation, low cost and wide applicability, and is particularly suitable for the treatment of dredging sludge in large-scale municipal engineering. Compared with traditional treatment methods such as landfill and incineration, the present invention has significant advantages in terms of economy, environmental protection and resource utilization, and provides an innovative technical path for the efficient resource utilization of urban sludge.

[0019] (2) The materials used in the present invention are economical and readily available, such as river sand, superphosphate, urea and composite microbial agents. These materials are not only widely available and inexpensive, but also highly efficient and sustainable, and suitable for large-scale application in municipal engineering. Compared with traditional sludge treatment methods, the present invention avoids the expensive construction of incineration facilities and high operating costs, and reduces the demand for landfill sites.

[0020] (3) The preparation process of the present invention is simple and easy to operate, the required steps are easy to master, and it can be connected with the existing sludge treatment process. Whether it is sludge source treatment or centralized treatment center, the method of the present invention can be quickly implemented, significantly shortening the treatment cycle and improving the sludge treatment efficiency. This feature makes it more operational in municipal engineering management and reduces the dependence on complex equipment and highly skilled personnel. DETAILED DESCRIPTION

[0021] The present invention is further explained below in conjunction with specific embodiments. It should be understood that these embodiments are only used to illustrate the present invention and are not used to limit the scope of the present invention. After reading the present invention, various equivalent forms of modifications to the present invention by those skilled in the art all fall within the scope defined by the claims attached to this application.

[0022] Example 1

[0023] An organic polluted sludge conditioner for urban drainage network comprises river sand, superphosphate, urea and composite microbial agent; river sand, superphosphate, urea and composite microbial agent are added to the sludge treated by a dehydration process, the sludge has a water content of 34.8%, a pH of 8.93, and a total mass of 852.84 g, 147.16 g of river sand, 16.27 g of superphosphate, 4.3 g of urea and 1 g of composite microbial agent are uniformly mixed in the sludge.

[0024] Method for preparing the organic polluted sludge conditioner for urban drainage pipe network: 852.84g of sludge (water content 34.8%, pH 8.93) after dehydration process is taken, 147.16g of river sand, 16.27g of superphosphate, 4.3g of urea and 1g of composite microbial agent are added respectively, and the mixture is fully mixed. At this time, N / P in the prepared sludge is 0.5.

[0025] The composite microbial agent includes Bacillus subtilis (10 6 -10 8 CFU / g), Bacillus licheniformis (10 6 -10 8 CFU / g) and Paenibacillus (10 5 -10 7 CFU / g).

[0026] Example 2

[0027] An organic polluted sludge conditioner for urban drainage network comprises river sand, superphosphate, urea and composite microbial agent; river sand, superphosphate, urea and composite microbial agent are added to the sludge treated by a dehydration process, the sludge has a water content of 34.8%, a pH of 8.93, and a total mass of 852.84 g, 147.16 g of river sand, 12.2 g of superphosphate, 6.4 g of urea and 1 g of composite microbial agent are uniformly mixed in the sludge.

[0028] Method for preparing the organic polluted sludge conditioner for urban drainage pipe network: 852.84g of sludge (water content 34.8%, pH 8.93) after dehydration process is taken, 147.16g of river sand, 12.2g of superphosphate, 6.4g of urea and 1g of composite microbial agent are added respectively, and mixed thoroughly. At this time, N / P in the prepared sludge is 1.

[0029] The composite microbial agent includes Bacillus subtilis (10 6 -10 8 CFU / g), Bacillus licheniformis (10 6 -10 8 CFU / g) and Paenibacillus (10 5 -10 7CFU / g).

[0030] Example 3

[0031] An organic polluted sludge conditioner for urban drainage network comprises river sand, superphosphate, urea and composite microbial agent; river sand, superphosphate, urea and composite microbial agent are added to the sludge after being treated by a dehydration process, the sludge has a moisture content of 34.8%, a pH value of 8.93, and a total mass of 852.84 g, 147.16 g of river sand, 8.1 g of superphosphate, 2.9 g of urea and 1 g of composite microbial agent are uniformly mixed in the sludge.

[0032] Method for preparing the organic polluted sludge conditioner for urban drainage pipe network: 852.84g of sludge (water content 34.8%, pH 8.93) after dehydration process is taken, 147.16g of river sand, 8.1g of superphosphate, 2.6g of urea and 1g of composite microbial agent are added respectively, and the mixture is fully mixed. At this time, N / P in the prepared sludge is 2.

