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Method and device for treating heavy metal waste water by ambient-temperature ferrite cycle treatment process

A cyclic treatment, ferrite technology, applied in chemical instruments and methods, water/sewage multi-stage treatment, water/sludge/sewage treatment, etc., can solve the problems of low effluent standard and high energy consumption, and achieve high drainage quality , low sedimentation rate, the effect of performance optimization can be used

Active Publication Date: 2015-10-21
NORTHEASTERN UNIV LIAONING
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0004] The object of the present invention is to provide a method and device for the normal temperature ferrite circulation treatment of heavy metal sewage, which can effectively solve the problems in the prior art, especially the traditional ferrite circulation treatment method with an operating temperature of 70°C and low energy consumption. Relatively high, while the effluent standard is low, and a large amount of sludge needs to be treated in depth

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  • Method and device for treating heavy metal waste water by ambient-temperature ferrite cycle treatment process
  • Method and device for treating heavy metal waste water by ambient-temperature ferrite cycle treatment process
  • Method and device for treating heavy metal waste water by ambient-temperature ferrite cycle treatment process

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Embodiment 1

[0039] Embodiment 1: a kind of method of normal temperature ferrite circulation processing heavy metal sewage, such as figure 1 shown, including the following steps:

[0040] S1, 0.75g ferrous sulfate heptahydrate is added in 600mL, the sewage that heavy metal total content is 50mg / L (described sewage is the sewage that contains Cu, Zn, Cr and Ni ion), aerobic stirring is uniform under normal temperature (not more than 2min); then add 131.25ml of sodium hydroxide solution with a molar concentration of 1mol / L, and stir for 30min without air;

[0041] S2, then carry out natural settlement of sewage for 24 hours, after settlement, carry out solid-liquid separation;

[0042] S3, after the solid-liquid separation, the supernatant liquid (ie sewage) is discharged, and the sludge of the lower floor 100ml is taken out for subsequent use;

[0043] S4, adding heavy metal ion content to the sludge is 600ml of sewage with a content of 50mg / L (the amount of sewage is determined by the to...

Embodiment 2

[0050] Embodiment 2: a kind of method of normal temperature ferrite circulation processing heavy metal sewage, such as figure 1 shown, including the following steps:

[0051] S1, add 0.75g of ferrous sulfate heptahydrate into 600ml of sewage containing 50mg / L of heavy metal Cu, and stir evenly with oxygen at room temperature; then add 131.25ml of sodium hydroxide with a molar mass of 1mol / L, and stir in isolation from the air 30min;

[0052] S2, then carry out natural settlement of sewage for 24 hours, after settlement, carry out solid-liquid separation;

[0053] S3, after the solid-liquid separation, the supernatant liquid (ie sewage) is discharged, and the sludge of the lower floor 100ml is taken out for subsequent use;

[0054] S4, adding 500ml of sewage containing 10mg / L of heavy metal Cu and 91.88ml of sodium hydroxide solution with a molar mass of 1mol / L to the sludge, and aerobic stirring for 15min to obtain magnetic sludge;

[0055] S5, this magnetic sludge is added...

Embodiment 3

[0059] Embodiment 3: a kind of method of normal temperature ferrite circulation processing heavy metal sewage, such as figure 1 shown, including the following steps:

[0060] S0, under normal temperature conditions, add hydrated lime to the sewage (the sewage contains one or more substances in Cu, Zn, Cr, Ni, Cd or Pb) for neutralization pretreatment, so that the pH value of the sewage is 5 ~8;

[0061] S1, add 0.8g of ferrous sulfate heptahydrate into 833ml of sewage with a heavy metal content of 80mg / L, and stir evenly with oxygen at room temperature; then add 120ml of sodium hydroxide solution with a molar mass of 1mol / L, and stir for 15min without air ;

[0062] S2, then carry out natural settlement of sewage for 24 hours, after settlement, carry out solid-liquid separation;

[0063] S3, after solid-liquid separation, the supernatant liquid (ie sewage) is discharged, and the lower layer of sludge is taken out for standby;

[0064] S4, add 96ml, the sodium hydroxide sol...

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Abstract

The invention discloses a method and a device for treating heavy metal waste water by an ambient-temperature ferrite cycle treatment process. The method comprises the following steps of: S1, firstly adding ferrous sulfate heptahydrate into waste water to obtain a mixture, and aerobically stirring the mixture uniformly at the ambient temperature; adding sodium hydroxide into the mixture, and stirring the mixture for 15-30 minutes by isolating air; S2, then, naturally settling the waste water, and carrying out solid-liquid separation on the waste water after settling; S3, after solid-liquid separation, discharging a supernatant liquid and getting out lower-layer sludge for later use; S4, adding sodium hydroxide into the sludge and stirring the sludge for 15 minutes in air to obtain magnetic sludge; and S5, adding the magnetic sludge and the ferrous sulfate heptahydrate in step S1 into the waste water. According to the method, various heavy metal ions in waste water can be effectively removed once at the ambient temperature; the reaction time is short; the water quality of the discharged water is high; sludge in a cyclic process has magnetism; and the magnetic sludge can be recycled.

Description

technical field [0001] The invention relates to a method and a device for circulating heavy metal sewage with ferrite at normal temperature, belonging to the field of heavy metal sewage treatment. Background technique [0002] The problem of heavy metal pollution in my country's water is very prominent, and has developed from an environmental problem to a social problem. With the improvement of environmental requirements, the country's heavy metal sewage discharge standards are becoming more and more stringent, and the drainage requirements of electroplating, semiconductor, and mining industries are also getting higher and higher. Therefore, it is necessary to develop new processes to meet the increasing environmental protection standards. [0003] At present, the commonly used heavy metal sewage treatment methods are: chemical precipitation method, reverse osmosis method, ion exchange method and adsorption method. Among them, the chemical precipitation method is the most s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04C02F101/20
Inventor 王海旺郑楠楠郭壮志孙中祥姜贤涛王欣徐雪峰林慧凤温刘平王柄筑索彪尹文超朱碧珊
Owner NORTHEASTERN UNIV LIAONING
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