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Biochemical treatment process for high-concentration nonbiodegradable coking wastewater

A technology for refractory biodegradation and coking wastewater, which is applied in the field of high-concentration refractory biodegradable coking wastewater treatment technology, can solve the problems of water quality that cannot meet the discharge standard and direct discharge standard, and achieves less secondary pollution, less land occupation, and biochemical efficiency. high effect

Active Publication Date: 2014-12-10
SHAANXI YANCHANG PETROLEUM GRP
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] In summary, it can be seen that the above method is mainly aimed at coking wastewater with COD≤3000mg / L, ammonia nitrogen concentration≤200mg / L water quality, and for coking wastewater with worse water quality (COD≥5000mg / L, ammonia nitrogen concentration≥1000mg / L) is rarely involved and the treated water quality often cannot meet the direct discharge standard of "Discharge Standard of Pollutants for Coking Chemical Industry" (GB16171-2012)

Method used

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  • Biochemical treatment process for high-concentration nonbiodegradable coking wastewater

Examples

Experimental program
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Effect test

Embodiment 1

[0015] Such as figure 1 As shown, the coking wastewater with a COD concentration of 6000mg / L, an ammonia nitrogen concentration of 1200mg / L, and a phenol concentration of 500mg / L after pretreatment such as oil separation, air flotation, and adjustment is sent to the upflow anaerobic sludge bed reactor (abbreviated as UASB), the water inflow is 4L / hour, the biochemical treatment is carried out at a temperature of 30°C, a dissolved oxygen of zero, and a pH of 7.0, and the hydraulic retention time is 19 hours; the upflow anaerobic sludge bed reactor The effluent flows into the anoxic carrier fluidized bed biofilm reactor (abbreviated as CBR), where the temperature is 30°C and the dissolved oxygen is less than 0.5mg / L for biochemical treatment, and the hydraulic retention time is 16 hours; the anoxic carrier flow The effluent from the fluidized bed biofilm reactor flows into the first-stage aerobic carrier fluidized bed biofilm reactor for biochemical treatment at a temperature of...

Embodiment 2

[0018] Such as figure 1 As shown, the coking wastewater with a COD concentration of 5500 mg / L, an ammonia nitrogen concentration of 1100 mg / L, and a phenol concentration of 500 mg / L after pretreatment such as oil separation, air flotation, and adjustment is sent to the upflow anaerobic sludge bed reactor In, the water inflow is 11L / hour, biochemical treatment is carried out under the conditions of temperature 35℃, dissolved oxygen zero, pH 7.5, hydraulic retention time is 19 hours; the effluent of the upflow anaerobic sludge bed reactor flows into the anoxic In the carrier fluidized bed biofilm reactor, the biochemical treatment is carried out at a temperature of 32°C and dissolved oxygen less than 0.5mg / L, and the hydraulic retention time is 15 hours; the effluent of the anoxic carrier fluidized bed biofilm reactor flows into a In the first-class aerobic carrier fluidized bed biofilm reactor, the biochemical treatment is carried out at a temperature of 32°C, a dissolved oxyge...

Embodiment 3

[0021] Such as figure 1As shown, the coking wastewater with a COD concentration of 5500 mg / L, an ammonia nitrogen concentration of 1000 mg / L, and a phenol concentration of 400 mg / L after pretreatment such as oil separation, air flotation, and adjustment is sent to the upflow anaerobic sludge bed reactor In the process, the water inflow is 4L / hour, the biochemical treatment is carried out under the conditions of temperature 40℃, dissolved oxygen zero and pH 6.5, and the hydraulic retention time is 10 hours; the effluent of the upflow anaerobic sludge bed reactor flows into the anoxic In the carrier fluidized bed biofilm reactor, the biochemical treatment is carried out at a temperature of 35°C and dissolved oxygen less than 0.5mg / L, and the hydraulic retention time is 10 hours; the effluent of the anoxic carrier fluidized bed biofilm reactor flows into a In the first-class aerobic carrier fluidized bed biofilm reactor, the biochemical treatment is carried out at a temperature o...

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Abstract

The invention discloses a biochemical treatment process for a high-concentration nonbiodegradable coking wastewater. The characteristics and the existing domestic processing situation of the high-concentration nonbiodegradable coking wastewater are combined, and a process combined with an upflow anaerobic sludge bed reactor, an anoxic carrier fluidized bed biofilm reactor and a two-stage aerobic carrier fluidized bed biofilm reactor is adopted, so that the problem that the high-concentration coking wastewater is difficult to treat is solved. The biochemical treatment process is low in operation cost and high in biological efficiency, the concentration of pollutants such as COD (chemical oxygen demand), ammonia nitrogen and phenol in the coking wastewater, of which the COD is greater than or equal to 5,000mg / L and the ammonia nitrogen concentration is greater than or equal to 1,000mg / L, can be effectively reduced, the effluent quality reaches the direct emission standard in the 'emission standard of pollutants for coking chemical industry' (GB16171-2012), secondary pollution is not easily caused, and the biochemical treatment process is suitable for popularization and application.

Description

technical field [0001] The invention belongs to the technical field of environmental protection and refractory industrial wastewater treatment, and in particular relates to a treatment process for high-concentration refractory biodegradable coking wastewater. Background technique [0002] Coking wastewater is produced in the process of high-temperature dry distillation of coal, gas purification and refining of chemical products. Its composition and properties are closely related to raw coal quality, carbonization temperature, production process and recovery methods of chemical products. The composition of coking wastewater is complex, including more than 100 kinds of dissolved organic and inorganic substances. In addition to 85% phenol, it also contains monocyclic and polycyclic aromatic compounds, heterocyclic compounds containing nitrogen, phosphorus, and sulfur, and some ammonium-containing compounds. Inorganic substances in the form of salt, the general chemical oxygen d...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F3/30
Inventor 张文存王丽莉闫旭涛刘志刚
Owner SHAANXI YANCHANG PETROLEUM GRP
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