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Treatment system and treatment process for deeply removing total nitrogen and organic matters in coking-wastewater biochemical yielding water

A technology for treating process and coking wastewater, applied in water/sewage multi-stage treatment, water/sludge/sewage treatment, water pollutants, etc., can solve problems such as low operating cost, difficult to meet discharge standards, poor impact resistance of advanced oxidation, etc. , to achieve the effect of reducing operating costs, ensuring up-to-standard emissions, and improving impact resistance

Inactive Publication Date: 2018-01-19
BEIJING CYCLE COLUMBUS ENVIRONMENTAL SCI & TECH
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Problems solved by technology

Among them, the pre-A / O section can use influent water to provide the required carbon source for aerobic effluent reflux denitrification without external carbon source, so that denitrification can be carried out smoothly. However, the total nitrogen removal rate is affected by the reflux ratio. Restrictions make it difficult for the total nitrogen in the effluent to reach the standard, and the total nitrogen must be further removed. Usually, denitrification is used to remove the total nitrogen, and the post-denitrification needs to introduce an external carbon source to achieve the deep removal of the total nitrogen in the wastewater. At the same time, the coking wastewater The water quality and water volume fluctuate greatly, and advanced treatment alone sets advanced oxidation with poor impact resistance, so it is difficult to ensure that the effluent is discharged up to the standard all the time, and it is difficult to meet the discharge standard in some areas with high water quality discharge standards
[0003] Therefore, it is important to develop an advanced treatment process with low operating cost and stable deep removal of total nitrogen and organic matter to improve the existing post-denitrification needs to add carbon source and the advanced oxidation advanced treatment process has poor impact resistance. significance

Method used

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  • Treatment system and treatment process for deeply removing total nitrogen and organic matters in coking-wastewater biochemical yielding water

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Embodiment 1

[0029] After biochemical coagulation in a coking plant, the effluent is 203mg / L and the total nitrogen is 36mg / L. It first enters the denitrification filter, and the nitrate nitrogen is converted into nitrogen by denitrification. The total nitrogen content of the denitrification filter effluent is 8mg / L L, the effluent enters the ozone catalytic oxidation unit to remove organic matter, the effluent COD is 106mg / L, which fails to meet the emission standard, the ozone catalytic oxidation effluent enters the activated carbon adsorption unit, and the COD of the effluent is 70-80mg / L. At L, the activated carbon is regenerated, the regeneration method is cycle regeneration, the regeneration time is 60min, the regeneration solid-to-liquid ratio is 30g / L, and the carbon source used for the denitrification filter is collected after the methanol regeneration solution is used for 3 times, and the system finally effluent COD can be reduced to 70-80mg / L, and total nitrogen can be reduced to...

Embodiment 2

[0031] After biochemical coagulation in a coking plant, the effluent is 151mg / L and the total nitrogen is 30mg / L. It first enters the denitrification filter, and the nitrate nitrogen is converted into nitrogen by denitrification. The total nitrogen content of the denitrification filter effluent is 8mg / L L, the effluent enters the Fenton oxidation unit to remove organic matter, the effluent COD is 76mg / L, the ozone catalytic oxidation effluent enters the activated carbon adsorption unit, and the adsorbed effluent COD is 40-50mg / L. When the adsorbed effluent COD exceeds 50mg / L, the activated carbon is Regeneration, the regeneration method is cycle regeneration, the regeneration time is 40min, the regeneration solid-liquid ratio is 50g / L, and the carbon source used for the denitrification filter is collected after the methanol regeneration solution is used 5 times, and the final effluent COD of the system can be reduced to 40- 50mg / L, the total nitrogen is reduced to below 10mg / L....

Embodiment 3

[0033] After biochemical coagulation in a coking plant, the effluent is 246mg / L and the total nitrogen is 41mg / L. It first enters the denitrification filter, and the nitrate nitrogen is converted into nitrogen by denitrification. The total nitrogen content of the denitrification filter effluent is 13mg / L L, the effluent enters the electrochemical unit to remove organic matter, the effluent COD is 121mg / L, the ozone catalytic oxidation effluent enters the activated carbon adsorption unit, and the adsorbed effluent COD is 70-80mg / L. When the adsorbed effluent COD exceeds 80mg / L, the activated carbon is regenerated , the regeneration method is cycle regeneration, the regeneration time is 90min, the regeneration solid-to-liquid ratio is 30g / L, and the methanol regeneration solution is used for 3 times to collect the carbon source for the denitrification filter, and the final effluent COD of the system can be reduced to 70-80mg / L, the total nitrogen is reduced to below 15mg / L.

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Abstract

The invention discloses a treatment system and a treatment process for deeply removing total nitrogen and organic matters in coking-wastewater biochemical yielding water. The system comprises a denitrification filter tank and an advanced oxidation unit, wherein the denitrification filter tank is connected with the advanced oxidation unit; the rear end of the advanced oxidation unit is provided with an activated carbon adsorption unit; the activated carbon adsorption unit is connected with the denitrification filter tank. The coking-wastewater biochemical yielding water firstly enters to the denitrification filter tank to convert nitric nitrogen into nitrogen gas, and enters to the advanced oxidation unit to degrade the organic matters after the total nitrogen is decreased; afterwards, theyielding water enters to the activated carbon adsorption unit to deeply remove the organic matters; thus, the up-to-standard discharge of wastewater is achieved; the treatment system and the treatmentprocess can be used for realizing the deep removal of the total nitrogen and the organic matters in the coking-wastewater biochemical yielding water, and can be used for effectively guaranteeing theup-to-standard discharge of the yielding water when the water quality and a water amount fluctuate; the impact resistance of the system is improved; moreover, while activated carbon adsorption and methanol solvent regeneration, part of the organic matters, which are biodegradable after advanced oxidation, and waste methanol can be used as denitrification carbon sources; a carbon source does not need to be additionally added; the repeated utilization of the waste methanol and the activated carbon adsorbed organic matters is realized, and the running cost is decreased.

Description

technical field [0001] The invention relates to the field of advanced treatment of industrial wastewater, in particular to a treatment system and process for deep removal of total nitrogen and organic matter in biochemical effluent of coking wastewater. Background technique [0002] The treatment of coking wastewater is a difficult problem in the field of industrial wastewater treatment at home and abroad. Its components are complex and the concentration of pollutants is high and difficult to degrade. At present, coking wastewater is mainly biochemical treatment process based on A / O process and advanced treatment process based on advanced oxidation. Among them, the pre-A / O section can use influent water to provide the required carbon source for aerobic effluent reflux denitrification, without the need for external carbon sources, so that denitrification can be carried out smoothly, but the total nitrogen removal rate is affected by the reflux ratio. Restrictions make it dif...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/14C02F101/16C02F101/30
Inventor 王靖宇李海波刘亚丽
Owner BEIJING CYCLE COLUMBUS ENVIRONMENTAL SCI & TECH
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