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A polluted sediment covering ball and its preparation method and application

A technology for polluting bottom mud and spherical centers, applied in the direction of water pollutants, sludge treatment, chemical instruments and methods, etc., can solve the problems of reducing long-term effects, and achieve the goals of promoting adsorption, good in-situ repair, and protecting human health Effect

Inactive Publication Date: 2018-06-22
SHANGHAI OCEAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, although the blanket blanket system prepared by wrapping powdered zirconium-modified zeolite in geotextiles can effectively control the release of nitrogen and phosphorus from sediment, the densely packed powdered zirconium-modified zeolites in the upper and lower geotextile layers will hinder the release of nitrogen and phosphorus in the overlying water. Dissolved oxygen migrates to the surface of the sediment. Under the anaerobic state, the sediment may release a large amount of pollutants into the interstitial water of the sediment, which will reduce the long-term effectiveness of the overburden system to control the release of pollutants from the sediment.

Method used

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  • A polluted sediment covering ball and its preparation method and application
  • A polluted sediment covering ball and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] (1) Preparation of zirconium modified zeolite:

[0042] ① Crushing, sieving and cleaning the natural zeolite to obtain zeolite particles with a particle size of 60-80 mesh;

[0043] ② Take 5 containers of the same specification, add 10g of the zirconium-modified zeolite particles prepared in step ① and 100mL of water to these 5 containers, and then add 15g, 12.5g, 10g, 7.5 g and 5 g zirconium oxychloride octahydrate;

[0044] ③Then heat the solutions in the 5 containers to 100°C and keep this temperature for a period of time, so that the solutions in the containers are gradually evaporated to dryness;

[0045] ④Wash the solid material repeatedly with water until the pH value of the cleaning solution is about 6, and the obtained material is zirconium-modified zeolite, which will be 1.5g / g, 1.25g / The zirconium-modified zeolites prepared under the conditions of g, 1.0g / g, 0.75g / g and 0.5g / g are marked as ZrMZ-1.5, ZrMZ-1.25, ZrMZ-1.0, ZrMZ-0.75 and ZrMZ-0.5.

[0046] (...

Embodiment 2

[0057] (1) The preparation of zirconium-modified zeolite is the same as in Example 1; wherein, the zirconium-modified zeolite is prepared under the condition that the mass ratio of zirconium oxychloride octahydrate to natural zeolite is 0.5 g / g.

[0058] (2) the preparation of calcium-type zeolite is with embodiment 1;

[0059] (3) The preparation of the 1.3cm sludge bottom mud covering ball with a diameter:

[0060] ① Take a circular geotextile of a certain size, put a certain amount of granular zirconium-modified zeolite, and then wrap the geotextile around the zirconium-modified zeolite particles (ZrMZ-0.5) to make the overall shape into a spherical shape. The geotextile material is removed with scissors, and the closure is sutured with thread or iron wire, and finally a zirconium-modified zeolite particle ball with a diameter of 0.5cm is formed;

[0061] ②Take a circular geotextile with an area larger than that of the geotextile in ①, spread a certain amount of 60-80 mesh...

Embodiment 3

[0063] Application of sludge and bottom sludge covering ball: Take a container with a bottom width of about 7.5cm and a length of about 10cm. The height of the container is about 23cm. The polluted bottom mud covering ball 500g pollution covering ball prepared in the embodiment 1 of bottom mud and embodiment 2 makes the polluted bottom mud covering ball evenly cover the top of the bottom mud, utilizes calcium type zeolite and zirconium in the polluted bottom mud covering ball The modified zeolite adsorbs the ammonia nitrogen and phosphorus released from the sediment, so as to achieve the purpose of controlling the release of ammonia nitrogen and phosphorus from the sediment. The specific process diagram is as follows figure 2 shown.

[0064] Through laboratory experiments and studies, the inhibition rate of the release of ammonia nitrogen and phosphorus from the bottom mud by using the polluted bottom mud covering balls prepared in Examples 1 and 2 can reach more than 90%. ...

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Abstract

The invention belongs to the technical field of environment protection and particularly relates to a contaminated bottom mud covering ball as well as a preparation method and an application thereof. The diameter of the contaminated bottom mud covering ball is 0.5-5 cm; a zirconium modified zeolite particle layer is located in the center of the contaminated bottom mud covering ball, and the diameter of the center of the contaminated bottom mud covering ball is 0.2-2 cm; the zirconium modified zeolite particle layer is wrapped with inner-layer geotechnical cloth; a calcium-type zeolite layer is arranged outside the inner-layer geotechnical layer and is 0.3-3 cm thick; the calcium-type zeolite layer is wrapped with outer-layer geotechnical cloth. With the adoption of the contaminated bottom mud covering ball, larger pores can be reserved, dissolved oxygen in overlying water can reach the surface layer of bottom mud more easily, pollutants in the bottom mud can be prevented from releasing and entering interstitial water, degradation of the pollutants in the bottom mud is facilitated, and the inhibition ratio of release of ammonia nitrogen and phosphorus in the bottom mud can reach 90%.

Description

technical field [0001] The invention belongs to the technical field of environmental protection, and in particular relates to a polluted bottom mud covering ball and a preparation method and application thereof. Background technique [0002] Eutrophication of surface water is one of the major water environmental problems facing the world. Nitrogen and phosphorus are important nutrients that lead to eutrophication of surface waters. The sources of nitrogen and phosphorus in water bodies include exogenous input (agricultural non-point source input, industrial and urban domestic sewage point source discharge, etc.) to an important role. Therefore, controlling the release of nitrogen and phosphorus in surface water is very important for the prevention and control of eutrophication. [0003] Currently, sediment nitrogen and phosphorus release control technologies are divided into two categories: in-situ control technology and ex-situ control technology. The ectopic control te...

Claims

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Application Information

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IPC IPC(8): C02F11/00B01J20/16B01J20/28B01J20/30C02F101/16
CPCB01J20/165B01J20/28009C02F11/00C02F2101/16
Inventor 林建伟詹艳慧王春峰邢云青王星星
Owner SHANGHAI OCEAN UNIV