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Composite material for efficiently removing phosphorus in wastewater, and preparation method and application of composite material

A composite material and wastewater technology, applied in soil conditioning materials, chemical instruments and methods, applications, etc., can solve the problems of limited adsorption performance and low adsorption efficiency of pollutants, and achieve the goal of promoting sustainable development and realizing multi-stage recycling Effect

Inactive Publication Date: 2020-03-27
NANJING AGRICULTURAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the adsorption performance of natural or native shellfish wastes on pollutants is limited, and the adsorption efficiency is low, and proper performance improvement is required to achieve the desired effect.

Method used

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  • Composite material for efficiently removing phosphorus in wastewater, and preparation method and application of composite material
  • Composite material for efficiently removing phosphorus in wastewater, and preparation method and application of composite material
  • Composite material for efficiently removing phosphorus in wastewater, and preparation method and application of composite material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] A method for preparing a composite material that efficiently removes phosphorus in wastewater, collecting shellfish waste and wheat straw from the seafood market, mixing them and crushing them until the particle size is less than 5 cm, placing them in a pyrolysis device and feeding nitrogen to heat under anaerobic conditions After reaching the set temperature and keeping it for 1 hour, cool down. During the cooling process, nitrogen gas is continuously introduced. After the temperature reaches room temperature, the pyrolysis products are taken out, and the organic carbon, calcium content and specific surface area of ​​each pyrolysis carbon product are measured to analyze the composition of different raw materials. Compare the effect of pyrolysis temperature on the properties of carbonaceous products. Raw material proportioning and cracking temperature of the raw material that embodiment adopts are as shown in table 1:

[0027] Table 1 Different raw materials and pyrolys...

Embodiment 2

[0036] The mixed carbonaceous material obtained in Example 1 was crushed again until the particle size was less than 5 mm, and 10 g was weighed and added to 1.5 L of phosphorus-containing water. After shaking at room temperature for 2 hours, the supernatant was separated by sedimentation, and the adsorbed and fixed phosphate was collected. The carbonaceous sediment was used to verify the adsorption effect of pyrolytic carbon on phosphorus in water. The results are shown in Table 3:

[0037] Table 3 Adsorption and removal effects of pyrolysis carbon materials on phosphorus in different concentrations of phosphorus solutions

[0038]

[0039]

[0040] The results in Table 3 are consistent with the predictions in Example 1, and the phosphorus concentration in phosphorus-containing wastewater using pyrolytic carbon 2 is less than 1600 mg -l The removal rate of phosphorus in water can reach more than 98%, and the maximum adsorption capacity of phosphorus can reach 190 mg g -...

Embodiment 3

[0042] Collect pyrolytic carbon 2, reference carbon 2 and reference carbon 4 in Example 2 that have absorbed phosphate, dry them at 60°C until the moisture content is less than 50%, grind and disperse, weigh 1 gram according to dry weight conversion and add to 200 g contains cadmium (21 mg kg -1 ), lead (817mg kg -1 ), copper (453 mg kg -1 ) and zinc (364 mg kg -1 ) in the heavy metal-contaminated soil, add water after mixing well and control the soil moisture content to 50%, after 2 weeks of cultivation, measure the soil CaCl 2 Extracted heavy metal content to analyze its passivation effect on soil heavy metal ions, the results are shown in Table 4:

[0043] Wherein, soil sample 1 is untreated soil;

[0044] Soil sample 2: soil with pyrolysis carbon 2 after adding 1% adsorbed phosphorus;

[0045] Soil sample 3: the soil of control carbon 2 after adding 1% adsorbed phosphorus;

[0046] Soil sample 4: the soil of control carbon 4 after adding 1% adsorbed phosphorus.

[0...

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Abstract

The invention relates to a composite material for efficiently removing phosphorus in wastewater, and a preparation method and an application of the composite material; the composite material is prepared by the steps: taking a mixture of shell wastes and crop straws as a raw material and carrying out high-temperature thermal cracking under an anaerobic condition to obtain a carbonaceous material; adding the carbonaceous material into phosphorus-containing wastewater, adsorbing phosphate, precipitating and separating to obtain a phosphate-loaded carbonaceous material, and then applying the phosphate-loaded carbonaceous material to adsorption and passivation of heavy metals in contaminated soil. The shell and straw waste resources are fully utilized, mixture thermal cracking carbon with a better phosphorus adsorption effect than that of single thermal cracking or simple compounding of all the raw materials is obtained after high-temperature thermal cracking, the phosphorus-rich carbon material obtained through recovery can be used as a heavy metal contaminated soil conditioner, and the preparation process is green, environmentally friendly and free of pollution.

Description

technical field [0001] The invention relates to the technical field of environmental protection, in particular to a composite material for efficiently removing phosphorus in waste water, a preparation method thereof and an application for passivation of heavy metals in polluted soil. Background technique [0002] In recent years, with the continuous increase of emissions from human activities, phosphorus pollution in water bodies and heavy metal pollution in soil have increasingly become important environmental problems in my country, which has aroused widespread concern in the society. It is well known that phosphorus is an important plant nutrient element and an important limiting factor causing eutrophication of surface water. Its main sources are agricultural planting, urban rainwater runoff, municipal and industrial wastewater, and livestock and poultry manure discharge. For example, in my country's Yangtze River Economic Belt, the proportion of sections with total pho...

Claims

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Application Information

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IPC IPC(8): B01J20/20B01J20/30C02F1/28C09K17/06C02F101/10
CPCB01J20/043B01J20/20B01J2220/485B01J2220/4881C02F1/281C02F1/283C02F2101/105C09K17/06
Inventor 卞荣军连万里潘根兴
Owner NANJING AGRICULTURAL UNIVERSITY
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