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Nano-hydroxyapatite loofah sponge composite filler as well as preparation method and application thereof

A nano-hydroxyapatite and composite filler technology is applied in chemical instruments and methods, aerobic and anaerobic process treatment, water pollutants, etc. The effect of shortening hydraulic retention time, avoiding insufficient C/N ratio, and reducing cost

Active Publication Date: 2021-08-06
PINGXIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Some scholars use the high-temperature drying method to modify the loofah with hydroxyapatite and make it into a powdered form, which has a certain heavy metal adsorption effect, but destroys the original porous shape of the loofah, and cannot realize the biological filler as activated sludge. The effect of hanging net

Method used

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  • Nano-hydroxyapatite loofah sponge composite filler as well as preparation method and application thereof
  • Nano-hydroxyapatite loofah sponge composite filler as well as preparation method and application thereof
  • Nano-hydroxyapatite loofah sponge composite filler as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] A preparation method of nano-hydroxyapatite loofah composite filler, said method comprising the following steps:

[0035] refer to figure 1 , S1: Take a loofah with a moisture content of 5-10% and soak it in hydrogen peroxide with a mass concentration of 30%, take it out after soaking for 2 hours, and dry it; specifically, you can directly buy the finished loofah and dry it until the moisture content is 5% -10%, you can also dry the picked loofah until the moisture content is 5-10%, then peel, remove the seeds, and get the loofah after removing the two ends; then soak the loofah with the moisture content of 5-10% in quality Concentration of 30% hydrogen peroxide, its purpose is to remove the colloid in the loofah, increase the fiber content of the loofah, soak it for 2 hours, take it out and dry it.

[0036] S2: the loofah after drying in step S1 was placed in Ca(NO 3 ) 2 4H 2 Soak in O solution for 8h; specifically, at first, weigh Ca(NO 3 ) 2 4H 2 O and adjust ...

Embodiment 2

[0042] use Image 6The shown bioreactor processes the landfill leachate of a waste incineration plant. The filler used in the bioreactor is the nano-hydroxyapatite loofah composite filler prepared in Example 1. First, the nano-hydroxyapatite loofah is composited The filler is cut into a square with a side length of 80mm, and then filled into PP porous suspension balls of φ100, and the porous suspension balls are connected by yarns, such as Figure 4 shown.

[0043] After analysis, the COD value in the landfill leachate is high, the B / C ratio is 0.22, and the biodegradability is poor. The water quality is shown in Table 1.

[0044] Table 1 Water quality of landfill leachate

[0045]

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Abstract

The invention discloses a nano-hydroxyapatite loofah sponge composite filler as well as a preparation method and application thereof, and relates to the technical field of wastewater treatment. The method comprises the following steps: soaking loofah sponge with the water content of 5-10% in hydrogen peroxide with the mass concentration of 30% for 2 hours, and then taking out and airing the loofah sponge; soaking the aired loofah sponge in a Ca (NO3) 2.4 H2O solution for 8 hours; dropwise adding diammonium hydrogen phosphate into the Ca (NO3) 2.4 H2O solution according to the molar ratio of Ca to P of 1.67: 1, then adjusting the pH value to 9-9.5 by adopting ammonia water with the volume concentration of 10-15%, and stirring for 4-5 hours; washing the loofah sponge obtained in the previous step, and drying the loofah sponge at 75-78 DEG C for 24 hours; and repeating the steps for three times to obtain the nano-hydroxyapatite loofah sponge composite filler. When the nano-hydroxyapatite loofah sponge composite filler disclosed by the invention is used for adsorbing heavy metals in landfill leachate, the optimal adsorption rate of Pb is as high as 59%, the optimal adsorption rate of Cr is as high as 92.31%, and the adsorption effect is remarkable.

Description

technical field [0001] The invention relates to the technical field of wastewater treatment, in particular to a nano-hydroxyapatite loofah composite filler and a preparation method and application thereof. Background technique [0002] Around 2000, my country's urban domestic waste increased rapidly. For this reason, the country vigorously built waste landfills. So far, most landfills have been used for 20 years. With the increase of landfill time, the content of heavy metals in landfill leachate shows an increasing trend, and the content of heavy metals such as As, Mn, Zn, Pb, Cd, Cr and Ni is relatively high. . [0003] In order to solve this problem, some people use biochemical methods to treat landfill leachate. However, due to the poor biodegradability of landfill leachate, and most heavy metals have an inhibitory effect on the nitrifying and denitrifying bacteria, leading to the gradual emergence of CMBR in the later stage of operation and maintenance. Poor microbial...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F3/30C02F103/06C02F101/20C02F101/30
CPCC02F3/302C02F3/301C02F2103/06C02F2101/20C02F2101/30Y02W10/10
Inventor 王宗丽李佳欣熊军郭海峰王海舟黎晓航熊晶
Owner PINGXIANG UNIV