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A method for improving the adsorption performance of ceramsite, modified ceramsite and its application

A technology of adsorption performance and ceramsite, which is applied in the field of environmental material preparation, can solve the problems of high energy consumption and high investment, and achieve the effect of small economic investment, low cost and fast adsorption effect

Active Publication Date: 2021-11-26
SOUTH CHINA AGRI UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

These methods mainly use ferric ions to settle under alkaline conditions and combine measures such as high-temperature calcination to make iron oxides adhere to the surface of ceramsite. The preparation process consumes a lot of energy and investment, and has certain safety risks.

Method used

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  • A method for improving the adsorption performance of ceramsite, modified ceramsite and its application
  • A method for improving the adsorption performance of ceramsite, modified ceramsite and its application
  • A method for improving the adsorption performance of ceramsite, modified ceramsite and its application

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Embodiment 1

[0039] The construction of embodiment 1 reaction system

[0040] (1) Construction system: The material of the reaction column is PVC round pipe, which is divided into a ferrous dissolution column with a height of 52cm and a packing column (ceramic column) with a height of 67cm. The ferrous dissolution column uses iron-rich iron widely distributed in South China. The soil is used as the iron supply source of the system (iron-rich matrix layer), and the filler column (ceramsite column) contains ceramsite with a particle size of 1-2 cm to be modified, and its adsorption performance is poor;

[0041]A lower water inlet and an upper water outlet are respectively set at the positions of 4.5cm and 40cm from the bottom of the ferrous iron dissolution column, wherein the lower water inlet is used to input the iron reduction induction solution (solution containing organic matter) into the interior of the ferrous iron dissolution column , the upper water outlet is used to output ferrous-...

Embodiment 2

[0047] Example 2 Modified ceramsite adsorption of phosphorus and cadmium

[0048] The adsorption properties of modified ceramsite to phosphorus and cadmium in water were determined by static adsorption experiments. Using a 150mL Erlenmeyer flask as the adsorption device, according to the first-level discharge standard of "Pollutant Discharge Standards for Urban Sewage Treatment Plants" (GB18918-2002) and the "Electroplating Pollutant Discharge Standards" (GB21900-2008) water pollution discharge limits for newly-built enterprises Value preparation of phosphorus and cadmium reaction solution. The original ceramsite and the modified ceramsite (the total iron content of the modified ceramsite in Example 1=93.1~103mg / g) were tested respectively for their adsorption and removal performance, wherein the solid-liquid ratio was 5: 100 (mass ratio). After shaking at 25°C, 150r / min, and pH=7 for 24 hours, measure the remaining total phosphorus (TP) and Cd in the solution. TP is determin...

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Abstract

The invention belongs to the technical field of environmental materials, and discloses a method for improving the adsorption performance of ceramsite, modified ceramsite and an application thereof. Method: In a solution containing organic matter, use dissimilatory iron-reducing bacteria to reduce ferric iron in the iron-rich matrix to ferrous to obtain ferrous-containing water; pass the ferrous-containing water and the solution rich in nitrate nitrogen into the The ceramsite inoculated with the ferrous oxidation denitrifying bacteria is oxidized to obtain the modified ceramsite. The method of the present invention is simple, low in energy consumption, and low in cost; the adsorption and removal rate of the modified ceramsite to pollutants such as phosphorus and cadmium can reach more than 90%, which is much higher than that of unstrengthened original ceramsite, and the adsorption effect is relatively fast, Stable and not easy to desorb. The modified ceramsite is used for removing phosphorus-containing inorganic substances and / or cadmium-containing heavy metals in sewage.

Description

technical field [0001] The invention belongs to the field of environmental material preparation, and in particular relates to a method for improving the adsorption performance of ceramsite, modified ceramsite and applications thereof. Background technique [0002] Ceramsite is a kind of artificial lightweight aggregate formed by sintering solid waste or clay as raw materials. It has the characteristics of heat resistance, light weight and good thermal shock resistance. It is a more commonly used building material. In recent years, ceramsite has been gradually studied and applied in the field of sewage treatment. The characteristics of high specific surface area, large porosity and strong chemical stability make it very suitable as filter tank or artificial wetland filler, and remove phosphorus and heavy metals in water through filtration or adsorption. pollutants. However, due to the variety of raw materials, the adsorption performance of ceramsite products on the market va...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J20/10B01J20/30C02F1/28C02F101/20C02F101/30
CPCB01J20/08B01J20/10C02F1/281C02F2101/20C02F2101/30
Inventor 种云霄粟畅仲海涛胡星宝林洛莹余光伟龙新宪
Owner SOUTH CHINA AGRI UNIV
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