Method for preparing livestock wastewater adsorbent from acid modified kaolin

A technology of kaolin and acid modification, which is applied in the field of environmental pollutant adsorption materials, and can solve problems such as poor effect of bentonite on wastewater treatment

Inactive Publication Date: 2017-03-15
JIANGSU OPEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

For example, after montmorillonite, the main mineral in bentonite, is dispersed in water medium, part of it begins to separate under the action of the surface electric double layer, and the

Method used

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  • Method for preparing livestock wastewater adsorbent from acid modified kaolin
  • Method for preparing livestock wastewater adsorbent from acid modified kaolin
  • Method for preparing livestock wastewater adsorbent from acid modified kaolin

Examples

Experimental program
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Effect test

Embodiment 1

[0020] Embodiment 1: Preparation of livestock and poultry wastewater phosphorus adsorption material:

[0021] 1) Screening of natural kaolin: There are two kinds of kaolin for testing, which are from Jiangsu Suzhou (KL-1) and Sinopharm Co., Ltd. (KL-2). Accurately weigh 0.5g of two different kaolin mineral materials into a 150mL centrifuge tube, add 50mL of simulated wastewater with a phosphorus concentration of 50mg / L at a constant temperature (20±1)°C, shake at 180r / min for 1h, and let stand for 24h , centrifuge at 4 000r / min for 10min, separate the supernatant, measure the phosphorus content, calculate the amount of phosphorus adsorbed according to the concentration change, and screen out the kaolin with phosphorus adsorption capacity as the next experimental material.

[0022] 2) Preparation of modified kaolin with different acid concentrations: Take 30 g of kaolin in a round bottom flask, add 250 mL of hydrochloric acid solution with different concentrations (1%, 3%, 9% b...

Embodiment 2

[0030] Embodiment 2: Comparison of the adsorption capacity of different concentrations of acid-modified kaolin to phosphorus:

[0031] Accurately weigh 0.5 g of the acid-modified sample into a 150 mL centrifuge tube, and add 25 mL of simulated wastewater solution with a phosphorus concentration of 20 mg / L. Under constant temperature (20±1)°C, shake at 200r / min for 24h, centrifuge at 4000r / min for 10min, separate the supernatant, and measure the concentration of phosphorus. According to the change of initial and final concentration, calculate the amount of phosphorus adsorbed by it. The results showed that with the increase of the amount of acid, the adsorption capacity of modified kaolin for phosphorus gradually increased ( figure 2 ). Considering the consumption cost and practical operability of hydrochloric acid, the maximum dosage of hydrochloric acid in this test is 9% (V / V). When the amount of acid is 9%, the adsorption capacity of kaolin to phosphorus is 0.82mg / g, an...

Embodiment 3

[0032] Embodiment 3: the adsorption isotherm curve of optimum concentration acid-modified kaolin to phosphorus:

[0033] Accurately weigh 0.5g of the best acid-modified sample and its natural sample into a 150mL centrifuge tube, add 50mL of phosphorus containing , 200, 400mg / L simulated wastewater solution. Shake at a constant temperature (20±1)°C for 24 hours, and the rest of the steps are the same as above, and draw the phosphorus isotherm adsorption curve. The adsorption of phosphorus by natural kaolin increases with the concentration of phosphorus in the solution, and the slope of the curve gradually decreases from large to finally reaches equilibrium, showing the characteristics of monomolecular layer adsorption. It can be seen that with the increase of phosphorus adsorption by kaolin, its The adsorption affinity of phosphorus gradually decreases; while the acid-modified kaolin increases with the increase of phosphorus concentration, the slope of the curve increases at f...

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Abstract

The invention relates to a method for preparing livestock wastewater adsorbent from acid modified kaolin, comprising the following steps: screening of natural kaolin: weighing different kaolin mineral materials into a centrifuge tube, and adding phosphorus-containing concentration simulation wastewater under the condition of constant temperature; oscillating and standing, carrying out centrifugal separation on a supernatant, measuring content of phosphorus, calculating phosphorus adsorption quantity according to change of concentration, and screening kaolin with high phosphorus adsorption capacity; and preparation of acid modified kaolin: adding a hydrochloric acid solution into the kaolin, stirring at constant temperature, cooling and centrifuging, washing solid sediments with distilled water until there is no Cl<->, drying, and sieving to obtain an acid modified kaolin sample. Phosphorus saturation adsorption of the acid modified kaolin is greatly enhanced. It is found through researches that 9% acid modified kaolin has the best phosphorus adsorption performance. Adsorbing capacity of the kaolin in the invention is increased by 44.6% in comparison with adsorbing capacity of natural kaolin, and removal rate is 81.9%.

Description

technical field [0001] The invention belongs to the field of environmental pollutant adsorption materials, in particular to a method for preparing a phosphorus adsorbent in livestock and poultry wastewater by using kaolin, which is applied to water environment pollution control. Background technique [0002] The modification of environmental mineral materials is one of the main methods of deep processing of mineral materials. Through modification, the ion exchange type and exchangeability of environmental mineral materials can be changed, the internal porosity and expansion of the mineral structure can be changed, and the adsorption of minerals can be improved. and various other physical and chemical properties. At present, there are various types of modification of environmental mineral materials, which can be divided into physical modification, chemical surface modification, and nano-environmental mineral powder surface modification. Among them, the commonly used ones are...

Claims

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Application Information

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IPC IPC(8): B01J20/12C02F1/28B01J20/30C02F101/10
CPCB01J20/12C02F1/286C02F2101/105
Inventor 干方群杭小帅关莹黄兆琴唐荣秦品珠张晓谢伟芳
Owner JIANGSU OPEN UNIV
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