Method for improving adsorption performance of ceramsite, modified ceramsite and application of modified ceramsite

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

Active Publication Date: 2020-04-03
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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  • Method for improving adsorption performance of ceramsite, modified ceramsite and application of modified ceramsite
  • Method for improving adsorption performance of ceramsite, modified ceramsite and application of modified ceramsite
  • Method for improving adsorption performance of ceramsite, modified ceramsite and application of modified ceramsite

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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 adsorption performance of ceramsite, modified ceramsite and application of the modified ceramsite. The method comprises the following steps: in a solution containing organic matters, reducing ferric iron in an iron-rich matrix into ferrous iron by adopting dissimilatory iron reducing bacteria to obtain ferrous water; and introducing the ferrous water and a solution rich in nitrate nitrogen into ceramsite inoculated with ferrous oxidation denitrifying bacteria, and carrying out oxidation treatment to obtain the modified ceramsite. The method is simple, low in energy consumption and low in cost; the adsorption removal rate of the modified ceramsite on pollutants such as phosphorus and cadmium can reach 90% or above and is far higher than that of unreinforced original ceramsite, and the modified ceramsite is relatively rapid and stable in adsorption effect and not prone to desorption. The modified ceramsite is used for removing phosphorus-containing inorganic matters 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 Applications(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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