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A kind of heavy metal adsorption material suitable for high calcium water quality and its preparation method and application

A technology for adsorbing materials and heavy metals, applied in chemical instruments and methods, adsorbed water/sewage treatment, water pollutants, etc., can solve problems such as high operating costs and large sludge production, avoid secondary pollution, and have good adsorption effects , good processing effect

Active Publication Date: 2018-05-11
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Commonly used heavy metal polluted water purification technologies mainly include chemical precipitation, ion exchange, membrane separation, etc., but these technologies have problems such as large sludge output and high operating costs

Method used

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  • A kind of heavy metal adsorption material suitable for high calcium water quality and its preparation method and application
  • A kind of heavy metal adsorption material suitable for high calcium water quality and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] Embodiment 1, the preparation that is applicable to the heavy metal adsorption material of high calcium water quality

[0044] Biological-physical drying sludge is municipal sludge that has been treated by biological-physical drying process and air-dried (the specific process is to mix municipal sludge with 80% water content and bark with a mass ratio of 2:1, and fill it into a vertical In the cylindrical compost tank (159L), the filling rate is 75%, airtight, and the top is 0.3m 3 / h flow pumping and drainage; at 0.05m 3 / h·kgVS ventilation rate to raise the temperature of the pile, keep it above 65°C for 3-4 days, and then increase the ventilation rate to 3m 3 / h until the treatment is completed; then spread the sludge after biological-physical drying treatment in a shaded and ventilated place until the quality does not change, and sieve and recover the dried sludge. ), the dry basis ash content is about 50%. After the municipal sludge is treated by the biological-...

Embodiment 2

[0054] Embodiment 2, the preparation that is applicable to the heavy metal adsorption material of high calcium water quality

[0055] 3Fe@BC900 and BC900 were prepared according to the preparation method in Example 1; activated carbon (denoted as AC) and BC900 were used as the control adsorption materials. Grind the above three adsorption materials and pass through a 40-mesh sieve (0.45 mm) for subsequent use.

[0056] Containing Cd with groundwater 2+ solution. The properties of the groundwater taken are as follows: Ca 2+ 81.67mg / L, Mg 2+ 38.95mg / L, Na + 25.42mg / L, K + 1.87mg / L, NH 4 + Not detected, NO 3 - 21.06mg / L, Cl - 34.88mg / L, SO 4 2- 70.76mg / L, HCO 3 - 270.15mg / L, CO 3 2- not detected. Cd 2+ stock solution, the Cd(NO 3 ) 2 4H 2 Dissolve O in groundwater, add concentrated nitric acid and dilute to 2000mg / L with groundwater to prepare (HNO 3 0.2%). Cd for experiment 2+ solution, dilute Cd with groundwater according to the required concentration 2...

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Abstract

The invention discloses a heavy metal adsorption material suitable for high-calcium water quality and a preparation method for the heavy metal adsorption material and an application of the heavy metal adsorption material. The heavy metal adsorption material suitable for high-calcium water quality disclosed by the invention is prepared from the following pyrolysis primer: biological-physical dry sludge and reduced iron powder, wherein the mass ratio of the biological-physical dry sludge and the reduced iron powder is (100-10): 1. The preparation method for the heavy metal adsorption material comprises the steps of: 1) mixing the biological-physical dry sludge and the reduced iron powder to obtain the pyrolysis primer; 2) in an inert atmosphere, pyrolyzing the pyrolysis primer; and 3) in the inert atmosphere, cooling the pyrolysis primer treated in the step 2) to obtain the heavy metal adsorption material. According to the heavy metal adsorption material disclosed by the invention, the raw materials are low in price and are easily available, and municipal sludge is recycled, so that secondary pollution caused by municipal sludge is avoided; and the heavy metal adsorbent is good in adsorption effect on heavy metal ions in a water body with a relatively high content of Ca<2+> and is good in treatment effect on sewage.

Description

technical field [0001] The invention relates to a heavy metal adsorption material suitable for high-calcium water quality, a preparation method and application thereof. Background technique [0002] Heavy metals can continue to remain and accumulate in organisms, and even low-dose exposure will seriously endanger ecological safety and human health. Commonly used heavy metal-polluted water purification technologies mainly include chemical precipitation, ion exchange, membrane separation, etc., but these technologies have problems such as large sludge output and high operating costs. In contrast, adsorption is a better technical choice, especially when the heavy metal content in the water column is low. Activated carbon is the most widely used adsorption material. In order to reduce costs, finding efficient and cheap substitutes for activated carbon is the key to the adsorption process. [0003] The output of municipal sludge in our country is large, and it must be properly ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J20/20B01J20/30C02F11/00C02F1/28C02F1/62
CPCB01J20/20B01J2220/42B01J2220/4887C02F1/281C02F11/00C02F2101/20C02F2101/22
Inventor 陈坦王洪涛陆文静周泽宇孟瑞红
Owner TSINGHUA UNIV