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Heavy metal precipitant, preparation method thereof and heavy metal wastewater treatment method

A heavy metal precipitation and wastewater treatment technology, applied in the direction of flocculation/sedimentation water/sewage treatment, water/sewage treatment, water/sludge/sewage treatment, etc., can solve the problems of difficult control and high cost, and achieve simple control and reduce The effect of preparation cost and stable quality

Inactive Publication Date: 2016-01-13
湖南中金岭南康盟环保科技有限公司
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Problems solved by technology

[0006] The invention provides a heavy metal precipitant and its preparation method and heavy metal wastewater treatment method to solve the technical problem that the existing heavy metal precipitant is not easy to control and has high cost in the preparation process

Method used

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  • Heavy metal precipitant, preparation method thereof and heavy metal wastewater treatment method
  • Heavy metal precipitant, preparation method thereof and heavy metal wastewater treatment method
  • Heavy metal precipitant, preparation method thereof and heavy metal wastewater treatment method

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preparation example Construction

[0030] refer to figure 1 , the preferred embodiment of the present invention provides a kind of preparation method of heavy metal precipitation agent, comprises the following steps:

[0031] S110: in Fe 2+ A regulator is added to the aqueous solution until the pH value is 10.0-13.0.

[0032] S120: Stir the reaction at 10-35° C. until the first oxidation-reduction potential measured with the calomel electrode as the reference electrode is -500--700 mv, and obtain the precipitate produced by the reaction to obtain a heavy metal precipitant.

[0033] Among them, the regulator is NaOH, KOH, Ca(OH) 2 one or more of.

[0034] Fe 2+ The aqueous solution can be prepared by adding ferrous salts to water, and the concentration of ferrous salts is limited to the fact that the ferrous salts added are insoluble in water, that is, Fe 2+ The aqueous solution is a saturated solution. The regulator is an alkaline substance, and the regulator is NaOH, KOH, Ca(OH) 2 one or more of. The a...

Embodiment 1

[0053] refer to image 3 Preparation of heavy metal precipitant and treatment of heavy metal wastewater.

[0054] Add 30L of tap water and 0.3kg of ferrous sulfate (heptahydrate) to the heavy metal precipitant preparation tank, turn on the agitator, continue to add sodium hydroxide to the preparation tank, adjust the pH of the solution to 10.0, and the solution temperature to 20°C. When the oxidation-reduction potential of the solution in the preparation tank reaches -600mv, stop stirring, and the precipitation in the preparation tank is the heavy metal precipitant (1#). After determination, the precipitant quality (dry weight) is 0.056kg, and Fe in the precipitant 3+ with Fe 2+ The molar ratio of = 2:1.

[0055] Heavy metal wastewater (1m 3 ) enters the sedimentation reaction tank after the wastewater regulating tank, and simultaneously adds the prepared heavy metal precipitant (1#) in the wastewater, and stirs and reacts for 0.5h. The ratio of the numbers is 11.3:1, the...

Embodiment 2

[0059] refer to image 3 Preparation of heavy metal precipitant and treatment of heavy metal wastewater.

[0060] The difference from Example 1 is that in Example 2, the ferrous salt is 20.0 kg of ferrous sulfate (heptahydrate), KOH is added to the preparation tank, the pH of the solution is adjusted to 11.0, and the solution temperature is 10°C. When the redox potential of the solution in the preparation tank reaches -500mv, stop stirring. After measuring, the precipitant quality (dry weight) in the preparation tank is 3.733kg, and Fe in the precipitant 3+ with Fe 2+ The molar ratio of =2:1.5. When processing heavy metal wastewater, the stirring reaction time in the precipitation reaction tank is 10 minutes. At this time, the ratio of the molar number of Fe in the heavy metal precipitant to the total molar number of heavy metals in the wastewater is 753.3:1, and the pH value is 8.0. The second The oxidation-reduction potential is -100mv.

[0061] After being treated by t...

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Abstract

The invention discloses a heavy metal precipitant, a preparation method thereof and a heavy metal wastewater treatment method. The preparation method of the heavy metal precipitant comprises the steps that modifiers are added into Fe2+ water solution to regulate the pH value between 10.0 and 13.0; the mixture is stirred and subjected to reaction until calomel electrodes are adopted as reference electrodes to measure the first oxidation-reduction potential between minus 500mv and minus 700mv; sediment produced in reaction is acquired, and then the heavy metal precipitant is obtained, wherein the modifiers include one or more of NaOH, KOH and Ca(OH)2. According to the preparation method of the heavy metal precipitant, only relatively cheap ferrous salt is adopted as an iron source needed for preparing the heavy metal precipitant, so that the preparation cost of the heavy metal precipitant is greatly lowered; moreover, the oxidation-reduction potential and the pH value are used as control parameters in the preparation process, so control is easy and convenient, and stable quality of the heavy metal precipitant can be guaranteed.

Description

technical field [0001] The invention relates to the field of heavy metal wastewater treatment, in particular to a preparation method of a heavy metal precipitant. In addition, the present invention also relates to the heavy metal precipitating agent prepared by the preparation method of the heavy metal precipitating agent and the heavy metal wastewater treatment method. Background technique [0002] Heavy metal wastewater mainly comes from smelting, electroplating, mining, chemical and other industries. Heavy metals in wastewater, such as cadmium, lead, arsenic, mercury, chromium, etc., are very harmful environmental pollutants. Heavy metals mainly affect the environment and human health through the accumulation of food chains. Long-term intake of excessive heavy metals by the human body can lead to teratogenicity, mutagenesis, carcinogenicity and other various diseases. Therefore, how to economically and effectively treat heavy metal wastewater has become the focus of cur...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/52C02F1/62C02F101/20
Inventor 姜科周康根彭佳乐杨有才潘希贤
Owner 湖南中金岭南康盟环保科技有限公司
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