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Coking wastewater purifying agent as well as preparation method and application thereof

A technology for coking wastewater and purifying agent, which is applied in chemical instruments and methods, natural water treatment, water/sludge/sewage treatment, etc. The problem of high concentration can achieve the effect of good synergy, fast sedimentation and simple preparation process.

Active Publication Date: 2015-04-22
内蒙古美方煤焦化有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, domestic coking wastewater adopts biological method as the main treatment process, but due to its high concentration of organic matter, difficult biodegradation, high biological toxicity, many types of substances, high concentration of ammonia nitrogen, etc., it is difficult to discharge wastewater treated solely by biological methods. standard requirements
[0003] The coagulation and sedimentation method is an economical and simple sewage treatment method commonly used at home and abroad to improve the efficiency of sewage treatment. The coagulants currently on the market are mainly aluminum-based and iron-based flocculants. For high coking wastewater, the use of a single coagulant often cannot obtain satisfactory treatment results. Therefore, it is of great significance to research and develop new compound coagulants and their use methods for the physical and chemical treatment of coking wastewater.

Method used

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  • Coking wastewater purifying agent as well as preparation method and application thereof
  • Coking wastewater purifying agent as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] Weigh 25kg of ferric sulfate, 20kg of aluminum sulfate, 15kg of magnesium chloride and 10kg of zinc sulfate, mix well and dry at 100°C for 90 minutes to make a coagulant; weigh 5kg of PAM and 8kg of bentonite, mix well and dry at 80°C , dried for 45 minutes to make a coagulant; weigh 11kg of zeolite powder and 6kg of chitosan, mix thoroughly and dry at 60°C for 60 minutes to make a accelerator.

Embodiment 2

[0046] Weigh 28kg of ferric chloride, 15kg of aluminum sulfate, 16kg of magnesium sulfate, and 12kg of zinc chloride, mix thoroughly and dry at 90°C for 120 minutes to make a coagulant; weigh 5kg of PAM, 7kg of bentonite, mix fully Dry at 100°C for 30 minutes to make a coagulant; weigh 12kg of zeolite powder and 5kg of chitosan, mix well, and dry at 50°C for 45 minutes to make an accelerator.

Embodiment 3

[0048] Take two parts of low-concentration coking wastewater 5000mL and place them in two 5000mL beakers respectively, add the purification agent prepared in Example 1 and Example 2 of the present invention respectively, first add 0.6g of coagulant, stir for 10 minutes, and then add coagulant 0.3g, stirred for 3 minutes, then added 0.1g of accelerator, stirred for 2 minutes, left to settle for 20 minutes, then took the supernatant for measurement; the results are as follows:

[0049]

[0050] The result shows: respectively add the cleaning agent prepared by embodiment 1 of the present invention and embodiment 2 to treat low-concentration coking wastewater, its COD removal rate is respectively 56.2% and 53.3%, ammonia nitrogen removal rate is respectively 65.7% and 54.3%, cyanide removal rate Both are 100%. The indicators of various pollutants are significantly reduced, and it can be used as an advanced treatment method for coking wastewater.

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Abstract

The invention discloses a coking wastewater purifying agent as well as a preparation method and an application thereof and belongs to the technical field of environmental protection. The purifying agent consists of a coagulant, a coagulant aid and an accelerant, wherein the coagulant consists of an iron salt, an aluminum salt, a magnesium salt and a zinc salt; the coagulant aid consists of PAM (polyacrylamide) and bentonite; and the accelerant consists of zeolite powder and chitosan. The purifying agent is powdery, is convenient to use, and is simple in preparation process and low in cost. The purifying agent is applied to treatment of coking wastewater to effectively reduce COD (chemical oxygen demand) and the concentrations of ammonia nitrogen, chroma, volatile phenol and cyanide in the coking wastewater, and the quality of produced water is stable.

Description

technical field [0001] The invention belongs to the technical field of environmental protection and relates to the preparation and application of a waste water purifying agent, in particular to a coking waste water purifying agent and its preparation method and application. Background technique [0002] Coking wastewater is wastewater of a large amount of aromatic compounds and heterocyclic compounds produced in the process of coal coke, gas purification and coking product recovery, which belongs to high-concentration refractory organic wastewater. At present, domestic coking wastewater adopts biological method as the main treatment process, but due to its high concentration of organic matter, difficult biodegradation, high biological toxicity, many types of substances, high concentration of ammonia nitrogen, etc., it is difficult to discharge wastewater treated solely by biological methods. standard requirements. [0003] The coagulation and sedimentation method is an econ...

Claims

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Application Information

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IPC IPC(8): C02F1/52C02F103/34
CPCC02F1/52C02F2103/365
Inventor 匡开宇
Owner 内蒙古美方煤焦化有限公司
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