Water purifying agent for coking wastewater treatment and preparation method thereof

Abstract

The present application belongs to the technical field of coking wastewater treatment, and particularly relates to a water purifying agent for coking wastewater treatment and a preparation method thereof. The water purifying agent for coking wastewater treatment is composed of the following raw materials in parts by weight: activated carbon 49-55 parts, polyaluminum chloride 10-15 parts, polyferric sulfate 10-15 parts, activated clay 5-15 parts, demulsifier 3-5 parts, dicyandiamide formaldehyde resin decoloring agent 0.5-1 part, and zinc chloride 0.5-1 part. The present water purifying agent has good treatment effect, can reduce the COD of coking wastewater to below 60 mg / L, can effectively reduce the cyanide content, has obvious decoloring effect, and makes the colority of the treated coking wastewater close to that of tap water.

Description

Technical Field

[0001] This invention belongs to the field of coking wastewater treatment technology, specifically relating to a water purification agent for coking wastewater treatment and its preparation method. Background Technology

[0002] Water purification agents are chemicals added to water that react with other impurities in the water, primarily for the purpose of purification. Commonly used water purification agents include polyaluminum chloride and polyaluminum ferric chloride. Current products in the industry can only reduce the COD of coking wastewater to around 80 mg / L, and the treated coking wastewater has a high cyanide content and high color, and is also costly.

[0003] Chinese patent application CN109293005A, published on February 1, 2019, discloses an environmentally friendly polyaluminum chloride water purifier, comprising, by weight: 30-42 parts polyaluminum chloride, 9-15 parts activated carbon, 13-20 parts aluminum sulfate, 6-9 parts ferric chloride, 8-11 parts ferric sulfate, 4-7 parts bentonite, 15-18 parts fruit shell filter media, 1-3 parts *Paragonimus westermani* powder, and 0.9-1.5 parts nitrifying bacteria powder. While this method reduces costs to some extent, it still suffers from problems such as high COD content and high color after purification.

[0004] In summary, existing technologies can produce composite water purification agents, but they suffer from problems such as high COD content, high cyanide content, and high cost after purification. Summary of the Invention

[0005] To address the shortcomings of existing technologies, the present invention aims to provide a water purification agent for treating coking wastewater, which can reduce the COD of coking wastewater to below 60 mg / L with good treatment effect; it can also effectively reduce cyanide content and has a significant decolorization effect, making the color of the treated coking wastewater close to that of tap water.

[0006] Another objective of this invention is to provide a method for preparing a water purification agent for coking wastewater treatment. This method has simple preparation steps, low cost, and is conducive to industrial production.

[0007] The technical solution adopted in this invention is:

[0008] The water purification agent for treating coking wastewater is made from the following raw materials in parts by weight:

[0009] 49-55 parts activated carbon

[0010] 10-15 parts of polyaluminum chloride

[0011] 10-15 parts of polyferric sulfate

[0012] 5-15 parts activated clay

[0013] 3-5 parts of demulsifier

[0014] Dicyandiamide formaldehyde resin decolorizing agent 0.5-1 part

[0015] Zinc chloride 0.5-1 part.

[0016] The demulsifier is one of the following: demulsifier flocculant MP150, demulsifier PE2511, and demulsifier PE2157, with demulsifier flocculant MP150 being preferred.

[0017] The method for preparing the water purification agent for coking wastewater treatment includes the following steps:

[0018] (1) Add the prepared activated carbon to the mixer first, then add the demulsifier and dicyandiamide formaldehyde resin decolorizing agent, and start the mixer to mix;

[0019] (2) Add activated clay, zinc chloride, polyaluminum chloride and polyferric sulfate in sequence, stir, mix and grind to obtain the final product.

[0020] The stirring time in step (1) is 10-15 minutes.

[0021] The stirring time in step (2) is 75-80 minutes.

[0022] The particle size after grinding is 200-250 mesh.

