Bottom sediment active covering system and method for controlling sedimentary phosphate release

A phosphorus release and sediment technology, applied in chemical instruments and methods, sludge treatment, river regulation, etc., can solve the problems of reduction effect, slow fixation rate, and unsatisfactory efficiency, and achieve reduction of phosphorus release and fixation rate Fast, fast and efficient effect

Inactive Publication Date: 2012-11-14
SHANGHAI OCEAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this sediment active overburden system constructed of a single calcite material has obvious defects: (1) Calcite usually fixes phosphorus slowly in water, which causes the sediment active overburden system constructed of calcite to inhibit The efficiency of phosphorus release in mud is not very ideal; (2) The thickness of the sediment active covering system constructed by a single calcite is often relatively thin, and it is easily affected by water erosion, wind waves, aquatic animal disturbance, etc., which leads to this sediment activity. The integrity of the overall structure of the overburden system is easily damaged by external conditions such as water flow, wind waves, and aquatic animals, thereby reducing the effect of this active sediment overlay system on controlling the release of phosphorus in the sediment.
However, there are no reports on the products and methods for controlling the release of phosphorus from the sediment by using the composition of calcite and hydroxyapatite

Method used

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  • Bottom sediment active covering system and method for controlling sedimentary phosphate release
  • Bottom sediment active covering system and method for controlling sedimentary phosphate release
  • Bottom sediment active covering system and method for controlling sedimentary phosphate release

Examples

Experimental program
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Effect test

Embodiment 1

[0025] Please refer to figure 1 , figure 1 It is a structural schematic diagram of a bottom mud active covering system for controlling the release of bottom mud phosphorus in the present invention. The bottom mud active covering system is provided with two layers of geotextiles 2, and a layer of bottom mud covering material layer 3 is arranged between the two layers of geotextiles 2, and the bottom mud covering material layer 3 is weight ratio A composition of calcite and hydroxyapatite of 5:1-1000:1, wherein the particle diameters of the calcite and hydroxyapatite are both 6 mesh to 600 mesh.

[0026] When in use, the bottom mud active covering system of the present invention can be spread directly on the bottom mud 1 .

[0027] It should be noted that the geotextile layer 2 is made of woven geotextiles and non-woven geotextiles. Since the geotextiles have excellent filtering, drainage, isolation, reinforcement, seepage prevention, and protection functions, they can protect...

Embodiment 2

[0029] 1. Firstly, hydroxyapatite was synthesized by solution precipitation method. 50 mL of 1mol / L Ca(NO 3 ) 2 solution with 30 mL of 1 mol / L (NH 4 ) 2 HPO 4 The solution was mixed with 0.8 mol / L NH 3 OH solution to adjust the pH to 9, then place the mixture in a shaker, shake it at a speed of 150 rpm for 48 hours, take the precipitate and wash it to neutral, dry it to obtain hydroxyapatite, and then crush it into a particle size of over 200 mesh particles. Repeat the above process 4 times, and collect all the hydroxyapatite samples for later use. Purchase calcite, crush the calcite, and sieve to obtain calcite with a particle size of over 300 mesh.

[0030] 2. Collect the surface sediment of polluted ponds. Weigh 1000 g of surface sediment and put them into three 2.5 L brown glass bottles, so that the thickness of the bottom mud in each brown glass bottle is about 6 cm. The sludge in each amber glass bottle was treated differently. The sediment in the first brown g...

Embodiment 3

[0033] 1. Firstly, hydroxyapatite was synthesized by solution precipitation method. 50 mL of 1 mol / L Ca(NO 3 ) 2 solution with 30 mL of 1 mol / L (NH 4 ) 2 HPO 4 The solution was mixed with 0.8 mol / L NH 3 OH solution to adjust the pH to 9, then place the mixture in a shaker, shake it at a speed of 150 rpm for 48 hours, take the precipitate and wash it to neutral, dry it to obtain hydroxyapatite, and then crush it into a particle size of over 200 mesh particles. Repeat the above process 4 times, and collect all the hydroxyapatite samples for later use. Purchase calcite, crush the calcite, and sieve to obtain calcite with a particle size of over 300 mesh.

[0034] 2. Collect the surface sediment of polluted ponds. Weigh 1000 g of surface sediment and put them into three 2.5 L brown glass bottles, so that the thickness of the bottom mud in each brown glass bottle is about 6 cm. The sludge in each amber glass bottle was treated differently. The mud in the first brown glass...

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Abstract

The invention provides a bottom sediment active covering system for controlling sedimentary phosphate release. The bottom sediment active covering system comprises two earthwork cloth layers and a bottom sediment covering material layer between the two earthwork cloth layers, wherein the bottom sediment covering material layer is a combination comprising calcite and hydroxyapatite with the weight ratio of 5:1-1000:1, and particle sizes of the calcite and the hydroxyapatite are both 6-600 meshes. The invention also provides an application of the bottom sediment active covering system for controlling sedimentary phosphate release. The bottom sediment active covering system has the advantages that the earthwork cloth layers can be used for effectively preventing the integrity of a whole structure of the bottom sediment covering material layer from being damaged by the external conditions, and the disabled bottom sediment covering material layer is also simple to regularly change; the bottom sediment covering material layer is formed by the combination of the calcite and the hydroxyapatite with the weight ratio of 5:1-1000:1, so that release of bottom sediments can be effectively inhibited, fixing velocity of phosphate in the bottom sediments is rapid, and the fixing efficiency is high; and the bottom sediment active covering system is economic and is suitable to be widely popularized.

Description

technical field [0001] The invention relates to the technical field of controlling the release of phosphorus from surface water polluted bottom mud, in particular to a bottom mud active covering system and method for controlling the release of bottom mud phosphorus. Background technique [0002] With the rapid development of my country's social economy, population growth and the acceleration of urbanization, the amount of sewage produced is increasing day by day, while the sewage treatment rate in my country is relatively low, resulting in a large amount of untreated sewage that meets the standards directly entering the water body of our country, resulting in serious pollution of water bodies. At present, many water bodies in our country have already experienced serious eutrophication. Phosphorus is one of the key nutrient elements that cause eutrophication in water bodies, and sediment is an important destination and storage pool for phosphorus entering water bodies. When ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E02B3/02C02F1/28C02F11/00
Inventor 詹艳慧林建伟
Owner SHANGHAI OCEAN UNIV
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