Energy-saving process for treating high ammonia nitrogen waste water

A wastewater treatment, high ammonia nitrogen technology, applied in water/sewage multi-stage treatment, oxidized water/sewage treatment, water/sludge/sewage treatment, etc. Low problems, to achieve the effect of saving pharmaceutical consumption, high processing efficiency, and low operating costs

Inactive Publication Date: 2008-06-11
UNIV OF SCI & TECH LIAONING
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Problems solved by technology

It solves the problems of low denitrification rate, difficult COD degradation, difficult effluent standard and high treatment cost in the treatment of high ammonia nitrogen wastewater

Method used

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  • Energy-saving process for treating high ammonia nitrogen waste water
  • Energy-saving process for treating high ammonia nitrogen waste water

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Embodiment Construction

[0007] The new energy-saving high ammonia nitrogen wastewater treatment process includes pretreatment-short-range nitrification-micro-electrolysis-post-treatment.

[0008] In the pretreatment stage, the Kjeldahl nitrogen is converted into ammonia nitrogen as much as possible, and then the ammonia nitrogen in the wastewater is nitrified to the nitrite nitrogen stage in the aerobic short-range nitrification tank. Ammonia nitrogen is converted to nitrite nitrogen through a short-cut nitrification reaction. The temperature in the short-range nitrification biological reaction tank is controlled at 25-40°C, the pH value is 8.0-9, the sludge age is 50-80 days, the DO is controlled at 2-5mg / L, the hydraulic retention time is 20-40 hours, and COD removal is realized at the same time Rate 20%-30%. The short-range nitrification tank can be filled with film (such as figure 1 ) or suspended sludge (such as figure 2 ) in two ways (the operating conditions are as described above).

[00...

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Abstract

In the invention discloses an energy-saving treatment method of high strength ammonia wastewater, which comprises procedures of pre-processing, short-cut nitrification, micro-electrolysis and after-treatment. The method is characterized in that firstly wastewater is preprocessed to transform Kjeldahl nitrogen into amino nitrogen, then the wastewater enters a main body of the process to be processed. In a short-cut nitrification tank, the amino nitrogen in the wastewater is nitrated and controlled to a nitrite nitrogen stage, then a micro-electrolysis reactor is employed to replace anaerobic denitrification or ammonoxidation process to be denitrified, the nitrite nitrogen and organic pollutants in the wastewater are highly effectively degraded and are further subsequently processed by employing biological method and physicochemical oxidation method, and outlet water of the wastewater reaches standards. The method makes full use of water quality of raw water, the additional medicament consumption is saved, the process flow is shortened, and the process operation is simplified. Compared with the conventional denitrification process, the denitrification rate is increased, the total nitrogen removal rate reaches 60%-75%, and the treatment effect of degrading hardly degradable organics is remarkably increased. The treatment cost of wastewater per ton by employing novel method can be reduced by 30-50%.

Description

technical field [0001] The invention relates to a wastewater denitrification treatment method, in particular to an energy-saving and efficient treatment method for high-ammonia-nitrogen wastewater. Background technique [0002] There have been many literature reports on the research in the field of iron-carbon micro-electrolysis technology. However, these reports are mainly aimed at the degradation of refractory organic matter by micro-electrolysis, and micro-electrolysis is applied to the treatment process of nitrogen-containing wastewater as a means of denitrification, especially for denitrification pretreatment of high-ammonia nitrogen wastewater. It has not been reported in other periodicals and magazines. When the traditional process is used to treat high-ammonia-nitrogen wastewater, the ammonia-nitrogen pretreatment must be carried out first. The usual method is to add a large amount of alkali and hot steam to blow off the ammonia-nitrogen, which greatly increases the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/14C02F3/02C02F1/72
CPCY02W10/10
Inventor 单明军闽玉国
Owner UNIV OF SCI & TECH LIAONING
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