Method for treating coking wastewater biologically

A technology of coking wastewater and biological method, applied in the direction of sustainable biological treatment, biological water/sewage treatment, chemical instruments and methods, etc., can solve the problem of low nitrate nitrogen concentration in denitrification rate, achieve high denitrification rate, volume Small, low-concentration effects

Inactive Publication Date: 2010-09-01
WUHAN UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0005] The present invention aims to overcome the problems existing in the existing biological treatment process, and aims to provide a method that can realize COD and NH in coking wastewater 3 -N all meet the first-level requirements of the "Comprehensive Wastewater Discharge Standard", the process of biological treatment of coking wastewater with high denitrification rate of the system and low concentration of nitrate nitrogen in the effluent

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  • Method for treating coking wastewater biologically
  • Method for treating coking wastewater biologically

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Embodiment 1

[0021] The invention relates to a biological method for treating coking wastewater. The water quality of coking wastewater after homogenization, oil separation and air flotation pretreatment is: COD, NH 3 The mass concentrations of -N, phenol and cyanide are 2500-2800 mg / L, 200-250 mg / L, 600-800 mg / L and 25-35 mg / L, respectively.

[0022] Its process is as figure 1 As shown, in terms of volume percentage, 30% to 40% of the pretreated coking wastewater is controlled by valve A and enters the aerobic decarbonization pool 1 for decarburization, and stays for 6.5 to 7.5 hours; Oxygen denitrification pool 2, at the same time, 60% to 70% of the pretreated coking wastewater enters the anoxic denitrification pool 2 through valve B, and stays for 22 to 25 hours; 3 Continuously add sodium carbonate solution to neutralize the acid produced in the nitrification process, and the residence time is 20-25 hours; then enter the secondary sedimentation tank 4 for precipitation for 2-3 hours, ...

Embodiment 2

[0026] The invention relates to a biological method for treating coking wastewater. The water quality of coking wastewater after homogenization, oil separation and air flotation pretreatment is: COD, NH 3 The mass concentrations of -N, phenol and cyanide are 2800-3200 mg / L, 250-300 mg / L, 700-900 mg / L and 25-40 mg / L, respectively.

[0027] Its process is as figure 1 As shown, in terms of volume percentage, first 40% to 50% of the pretreated coking wastewater is controlled by valve A and enters the aerobic decarbonization pool 1 for decarburization and stays for 7 to 10 hours; after decarburization, it enters anoxic Denitrification pool 2, at the same time, 50% to 60% of pretreated coking wastewater enters anoxic denitrification pool 2 through valve B, and stays for 20 to 22 hours; Continuously add sodium carbonate solution to neutralize the acid generated in the nitrification process, and the residence time is 24-27h. Then enter the secondary settling tank 4. All the other ...

Embodiment 3

[0030]The invention relates to a biological method for treating coking wastewater. The water quality of coking wastewater after homogenization, oil separation and air flotation pretreatment is: COD, NH 3 The mass concentrations of -N, phenol and cyanide are 3200-3500 mg / L, 300-350 mg / L, 800-1000 mg / L and 25-40 mg / L, respectively.

[0031] Its process is as figure 1 As shown, in terms of volume percentage, 50% to 60% of the pretreated coking wastewater is controlled by valve A and enters the aerobic decarbonization pool 1 for decarburization and stays for 9 to 12 hours; after decarburization, it enters anoxic Denitrification tank 2, at the same time, 40% to 50% of pretreated coking wastewater enters anoxic denitrification tank 2 through valve B, and stays for 18 to 20 hours; Continuously add sodium carbonate solution to neutralize the acid produced in the nitrification process, and the residence time is 25-30h. Then enter the secondary settling tank 4. All the other are wit...

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Abstract

The invention relates to a method for treating coking wastewater biologically. The technical scheme is that: the method comprises the following steps of: based on volume percent fraction, making 0 to 60 percent of pretreated coking wastewater enter an aerobic decarbonization tank (1) for decarbonization through a valve A, and staying for 6 to 12 hours; making the decarbonized coking wastewater enter an anoxic denitrification tank (2), simultaneously making 40 to 100 percent of pretreated coking wastewater enter the anoxic denitrification tank (2) through a valve B, and staying for 15 to 25 hours; making the wastewater enter an aerobic nitrification tank (3), and staying for 20 to 30 hours; and settling the wastewater in a secondary sedimentation tank (4) for 2 to 3 hours, refluxing clear water in a reflux ratio of 300 to 500 percent into the anoxic denitrification tank (2) for denitrification, refluxing sludge in a reflux ratio of 50 to 100 percent into the aerobic decarbonization tank (1) and the anoxic denitrification tank (2), and coagulating effluent of the secondary sedimentation tank (4) and then discharging the wastewater after the wastewater meets the standard. In the process, the COD and NH3-N in the wastewater all meet the first-class requirement of integrated wastewater discharge standard; the denitrification rate of the system is high; and the concentration of nitrate nitrogen in the effluent is low.

Description

technical field [0001] The invention belongs to the technical field of coking wastewater treatment, in particular to a biological method for coking wastewater treatment. Background technique [0002] Coking waste water comes from high-temperature dry distillation of raw coal in coking plants, gas purification, and refining of chemical products. The composition of wastewater is complex, containing aromatic, heterocyclic and polycyclic and other refractory organic matter and high concentration of ammonia nitrogen. [0003] Coking wastewater is mainly treated by biochemical methods, and A / O and O / A-O processes are the most common in practical applications. A / O has the effect of simultaneous decarbonization and denitrification, and its application was earlier and more common, but it is difficult for COD and ammonia nitrogen in wastewater to reach the standard at the same time (COD<100mg / L, NH 3 -N<15mg / L) discharge, especially because coking wastewater contains high conc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/14C02F3/02C02F3/28C02F1/58C02F3/34
CPCY02W10/10
Inventor 颜家保魏松波吴高明杨忠华常红兵段爱民刘尚勇周敏刘伟谢建锋
Owner WUHAN UNIV OF SCI & TECH
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