[0023] This preparation method combines activated carbon and activated clay to fully utilize their physical adsorption properties. Activated carbon adsorbs most impurities in coking wastewater, while activated clay effectively adsorbs trace amounts of oily substances and cyanide, exhibiting a stronger adsorption effect than activated carbon alone. Polyaluminum chloride and polyferric sulfate act as flocculation agents. The demulsifier, as a surfactant, effectively accelerates the preceding adsorption and flocculation processes. Dicyandiamide-formaldehyde resin integrates decolorization and COD removal functions. Its decolorization mechanism involves high-density cationic groups combining with anionic groups in the wastewater to form hydrophobic, insoluble salts that separate from the water, further reducing COD. Zinc chloride acts as a sludge dewatering agent, reducing sludge volume and quantity.

[0024] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0025] (1) This water purification agent has a good treatment effect, which can reduce the COD of coking wastewater to below 60mg / L and effectively reduce cyanide. The decolorization effect is obvious, making the color of the treated coking wastewater close to that of tap water.

[0026] (2) This water purification agent has low production cost and low usage.

[0027] (3) This water purifier is non-hygroscopic and easy to store;

[0028] (4) The preparation steps of this method are simple and the cost is low, which is conducive to industrial production. Detailed Implementation

[0029] The present invention will be further described below with reference to the embodiments, but these embodiments do not limit the implementation of the present invention.

[0030] Raw materials used in the examples and comparative examples:

[0031] Dicyandiamide formaldehyde resin decolorizing agent Yixing Qingtai Purification Agent Co., Ltd.

[0032] MP150 demulsifier, Weihai Xiangyu Environmental Protection Technology Co., Ltd.

[0033] Demulsifier PE2511, Weihai Xiangyu Environmental Protection Technology Co., Ltd.

[0034] Demulsifier PE2157, Weihai Xiangyu Environmental Protection Technology Co., Ltd.

[0035] Test method:

[0036] COD content: determined according to HJ828-2017 "Determination of Chemical Oxygen Demand in Water - Dichromate Method";

[0037] Color: Tested according to GB11903-89 "Determination of Color in Water";

[0038] Cyanide content: determined according to HJ484—2009 "Determination of Cyanide in Water by Volumetric and Spectrophotometric Methods".

[0039] Example 1

[0040] The water purification agent for treating coking wastewater contains the following raw materials:

[0041] Activated carbon: 55g; polyaluminum chloride: 15g; polyferric sulfate: 15g; activated clay: 15g; demulsifying flocculant MP150: 5g; dicyandiamide formaldehyde resin decolorizing agent: 0.5g; zinc chloride: 0.5g.

[0042] Its preparation method includes the following steps:

[0043] (1) Add the prepared activated carbon to the mixer first, then add the demulsifying flocculant MP150 and dicyandiamide formaldehyde resin decolorizing agent, and start the mixer to mix for 15 minutes;

[0044] (2) Add activated clay, zinc chloride, polyaluminum chloride and polyferric sulfate in sequence, stir and mix for 80 minutes, grind after mixing until the particle size is 250 mesh, and then obtain the product.

[0045] Example 2

[0046] The water purification agent for treating coking wastewater contains the following raw materials:

[0047] Activated carbon: 49g; polyaluminum chloride: 15g; polyferric sulfate: 10g; activated clay: 10g; demulsifying flocculant MP150: 5g; dicyandiamide formaldehyde resin decolorizing agent: 0.5g; zinc chloride: 0.5g.

[0048] Its preparation method includes the following steps:

[0049] (1) Add the prepared activated carbon to the mixer first, then add the demulsifying flocculant MP150 and dicyandiamide formaldehyde resin decolorizing agent, and start the mixer to mix for 10 minutes;

[0050] (2) Add activated clay, zinc chloride, polyaluminum chloride and polyferric sulfate in sequence, stir and mix for 75 minutes, grind after mixing until the particle size is 250 mesh, and then obtain the product.

[0051] Example 3

[0052] The water purification agent for treating coking wastewater contains the following raw materials:

[0053] Activated carbon: 53g; polyaluminum chloride: 15g; polyferric sulfate: 15g; activated clay: 15g; demulsifying flocculant MP150: 5g; dicyandiamide formaldehyde resin decolorizing agent: 0.8g; zinc chloride: 0.5g.

