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Preparation method and application of high adsorption performance water supply plant residual mud non-sintered ceramsite

A water supply plant, high adsorption technology, applied in the direction of adsorption water/sewage treatment, chemical instruments and methods, water/sludge/sewage treatment, etc., can solve the problem of low adsorption capacity of ceramsite residue in water supply plants and reduce residual sludge in water supply plants Iron-aluminum activity, preparation of non-fired ceramsite and other issues, to achieve the effect of low equipment investment cost and operating cost, high porosity, and simple preparation process

Active Publication Date: 2018-06-19
湖南省环境保护科学研究院
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Problems solved by technology

The high-temperature roasting method consumes a lot of energy to prepare ceramsite, and high-temperature roasting reduces the activity of iron and aluminum in the residual sludge of the water supply plant. The prepared ceramsite has a low adsorption capacity of the residual sludge of the water supply plant, and further activation is needed to strengthen its adsorption capacity.
For example, the Chinese invention patent application number CN201611064123.7 discloses a method for activating sludge-based ceramsite in water supply plants to enhance its phosphorus absorption effect. g
[0004] The contents of silicon dioxide and iron / aluminum oxides in the residual sludge of water supply plants basically meet the raw material requirements of unfired ceramsite, but there are still no relevant research reports on the use of residual sludge from water supply plants to prepare unfired ceramsite
At the same time, there are few studies on the preparation of non-fired ceramsite with high adsorption performance, and they mainly focus on the preparation of non-fired ceramsite with certain adsorption capacity by using fly ash as the main raw material.

Method used

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  • Preparation method and application of high adsorption performance water supply plant residual mud non-sintered ceramsite

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preparation example Construction

[0030] refer to Figure 1-6 , the specific implementation method adopts the following technical scheme: a kind of preparation method of unfired ceramsite of residual mud of a water supply plant with high adsorption performance, and its steps are:

[0031] (1) Raw material pretreatment: Grind the residual mud of the water supply plant, cement, fly ash and activator respectively, and mix them according to a certain mass ratio. %, activator 2%-6%, fly ash 10%-20%;

[0032] (2) Granulation: Add 32-35ml of an aqueous solution containing 2%-5% water glass to the homogeneously mixed raw materials in step (1), stir and put it into a pelletizer to granulate to obtain a spherical shape with a particle diameter of 5-10mm Ceramsite raw materials;

[0033] (3) Steaming: place the ceramsite raw meal at room temperature for 2-3 hours, and then put it in a sterilizing pot at 70-90°C for 10-14 hours;

[0034] (4) Aging: The steamed ceramsite is naturally air-dried and aged at room temperatu...

Embodiment 1

[0038] Example 1: A preparation method of non-fired ceramsite with high adsorption performance for water supply plant residual mud: the main raw material is the residual mud of a water supply plant in Changsha City. The residual mud is mainly composed of Si, Al and Fe, and its main components are shown in the table 1.

[0039] Table 1 Main component content of water supply plant residual mud and unfired ceramsite

[0040]

[0041]After drying, crushing and grinding the residual mud of the water supply plant to 100 meshes, mix it with activator, fly ash and ordinary Portland cement in a certain mass ratio, and add 2%-5% of Put the water glass solution (binder) into the granulator to prepare unfired ceramsite raw meal, place the raw meal at room temperature for 2-3 hours, then place it in a 70-90°C sterilizing pot for 12 hours, and then Put it in a drying oven to air-dry and age for 24 hours. The unfired ceramsite prepared from the residual mud of the water supply plant has...

Embodiment 2

[0042] Example 2: Use of a high-adsorption performance unburned ceramsite for residual mud in water supply plants: The adsorption capacity of unburned ceramsite for residual mud in water supply plants to lead:

[0043] Weigh 4 pieces (total mass is about 0.5g) of the unfired ceramsite in the water supply plant in Example 1 into a 50mL centrifuge tube, and add 30mL Pb solutions with different concentrations of pH 5.00, wherein the KCl concentration is 0.01mol / L. The sample was shaken in a constant temperature shaking box at 25°C and 150rpm for 8h (the adsorption equilibrium time was determined to be 8h by the adsorption kinetic experiment), and then centrifuged at 4500g for 15min, and the supernatant was taken to measure the lead concentration. According to the change of the lead concentration in the initial aqueous solution and the supernatant, the equilibrium adsorption amount of unfired ceramsite to lead was calculated. The adsorption isotherm data of unfired ceramsite on le...

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Abstract

Relating to the technical field of water treatment, the invention discloses a preparation method and application of a high adsorption performance water supply plant residual mud non-sintered ceramsite. The preparation steps include: mixing air dried and grinded water supply plant residual mud with cement, an activator, fly ash and the like evenly, adding a water glass binder and then performing granulation, placing a ceramsite raw material in a 70-90DEG C sterilization pot and performing steam curing for 12h, then conducting air drying and aging for 2-3d, thus obtaining the water supply plantresidual mud non-sintered ceramsite. The preparation method provided by the invention has the advantages of simplicity, cheap and easily available raw materials, low equipment investment and operationcost, and the prepared non-sintered ceramsite has excellent adsorption effect, can be applied as an adsorption material in a wastewater treatment process, and has strong adsorption capacity on heavymetals, phosphorus, anionic organic pollutants and the like. The invention builds a new bridge for application of water supply plant residual mud laboratory study to water treatment technology, can provide a new solution for wastewater pollutant emission reduction and WTR disposal, and is beneficial to achieve the win-win goal of "waste control by waste".

Description

technical field [0001] The invention relates to the technical field of water treatment, in particular to a preparation method and application of non-fired ceramsite for residual mud in water supply plants with high adsorption performance. Background technique [0002] Residual sludge in water supply plants is a by-product produced in the process of water supply treatment. It is mainly composed of flocculants and colloids and organic matter carried in raw water. A large number of studies have confirmed that residual sludge in water supply plants is a safe and non-toxic waste. The amount of residual sludge produced by water supply plants is large, with an annual output of tens of millions of tons worldwide. In my country, the output of Shanghai alone exceeds 133,000 tons per year. The disposal method of existing water plant residual sludge is mainly landfill, but with the shortage of land and the possible overload of environmental capacity caused by land filling, how to dispos...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/26C02F1/28C02F101/20C02F101/22C02F101/30
CPCC02F1/281C02F2101/20C02F2101/22C02F2101/30C04B28/26C04B18/0418C04B18/08C04B7/02C04B22/064C04B22/143
Inventor 赵媛媛许友泽付广义向仁军成应向钟宇刘丹妮
Owner 湖南省环境保护科学研究院
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