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Preparation method and application of constructed wetland dephosphorization matrix

A technology of constructed wetlands and substrates, applied in the field of water pollution control, can solve problems such as high organic matter interference that is difficult to overcome

Pending Publication Date: 2022-02-08
NANJING INST OF GEOGRAPHY & LIMNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] The purpose of the present invention is to provide a preparation method and application of a constructed wetland dephosphorization substrate, aiming at the currently non-commercialized and mature constructed wetland dephosphorization substrates in the world, and the currently used constructed wetland substrates generally have low phosphorus fixation capacity, The pH value of the effluent is alkaline, and it is difficult to overcome the interference of high organic matter in the incoming water. A phosphorus-fixing material that uses clay minerals and biochar as raw materials and simultaneously supports lanthanum-aluminum or only lanthanum is proposed. A low-cost, high-capacity constructed wetland matrix prepared by calcination

Method used

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  • Preparation method and application of constructed wetland dephosphorization matrix
  • Preparation method and application of constructed wetland dephosphorization matrix
  • Preparation method and application of constructed wetland dephosphorization matrix

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0052] Embodiment 1: Comparative embodiment of sintering temperature and load type selection parameters

[0053] A preparation method for a constructed wetland dephosphorization substrate, comprising the following steps:

[0054] (1) Take the attapulgite raw ore (medium-grade or high-grade attapulgite raw ore; calcium oxide content≤10% in the attapulgite raw ore), physically sieve, remove impurities, mechanically pulverize after drying, and sieve (the mesh number is greater than 100 mesh ), obtain the attapulgite clay powder, for subsequent use; get biochar, mechanically pulverize, sieve (mesh number greater than 100 orders), obtain biochar powder, for subsequent use;

[0055] (2) Take the attapulgite clay powder and biochar powder with a mass ratio of 1:1 and mix them evenly, then mix the mixed material with the load liquid, fully infiltrate for 30 hours, and obtain the mixed material, the moisture content of the mixed material is 15%, and extrude , making a columnar carrier w...

specific Embodiment

[0058] Concrete embodiment parameter sees the following table one:

[0059]

[0060] Table I

[0061] Detection experiment:

[0062] According to the scheme disclosed in Example 1 (A1-A5, B1-B5, C1-C5), the corresponding phosphorus removal substrates were prepared, and detected respectively according to the following methods:

[0063] 1. Material loss rate: Take 1-2g of phosphorus removal matrix, put it in 100ml deionized water, shake it at constant temperature for 24 hours, and calculate the material loss rate. Material loss rate (%) = lost material dry weight / material weight.

[0064] Specific test results such as figure 1 , figure 2 , image 3 Shown: where figure 1 Material loss rate of phosphorus removal substrates prepared for schemes A1-A5; figure 2 Material loss rate of phosphorus removal substrates prepared for schemes B1-B5; image 3 Material loss rates of phosphorus removal substrates prepared for schemes C1-C5.

[0065] Depend on Figure 1-Figure 3 It...

Embodiment 2

[0070] Embodiment 2: Parameter control test of load liquid load mass fraction

[0071] A preparation method for a constructed wetland dephosphorization substrate, comprising the following steps:

[0072] (1) Take the attapulgite raw ore (medium-grade or high-grade attapulgite raw ore; calcium oxide content≤10% in the attapulgite raw ore), physically sieve, remove impurities, mechanically pulverize after drying, and sieve (the mesh number is greater than 100 mesh ), obtain the attapulgite clay powder, for subsequent use; get biochar, mechanically pulverize, sieve (mesh number greater than 100 orders), obtain biochar powder, for subsequent use;

[0073] (2) Take the attapulgite clay powder and biochar powder with a mass ratio of 1:1 and mix them evenly, then mix the mixed material with the load liquid, fully infiltrate for 30 hours, and obtain the mixed material, the moisture content of the mixed material is 15%, and extrude , making a columnar carrier with a diameter of 6 mm a...

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Abstract

The invention discloses a preparation method and application of a constructed wetland dephosphorization matrix, and provides a method for preparing a phosphorus fixing material by using clay minerals and biochar as raw materials, through synchronously loading of lanthanum and aluminum or only lanthanum aiming at the common problems of low phosphorus fixation capacity, alkaline effluent pH value, difficulty in overcoming high organic matter interference in incoming water, poor mechanical strength and the like existing in the conventional constructed wetland matrix. And the constructed wetland matrix with low cost and high phosphorus fixation capacity is prepared through extrusion forming and high temperature roasting. According to the scheme, the preparation method comprises the following steps: physically mixing and stirring clay mineral powder and biochar, putting a lanthanum chloride and polyaluminum chloride mixed solution (or an independent lanthanum chloride solution) in a certain mass ratio into the mixed material, and firing at a high temperature for 1-2 hours, thereby obtaining the product. The method has the advantages that the method is simple and low in cost, and the prepared phosphorus removal matrix material has the advantages of being large in phosphorus fixing capacity, high in water permeability, high in mechanical hardness, free of secondary pollution and free of residual waste liquid.

Description

technical field [0001] The invention relates to the technical field of water pollution control, in particular to a preparation method and application of a constructed wetland phosphorus removal substrate. Background technique [0002] A large number of studies have shown that phosphorus is the limiting factor of lake eutrophication, and the increase of phosphorus concentration in lake water will cause algal blooms. Therefore, controlling the concentration and level of phosphorus in lakes is considered to be the key to lake eutrophication management. The sources of phosphorus in lakes are mainly divided into endogenous and exogenous sources. Exogenous sources mainly refer to the input from rivers, and strengthening the input of exogenous phosphorus is an effective means of lake eutrophication management and control. Constructed wetland refers to the water treatment technology developed on the basis of natural or semi-natural purification system. It is a kind of artificial w...

Claims

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Application Information

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IPC IPC(8): C02F3/32C02F101/10
CPCC02F3/32C02F2101/105
Inventor 尹洪斌
Owner NANJING INST OF GEOGRAPHY & LIMNOLOGY
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