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A method for rapidly achieving and stably maintaining short-cut nitrification in a continuous flow process

A short-range nitrification and rapid technology, applied in chemical instruments and methods, sustainable biological treatment, water/sludge/sewage treatment, etc., can solve the problem of high energy consumption of aeration, achieve high denitrification rate, not easy to be damaged, The effect of reducing aeration energy consumption

Active Publication Date: 2011-11-30
彭永臻
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Solve the problem of high aeration energy consumption in sewage denitrification treatment, and realize efficient treatment of urban sewage

Method used

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  • A method for rapidly achieving and stably maintaining short-cut nitrification in a continuous flow process
  • A method for rapidly achieving and stably maintaining short-cut nitrification in a continuous flow process
  • A method for rapidly achieving and stably maintaining short-cut nitrification in a continuous flow process

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Embodiment one sees figure 1 As shown, a device for quickly realizing and stably maintaining short-cut nitrification in a continuous flow process, in which the water inlet tank 1, the aeration system 2 and the sedimentation system 3 are set in sequence from the water inlet to the water outlet. The water inlet tank 1 is connected to the fully mixed reaction tank 7 through the water inlet pump 6, and the water outlet above the completely mixed reaction tank 7 is connected to the sedimentation tank 14 through a pipeline. The volume of the mixed reaction cell. The settling tank 14 is a radial-flow settling tank with central water inlet and peripheral water outlet. The water inlet pipe is at the center, and the water outlet weir is at the periphery and is connected with a system water outlet 15 . A fender 16 is set in the sedimentation tank, and the bottom of the sedimentation tank is connected to the excess sludge port 17 to remove part of the sludge, and the other part of...

Embodiment 2

[0037] Embodiment two see image 3 As shown, for the rapid start of short-term nitrification, the sewage from a septic tank in a college living area in Beijing is used as raw water, and the influent COD, ammonia nitrogen, and total nitrogen (COD=160-320mg / L, NH 4 + -N=46.8-75.6mg / L, TN=49.4-85.4mg / L), COD, NH during the test phase 4 + The average influent concentrations of -N and TN were 215mg / L, 59.7mg / L and 64.5mg / L.

[0038] By monitoring the characteristic points on the pH and DO curves of the aerobic phase every cycle, and using aerobic aeration to control and stop the aeration in real time, obvious NO gradually appeared in the reaction tank at the end of each cycle 2 - -N accumulation. During the batch culture, it took only 24 days, the NO in the reaction pool 2 - -N accumulation rate (NAR) increased from 51.7% at the beginning to 95.2%.

Embodiment 3

[0039] Embodiment three see Figure 4 As shown, the stable maintenance of short-cut nitrification in continuous flow, using the septic tank sewage of a college living area in Beijing as raw water, influent COD, ammonia nitrogen, total nitrogen (COD=160-320mg / L, NH 4 + -N=46.8-75.6 mg / L, TN=49.4-85.4 mg / L). Using the device mentioned in the present invention, the hydraulic retention time (HRT) of the fully mixed reaction tank is set to 4h, and the sludge return ratio is 100%. The stable maintenance of short-cut nitrification of this process was tested using dissolved oxygen (DO) as the control parameter of the fully mixed reaction tank.

[0040] COD, NH in the test stage 4 + The average influent concentrations of -N and TN were 215mg / L, 59.7mg / L and 64.5mg / L. During the test, the concentration of DO was monitored online, and according to the NH concentration in the effluent 4 + -N and NO 2 - -N concentration adjusts the aeration rate. When the DO is controlled at abou...

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Abstract

A device for realizing and maintaining shortcut nitrification in a continuous flow process is successively provided with a water inlet tank, an aeration system and a precipitation system, wherein the water inlet tank is communicated with a completely hybrid reaction tank through an intake pump and the completely hybrid reaction tank is communicated with a precipitation tank through a pipeline. The reaction tank is provided with a DO probe and a pH probe. Data is transmitted to a PLC control system through a DO\pH online detecting instrument and the PLC control system is connected with an air compressor. In an intermittent starting stage, the PLC control system can timely close a switch of the air compressor according to variation characteristics of DO and pH values. In a stable maintenance stage, the PLC control system can adjust an opening or a rotational speed of the air compressor in real time and control a DO concentration in the reaction tank within an optimized scope. This invention realizes rapid starting and stable maintenance of the shortcut nitrification and resolves a problem that starting of the shortcut nitrification in the continuous flow process is difficult in treating municipal sewage and the shortcut nitrification is difficult to be re-implemented. The invention is mainly used to realize the shortcut nitrification of the municipal sewage or wastewater containing high ammonia nitrogen in the continuous flow process, and saves the aeration energy consumption.

Description

technical field [0001] The invention relates to a method for biological denitrification of sewage by activated sludge method, in particular to a method for quickly starting and stably maintaining short-range nitrification in a continuous flow sewage treatment process by using process control. Background technique [0002] my country's sewage treatment plants mostly use continuous flow process to treat urban sewage or organic industrial wastewater. The energy consumption of aeration in urban sewage plants accounts for about 50% of all operating costs of sewage plants. The operating costs of sewage treatment are huge and long-term. [0003] The traditional nitrification and denitrification denitrification process is mainly divided into two steps, that is, converting ammonia nitrogen into nitrate nitrogen through nitrification, and then converting nitrate nitrogen into nitrogen gas through denitrification to escape from the water. In the nitrification stage, ammonia nitrogen (N...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F3/12C02F3/34
CPCY02W10/10
Inventor 彭永臻郭建华王中玮王淑莹黄惠珺
Owner 彭永臻
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