[0033] Comparative Example 1

[0034] A sludge conditioner for organic pollution in urban drainage pipe networks, which is different from Example 1 in that the preparation scheme does not include a composite microbial agent.

[0035] Comparative Example 2

[0036] A sludge conditioner for organic pollution in urban drainage pipe networks, which is different from Example 2 in that the preparation scheme does not include a composite microbial agent.

[0037] Comparative Example 3

[0038] A sludge conditioner for organic pollution in urban drainage networks, which is different from Example 3 in that the preparation scheme does not include a composite microbial agent.

[0039] Technical effect:

[0040] The particle size, pH, and total nutrients of the prepared sludge were measured and seed germination experiments were carried out under the same conditions. The particle size of the prepared sludge was 73.28μm, the total nutrient content reached 3%, and the pH and seed germination test results were as follows:

[0041] pH Germination Index Example 1 6.91 78.84 Example 2 6.78 87.83 Example 3 6.74 73.86 Comparative Example 1 6.32 56.50 Comparative Example 2 6.33 50.68 Comparative Example 3 6.98 66.00

[0042] From the above results, it can be seen that the sludge conditioner provided by the present invention can balance the nutrient elements for the sludge, increase the effective nitrogen and phosphorus content, reduce the pH value of the sludge, and at the same time increase the sludge particle size to improve the physical properties of the sludge and improve its mechanical stability. It can be seen from the comparative examples that the composite microbial agent can effectively promote the development of plant roots and stabilize fertility, thereby improving the germination index in the seed germination experiment, so that the prepared sludge meets the standard requirement of a germination index greater than 70%.

Claims

1. A sludge conditioner for organic pollution in urban drainage pipe networks, characterized in that: The invention comprises river sand, superphosphate, urea and composite microbial agent; the river sand, superphosphate, urea and composite microbial agent are added to sludge to obtain prepared soil; in the prepared soil, the mass percentage content of the river sand is 15-20%; the mass percentage content of the superphosphate is 0.5-3%; and the mass percentage content of the urea is 0.4-2%.

2. The organic polluted sludge conditioner for urban drainage pipe network according to claim 1, characterized in that: The composite microbial agent includes Bacillus subtilis 10 6 -10 8 CFU / g, Bacillus licheniformis 10 6 -10 8 CFU / g and Paenibacillus 10 5 -10 7 CFU / g.

3. The organic polluted sludge conditioner for urban drainage pipe network according to claim 1, characterized in that: The sludge is organic-contaminated sludge from the urban drainage network.

4. A method for preparing a sludge conditioner for organic pollution in urban drainage pipe networks, characterized in that: After steps S1-S4, the prepared soil is obtained, and the implementation process of the steps is as follows: S1: adding river sand as a blending agent to the sludge, the mass percentage of the river sand added is 15-20%, and the mass percentage of the river sand is the percentage of the total mass of the soil after blending; S2: Add superphosphate control. In the prepared soil, the mass percentage of superphosphate added is 0.5-3%; S3: adding 0.4-2% by mass of urea to the sludge prepared in S2, wherein the mass percentage of urea is the percentage of the total mass of the prepared soil; S4: Add composite microbial agents; in the prepared soil, the added mass percentage is controlled at 0.5-1%.

5. The method for preparing the organic polluted sludge conditioner for urban drainage pipe network according to claim 4, characterized in that: The sludge is organic-contaminated sludge from the urban drainage network.

6. The method for preparing the organic polluted sludge conditioner for urban drainage pipe network according to claim 4, characterized in that: The composite microbial agent includes Bacillus subtilis 10 6 -10 8 CFU / g, Bacillus licheniformis 10 6 -10 8 CFU / g and Paenibacillus 10 5 -10 7 CFU / g.

7. The method for preparing the organic polluted sludge conditioner for urban drainage pipe network according to claim 4, characterized in that: In the step S1, the average particle size D after mixing is 50 Reach 70-80μm, the average particle size calculation formula is: Where D 50 is the average particle size after preparation, M soil and M sand are the mass of residual soil and river sand, D50 soil is the average particle size of sludge, D50 sand is the average particle size of river sand.

8. The method for preparing the organic polluted sludge conditioner for urban drainage pipe network according to claim 4, characterized in that: After adding superphosphate, the pH value of the prepared sludge is 5.0-8.3.

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