[0054] Its preparation method includes the following steps:

[0055] (1) Add the prepared activated carbon to the mixer first, then add the demulsifying flocculant MP150 and dicyandiamide formaldehyde resin decolorizing agent, and start the mixer to mix for 15 minutes;

[0056] (2) Add activated clay, zinc chloride, polyaluminum chloride and polyferric sulfate in sequence, stir and mix for 80 minutes, grind after mixing until the particle size is 230 mesh, and then obtain the product.

[0057] Example 4

[0058] The water purification agent for treating coking wastewater contains the following raw materials:

[0059] Activated carbon: 51g; polyaluminum chloride: 15g; polyferric sulfate: 15g; activated clay: 15g; demulsifying flocculant MP150: 5g; dicyandiamide formaldehyde resin decolorizing agent: 0.8g; zinc chloride: 0.8g.

[0060] Its preparation method includes the following steps:

[0061] (1) Add the prepared activated carbon to the mixer first, then add the demulsifying flocculant MP150 and dicyandiamide formaldehyde resin decolorizing agent, and start the mixer to mix for 13 minutes.

[0062] (2) Add activated clay, zinc chloride, polyaluminum chloride and polyferric sulfate in sequence, stir and mix for 78 minutes, grind after mixing until the particle size is 230 mesh, and then obtain the product.

[0063] Example 5

[0064] The water purification agent for treating coking wastewater contains the following raw materials:

[0065] Activated carbon: 49g; polyaluminum chloride: 15g; polyferric sulfate: 15g; activated clay: 15g; demulsifying flocculant MP150: 5g; dicyandiamide formaldehyde resin decolorizing agent: 1g; zinc chloride: 0.5g.

[0066] Its preparation method includes the following steps:

[0067] (1) Add the prepared activated carbon to the mixer first, then add the demulsifying flocculant MP150 and dicyandiamide formaldehyde resin decolorizing agent, and start the mixer to mix for 15 minutes;

[0068] (2) Add activated clay, zinc chloride, polyaluminum chloride and polyferric sulfate in sequence, stir and mix for 80 minutes, grind after mixing until the particle size is 220 mesh, and then obtain the product.

[0069] Example 6

[0070] The water purification agent for treating coking wastewater contains the following raw materials:

[0071] Activated carbon: 49g; polyaluminum chloride: 15g; polyferric sulfate: 12g; activated clay: 10g; demulsifier PE2157: 5g; dicyandiamide formaldehyde resin decolorizing agent: 1g; zinc chloride: 1g.

[0072] Its preparation method includes the following steps:

[0073] (1) Add the prepared activated carbon to the mixer first, then add the demulsifier PE2157 and dicyandiamide formaldehyde resin decolorizing agent, and start the mixer to mix for 10 minutes;

[0074] (2) Add activated clay, zinc chloride, polyaluminum chloride and polyferric sulfate in sequence, stir and mix for 75 minutes, grind after mixing until the particle size is 210 mesh, and then obtain the product.

[0075] Example 7

[0076] The water purification agent for treating coking wastewater contains the following raw materials:

[0077] Activated carbon: 49g; polyaluminum chloride: 15g; polyferric sulfate: 13g; activated clay: 15g; demulsifying flocculant MP150: 3g; dicyandiamide formaldehyde resin decolorizing agent: 0.5g; zinc chloride: 0.8g.

[0078] Its preparation method includes the following steps:

[0079] (1) Add the prepared activated carbon to the mixer first, then add the demulsifying flocculant MP150 and dicyandiamide formaldehyde resin decolorizing agent, and start the mixer to mix for 15 minutes;

[0080] (2) Add activated clay, zinc chloride, polyaluminum chloride and polyferric sulfate in sequence, stir and mix for 80 minutes, grind after mixing until the particle size is 210 mesh, and then obtain the product.

[0081] Example 8

[0082] The water purification agent for treating coking wastewater contains the following raw materials:

[0083] Activated carbon: 49g; polyaluminum chloride: 15g; polyferric sulfate: 15g; activated clay: 10g; demulsifier PE2511: 5g; dicyandiamide formaldehyde resin decolorizing agent: 0.5g; zinc chloride: 0.5g.

