Nitrosation and nitration method for iron and carbon, reactor using the method and sewage denitrogenation method

A technology of iron-carbon nitrosation and nitrification reactor, which is applied in chemical instruments and methods, oxidized water/sewage treatment, water/sludge/sewage treatment, etc. It can solve problems such as difficult control, many influencing factors, and complex reaction process , to achieve the effect of short start-up time, simple maintenance and few influencing factors

Active Publication Date: 2007-10-17
BEIJING MUNICIPAL RES INST OF ENVIRONMENT PROTECTION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, it relies on the life activities of microorganisms to remove nitrogen from wastewater. Due to the diversity of microorganisms and the complexity of growth conditions, the reaction process is complex, with many influencing factors and difficult to control.

Method used

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  • Nitrosation and nitration method for iron and carbon, reactor using the method and sewage denitrogenation method
  • Nitrosation and nitration method for iron and carbon, reactor using the method and sewage denitrogenation method
  • Nitrosation and nitration method for iron and carbon, reactor using the method and sewage denitrogenation method

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Experimental program
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Effect test

Embodiment 1

[0046] Iron carbon nitrosation and nitrification process

[0047] In the present invention, iron filings and activated carbon are layered or mixed into the reactor, water containing ammonia nitrogen is pumped into the reactor, and oxygen-enriched air is blown into the reactor to control the different pH and dissolution of the reactor. Oxygen, the operating conditions of this reaction are nitrosation requires the pH value of the reaction to be 7-9.5, the pH value of the nitration reaction is 5-7.5, SS4 + -N oxidation load is 0~10kgNH 4 + -N / (m 3 .d), the ascending (or descending) velocity of the empty tower is 0.1-0.5m / h, the hydraulic retention time is 0.4-2h, and the dissolved oxygen concentration in the reactor is greater than 0.5mg / l. The three systems of iron, carbon, and oxygen act synergistically, and electrochemical nitrosation and nitration reactions occur with ammonia to generate a certain amount of nitrite or nitrate, forming a certain proportion of ammonia nitrog...

Embodiment 2

[0050] The nitrosation and nitration reactor using the above reaction principle can adopt two modes of upflow and downflow. The structure of the upward flow reactor is shown in Figure 3. From bottom to top, there are supporting layer 7, backwashing device 2, water inlet and distribution device 4, air diffusion device 3, iron / carbon composite material 6, water collection The device 5 is arranged in the bed (1).

[0051] The structure of the downflow reactor is shown in Figure 4. From bottom to top, there are supporting layer (7), water collecting device (5), backwashing device (2), air diffusion device (3), iron / carbon The composite material (6) and the water inlet and distribution device (4) are arranged in the reactor bed (1).

[0052] The iron-carbon composite material described in an upflow reactor or a downflow reactor is composed of 80% to 90% (volume) iron filings / carbon mixture and 20% to 10% (volume) filler, wherein Iron filings are oil-free carbon steel with a diame...

Embodiment 3

[0059] Nitrosation of iron and carbon—combined process of traditional biological denitrification

[0060] The present invention combines the iron-carbon nitrosation process and the traditional biological denitrification process into a complete new denitrification process. The process flow is shown in Figure 5, and the denitrification effect of the combined process is shown in Figure 6. After ammonia-containing wastewater passes through the iron-carbon nitrosation reactor, control the appropriate pH value and appropriate amount of dissolved oxygen to convert ammonia nitrogen into nitrite, and then use traditional denitrifying bacteria to perform biological denitrification of nitrite-containing wastewater Nitrification and denitrification, through this process, the denitrification treatment of ammonia nitrogen-containing wastewater has been successfully realized. This process is an organic combination of iron-carbon nitrosation process and biological denitrification process.

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Abstract

The invention discloses a nitration method of iron-carbon nitrosation, a reactor therefor and a method of sewage water denitrogenation. Iron filings and active carbon are added in the reactor hierarchically or mixed, water containing ammonia nitrogen is supplied in the reactor and oxygen enriched air is blew in thereof, only inorganic iron-carbon in condition of aeration, ammonia nitrogen is conversed into nitrite and nitrate steadily. The reactor is composed of a supporting layer, a back purge system, a water-inlet- distribution device, a air diffuser, iron/carbon composite material, a drift eliminator and bed body, nitrosation or nitration is finished in action of ammonia sewage water. The reactor is combined with a denitrify reactor, a anaerobic bioreactor, or used as a aeration biological filter of biology filler to finish denitrification process of nitrogen sewage water. The reactor has advantages of stable performance, high efficiency, low power cost and simple maintenance. An integrated denitrification technics is formed in the reactor, denitrification efficiency of the whole flow is improved.

Description

technical field [0001] The invention belongs to the field of sewage denitrification treatment, and relates to a method for using iron carbon in nitrosation and nitration in sewage treatment, a nitrosation and nitration reactor using the method, and a sewage denitrification method using the method and the reactor. Background technique [0002] Tongji University's master's thesis (2006.7), the author is Zhi Xiahui's "Research on the Coupling Denitrification Process of Iron Electrolysis and Biological Method", which disclosed the coupling denitrification process of iron electrolysis and biological method. In this process, an internal iron electrolysis reaction device is installed in the SBR reactor, and the short-range nitrification and denitrification denitrification is realized through the coupling reaction of chemical and biological degradation. But its denitrification mechanism is: coupled short-range denitrification is only the result of the biochemical reaction of biologi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/74C02F101/16
Inventor 杜兵孙艳玲刘寅曹建平何然
Owner BEIJING MUNICIPAL RES INST OF ENVIRONMENT PROTECTION
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