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Method for processing waste liquid containing calcium citrate

A technology of calcium citrate and treatment method, applied in flocculation/precipitation water/sewage treatment, separation/purification of carboxylic acid compounds, organic chemistry, etc., can solve the problem of affecting the neutralization yield, difficulty in sedimentation and recovery, and increasing the burden of environmental protection treatment And other issues

Inactive Publication Date: 2012-02-22
COFCO BIOTECHNOLOGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In the calcium salt method, the calcium citrate crystals generated by the contact reaction between citric acid and calcium carbonate will aggregate together to form spherical crystal clusters. The larger the spherical crystal clusters, the faster the sedimentation; Clusters, because the particles are small, it is difficult to settle and recover the calcium citrate in it. The calcium citrate is suspended in the solution to form a calcium citrate suspension that looks turbid. Direct environmental protection treatment will not only affect the neutralization yield, but also Will increase the burden of environmental protection

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  • Method for processing waste liquid containing calcium citrate

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Effect test

Embodiment 1

[0026]This embodiment is used to illustrate the treatment method of the wastewater containing calcium citrate provided by the invention.

[0027] (1) 500mL of waste liquid containing calcium citrate is placed in a settling tank, and the waste liquid is heated to 50°C;

[0028] (2) Sodium alginate with a number average molecular weight of 32000 is dissolved in water to obtain a sodium alginate aqueous solution with a concentration of 15 ppm; and under stirring, the waste liquid obtained in step (1) is mixed with the sodium alginate aqueous solution ; Based on the waste liquid containing calcium citrate per cubic meter, the addition of the sodium alginate aqueous solution makes the consumption of sodium alginate be 0.15 kilograms, and flocs appear after stirring and mixing for 5 minutes;

[0029] (3) Add 4 kilograms of perlite (purchased from Linglong Thermal Insulation Material Factory, Pingqiao District, Xinyang City, Henan Province) to the mixed solution obtained in step (1),...

Embodiment 2

[0031] This embodiment is used to illustrate the treatment method of the wastewater containing calcium citrate provided by the invention.

[0032] (1) 500mL of waste liquid containing calcium citrate is placed in a settling tank, and the waste liquid is heated to 70°C;

[0033] (2) Potassium alginate with a number average molecular weight of 32000 is dissolved in water to obtain a potassium alginate aqueous solution with a concentration of 10 ppm; and under stirring, the waste liquid obtained in step (1) is mixed with the potassium alginate aqueous solution ; Based on the waste liquid containing calcium citrate per cubic meter, the addition of the potassium alginate aqueous solution makes the consumption of potassium alginate be 0.1 kilogram, and flocs appear after stirring and mixing for 0.5 minutes;

[0034] (3) Add 3 kilograms of activated carbon (purchased from Beijing Guanghua Jingke Co., Ltd.) into the mixed solution obtained in step (1), after stirring for 10 seconds, s...

Embodiment 3

[0036] This embodiment is used to illustrate the treatment method of the wastewater containing calcium citrate provided by the invention.

[0037] (1) 500mL of waste liquid containing calcium citrate is placed in a settling tank, and the waste liquid is heated to 60°C;

[0038] (2) dissolving sodium alginate with a number average molecular weight of 200,000 in water to obtain a sodium alginate aqueous solution with a concentration of 5 ppm; and mixing the waste liquid obtained in step (1) with the sodium alginate aqueous solution under stirring ; Based on the waste liquid containing calcium citrate per cubic meter, the addition of the sodium alginate aqueous solution makes the consumption of sodium alginate be 0.05 kg, and flocs appear after stirring and mixing for 2 minutes;

[0039] (3) 2 kilograms of diatomite (purchased from Linjiang Sailit Company) are added to the mixed solution obtained in step (1), after stirring for 20 seconds, stop stirring, and after standing for 3 ...

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Abstract

The invention provides a method for processing waste liquid containing calcium citrate, which comprises the following steps: mixing and standing the waste liquid containing the calcium citrate, flocculent solutions and filter aid; and performing solid-liquid separation to obtain solid phase product and liquid phase product. The flocculent solutions are one or more of sodium alginate, alginate potassium, chitin and chitosan. The filter aid is one or more of pearlite, diatomite, activated carbon and asbestos. The waste liquid is processed by means of the method, citric acid can be effectively recovered, no pollution to the environment is caused, and high benefit can be gained in environment and economic aspects.

Description

technical field [0001] The invention relates to a treatment method for waste liquid containing calcium citrate. Background technique [0002] Citric acid, also known as citric acid, its chemical name is 2-hydroxypropanetricarboxylic acid. It is widely distributed in plants such as lemons, currants and raspberries. Citric acid has a pleasant sour taste, refreshing taste, no aftertaste, and is completely non-toxic. It is the most important edible organic acid with the largest production and consumption in the world. It is widely used in food, medicine, daily chemical and other industries. middle. [0003] At present, the domestic citric acid extraction method is mainly the calcium salt method, that is, under certain temperature and pH conditions, using the extremely small solubility of calcium citrate tetrahydrate in water, the calcium carbonate and the solution in the rinsing kettle are mixed. When the citric acid contacts, a neutralization reaction occurs, and calcium cit...

Claims

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Application Information

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IPC IPC(8): C02F1/52C07C59/265C07C51/42C07C51/02
Inventor 满云卢宗梅陈静文廖四祥徐丽红
Owner COFCO BIOTECHNOLOGY CO LTD
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