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Coking wastewater treatment process

A technology of coking wastewater and treatment process, which is applied in degassed water/sewage treatment, extracted water/sewage treatment, water/sewage multi-stage treatment, etc. It can solve the problems of many types of toxic organic substances, high concentration of ammonia nitrogen, and large fluctuations in water quality.

Inactive Publication Date: 2010-11-10
WUHAN IRON & STEEL (GROUP) CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the operating cost of biochemical treatment is relatively low, due to the characteristics of coking wastewater with many types of refractory toxic organic substances, large content, high ammonia nitrogen concentration, and large water quality fluctuations, it is difficult for most coking wastewater effluent COD and ammonia nitrogen concentrations to meet the "Iron and Steel Industry Water Pollutant Discharge Standards" (GB13456-92) stipulates the first-level discharge standards, especially the COD content and ammonia nitrogen concentration in the wastewater before biochemical treatment are too high, and it also has a strong inhibitory effect on microorganisms in the biochemical treatment process

Method used

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Embodiment 1

[0013] The remaining ammonia water is pumped to the extraction tower through the remaining ammonia water tank, the flow rate is 220t / h, the COD content is 7200mg / l, the ammonia nitrogen is 1600mg / l, the phenol is 1500mg / l, the cyanide is 50mg / l, and the temperature is 70°C. The ammonia water enters from the upper part of the extraction tower, and the solvent light benzene enters from the lower part of the extraction tower to contact with the ammonia water reversely. The tar and phenol in the ammonia water are partially extracted. After coming out of the extraction tower, the COD content is 6500mg / l, and the ammonia nitrogen is 1600mg / l Phenol is 480 mg / l and cyanide is 45 mg / l.

[0014] After the ammonia water is extracted, it flows into the middle tank of ammonia water, and is pumped to the ammonia water / exhaust gas heat exchanger. After the temperature of the wastewater is preheated to 90°C, it enters the ammonia distillation tower for ammonia distillation. The internal press...

Embodiment 2

[0017] The remaining ammonia water is pumped to the extraction tower through the remaining ammonia water tank. The flow rate is 270t / h, the COD content is 7000mg / l, the ammonia nitrogen is 1500mg / l, the phenol is 1700mg / l, and the cyanide is 50mg / l. After reverse contact with benzene, the COD content is 6300mg / l, the ammonia nitrogen is 1500mg / l, the phenol is 490mg / l, the cyanide is 38mg / l, the temperature is 70°C, and the temperature rises to 89°C after passing through the ammonia water / exhaust gas heat exchanger. Enter the ammonia distillation tower to distill ammonia, the pressure inside the tower is 26kPa, the fixed ammonia in the water is converted into free ammonia under the action of NaOH, and is evaporated together with the free ammonia in the ammonia water, and the wastewater flow rate after ammonia distillation is 275t / h. , the COD3500 content is mg / l, the ammonia nitrogen content is 240mg / l, the phenol is 430mg / l, the cyanide is 28mg / l, and the temperature after hea...

Embodiment 3

[0020]The remaining ammonia water is pumped to the extraction tower through the remaining ammonia water tank, the flow rate is 300t / h, the COD content is 7200mg / l, the ammonia nitrogen is 1700mg / l, the phenol is 1500mg / l, the cyanide is 45mg / l, and the temperature is 70°C. After the extraction tower is in reverse contact with light benzene, the COD content is 6800mg / l, the ammonia nitrogen is 1680mg / l, the phenol is 500mg / l, and the cyanide is 45mg / l. Ammonia distillation in the ammonia tower, the pressure inside the tower is 28kPa, the fixed ammonia in the water is converted into free ammonia under the action of NaOH and is evaporated together with the free ammonia in the ammonia water, the wastewater flow rate after ammonia distillation is 305t / h, COD The content is 3500mg / l, the ammonia nitrogen is 270mg / l, the phenol is 480mg / l, the cyanide is 30mg / l, and the temperature is 40°C after heat exchange by the heat exchanger. The wastewater index is stable for 10 days.

[0021...

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Abstract

The invention discloses a coking wastewater treatment process, which comprises the steps of extraction separation, heating, ammonia still, oil removal, water quality and water quantity regulation, biochemical treatment, flocculating settling and the like. Wastewater after the extraction separation is sent to the ammonia still step to be treated after being heated, and the ammonia still step is carried out under the condition of negative pressure. The noxious compounds such as ammonia, phenol and the like can be perfectly escaped from the ammonia, and the biochemical treatment load can be lightened. The biochemical treatment step is realized through a preaeration tank, an anoxic tank and an aerobic tank, a regulation tank is respectively communicated with the preaeration tank and the anoxic tank through a centrifugal pump and pipelines, pipelines communicated with the preaeration tank and the anoxic tank are respectively provided with a valve, the A / O process, the O / A / O process and the simultaneous proceeding of the A / O process and the O / A / O process can be switched according to different water qualities, and the invention can adapt to the coking wastewater with large water quality fluctuation. Through the treatment by the process, the wastewater reaches the first grade discharge standard specified by Discharge Standard of Water Pollutants for Iron and Steel Industry (GB 13456-92).

Description

technical field [0001] The invention belongs to the technical field of wastewater treatment in environmental engineering technology, and in particular relates to a coking wastewater treatment process. Background technique [0002] Coking wastewater is formed during high-temperature dry distillation of coal, gas purification and refining of chemical products. It contains dozens of inorganic and organic compounds, high pollutant concentration, complex composition, and extremely difficult to treat. [0003] At present, coking wastewater is often treated in two stages. The first level of treatment includes extraction and dephenolization, ammonia steaming, oil removal, water quality and quantity adjustment, etc., and the second level adopts biochemical treatment methods, such as O (aerobic) / A (anoxic) / O (aerobic) or A (anoxic) Oxygen) / O (aerobic) process, etc. Although the operating cost of biochemical treatment is relatively low, due to the characteristics of coking wastewater...

Claims

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Application Information

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IPC IPC(8): C02F9/14C02F1/26C02F1/20C02F1/52C02F3/30
Inventor 魏松波盛军波常红兵段爱民王丽娜刘刚段晓雨刘向勇
Owner WUHAN IRON & STEEL (GROUP) CORP
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