Treatment method of phenol-containing wastewater in coal chemical industry

A treatment method and technology for phenolic wastewater, applied in water/sewage treatment, chemical instruments and methods, biological water/sewage treatment, etc., can solve problems such as shortage, and achieve improved biodegradability, reduced biological toxicity, and stable and reliable operation Effect

Pending Publication Date: 2021-12-21
TIANJIN ZHENGDA SCI &TECH CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Phenol-containing wastewater is listed as one of the key wastewater solutions in my country's water pollution control. The existing treatment methods for phenol-containing wastewater include polycondensation, steam stripping, extraction, liquid membrane separation, chemical oxidation, and catalytic oxidation. , complex extraction method, photocatalytic method, biochemical method, etc., but for the treatment of phenolic wastewater in the coal chemical industry, there is still a lack of simple and low-cost methods

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  • Treatment method of phenol-containing wastewater in coal chemical industry

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Embodiment 1

[0023] see figure 1 , the present invention provides the following technical solutions: a process for the treatment of phenol-containing wastewater of a coal chemical enterprise, wherein phenol refers to industrial phenol, comprising the following steps:

[0024] S1. Pretreatment: Initiate reaction, polycondensation reaction, strengthening reaction and precipitation separation of wastewater in sequence;

[0025] S1.1. Initiation reaction: Add initiator oxalic acid to high-concentration phenol-containing wastewater to initiate phenolic polycondensation reaction. The ratio of the dosage of initiator oxalic acid to the influent water is 10%, so that the pH value is 2, while maintaining the operation The temperature is 25°C, and the residence time is 0.6h;

[0026] S1.2. Polycondensation reaction: Add formaldehyde solution and hypochlorous acid catalyst, wherein the mass ratio of hypochlorous acid catalyst to formaldehyde solution is 0.05%, the residence time of the enhanced reac...

Embodiment 2

[0033] see figure 1 , the present invention provides the following technical solutions: a process for the treatment of phenol-containing wastewater of a coal chemical enterprise, wherein phenol refers to phenol, cresol and xylenol, comprising the following steps:

[0034] S1. Pretreatment: Initiate reaction, polycondensation reaction, strengthening reaction and precipitation separation of wastewater in sequence;

[0035] S1.1. Initiation reaction: add initiator citric acid to high-concentration phenol-containing wastewater to initiate phenolic polycondensation reaction, wherein the dosage of initiator citric acid is 9% to the mass ratio of influent, so that the pH value is 4, and at the same time Maintain the operating temperature at 40°C with a residence time of 0.8h;

[0036] S1.2. Polycondensation reaction: Add formaldehyde solution and aluminum trichloride catalyst, wherein the mass ratio of aluminum trichloride catalyst to formaldehyde solution is 0.06%, the residence ti...

Embodiment 3

[0043] see figure 1 , the present invention provides the following technical solutions: a process for the treatment of phenol-containing wastewater of a coal chemical enterprise, wherein phenol refers to alkylphenol and aralkylphenol, comprising the following steps:

[0044] S1. Pretreatment: Initiate reaction, polycondensation reaction, strengthening reaction and precipitation separation of wastewater in sequence;

[0045] S1.1. Initiation reaction: add initiator sulfuric acid to high-concentration phenol-containing wastewater, wherein the dosage of initiator sulfuric acid is 8% of the mass ratio of influent, trigger phenolic polycondensation reaction, make the pH value 5, and maintain the operation at the same time The temperature is 50°C, and the residence time is 0.9h;

[0046] S1.2. Polycondensation reaction: Add formaldehyde solution and hydrochloric acid catalyst, wherein the mass ratio of hydrochloric acid catalyst to formaldehyde solution is 0.02%, the residence time...

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Abstract

The invention relates to a treatment method of phenol-containing wastewater in the field of coal chemical industry. The method comprises the following steps: performing pretreatment, namely sequentially performing initiation reaction, polycondensation reaction, enhanced reaction and precipitation separation on the wastewater. Specifically, initiation reaction comprises adding an initiator into the high-concentration phenol-containing wastewater to enable the pH value to be 2-5, and maintaining the operation temperature to be 25-50 DEG C and the retention time to be 0.6-0.9 h; polycondensation reaction comprises adding a formaldehyde solution and an acid catalyst, adjusting the pH value of the wastewater, and carrying out substitution and phenolic aldehyde condensation polymerization; and enhanced reaction comprises adding an auxiliary agent into the wastewater subjected to the condensation polymerization reaction to perform the enhancing reaction. Oil removal, biochemical treatment, concentration treatment and the like are then carried out sequentially. According to the method, the wastewater containing phenol and chlorophenol can be effectively treated, the wastewater reaches the standard and is discharged, the recycling rate of the coal chemical industry wastewater can be increased, the water pressure of the coal chemical industry is relieved, the process is simple, the cost is low, and operation is stable, reliable and safe.

Description

technical field [0001] The invention belongs to the technical field of coal chemical wastewater treatment, and in particular relates to a treatment process for coal chemical wastewater containing phenol. Background technique [0002] With the rapid development of the energy industry in recent years, coal chemical industry wastewater has become one of the important sources of pollution. The coal chemical industry is both a large water user and a large sewage discharge user. The waste water produced per unit of product is more than 1t / t, and the methanol plant with an annual output of 200,000 tons discharges hundreds of tons of waste water per hour; moreover, the waste water contains refractory tar, phenol and other substances , the composition is complex. It is difficult to treat by general biochemical process, and it is very difficult to control the pollution of wastewater in the coal chemical industry. However, with the sustainable development of the economy and society a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/14C02F101/34C02F101/36
CPCC02F9/00C02F1/00C02F1/52C02F1/40C02F3/00C02F1/441C02F1/444C02F1/42C02F2101/36C02F2101/345
Inventor 高溪周衡
Owner TIANJIN ZHENGDA SCI &TECH CO LTD
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