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Direct-flow biological nitrogen removal sewage treatment method

A sewage treatment method and biological denitrification technology, applied in the field of sewage treatment, can solve the problems affecting the total removal efficiency of ammonia nitrogen, etc., and achieve the effect of saving power consumption and operating costs

Active Publication Date: 2010-08-25
JIANGHUA WATER TREATMENT EQUIP PLANT JIANGSU +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The reflux rate from the aerobic pool to the anoxic pool is generally 200% to 400%, and the technical analysis is carried out according to the 200% reflux rate: if the raw water inflow is Q1000m 3 / h, the return flow of the aerobic pool is twice Q of the inflow 回 2000m 3 / h, then the actual water intake in the aerobic pool becomes Q1000m 3 / h+Q 回 2000m 3 / h=Q 总 3000m 3 / h, the final discharge of the aerobic pool should be equal to the raw water intake Q1000m 3 / h, the final discharge water of the aerobic tank is one-third of the actual water inflow of the aerobic tank, which means that one-third of the nitrate nitrogen in the discharge water of the aerobic tank has not undergone reflux denitrification and has been directly reduced. emissions, affecting the total removal efficiency of ammonia nitrogen

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0011] Embodiment 1, once-through biological denitrification sewage treatment method, NH 3 -The full flow of sewage with a N concentration of 30mg / l flows from the primary aerobic pool at the beginning to the anoxic pool in sequence, then flows into the secondary aerobic pool at the terminal and is discharged without backflow in the middle, and the dissolved oxygen concentration in the primary aerobic pool is >5mg / L, the removal rate of BOD53 The -N content is 2.5 mg / l, and the denitrification rate is 91.7%.

Embodiment 2

[0012] Embodiment 2, reference example 1, NH in the influent sewage 3 - The concentration of N is 40mg / l, the input volume of the biological mass in the anoxic pool is 50% of the effective volume of the anoxic pool, and the hydraulic retention time distribution of the primary aerobic pool, the anoxic pool, and the secondary aerobic pool The ratio is 1.5:5:3.5, NH in the effluent 3 The -N content is 2.7 mg / l, and the denitrification rate is 93.3%.

Embodiment 3

[0013] Embodiment 3, reference example 1, NH in the influent sewage 3 -N concentration is 45mg / l, the input volume of the biomass in the anoxic pool is 60% of the effective volume of the anoxic pool, and the hydraulic retention time distribution of the primary aerobic pool, the anoxic pool, and the secondary aerobic pool The ratio is 1.8:5:3.2, the first aerobic pool and the second aerobic pool also put biological mass, the volume of the biological mass in the first aerobic pool is 50% of the effective volume of the first aerobic pool, and the second The volume of biomass put into the aerobic pool is 60% of the effective volume of the secondary aerobic pool, and the NH in the effluent 3 The -N content is 2.5 mg / l, and the denitrification rate is 94.5%. .

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PUM

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Abstract

The invention relates to a direct-flow biological nitrogen removal sewage treatment method, and belongs to the field of sewage treatment. The full flow of sewage at an NH3-N concentration of less than 60mg / l flows from a first-stage aerobic pond at a beginning end to an anaerobic pond sequentially, then flows into a second-stage aerobic pond at a terminating end, and is discharged without refluxing. In the first-stage aerobic pond, the dissolved oxygen concentration is more than 5mg / l, and the BOD5 removal rate is less than 50 percent. A biological mass is put into the anaerobic pond, wherein the biological mass consists of a shell and an inner core; the shell is a ball with the porosity of 90 to 94 percent consisting of 10 to 12 pieces of arc plastic sheets; the inner core in the center of the ball is an aldehyde fiber ball; the porosity expands and increases from the inner core in the center of the ball to the outside gradually; and the volume of the put biological mass is 50 to 70 percent of the effective capacity of the anaerobic pond. By improving an A20 process flow and combining with the application of a three-phase biological mass, the method achieves the dynamic balance of overall amount of aerobic bacteria, facultative bacteria and anaerobic bacteria, shortens the time difference between the nitrification and the denitrification of ammonium nitrogen and between the anaerobic release and the aerobic release of phosphorus, stably improves the nitrogen removal efficiency to above 90 percent, and can save the energy consumption by 0.1 to 0.2kwh / m3 and the operating cost by 0.07 to 0.12 yuan / m3.

Description

technical field [0001] The invention belongs to the field of sewage treatment and relates to an improved type A 2 The wastewater treatment method of the O process, in particular, refers to a once-through biological denitrification wastewater treatment method. Background technique [0002] Traditional biological denitrification process (A 2 O process), the anoxic pool is set in front of the aerobic pool, that is: anoxic pool → aerobic pool, and then flows back from the aerobic pool to the anoxic pool, and the dissolved oxygen in the anoxic pool mainly depends on the backflow from the aerobic pool provided in the liquid. Since the ammonia nitrogen in sewage is difficult to be directly utilized by aerobic organisms in large quantities, only part of the ammonia nitrogen is utilized by biological metabolism and becomes a cell component. Therefore, the removal of ammonia nitrogen is mainly converted into nitrate nitrogen through the nitrification of aerobic bacteria in the aero...

Claims

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Application Information

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IPC IPC(8): C02F9/14C02F3/34C02F3/30C02F101/16
Inventor 邵英倚汤青姜治平邵寿洪曹月丽
Owner JIANGHUA WATER TREATMENT EQUIP PLANT JIANGSU
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