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Red mud-based composite flocculating agent for domestic sewage treatment and preparation method thereof

A composite flocculant and domestic sewage technology, which is applied in water/sludge/sewage treatment, water/sewage treatment, flocculation/sedimentation water/sewage treatment, etc. It can solve the limitations of application range, low scum production, mutagenesis, etc. problem, to achieve good flocculation effect, reduce processing difficulty and improve activity

Inactive Publication Date: 2019-01-04
肇庆中奥检测咨询有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Inorganic flocculants are cheap, but they will have adverse effects on human health and the ecological environment; although organic polymer flocculants are used in a small amount, the scum output is small, the flocculation ability is strong, the flocs are easy to separate, and the effect of removing oil and suspended matter is good , but the residual monomers of this type of polymer have "three-caused" effects (causal, carcinogenic, and mutagenic), thus limiting its application range

Method used

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  • Red mud-based composite flocculating agent for domestic sewage treatment and preparation method thereof
  • Red mud-based composite flocculating agent for domestic sewage treatment and preparation method thereof

Examples

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preparation example Construction

[0024] The invention provides a preparation method of a red mud-based composite flocculant for domestic sewage treatment, comprising the following steps:

[0025] (1) Add waste sulfuric acid to the red mud, stir and mix, let stand for 30-60 minutes, filter, dry the filtrate, grind and refine to obtain red mud powder with a particle size of 90-100 mesh, and set aside;

[0026] (2) Adding coal powder to the red mud powder, mixing evenly and roasting at high temperature to obtain activated red mud powder;

[0027] (3) Add magnesium aluminum silicate to the activated red mud powder, spray the ethanol solution of ethylene glycol diglycidyl ether into the process of stirring and mixing, after stirring and mixing evenly, put it into a vacuum drying oven and dry to constant weight, That is, the composite flocculant is obtained.

[0028] The red mud mentioned in the present invention is the polluting waste slag discharged during the extraction of alumina in the aluminum industry. Gene...

Embodiment 1

[0044] A preparation method of composite flocculant, comprising the following steps:

[0045] (1) Add waste sulfuric acid to the red mud, stir and mix, filter after standing for 40 minutes, dry the filtrate, grind and refine to obtain red mud powder with a particle size of 90 mesh, and set aside;

[0046] Wherein, the addition amount of the waste sulfuric acid is based on the pH value of the supernatant after stirring, mixing and standing still; 6.0~7.0;

[0047] (2) Add coal powder to the red mud powder, the weight ratio of the red mud powder to coal powder is 1:0.4;

[0048] After mixing evenly, perform high-temperature roasting at a temperature of 500°C and a pressure of -100 MPa in the roaster, and naturally cool after roasting to obtain activated red mud powder;

[0049] (3) Add magnesium aluminum silicate to the activated red mud powder, spray the ethanol solution of ethylene glycol diglycidyl ether into the process of stirring and mixing, after stirring and mixing even...

Embodiment 2

[0052] As in the preparation method of the composite flocculant provided in Example 1, the difference is that in step (3), the weight ratio of the activated red mud powder, magnesium aluminum silicate, ethylene glycol diglycidyl ether, and ethanol is 1 :0.2:0.05:0.3;

[0053] With the rest unchanged, the composite flocculant was prepared according to the preparation method of Example 1.

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Abstract

The invention belongs to the technical field of sewage treatment, and particularly relates to a red mud-based composite flocculating agent for domestic sewage treatment and a preparation method thereof. The preparation method comprises the following steps: (1), adding waste sulfuric acid to red mud, mixing by stirring, standing, then filtering, drying a filtered substance, and refining by grindingto obtain red mud powder; (2), adding coal powder into the red mud powder, uniformly mixing and then calcinating at high temperature to obtain activated red mud powder; and (3), adding magnesium aluminum silicate into the activated red mud powder, spraying an ethanol solution of ethylene glycol diglycidyl ether in the stirring mixing process, uniformly mixing by stirring, and then drying in a vacuum drying box till the constant weight to obtain the composite flocculating agent. The red mud is used as a starting material, and the red mud is neutralized and activated, so that the activity of the red mud is improved; in addition, through compounding of the red mud and the magnesium aluminum silicate, the prepared composite flocculating agent can effectively reduce the treatment difficulty ofdomestic sewage and improve the treatment efficiency of the domestic sewage.

Description

technical field [0001] The invention belongs to the technical field of sewage treatment, and in particular relates to a red mud-based composite flocculant for domestic sewage treatment and a preparation method thereof. Background technique [0002] Domestic sewage is the wastewater discharged from residents' daily life, mainly from residential buildings and public buildings, such as residences, institutions, schools, hospitals, shops, public places and industrial enterprise toilets. The pollutants contained in domestic sewage are mainly organic matter (such as protein, carbohydrate, fat, urea, ammonia nitrogen, etc.) and a large number of pathogenic microorganisms (such as parasite eggs and intestinal infectious viruses, etc.). The organic matter present in domestic sewage is extremely unstable and easily rots to produce stench. Bacteria and pathogens reproduce in large numbers using organic matter in domestic sewage as nutrients, which can lead to the spread of infectious ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/52
CPCC02F1/5236
Inventor 陈美霞
Owner 肇庆中奥检测咨询有限公司
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