Starting and running method for shortcut nitration technology based on MBBR

A technology of short-range nitrification and operation method, which is applied in the field of start-up and operation of short-range nitrification process based on MBBR, which can solve problems such as difficult start-up and unstable nitrite accumulation rate, and achieve high oxygen utilization rate and energy consumption of aeration and fluidization The effect of low and high processing load

Active Publication Date: 2014-04-02
QINGDAO SPRING WATER TREATMENT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] In order to solve the problems of difficulty in starting and unstable nitrite accumulation rate in the short-cut nitrification process in the prior art, the present invention proposes a short-cut nitrification process start-up and operation met

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] The specific surface area of ​​the suspended filler used in the MBBR process is ≥500m 2 / m 3 , specific gravity 0.96-0.99, diameter 25cm, thickness 10cm, reactor volume 10m 3 , add suspended filler 4.0m 3 , filling rate is 40%;

[0023] The activated sludge in the aeration tank of a sewage treatment plant was inoculated. The sludge concentration after inoculation was 2.32g / L, and the ammonia nitrogen removal load of the reactor was 0.051kgN / kgMLSS / d; The concentration of ammonia nitrogen in the water is 130-150mg / L, the pH of the influent water is 7.8-8.0, and the ratio of aeration gas to water is 6.0-6.2. When the ammonia nitrogen in the reactor is less than 10mg / L, stop the reaction, discharge all the water and sludge, and repeat Running, after 60 cycles, the surface load of ammonia nitrogen oxide film reaches 0.61gN / m 2 / d;

[0024] From the 61st cycle, the aeration air-water ratio is controlled to be 5.1-5.3, the dissolved oxygen is controlled to be 1.6-1.8mg / L...

Embodiment 2

[0027] Embodiment 2 is carried out simultaneously with Embodiment 1, the difference is that, from 61 days onwards, it is changed to continuous flow operation, the concentration of ammonia nitrogen in the influent is 940-950mg / L, the pH of the influent is 8.0-8.2, and the hydraulic retention time is 24h; Control the aeration air-water ratio to 6.6-6.7, make the filler in a fluidized state with dissolved oxygen at 2.5-3.0mg / L, stirring power at 3-4W / m 3 ; The nitrifying liquid in the sedimentation tank is refluxed, and the reflux ratio is 43%; the average concentration of suspended sludge in the reactor is 18.4mg / L; to 69 days, after the working condition is stable, the nitrite accumulation rate is 88% at this time; The water ratio is controlled at 6.3-6.6. By 74 days, the nitrite accumulation rate has recovered to 97%. At present, the reactor has been running stably for more than 400 days, and the treatment effect is good. The nitrite accumulation rate is always greater than 90%...

Embodiment 3

[0029] The specific surface area of ​​the suspended filler used in the MBBR process is ≥620m 2 / m 3, specific gravity 0.96-0.99, diameter 25cm, thickness 10cm, reactor volume 10m 3 , add suspension filler 5.0m 3 , filling rate is 50%;

[0030] The activated sludge in the aeration tank of a sewage treatment plant was inoculated. The sludge concentration after inoculation was 2.52g / L, and the ammonia nitrogen removal load of the reactor was 0.058kgN / kgMLSS / d; The concentration of ammonia nitrogen in the water is 170-190mg / L, the pH of the influent water is 7.8-8.0, and the ratio of aeration gas to water is 6.1-6.3. When the ammonia nitrogen in the reactor is less than 10mg / L, stop the reaction, discharge all the water and sludge, and repeat After 50 cycles of operation, the surface load of the ammonia nitrogen oxide film reaches 0.71gN / m 2 / d;

[0031] From the 51st cycle, the aeration air-water ratio is controlled to be 5.4-5.8, the dissolved oxygen is controlled to be 2.0...

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Abstract

The invention discloses a starting and running method for a shortcut nitration technology based on an MBBR (Moving Bed Biofilm Reactor) and belongs to the field of sewage treatment. The problems of difficult starting, unstable nitrite accumulation effect and low processing load in the original biochemical technology are solved. The method comprises the following steps: starting inoculation, starting the shortcut nitration of the MBBR and continuously running the shortcut nitration of the MBBR. Finally, the load of an ammonia nitrogen membrane side reaches more than 1.5 gN/m<2>/d, the nitrite accumulation rate stability is higher than or equal to 90%, and the requirement of follow-up denitrification or anaerobic ammonium oxidation on nitrogen is met. The method has the advantages of stable shortcut nitration effect, high ammonia nitrogen oxidation, occupied land saving, simple operation and reliable running. Compared with a traditional technology, the selection and the elimination of sludge can be realized, long-term running instability is prevented, the oxygen utilization rate is high, and aeration and fluidization energy consumption is low.

Description

technical field [0001] The invention belongs to the field of sewage treatment, and in particular relates to a method for starting and operating an MBBR-based short-range nitrification process. Background technique [0002] The situation of my country's water environment is severe, and ammonia nitrogen is one of the main pollution sources. Due to the harm of ammonia nitrogen to aquatic animals and plants, and the accumulation of inorganic nitrogen may cause water eutrophication and other problems, the country has paid more attention to the treatment of ammonia nitrogen in wastewater in recent years. The "Urban Sewage Plant Pollutant Discharge Standard" stipulates that the concentration of ammonia nitrogen in the effluent must be less than 5mg / L. Ammonia nitrogen treatment mainly relies on autotrophic flora, which has a small specific growth rate, low yield coefficient, slow microbial growth, and is greatly affected by water quality. [0003] At present, for ammonia nitrogen...

Claims

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Application Information

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IPC IPC(8): C02F3/12
CPCY02W10/10
Inventor 刘曙吴迪时丹宋美芹于振滨
Owner QINGDAO SPRING WATER TREATMENT
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