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Efficient composite coagulant for coking wastewater treatment as well as preparation method and application thereof

A technology of coking wastewater and coagulant, which is applied in chemical instruments and methods, water/sludge/sewage treatment, flocculation/sedimentation water/sewage treatment, etc. It can solve the obstinacy that affects the ammonia nitrogen and total nitrogen in the effluent and cannot be degraded. Organic matter and clear water cannot meet the normal discharge standards, etc., to achieve the effect of flexible use

Pending Publication Date: 2022-04-12
江苏同瑞环保有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] (1) Coking wastewater contains polycyclic and heterocyclic organic compounds. Traditional biochemical processes cannot degrade such recalcitrant organic compounds with complex structures. The current domestic coking wastewater AO process secondary sedimentation effluent COD is about 200-350mg / L (no blending at the front end clean wastewater)
[0004] (2) Wastewater contains cyanide and thiocyanide, especially thiocyanide, which is particularly high in content. These substances are all azide compounds, which affect the ammonia nitrogen and total nitrogen in the effluent to meet the standards
[0005] (3) Contains fluoride, which cannot be effectively removed, and the clean water that affects the treatment cannot meet the normal discharge standard

Method used

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  • Efficient composite coagulant for coking wastewater treatment as well as preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0026] Example 1, 70g of powdered activated carbon, 20g of polyaluminum iron silicate, 5g of ash and 5g of polyaluminum chloride were weighed and stirred uniformly to make a coagulant.

Embodiment 2

[0027] Example 2: Weigh 60g of powdered activated carbon, 10g of polyaluminum ferric silicate, 2g of ash, 20g of aluminum trichloride and 8g of ferric trichloride and mix and stir evenly to make a coagulant.

Embodiment 3

[0028] Example 3: 60g of powdered activated carbon, 10g of polyaluminum iron silicate, 2g of ash, 20g of anhydrous copper sulfate and 8g of ferrous sulfate were weighed and stirred uniformly to make a coagulant.

[0029] Weigh respectively the medicament A of Example 1, the medicament B of Example 2, and the medicament C of Example 3 to carry out the coagulation test. First, select the coking wastewater, and measure the COD content in the coking wastewater to be 225 mg / L, and the fluoride content to be 225 mg / L. The cyanide content was 40mg / L, and the cyanide content was 5mg / L; the coking wastewater of the same 1L was measured in 12 groups, and each of the 12 groups of 1L coking wastewater was set as an experimental group, and each group was injected into the wastewater of each experimental group. Add 300mg, 400mg, 500mg and 600mg of medicine A, medicine B and medicine C, stir each group of sewage for 8 minutes, wait for medicine A, medicine B and medicine C to fully disperse a...

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Abstract

The invention provides an efficient composite coagulant for coking wastewater treatment. The efficient composite coagulant comprises the following components in percentage by mass: 60-70% of powdered activated carbon, 10-20% of polysilicate aluminum ferric, 2-5% of ash and 4-28% of a functional component agent, the functional component agents comprise a flocculation component agent, a fluorine removal component agent or a cyanide breaking component agent, and all the functional component agents are separately matched to form three composite coagulants with different functions. In actual use, the coagulant is selected according to the types of pollutants contained in the coking wastewater, a composite coagulant containing a flocculation component agent, namely a medicament A, is used for only removing COD (Chemical Oxygen Demand), and a composite coagulant containing a fluorine removal component agent, namely a medicament B, is used for removing fluoride. A composite coagulant containing a cyanide breaking component agent, namely an agent C, is used for removing cyanide, and COD, fluoride and cyanide in the sewage can be effectively removed through the composite coagulant, so that the normal discharge standard is met.

Description

technical field [0001] The invention relates to the field of coagulants, in particular to a high-efficiency composite coagulant for coking wastewater treatment and its preparation method and application. Background technique [0002] Coagulants are needed in the wastewater treatment process to flocculate and precipitate the wastewater to purify the wastewater. The coking wastewater is produced in the process of coking, gas dry distillation, purification and recovery of chemical products in the coking plant, which contains high phenol, high ammonia nitrogen, and high concentration of organic matter. Wastewater has the characteristics of poor biodegradability, high toxicity, and strong inhibitory effect on microbial activity. In the existing coking wastewater treatment process, it is often necessary to use the secondary settling tank to put coagulant into the coking wastewater for sedimentation treatment. The following problems often occur when the existing coagulant is used: ...

Claims

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Application Information

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IPC IPC(8): C02F1/52C02F101/14C02F101/18
Inventor 蔡思泉
Owner 江苏同瑞环保有限公司
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