Unlock instant, AI-driven research and patent intelligence for your innovation.

Compound color-odor removal coagulating agent, method for producing same and process thereof used for sewage treatment of leather

A leather sewage and coagulant technology, applied in biological water/sewage treatment, flocculation/sedimentation water/sewage treatment, water/sewage multi-stage treatment, etc. Low degradation rate and other problems, to achieve the effect of wide application range of PH value, comprehensive decolorization and odor, and high degradation rate

Inactive Publication Date: 2009-12-02
张小娟
View PDF0 Cites 6 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

SS, COD, chroma, total Cr, S, NH4-N, acids and alkalis and other harmful substances are seriously polluted and difficult to treat
[0007] Most of the sewage treatment processes used in the leather industry now use physical, chemical, biochemical, and biological methods, but there are certain problems: either low degradation rate, high operating costs, difficult operation, or unstable operation
However, when the sulfide and chromium in the tannery wastewater exceed a certain concentration together, they will inhibit the biochemistry; they are not suitable for the impact load, and require high power and infrastructure costs; the floor area is also large, and it is difficult for ordinary enterprises to bear; The ammonia nitrogen treatment effect is not good
[0009] 2. Biological contact oxidation method: It is a biofilm treatment method with strong impact load resistance, less sludge generation, no sludge expansion, and easy management, but it is prone to blockage and difficult to maintain
However, the sewage of this process has a long residence time, high requirements on temperature and PH value, and is not suitable for high alkalinity, and the northern region

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Compound color-odor removal coagulating agent, method for producing same and process thereof used for sewage treatment of leather
  • Compound color-odor removal coagulating agent, method for producing same and process thereof used for sewage treatment of leather
  • Compound color-odor removal coagulating agent, method for producing same and process thereof used for sewage treatment of leather

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0088] Embodiment 1 (best embodiment)

[0089] Composite decolorizing taste coagulant, comprises the raw material of following percentage by weight and makes magnesium sulfate:

[0090] Magnesia 40% with a content of 85%;

[0091] 30% sulfuric acid 60%;

[0092] Then the above-mentioned magnesium sulfate prepared is formulated into the product of the present invention with active calcium hydroxide in the following weight percentages:

[0093] Magnesium Sulfate 40%;

[0094] Contains 98% active calcium hydroxide 60%.

[0095] The product obtained in this embodiment has a good effect for urban sewage treatment.

Embodiment 2

[0096] Embodiment 2 (with reference to the preparation mode of embodiment 1, hereinafter the same)

[0097] 85% magnesium oxide 35%;

[0098] 30% sulfuric acid 65%;

[0099] Magnesium Sulfate 35%;

[0100] Contains 98% active calcium hydroxide 65%.

Embodiment 3

[0102] 85% magnesium oxide 30%;

[0103] 30% sulfuric acid 70%;

[0104] Magnesium Sulfate 30%;

[0105] Contains 98% active calcium hydroxide 70%.

[0106] In the production method of the above-mentioned composite decolorizing coagulant, according to the weight percentage of the raw materials, the concentration of the waste sulfuric acid produced by the sulfuric acid method to produce titanium dioxide by-products is adjusted to 25-30% and put into the reaction pool, and the magnesium oxide with a content of 85% is mixed according to the proportioning ratio. Add to the reaction tank; the reaction releases heat, and the reaction time is 1 to 3 hours, preferably 2 hours; after filtration, the liquid is lifted to the concentration tank with an acid-resistant pump, heated to 250°C to 300°C, preferably 280°C, and concentrated for 1 to 3 hours. Preferably 2 hours; when it comes to the crystallization pool, the crystallization time at room temperature is 3 to 5 hours, preferably 4 ...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention provides a compound color-odor removal coagulating agent, a method for producing the same and a process thereof used for sewage treatment of leather. The compound color-odor removal coagulating agent comprises magnesium-iron sulfate which is prepared by the following raw materials by weight: 25 to 40 percent of magnesia with the content of 85 percent, 50 to 70 percent of 25 to 30 percent sulfuric acid, and 5 to 12 percent of ferrous sulfate; and the magnesium-iron sulfate is mixed with active calcium hydroxide to prepare the compound color-odor removal coagulating agent according to the following weight percentage: 30 to 45 percent of magnesium-iron sulfate and 55 to 70 percent of active calcium hydroxide with the content of 98 percent. The compound color-odor removal coagulating agent has the advantages of highly efficient coagulation, wide application range of pH value, high degradation rate, complete color-odor removal, low price and the like. When the compound color-odor removal coagulating agent is used for the sewage treatment of leather, by coagulation and flocculation, various harmful components are reduced below the level three of the national GB 8978-1996 in a sedimentation tank, so that the following stable operation is ensured. The discharged water is ensured to meet the standard and recycled. The sewage staying time in the process is reduced by two thirds than that of the biochemical method and the physical-chemical method. Moreover, the method also has the advantages of saving cost and reducing investment.

Description

technical field [0001] The invention relates to a coagulation and flocculant used in the field of water and sewage treatment and a production method thereof, as well as a process for leather sewage treatment, in particular to a composite decolorization odor coagulant and a production method thereof, and a composite decolorization odor Coagulants are used in the process of leather sewage treatment. Background technique [0002] In energy saving and emission reduction, urban leather, printing and dyeing, papermaking, electroplating, coal coke chemical, petrochemical, food and pharmaceutical industries must carry out water treatment in order to adapt to environmental governance and discharge standards. [0003] At present, environmental pollution mainly includes air pollution and water pollution. Most polluting enterprises have realized the seriousness of pollution. The country is stepping up efforts to control the discharge of a large amount of organic and heavy metal harmfu...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/52C02F9/14C02F3/12C02F103/24
CPCY02W10/10
Inventor 张新长张小娟
Owner 张小娟