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,

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

Example Embodiment

[0026] Example 1 Experimental study on permeability coefficient, water retention, and scour loss ratio of active cover board in bottom mud

[0027] (1) Implementation process

[0028] In this example, the variation range of the permeability coefficient, water retention, and scour loss ratio of the bottom sludge active cover plate made of different mass ratios of calcined modified sludge particles, cement and fly ash was studied.

[0029] In this example, a total of 16 mass ratios of calcined modified sludge particles, cement and fly ash are taken. The calcined modified sludge particles are all 180g. The quality of cement and fly ash changes appropriately, and the change in cement quality is divided into 4 groups, numbered 1~4#; 1#: cement 40g, fly ash is 50, 60, 70, 80g; 2#: cement 50g, fly ash is 50, 60, 70, 80g; 3#: Cement is 60g, fly ash is 50, 60, 70, 80g; 4#: cement is 70g, fly ash is 50, 60, 70, 80g; the water-binder ratio is 0.26~0.29 according to the situation.

[0030] In th...

Example Embodiment

[0045] Example 2 Study on the reduction effect of the active cover plate of bottom mud on nitrogen and phosphorus 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-dispensing water, the ammonia nitrogen concentration of the dispensed water was 48.06mg / L, and the orthophosphate concentration was 4.98mg / L.

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

[0049] There are 9 plexiglass tanks in the exper...

Example Embodiment

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

[0058] (1) Test plan

[0059] The experiment was carried out in a transparent square plexiglass tank of 16cm×16cm×16cm; the bottom mud in each plexiglass tank was about 1.15kg and the thickness was about 5cm. The bottom mud was taken from the surface bottom mud of Bailu Lake on the Xiamen campus of Huaqiao University; The mud is covered with a plate covering length×width=15cm×15cm and a thickness of about 0.5cm; the overlying water is tap water; using the principle of siphon, the tap water is slowly added to the cylinder along the cylinder wall through a plastic hose, and the overlying water volume is about 2L.

[0060] The active cover plates used in the test are as follows: ① It is made of calcined modified sludge particles, cement and fly ash as raw materials, of which 180g of calcined modified sludge particles, 50g of cement and 70g of fly ash are call...

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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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