[0084] Its preparation method includes the following steps:

[0085] (1) Add the prepared activated carbon to the mixer first, then add the demulsifier PE2511 and dicyandiamide formaldehyde resin decolorizing agent, and start the mixer to mix for 15 minutes;

[0086] (2) Add activated clay, zinc chloride, polyaluminum chloride and polyferric sulfate in sequence, stir and mix for 78 minutes, grind after mixing until the particle size is 200 mesh, and then obtain the product.

[0087] Comparative Example 1

[0088] Ingredients: Activated carbon: 60g; Polyaluminum chloride: 15g; Polyferric sulfate: 15g; Activated clay: 15g; MP150: 5g; Dicyandiamide formaldehyde resin decolorizing agent: 0.5g.

[0089] Its preparation method includes the following steps:

[0090] (1) Add the prepared activated carbon to the mixer first, then add MP150 and dicyandiamide formaldehyde resin decolorizing agent, and start the mixer to mix for 5 minutes;

[0091] (2) Add activated clay, polyaluminum chloride and polyferric sulfate in sequence, stir and mix for 60 minutes, grind after mixing until the particle size is 250 mesh, and then obtain the product.

[0092] Comparative Example 2

[0093] Ingredients: Activated carbon: 45g; Polyaluminum chloride: 15g; Polyferric sulfate: 1g; Activated clay: 10g; MP150: 5g.

[0094] Its preparation method includes the following steps:

[0095] (1) Add the prepared activated carbon to the mixer first, then add MP150, and start the mixer to mix for 15 minutes;

[0096] (2) Add activated clay, polyaluminum chloride and polyferric sulfate in sequence, stir and mix for 80 minutes to obtain the final product.

[0097] Comparative Example 3

[0098] Ingredients: Activated carbon: 45g; Polyaluminum chloride: 15g; Polyferric sulfate: 1g; Activated clay: 10g; MP150: 5g.

[0099] Its preparation method includes the following steps:

[0100] (1) Add the prepared activated carbon to the mixer and start the mixer to mix for 15 minutes;

[0101] (2) Add activated clay, polyaluminum chloride and polyferric sulfate in sequence, stir and mix for 100 minutes to obtain the final product.

[0102] The test results for each embodiment and comparative example are shown in Table 1.

[0103] Table 1 Test results for each embodiment and comparative example

[0104]

[0105] The test results show that, with activated carbon in the range of 49-55 parts and activated clay in the range of 5-15 parts, the interaction between the demulsifier and the dicyandiamide-formaldehyde resin decolorizing agent can significantly reduce the COD, color and cyanide concentration of the effluent, resulting in good treatment effect on coking wastewater.

Claims

1. A water purification agent for treating coking wastewater, characterized in that, It consists of the following parts by weight of raw materials: 49-55 parts activated carbon 10-15 parts of polyaluminum chloride 10-15 parts of polyferric sulfate 5-15 parts activated clay 3-5 parts of demulsifier Dicyandiamide formaldehyde resin decolorizing agent 0.5-1 part Zinc chloride 0.5-1 part; The demulsifier is one of the following: demulsifier flocculant MP150, demulsifier PE2511, and demulsifier PE2157; The method for preparing the water purification agent for coking wastewater treatment includes the following steps: (1) Add activated carbon to a mixer, then add demulsifier and dicyandiamide formaldehyde resin decolorizing agent, and start the mixer to mix; (2) Add activated clay, zinc chloride, polyaluminum chloride and polyferric sulfate in sequence, stir, mix and grind to obtain the final product.

2. The water purification agent for coking wastewater treatment according to claim 1, characterized in that, The stirring time in step (1) is 10-15 minutes.

3. The water purification agent for treating coking wastewater according to claim 1, characterized in that, The stirring time in step (2) is 75-80 minutes.

4. The water purification agent for treating coking wastewater according to claim 1, characterized in that, The particle size after grinding is 200-250 mesh.

Images