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Processing method for coal gasification wastewater

A technology of coal gasification wastewater and treatment methods, applied in the direction of oxidized water/sewage treatment, chemical instruments and methods, multi-stage water/sewage treatment, etc., can solve problems such as non-green treatment methods, frequent replacement of activated carbon, and a large number of chemical agents. Achieve short processing time, reduce COD value, ammonia nitrogen concentration and total phenol concentration, and high efficiency

Active Publication Date: 2015-05-27
CHINA NAT OFFSHORE OIL CORP +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Among them, the activated carbon adsorption method has high efficiency and is the most commonly used method for coal gasification wastewater treatment. However, activated carbon needs to be replaced frequently and consumes a lot, so the cost is also high
The Fendon method refers to the oxidation of refractory biodegradable organic matter in water by using a strong oxidant obtained by combining ferrous salt and hydrogen peroxide under acidic conditions; its disadvantage is that it needs to use a large amount of chemicals and generates a large amount of sludge , not a green approach

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  • Processing method for coal gasification wastewater

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Embodiment 1

[0031] This embodiment is used to illustrate the treatment method of coal gasification wastewater provided by the present invention.

[0032] The above-mentioned pretreated wastewater is sent to biochemical treatment equipment (purchased from Shanghai Kangzhen Environmental Technology Co., Ltd., the same below) for biochemical treatment. In this biochemical treatment equipment, anaerobic biological treatment and aerobic biological treatment are sequentially performed. Among them, The temperature of the anaerobic biological treatment is 37°C, the pH value is 8, and absolute anaerobic is maintained. The sludge concentration of the anaerobic biological treatment is 20g / L, and the hydraulic retention time of the wastewater flowing through the anaerobic biological treatment step is 24h; The temperature of the biological treatment is 37°C, the pH value is 8, the dissolved oxygen is 5mg / L, the sludge concentration of the aerobic biological treatment is 5g / L, and the hydraulic retentio...

Embodiment 2

[0036] This embodiment is used to illustrate the treatment method of coal gasification wastewater provided by the present invention.

[0037] Send the above-mentioned pretreated wastewater to biochemical treatment equipment for biochemical treatment, and the biochemical treatment equipment performs anaerobic biological treatment and aerobic biological treatment in sequence, wherein the temperature of anaerobic biological treatment is 35°C, and the pH value is 7 , to maintain absolute anaerobic, the sludge concentration of anaerobic biological treatment is 10g / L, the hydraulic retention time of wastewater flowing through the anaerobic biological treatment step is 96h; the temperature of aerobic biological treatment is 20°C, the pH value is 6, the dissolved The oxygen is 3mg / L, the sludge concentration of aerobic biological treatment is 3g / L, the hydraulic retention time of wastewater flowing through the aerobic biological treatment step is 72h, and the wastewater after aerobic b...

Embodiment 3

[0041] This embodiment is used to illustrate the treatment method of coal gasification wastewater provided by the present invention.

[0042] Send the above-mentioned pretreated wastewater into biochemical treatment equipment for biochemical treatment, in which anaerobic biological treatment and aerobic biological treatment are carried out sequentially, wherein the temperature of anaerobic biological treatment is 36°C, and the pH value is 6 , to maintain absolute anaerobic, the sludge concentration of anaerobic biological treatment is 15g / L, the hydraulic retention time of wastewater flowing through the anaerobic biological treatment step is 50h; The oxygen is 3mg / L, the sludge concentration of aerobic biological treatment is 3g / L, the hydraulic retention time of wastewater flowing through the aerobic biological treatment step is 50h, and the wastewater after aerobic biological treatment is the wastewater after biochemical treatment. Among them, the COD value of the wastewater...

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Abstract

The invention provides a processing method for coal gasification wastewater. The processing method comprises successively performing pretreatment and biochemical treatment on the to-be processed coal gasification wastewater, also the processing method comprises performing advanced treatment on the biochemical-treated coal gasification wastewater. The advanced treatment comprises contacting the biochemically-treated coal gasification wastewater with ozone, then performing further aerobic biological treatment on the contacted wastewater. Compared with 1 mg of phenolic compounds in the biologically-treated coal gasification wastewater, the using amount of the ozone is 1.5-2.5 mg; and the contacting conditions of the biologically-treated coal gasification wastewater and ozone comprise a temperature of 15-37 DEG C, pH value of 7-11 and hydraulic retention time of 10-60 min. According to the above technical scheme, the coal gasification wastewater processed by the processing method of the invention has a COD value of 46 mg / L or less, an ammonia nitrogen concentration of 3.5 mg / L or less and a total phenolics concentration of 0.15 mg / L, and reaches a GB8978-1996 sewage comprehensive discharge primary standard.

Description

technical field [0001] The invention relates to the field of water treatment, in particular to a treatment method for coal gasification wastewater. Background technique [0002] Coal gasification process is an important part of the coal chemical industry, which refers to the process of converting coal into gas, specifically refers to the process of thermochemical reaction between coal and gasification agent under high temperature conditions to obtain reaction gas. The coal gasification process will produce a large amount of coal gasification wastewater. For example, the Lurgi crushed coal pressurized gasification process is one of the most widely used coal gasification processes. Its typical process mainly includes: putting coal in the furnace of the gasifier On the grate, the gasification agent (a mixture of water vapor and oxygen) is passed through the grate from the bottom of the gasifier, and the gasification reaction occurs at a temperature of about 1000°C and a pressur...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/14C02F1/78
Inventor 张振家于广欣纪钦洪王建伟
Owner CHINA NAT OFFSHORE OIL CORP