Method and device for removing coal ash, and oil, phenols and ammonia from coal chemical industry wastewater

A technology for the removal of coal chemical wastewater, applied in chemical instruments and methods, multi-stage water/sewage treatment, water/sludge/sewage treatment, etc. To improve the utilization rate, avoid the decline of the dephenolization efficiency, and reduce the dosage

Active Publication Date: 2017-01-11
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Coal chemical wastewater containing tar, coal ash, acid, ammonia and phenol is difficult to treat. The main reason is that it contains a large amount of tar and coal ash, which is easy to adhere to subsequent process equipment and internal parts, causing the equipment to fail to operate normally. lead to process paralysis
In the process of coal chemical or coking wastewater treatment, a combination of gravity degreasing, coke degreasing, ceramic membrane degreasing and other processes are generally used for degreasing. These degreasing methods cannot remove a large amount of tar and coke powder in coal chemical wastewater, resulting in The dephenol extraction tower or deamination tower is seriously blocked and cannot operate normally, which greatly increases the load of subsequent biochemical treatment facilities and increases treatment costs, making it difficult to discharge wastewater up to standard
[0005] The existing coal chemical wastewater treatment process mostly adopts filtration and other technologies to simultaneously filter out tar and solid waste in the wastewater, which is not suitable for coal chemical wastewater with high pollutant concentration and high oil content, and there is no effective recovery of coal ash

Method used

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  • Method and device for removing coal ash, and oil, phenols and ammonia from coal chemical industry wastewater
  • Method and device for removing coal ash, and oil, phenols and ammonia from coal chemical industry wastewater
  • Method and device for removing coal ash, and oil, phenols and ammonia from coal chemical industry wastewater

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0127] use figure 2 The removal device shown is used for the removal of coal ash and oleaminophenol in coal chemical wastewater. The composition of the raw coal chemical industry wastewater is shown in Table 1. The water quality of the raw material coal chemical wastewater is reddish brown, the pH value is 8.9, the water temperature is 62°C, and the BOD 5 / COD Cr The value is 0.22, and the flow rate is 102 tons / hour.

[0128] Table 1: Properties of Raw Coal Chemical Wastewater

[0129]

[0130]

[0131] The removal process of coal ash and oleaminophenol in the raw coal chemical industry wastewater is:

[0132] The coal chemical industry wastewater flows through the mixing and clarification tank and then enters the extraction reactor 1 to remove coal ash, tar, coke powder and a small amount of phenol. The ratio of the coal ash / tar extractant to the coal chemical industry wastewater is 1:5, and the reaction temperature is 50 ℃; the waste water after the extraction rea...

Embodiment 2

[0143] use figure 2 The removal device shown in Table 1 removes coal ash and oleaginous phenol in the raw material coal chemical industry waste water described in Table 1, and the removal process is:

[0144] The raw coal chemical industry wastewater flows through the mixing and clarification tank and then enters the extraction reactor 1 to remove coal ash, tar, coke powder and a small amount of phenol. The ratio of the coal ash / tar extractant to the coal chemical industry wastewater is 1:4, and the reaction temperature 40°C; the waste water after the extraction reactor 1 is deacidified by the deacidification rectification tower 2, the top temperature of the deacidification rectification tower 2 is 60°C, and the temperature of the tower bottom is 110°C; Add 50% sodium hydroxide solution to the waste water and then flow into the deamination rectification tower 4 for deammonization treatment; the waste water discharged from the deamination rectification tower 4 enters the pheno...

Embodiment 3

[0148] use figure 2 The removal device shown in Table 1 removes coal ash and oleaginous phenol in the raw material coal chemical industry waste water described in Table 1, and the removal process is:

[0149] The raw coal chemical industry wastewater flows through the mixing and clarification tank and then enters the extraction reactor 1 to remove coal ash, tar, coke powder and a small amount of phenol. The ratio of the coal ash / tar extractant to the coal chemical industry wastewater is 1:4, and the reaction temperature 30°C; the waste water after the extraction reactor 1 is deacidified by the deacidification rectification tower 2, the top temperature of the deacidification rectification tower 2 is 30°C, and the temperature of the tower bottom is 90°C; Add 30% sodium hydroxide solution to the waste water and then flow into the deamination rectification tower 4 for deammonization treatment; the waste water discharged from the deamination rectification tower 4 enters the phenol...

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Abstract

The invention provides a method for removing coal ash, and oil, phenols and ammonia from coal chemical industry wastewater and a device for removing coal ash, and oil, phenols and ammonia from coal chemical industry wastewater. The method comprises the steps: performing extracting on the coal chemical industry wastewater by using a coal ash/tar extractant so as to remove coal ash and tar and obtain coal ash and tar removed wastewater and a coal ash and tar enriched extractant; subjecting the coal ash and tar removed wastewater to deacidification treatment, and performing deamination treatment; then, performing extracting on the deaminated wastewater so as to dephenolize and deoil and obtain a phenol and oil enriched extractant and dephenolized and deoiled wastewater; and applying part of the phenol and oil enriched extractant to extracting so as to remove coal ash and tar so as to achieve reuse. According to the method, the coal ash and tar removal rate is high, towers are not blocked, phenols/ammonia/oil can be recovered step by step, the operation is stable, and the treatment cost is low, so that the method is particularly applicable to the treatment of the coal chemical industry wastewater with relatively high coal ash and tar concentration, and secondary pollution caused by the wastewater can be avoided; and the removal rate of total phenols in the wastewater is higher than 94%, the removal rate of ammonia is higher than 99%, the removal rate of oil is higher than 93%, the removal rate of coal ash is higher than 95%, and BOD<5>/COD<Cr> is increased by 30% compared with that of original coal chemical industry wastewater, so that favorable conditions are created for subsequent biochemical treatment.

Description

technical field [0001] The invention belongs to the technical field of water treatment and resource utilization, and relates to a method and device for removing coal ash and oleoaminophenol in coal chemical industry wastewater, and in particular to a process for removing coal ash and oleoaminophenol in coal chemical industry wastewater and devices. Background technique [0002] Coal chemical wastewater is industrial wastewater produced during coking, gas purification, and chemical product refining. It mainly contains volatile phenols, polycyclic aromatic hydrocarbons, and heterocyclic compounds such as oxygen, sulfur, and nitrogen. It is a kind of high COD, high phenol value, and high ammonia nitrogen. and difficult to treat industrial organic wastewater. This type of wastewater has large changes in water quality and quantity, complex components, and is difficult to biodegrade. Domestically, pretreatment to remove oil, air stripping to remove ammonia, extraction to remove p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04C02F9/10C02F9/14
Inventor 曹宏斌宁朋歌盛宇星李玉平
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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