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Method for treating chromium-containing wastewater with low concentration through Leersia hexandra Swartz cultivation

A low-concentration, chromium wastewater technology, applied in cultivation, plant cultivation, metallurgical wastewater treatment and other directions, can solve the problems of decreased removal rate, poor treatment effect, secondary pollution, etc., to reduce treatment costs and save chemical consumption. , the effect of simplifying the processing process

Inactive Publication Date: 2017-05-10
周荣
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem mainly solved by the present invention is that the current common treatment method shows a higher removal rate when dealing with high-concentration chromium-containing wastewater, but under low-concentration and near-neutral conditions, the removal rate drops significantly, and most of the treated Poor effect, easy to produce the defect of secondary pollution, provide a kind of culture solution that utilizes ferrous sulfate to cultivate Lishihe seedlings, then plant it in the cultivation soil rich in hydrophilic matrix, use Lishihe To absorb and enrich the method for heavy metal chromium, the present invention utilizes Lishihe seedlings to absorb ferrous ions, firstly reduce hexavalent chromium to trivalent chromium through ferrous ions, and then use the hydrophilic carboxyl hydroxyl group in the cultivation soil to convert the chromium The water molecules around the ions are adsorbed to expose the chromium ions. Finally, the photosynthesis of Li Shihe and the roots and stems are used to absorb and enrich the exposed chromium ions, so as to achieve the purpose of treating chromium-containing wastewater. The present invention treats chromium-containing wastewater. The waste water method has a simple treatment process, easy-to-obtain raw materials, and a high removal rate for low-concentration chromium-containing waste water, without any secondary pollution, and has broad application prospects

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0019] Select full-grained Lishihe seeds and soak them in deionized water for 2 days, then take them out, sow the soaked seeds into the plowed soil, and when the seeds germinate and grow to a plant height of 5 cm, take out Lishihe seedlings and move them into the greenhouse , cultivated to a seedling height of 8cm under the conditions of a temperature of 20°C, a light time of 8h, a light intensity of 1300Lux, and a relative air humidity of 60%; in parts by weight, 90 parts of calcium nitrate, 50 parts of potassium nitrate, and 11 parts of phosphoric acid were weighed. Ammonium dihydrogen and 10 parts of ferrous sulfate were dissolved in 1000 parts of distilled water, and the culture medium was obtained after stirring evenly with a glass rod. The seedlings cultivated in the above-mentioned greenhouse were moved into the culture liquid, and continued to be cultivated for 7 days at normal temperature until the roots of the seedlings were obtained. A large amount of white fibrous r...

example 2

[0022] Select full-grained Lishihe seeds and soak them in deionized water for 3 days, then take them out, sow the soaked seeds into the plowed soil, and when the seeds germinate and grow to a plant height of 6 cm, take out Lishihe seedlings and move them into the greenhouse , cultivated to a seedling height of 9cm under the conditions of a temperature of 23°C, a light time of 9h, a light intensity of 1350Lux, and a relative air humidity of 65%; in parts by weight, 91 parts of calcium nitrate, 53 parts of potassium nitrate, and 11 parts of phosphoric acid were weighed. Ammonium dihydrogen and 15 parts of ferrous sulfate were dissolved in 1300 parts of distilled water, stirred evenly with a glass rod to obtain a culture solution, and the seedlings cultivated in the above-mentioned greenhouse were moved into the culture solution, and continued to be cultivated for 9 days at normal temperature until the roots of the seedlings were obtained. A large amount of white fibrous roots app...

example 3

[0025] Select full-grained Lishihe seeds and soak them in deionized water for 3 days, take them out, and spread the soaked seeds into the plowed soil. When the seeds germinate and grow to a plant height of 7cm, take out Lishihe seedlings and move them into the greenhouse , cultivated to a seedling height of 10cm under the conditions of a temperature of 25°C, a light time of 10h, a light intensity of 1400Lux, and a relative air humidity of 70%; in parts by weight, 92 parts of calcium nitrate, 55 parts of potassium nitrate, and 12 parts of phosphoric acid were weighed. Ammonium dihydrogen and 20 parts of ferrous sulfate were dissolved in 1500 parts of distilled water, stirred evenly with a glass rod to obtain a culture solution, and the seedlings cultivated in the above-mentioned greenhouse were moved into the culture solution, and continued to be cultivated at room temperature for 10 days until the roots of the seedlings A large number of white fibrous roots appear, and the pret...

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Abstract

The invention relates to a method for treating chromium-containing wastewater with low concentration through Leersia hexandra Swartz cultivation and belongs to the field of wastewater treatment. According to the method, Leersia hexandra Swartz seedlings are utilized to absorb ferrous ions, hexavalent chromium is firstly reduced into trivalent chromium by the aid of the ferrous ions, water molecules around chromium ions are adsorbed by hydrophilic carboxyl in cultivating soil, the chromium ions are enabled to be exposed, finally, the exposed chromium ions are adsorbed and enriched through photosynthesis of Leersia hexandra Swartz and by root hair and stems of the Leersia hexandra Swartz, and accordingly, the purpose of chromium-containing wastewater treatment is achieved; the method for treating the chromium-containing wastewater adopts a simple treatment process and available raw materials, has high removal rate of the chromium-containing wastewater with low concentration, produces no secondary pollution and has broad application prospect.

Description

technical field [0001] The invention relates to a method for cultivating and treating low-concentration chromium-containing wastewater, belonging to the field of wastewater treatment. Background technique [0002] Chromium is a major pollutant in the environment, and an important source of it is electroplating wastewater. With the development of science and technology, the scale of the electroplating industry is getting bigger and bigger, and the amount of chromium-containing wastewater discharged is also increasing. If it is not treated effectively, it will cause great harm to the environment. There are many valence states of chromium in the water environment, mainly trivalent chromium and hexavalent chromium. Hexavalent chromium is highly toxic and is a recognized carcinogen, which is extremely harmful to the human body. Trivalent chromium is less toxic and is an essential trace element for humans and animals. [0003] The treatment methods of chromium-containing wastew...

Claims

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Application Information

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IPC IPC(8): C02F3/32A01G1/00C02F101/22C02F103/16
CPCC02F3/32A01G22/00C02F2101/22C02F2103/16
Inventor 周荣张晶
Owner 周荣
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