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Method based on MBBR for removing ammonia nitrogen from high hardness wastewater

A high-hardness, ammonia-nitrogen technology, applied in chemical instruments and methods, biological water/sewage treatment, water/sludge/sewage treatment, etc., can solve the problems of unstable treatment effect, poor resistance to high salt, and difficulty in scaling , to achieve the effect of low energy consumption, fast start-up speed and reliable operation of aeration and fluidization

Active Publication Date: 2014-11-19
QINGDAO SPRING WATER TREATMENT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In order to solve the existing problems in the existing technology for the treatment of ammonia nitrogen in high hardness wastewater, such as difficulty in starting, unstable treatment effect, poor resistance to high salt, easy scaling, etc., the present invention proposes a high hardness wastewater ammonia nitrogen based on MBBR. Removal method, the MBBR pretreatment method has the advantages of fast film formation, good fluidization performance, high treatment load, strong impact resistance, can handle low temperature and low matrix water, high salinity resistance, and is not easy to scale.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] The specific surface area of ​​the suspended filler used in the MBBR process is ≥500m 2 / m 3 , the specific gravity is 0.95, the diameter is 25cm, the thickness is 10cm, and the reactor volume is 5m 3 , add suspension filler 2.00m 3 , filling rate is 40%;

[0025] Start the inoculation, inoculate the activated sludge in the aeration tank of a sewage treatment plant, the sludge concentration after inoculation is 2.5g / L, and the ammonia nitrogen removal load of the reactor is 0.050kgN / kgMLSS / d; after inoculation, it operates in intermittent mode, and the water temperature is 15.7 ℃, by adding ammonium sulfate and sodium bicarbonate to the raw water, the concentration of ammonia nitrogen in the influent water is 109.33mg / L, the total alkalinity is 634.1mg / L (calculated as calcium carbonate), and the ratio of aeration air to water is 8.8. When the ammonia nitrogen consumption exceeds Stop the reaction at 90%, discharge all the water and sludge; add ammonium sulfate and s...

Embodiment 2

[0029] The specific surface area of ​​the suspended filler used in the MBBR process is ≥620m 2 / m 3 , with a specific gravity of 0.95, a diameter of 25cm, a thickness of 10cm, and a reactor volume of 15m 3 , add suspended filler 4.80m 3 , filling rate is 32%;

[0030] Start the inoculation, inoculate the activated sludge in the aeration tank of a sewage treatment plant, the sludge concentration after inoculation is 2.5g / L, and the ammonia nitrogen removal load of the reactor is 0.052kgN / kgMLSS / d; after inoculation, it operates in intermittent mode, and the water temperature is 20.1 ℃, by adding ammonium sulfate and sodium bicarbonate to the raw water, the concentration of ammonia nitrogen in the influent water is 152.8mg / L, the total alkalinity is 1000.2mg / L, the ratio of aeration gas to water is 11.8, and the reaction is stopped when the consumption of ammonia nitrogen exceeds 90%. Drain all the water and sludge; re-intake water and add ammonium sulfate and sodium bicarbon...

Embodiment 3

[0034] The specific surface area of ​​the suspended filler used in the MBBR process is ≥620m 2 / m 3 , with a specific gravity of 0.95, a diameter of 25cm, a thickness of 10cm, and a reactor volume of 15m 3 , add suspended filler 6.00m 3 , filling rate is 40%;

[0035] Start the inoculation, inoculate the activated sludge in the aeration tank of a sewage treatment plant, the sludge concentration after inoculation is 2.9g / L, and the ammonia nitrogen removal load of the reactor is 0.060kgN / kgMLSS / d; after inoculation, it operates in intermittent mode, and the water temperature is 23.7 ℃, by adding ammonium sulfate and sodium bicarbonate to the raw water, the concentration of ammonia nitrogen in the influent water is 161.3mg / L, the total alkalinity is 1212mg / L (calculated as calcium carbonate), and the ratio of aeration air to water is 14.1. When the ammonia nitrogen consumption exceeds 90 %, stop the reaction, discharge all the water and sludge; re-inflow and add ammonium sulf...

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Abstract

The invention discloses a method based on MBBR for removing ammonia nitrogen from high hardness wastewater, and belongs to the field of wastewater treatment. The method adopts a MBBR technology to process the high hardness wastewater, and aims to solve the problems of difficult start of biochemical technology, bad removing effect, unstable processing effect, and easy scale generation. The technical scheme comprises the following steps: inoculation start, high hardness start, and high hardness continuous flow operation; finally the ammonia nitrogen membrane surface load is more than 0.83 gN / m<2> / d, the ammonia nitrogen concentration is less than or equal to 5 mg / L, and the ammonia nitrogen discharge standard for city sewage factory is met. The MBBR technology has the advantages of small area occupation, simple operation, and reliable operation; does not contain a fixed bed process, so blood worms are not easy to generate; avoids the dead area phenomenon caused by uneven water distribution; and has a higher oxygen utilization rate and lower energy consumption of aeration and fluidization, compared to those of the biological fluidized bed technology.

Description

technical field [0001] The invention belongs to the field of sewage treatment, and in particular relates to an MBBR-based method for removing ammonia nitrogen from high-hardness wastewater. 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. In industrial wastewater, chemical wastewate...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F3/08C02F3/12
CPCY02W10/10
Inventor 吴迪宋美芹王晓静刘曙于振滨
Owner QINGDAO SPRING WATER TREATMENT