Method for improving activity of methanogens while reducing high-concentration ammonia nitrogen in anaerobic process

A high-concentration methanogenic bacteria technology, applied in anaerobic digestion treatment, chemical instruments and methods, water/sludge/sewage treatment, etc., can solve problems such as inhibition, save treatment costs, shorten treatment time, and increase methane Yield effect

Inactive Publication Date: 2011-11-23
NANJING UNIV
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  • Claims
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Problems solved by technology

[0006] In order to solve the problem of the high concentration of ammonia nitrogen in the anaerobic reactor inhibiting the activity of methanogens, improve the effect of anaerobic biological treatment of wastewater, and at the same time recycle the ammonia nitrogen resources in the wastewater, the present invention provides a synchronous improvement method for reducing the high concentration of ammonia nitrogen in the anaerobic process. The method for the activity of methanogens, the invention is based on the magnesium ammonium phosphate (MAP) crystallization method wastewater treatment technology to reduce the concentration of ammonia nitrogen in the anaerobic process and simultaneously improve the activity of anaerobic methanogens

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  • Method for improving activity of methanogens while reducing high-concentration ammonia nitrogen in anaerobic process

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Embodiment 1

[0023] Table 1 is the A index of high-concentration nitrogen-containing organic wastewater

[0024] water quality index COD (mg / L) Total nitrogen (mg / L) Ammonia nitrogen (mg / L) pH range change 2970～3240 1980～2300 490～520 6.5～7.8

[0025] Such as figure 1 As shown, the method for reducing the high concentration of ammonia nitrogen in the anaerobic process and simultaneously improving the activity of methanogens, the steps are:

[0026] (1) The upper part of the anaerobic reactor is equipped with a three-phase separator, a biogas collection port and a water outlet, and the wastewater is passed into the anaerobic reactor. After mechanical stirring, the wastewater and anaerobic granular sludge are fully mixed and contacted. After the degradation products are separated by the three-phase separator, the biogas enters the gas collection chamber through the biogas collection port for collection, the anaerobic granular sludge settles to the lower part of...

Embodiment 2

[0031] Table 2 is the B index of high-concentration nitrogen-containing organic wastewater

[0032] water quality index COD (mg / L) Total nitrogen (mg / L) Ammonia nitrogen (mg / L) pH range change 2190～3770 2150～3700 810～1680 7.5～8.3

[0033] combine figure 1 , reducing the high concentration of ammonia nitrogen in the anaerobic process and synchronously improving the method for the activity of methanogens, the steps are:

[0034] (1) The upper part of the anaerobic reactor is equipped with a three-phase separator, a biogas collection port and a water outlet, and the wastewater is passed into the anaerobic reactor. After mechanical stirring, the wastewater and anaerobic granular sludge are fully mixed and contacted. After the degradation products are separated by the three-phase separator, the biogas enters the gas collection chamber through the biogas collection port for collection, the anaerobic granular sludge settles to the lower part of the rea...

Embodiment 3

[0039] Table 3 is the C index of high-concentration nitrogen-containing organic wastewater

[0040] water quality index COD (mg / L) Total nitrogen (mg / L) Ammonia nitrogen (mg / L) pH range change 3270～3540 2290～2870 920～1530 6.3～7.2

[0041] combine figure 1 , reducing the high concentration of ammonia nitrogen in the anaerobic process and synchronously improving the method for the activity of methanogens, the steps are:

[0042] (1) The upper part of the anaerobic reactor is equipped with a three-phase separator, a biogas collection port and a water outlet, and the wastewater is passed into the anaerobic reactor. After mechanical stirring, the wastewater and anaerobic granular sludge are fully mixed and contacted. After the degradation products are separated by the three-phase separator, the biogas enters the gas collection chamber through the biogas collection port for collection, the anaerobic granular sludge settles to the lower part of the rea...

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Abstract

The invention discloses a method for improving the activity of methanogens while reducing high-concentration ammonia nitrogen in the anaerobic process, and belongs to the field of water treatment. The method comprises the following steps of: contacting high-concentration nitrogen-containing organic waste water with anaerobic microorganisms fully in an anaerobic reactor to perform reaction, and degrading to obtain a large amount of ammonia nitrogen; introducing the waste water into a crystallizing sedimentation tank partially, adding a dissoluble magnesium source and phosphates in a certain ratio, and regulating the pH value to 7.0 to 10.0, so that Mg<2+>, NH4<4+> and PO4<3-> in the waste water react to generate an ammoniomagnesium phosphate (MAP) crystal, and precipitating the MAP crystal; and stabilizing the pH value of treated supernatant to 6.5 to 8.0 by a pH regulating tank, and refluxing to the anaerobic reactor. By the method, ammonia nitrogen resources in the waste water can be recovered effectively, the phenomenon of the reduction of the activity of anaerobic sludge due to overhigh concentration of the ammonia nitrogen can be prevented, and the operation effect of the anaerobic reaction and the yield of methane can be improved.

Description

technical field [0001] The invention relates to a method for reducing the high concentration of ammonia nitrogen in the anaerobic process and synchronously improving the activity of methanogens, in particular to a wastewater treatment technology based on the magnesium ammonium phosphate (MAP) crystallization method to reduce the concentration of ammonia nitrogen in the anaerobic process and synchronously increase the activity of anaerobic methanogens Integrated combination process. technical background [0002] In recent years, wastewater anaerobic biological treatment technology has been widely used in the treatment of various types of high-concentration organic wastewater due to its advantages such as low energy consumption, low sludge yield, recyclable biogas, and stable operation. However, with the rapid development of my country's industry, the composition of high-concentration organic wastewater has become increasingly complex, and a large number of toxic substances co...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/14C02F3/28
CPCY02E50/30
Inventor 任洪强李秋成丁丽丽许柯任鑫坤
Owner NANJING UNIV
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