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Preparation method of urban river polluted bottom mud active covering plate

A technology for polluting bottom mud and covering plates, applied in water pollutants, sludge treatment, polluted waterways/lakes/ponds/rivers, etc., can solve the problem of thinning and failure of covering layers, suspension of covering materials, and high flow rate of river water To achieve the effect of good water permeability, uniform coverage and simple construction procedures

Active Publication Date: 2019-08-23
HUAQIAO UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when urban rivers are flooded and drained, the flow velocity of the river is relatively high and the scouring intensity is high, causing the covering materials to be suspended and lost, resulting in the thinning of the traditional covering layer and gradually failing.

Method used

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  • Preparation method of urban river polluted bottom mud active covering plate
  • Preparation method of urban river polluted bottom mud active covering plate
  • Preparation method of urban river polluted bottom mud active covering plate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Example 1 Experimental research on the permeability coefficient, water retention, and erosion loss ratio of bottom mud active covering slabs

[0027] (1) Implementation process

[0028] In this example, the variation ranges of the permeability coefficient, water retention and scouring loss ratio of the bottom sludge active covering board made of different mass ratios of calcined modified sludge particles, cement and fly ash were studied.

[0029] In this example, a total of 16 mass ratios of calcined modified sludge particles, cement and fly ash were taken. The calcined modified sludge particles were all 180g, and the quality of cement and fly ash was appropriately changed. The change in cement quality was divided into: 4 groups, number 1~4#; 1#: cement 40g, fly ash respectively 50, 60, 70, 80g; 2#: cement 50g, fly ash respectively 50, 60, 70, 80g; 3#: 60g of cement, 50, 60, 70, 80g of fly ash; 4#: 70g of cement, 50, 60, 70, 80g of fly ash; the water-binder ratio is 0....

Embodiment 2

[0045] Example 2 Research on the Effect of Bottom Sludge Active Cover Board on Nitrogen and Phosphorus Reduction in Water

[0046] (1) Test plan

[0047]The test was carried out in a transparent square plexiglass cylinder of 16cm×16cm×16cm; the test water was self-mixed water, the concentration of ammonia nitrogen in the water was 48.06mg / L, and the concentration of orthophosphate was 4.98mg / L.

[0048] The covering boards used in the test are: ① Made of calcined modified sludge particles, cement and fly ash as raw materials, in which 180g of calcined modified sludge particles, 50g of cement, and 70g of fly ash are called calcined modified sludge. Sludge group; ②Using calcined modified sludge particles, zeolite, cement and fly ash as raw materials, in which calcined modified sludge particles 150g, zeolite 70g, cement 50g, fly ash 70g, called calcined modified sludge Mud + zeolite group.

[0049] In the test, there were 9 plexiglass cylinders, which were divided into 3 groups...

Embodiment 3

[0057] Example 3 Study on the effect of active covering plate on controlling the release of nitrogen and phosphorus from sediment

[0058] (1) Test plan

[0059] The test was carried out in a transparent square plexiglass tank of 16cm×16cm×16cm; the sediment in each plexiglass tank was about 1.15kg, and the thickness was about 5cm. The mud is covered with a board covering length×width=15cm×15cm and the thickness is about 0.5cm; the overlying water is tap water; using the principle of siphon, tap water is slowly added into the tank along the tank wall through a plastic hose, and the volume of the overlying water is about 2L.

[0060] The active cover plates used in the test are: ① Made of calcined modified sludge particles, cement and fly ash as raw materials, including 180g of calcined modified sludge particles, 50g of cement, and 70g of fly ash, which is called calcined modified sludge. Sludge group; ② It is made of sand, cement and fly ash as raw materials, and the amount ...

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Abstract

The invention discloses a preparation method of an urban river polluted bottom mud active covering plate. The preparation method comprises the following steps: (1) collecting sludge of water purification plants to prepare sludge cakes, and calcining the sludge cakes at 380-450 DEG C for 3.5-4.5 hours to prepare sludge blocks; (2) carrying out mechanical crushing and mechanical vibration screeningon the sludge blocks to prepare the calcining modified sludge particles with a particle size of 1-5 mm; (3) adding 17-18 parts of the calcining modified sludge particles, 4-6 parts of cement and 5-8 parts of fly ash into a stirrer according to a water-cement ratio of 0.26-0.29, uniformly carrying out mixing, and carrying out standing to enable the aggregate and the binder to be fully mixed; (4) adding the stirred bottom material into a mold frame for pressing, wherein the pressing time is 60-80 seconds, and the pressing pressure is 0.75-0.8 MPa; (5) carrying out demolding to obtain a coveringplate 12-16 hours after compression molding; and (6) standing the covering plate finished product under a natural outdoor condition at a temperature of 20-25 DEG C for 12-16 days, wherein the obtainedcovering plate can be used for engineering application. The covering plate prepared by the method has the advantages of good water permeability, high water retention, washing resistance and the like.

Description

technical field [0001] The invention belongs to the technical field of sludge resource treatment, and in particular relates to a preparation method of an active covering plate of urban river channel polluted bottom mud. Background technique [0002] With the development of our country's society and chemical industry, the ecological environment of urban river water bodies is worrying, especially the problem of eutrophication of river water bodies is particularly prominent. The main limiting factors of water eutrophication are nitrogen and phosphorus. The continuous accumulation of nitrogen and phosphorus in river water makes the water eutrophication more serious. As the government has increased its investment in manpower and material resources to control the water environment, it has achieved certain results in sewage interception and discharge limitation, so that exogenous nitrogen and phosphorus have been controlled. The endogenous source (sediment) is the sink and source ...

Claims

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Application Information

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IPC IPC(8): B01J20/10B01J20/28B01J20/30C02F11/00C02F1/28C02F101/16C02F101/10
CPCB01J20/103B01J20/02B01J20/28014B01J20/3078B01J20/3042B01J20/3007C02F11/00C02F1/281B01J2220/42B01J2220/4887C02F2101/16C02F2101/105C02F2209/14C02F2209/18C02F2103/007
Inventor 周真明林灿阳田委民田雨润叶沛成吴雪菲
Owner HUAQIAO UNIVERSITY
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