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Method for quickly starting shortcut nitrification of ammonia-containing wastewater

A technology of short-range nitrification and rapid start-up, which is applied in chemical instruments and methods, biological water/sewage treatment, water/sludge/sewage treatment, etc. Stability and other issues to achieve the effect of ensuring long-term stable operation

Active Publication Date: 2010-02-03
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Since nitrous bacteria are slow-growing autotrophic bacteria, and the control factors in the operating conditions are interrelated, the currently successfully operated nitrosation reactors generally have small loads, low removal rates, and unstable operation. Insufficient start-up time, etc., cannot effectively treat wastewater with low COD and high ammonia nitrogen concentration, which greatly limits the development and application of short-cut nitrification process

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Use the nitrifying bacteria cultivated in the laboratory as the inoculum, the MLSS after inoculation is 1.0g / L, and the ammonia-containing wastewater with a self-prepared concentration of 300mg / L is used as the reactor feed water, the pH is controlled at 7.9, and the temperature is controlled at 20°C for dissolution The oxygen concentration is about 2.0 to 3.0 mg / L. Water is fed intermittently first, and ventilation is stopped after 24 hours of reaction. After natural settlement, the supernatant is discharged, leaving bacteria, and then new ammonia-containing wastewater is added to the reactor. When the removal rate of ammonia nitrogen is greater than 90%, increase the concentration of ammonia nitrogen in the influent, and the range of each increase is 100mg / L. After 8 days, the concentration of ammonia nitrogen in the influent reaches 700mg / L. At this time, it is changed to continuous operation, the hydraulic retention time is 14h, the pH value is controlled at 8.3, an...

Embodiment 2

[0026] Use the nitrifying bacteria enriched in the laboratory as the inoculum, the MLSS after inoculation is 1.0g / L, and the ammonia-containing wastewater with a self-prepared concentration of 300mg / L is used as the reactor feed water, and the pH is controlled at about 7.9; the temperature is controlled at 20 ℃, the concentration of dissolved oxygen is 4.0-5.0 mg / L; water is fed intermittently first, and when the removal rate of ammonia nitrogen is greater than 90%, ammonium salt is added to the reactor, so that the concentration of ammonia nitrogen after adding ammonium salt is increased by 100mg / L; after 6 days, the concentration of ammonia nitrogen in the influent reaches 600mg / L. At this time, it is changed to a continuous operation mode, and the hydraulic retention time is 16h; the pH value is controlled at 8.3, and the dissolved oxygen concentration is 2.5-3.5mg / L. When the removal rate of ammonia nitrogen is greater than 90%, continue to increase the concentration of amm...

Embodiment 3

[0028]Use the nitrifying bacteria enriched in the laboratory as the inoculum. After inoculation, the MLSS is 1.5g / L. Dilute the high-ammonia wastewater from a catalyst factory to 250mg / L as the reactor feed water. The pH is controlled at 7.8; the temperature is controlled at 30°C; the dissolved oxygen concentration is 6.0-7.0 mg / L. Feed water intermittently, stop ventilation after 24 hours of reaction, remove the supernatant after natural sedimentation, leave the bacteria, and then add new ammonia-containing wastewater to the reactor, and reduce the dilution of the original wastewater when the ammonia nitrogen removal rate is greater than 90% The multiples increase the concentration of ammonia nitrogen in the influent, and the range of each increase is 50mg / L; after 6 days, the concentration of ammonia nitrogen in the influent reaches 500mg / L. At this time, it is changed to a continuous operation mode, and the hydraulic retention time is 17.5h; the pH value is controlled At 8....

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Abstract

The invention relates to a method for quickly starting shortcut nitrification of ammonia-containing wastewater, which comprises the following steps: firstly, putting an inoculums into a bioreactor, adopting an intermittent operation mode, and ensuring that the inflow ammonia nitrogen initial concentration is between 200 and 300mg / L and the pH value is controlled between 7.8 and 8.5; gradually improving the inflow ammonia nitrogen concentration, and changing the intermittent operation mode to a continuous operation mode when the ammonia nitrogen concentration reaches between 400 and 700mg / L; and setting hydraulic retention time of the continuous operation mode to between 14 and 20h, controlling the pH value in a range between 8.2 and 8.5, and gradually improving the wastewater ammonia nitrogen concentration or gradually reducing the dilution multiple of the ammonia-containing wastewater with high concentration under the condition of keeping the nitrogen removal efficiency above 70 percent until the inflow ammonia nitrogen concentration reaches between 800 and 1,200mg / L. Compared with the prior art, the method has the advantages of having not rigorous starting requirement but high starting speed, treating the ammonia-containing wastewater with high concentration and the like.

Description

technical field [0001] The invention belongs to the technical field of sewage treatment, and in particular relates to a quick-start method for short-range nitrification of ammonia-containing wastewater, which can realize the short-range nitrification process of ammonia-containing wastewater discharged in oil refining and catalyst production, especially high-concentration ammonia-containing wastewater quick start. Background technique [0002] The traditional biochemical treatment of catalysts in the petrochemical industry and ammoniacal nitrogen in synthetic ammonia wastewater is limited due to the lack of carbon sources or insufficient carbon sources. The new biological denitrification process provides a feasible way for the treatment of low COD (chemical oxygen demand, an indicator of carbon source content) high ammonia nitrogen wastewater. In particular, nitrosation biological denitrification technology has attracted widespread attention due to its advantages of reducing...

Claims

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Application Information

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IPC IPC(8): C02F3/12
CPCY02W10/10
Inventor 高会杰黎元生乔凯
Owner CHINA PETROLEUM & CHEM CORP
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