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Efficient biological denitrification process for coking wastewater

A technology for biological denitrification and coking wastewater, which is applied in water pollutants, biological treatment devices, biological water/sewage treatment, etc. To achieve the effect of saving carbon source and aeration energy consumption, good degree of automation, and improving the biochemical properties of wastewater

Active Publication Date: 2021-06-25
河北协同水处理技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The first is the limitation of carbon sources. The C / N ratio of coking wastewater is high, even reaching more than 10, but the refractory organic matter is also high. The lack of actually available carbon sources directly leads to poor denitrification efficiency. Nitrogen operation costs are high; secondly, the total nitrogen concentration is high and the composition is complex. The single-stage denitrification is limited by the return flow rate, and the efficiency of the first-stage denitrification is limited and it is difficult to meet the emission requirements. It is necessary to improve and optimize the existing denitrification process. Nitrogen increase and removal measures

Method used

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  • Efficient biological denitrification process for coking wastewater
  • Efficient biological denitrification process for coking wastewater
  • Efficient biological denitrification process for coking wastewater

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] The wastewater enters the fully mixed hydrolysis tank after degreasing pretreatment and the homogenization of the adjustment tank. The sludge concentration in the reaction tank is controlled at 5-10g / L, the DO in the wastewater is lower than 0.5mg / L, and the pH is maintained at 6-8.5 During the period, the HRT is controlled at about 10 hours, and phosphorus is added quantitatively. The mud-water mixing is controlled by mechanical stirring, and the mud-water separation is realized in the hydrolysis sedimentation tank. The sludge returns to the front-end hydrolysis tank, and the sludge return flow is determined according to the sludge concentration in the reactor. and residual sludge discharge concentration.

[0038] The supernatant Q1 of the hydrolysis sedimentation tank is set at 0.6Q to self-flow to the 1# anoxic tank, mixed with the 0.5Q return flow nitrification liquid of the 1# aerobic tank, and the secondary settling return sludge Q, and the denitrification reaction...

Embodiment 2

[0046] Example 2 and Example 1 adopt the same hydrolysis pretreatment and hydraulic distribution, the biggest difference is that the nitrification liquid backflow adopts the cross backflow method, and the total backflow is 2Q.

[0047] Ammonia distillation wastewater enters the fully mixed hydrolysis tank after degreasing pretreatment and adjusting tank homogeneity and equalization. The sludge concentration in the reaction tank is controlled at 5-10g / L, the DO in the wastewater is lower than 0.5mg / L, and the pH is maintained at 6- Between 8.5, HRT is controlled at about 10h, and phosphorus is added quantitatively. The mud-water mixing is controlled by mechanical stirring, and the mud-water separation is realized in the hydrolysis sedimentation tank. The sludge is returned to the front-end hydrolysis tank, and the sludge is determined according to the sludge concentration in the reactor. Return flow rate and residual sludge discharge concentration.

[0048] The supernatant Q1 o...

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Abstract

The invention relates to the technical field of sewage treatment, and discloses an efficient biological denitrification process for coking wastewater, which is characterized by comprising a complete mixing hydrolysis pretreatment system, a multi-stage and multi-section enhanced AO system and a rear DNBF filter denitrification system. The efficient biological denitrification process for the coking wastewater comprises the following steps: 1) ammonia distillation wastewater firstly enters a full-mixing hydrolysis tank through a regulating tank, mud-water mixing is achieved through a built-in stirrer, mud-water separation and sludge backflow are achieved through a rear-end sedimentation tank, the high sludge amount in the hydrolysis tank is guaranteed, and hydrolysis acidification bacteria in the tank conduct ring opening and chain breaking on refractory organic matterS; 2) a multi-stage and multi-stage reinforced AO process is adopted to replace a traditional AO process, firstly, a carbon source is reasonably distributed in a two-stage and two-stage mode, and the utilization rate of a raw water carbon source is improved; and 3) a DNBF filter deep denitrification system is arranged, residual nitrate nitrogen in secondary sedimentation effluent is thoroughly removed. Compared with a common activated sludge process, the method has the advantages that the occupied area is smaller, and the load is higher.

Description

technical field [0001] The invention relates to the technical field of sewage treatment, in particular to a high-efficiency biological denitrification process for coking wastewater. Background technique [0002] Coking wastewater is a type of high-concentration refractory wastewater produced during high-temperature carbonization, gas purification, and by-product recovery and refining of coal. It enters the biochemical system after ammonia distillation, oil removal and other chemical production recovery and pretreatment units. [0003] Coking wastewater has high nitrogen concentration and complex composition. Nitrogen compounds exist in various components and forms. Inorganic nitrogen mainly includes ammonia, cyanide, rhodanide, nitrate, nitrite, and a small amount of dissolved gaseous nitrogen oxides, etc. , organic nitrogen mainly includes nitrogen-containing heterocyclic compounds, organic nitriles and amines, etc. The diversity of nitrogen-containing pollutants in coking ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/14C02F3/30C02F3/28C02F1/28C02F1/66C02F101/16C02F103/34
CPCC02F9/00C02F3/302C02F3/2826C02F1/28C02F1/66C02F2001/007C02F2101/16C02F2203/006C02F2209/08C02F2209/10C02F2209/14C02F2209/16C02F2209/005C02F2103/34C02F2209/22Y02W10/10
Inventor 剧盼盼刘洪泉刘斌陈卫江高麦霞怀俊天
Owner 河北协同水处理技术有限公司
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