Normal temperature low-ammonia-nitrogen nitrosation starting method

A low-ammonia nitrogen nitrification and nitrosation technology, applied in chemical instruments and methods, water/sludge/sewage treatment, biological water/sewage treatment, etc., can solve problems such as failure, narrow applicability, and singleness, and achieve speed improvement Effect

Inactive Publication Date: 2012-10-03
BEIJING UNIV OF TECH
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AI Technical Summary

Problems solved by technology

There are few studies on how to achieve rapid start-up under the normal temperature and low ammonia nitrogen conditions of domestic sewage, and the strategy of us

Method used

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  • Normal temperature low-ammonia-nitrogen nitrosation starting method
  • Normal temperature low-ammonia-nitrogen nitrosation starting method
  • Normal temperature low-ammonia-nitrogen nitrosation starting method

Examples

Experimental program
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Effect test

Embodiment 1

[0030] Example 1 see figure 1

[0031] The inoculation sludge of 1# reactor comes from the nitrification sludge of Beijing Municipal A Wastewater Treatment Plant. It adopts artificial water distribution, and directly operates with limited oxygen after inoculation. The dissolved oxygen concentration is controlled at 0.30~0.40mg / L. The initial nitrosation rate of inoculated sludge in 1# reactor was 50%, indicating that the inoculated sludge has certain nitrosation performance. The difference in affinity between AOB and NOB for dissolved oxygen can be used, and the initial accumulation of nitrite nitrogen can be achieved through oxygen limitation control. In the 1-14 cycle, the sludge is in the adaptation period of low oxygen conditions, the sedimentation effect is reduced, and the treatment effect is not stable. With continuous acclimatization under oxygen-limited conditions, the nitrosation rate gradually increased. After 7 days (14 cycles) of acclimatization, the ammonia ni...

Embodiment 2

[0032] Example 2 see figure 2

[0033] The inoculum sludge of 2# reactor comes from the nitrification sludge of B sewage treatment plant in Beijing. In the determination test of the initial properties of the inoculated sludge, no accumulation of nitrite nitrogen was found, and the initial nitrification rate was almost 0%, which was the whole process of nitrification sludge.

[0034]2# adopts the same water distribution plan and start-up strategy as 1#, and operates under the condition of oxygen limitation (DO=0.30~0.40mg / L). However, after 30 days (58 cycles) of cultivation, there was no accumulation of nitrite nitrogen in the water. In the periodic test, nitrite was not seen as an intermediate product, and ammonia nitrogen was directly oxidized to nitrate. The conversion load of ammonia nitrogen is also low, ranging from 0.028 to 0.069 kgN / kgMLSS / d. The 2# reactor was artificially distributed with water, and the concentration of ammonia nitrogen in the influent water was...

Embodiment 3

[0035] Embodiment 3 see image 3

[0036] The inoculum sludge of 3# reactor comes from the nitrification sludge of B sewage treatment plant in Beijing. In the determination test of the initial properties of the inoculated sludge, no accumulation of nitrite nitrogen was found, and the initial nitrification rate was almost 0%, which was the whole process of nitrification sludge.

[0037] The effluent of a septic tank in a residential area in Beijing was treated by A / O phosphorus removal process as influent water to start nitrosation, and the COD in the influent water was 43.05±12.35mg / L. After 30 days (32 cycles) of operation under oxygen-limited conditions (DO=0.30~0.40mg / L), there was no accumulation of nitrite nitrogen in the effluent, and all ammonia nitrogen was oxidized to nitrate nitrogen. During the cycle test, no accumulation of nitrite was found. The 4# reactor passed the A / O secondary effluent, and the concentration of ammonia nitrogen in the influent water was 85....

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Abstract

A normal temperature low-ammonia-nitrogen nitrosation starting method belongs to the field of urban sewage treatment and reclamation. Researches show that nitrosation starting can be achieved in short time by controlling condition of low dissolved oxygen (DO=0.30mg/L) and inoculating sludge with certain nitrosation effect. If whole course nitration sludge is inoculated, no accumulation of nitrite occurs within 30 days in a water distribution test, no accumulation of nitrite occurs in 30 days in a reactor which utilizes the A/O dephosphorization process processing water as a research object, and the nitrosation starting fails accordingly. Nitrite accumulation can occur by adopting the mode of high-low gradient oxygen limit culture, domesticating the sludge for 10 days under the condition that DO=0.70-0.80mg/L, then controlling condition of low dissolved oxygen (0.30-0.40mg/L) to enable the reactor to discharge water if the whole course nitration sludge is inoculated. Over 90% of nitrosation rate can be achieved within 38 days by continuously domesticating the sludge under the condition of the dissolved oxygen, so that nitrosation can be successfully started.

Description

technical field [0001] The invention belongs to the field of urban sewage treatment and recycling. Specifically, it relates to a rapid start-up method specially used for nitrifying sludge with different attributes under normal temperature and low ammonia nitrogen level. Background technique [0002] At present, most urban sewage treatment plants use traditional processes, such as A 2 / O, oxidation ditch, biological aerated filter and other processes or their improved processes. Although it can achieve good results in the removal of organic matter, it has not been effective in the removal of nutrients nitrogen and phosphorus, especially the removal of nitrogen, which has always been a difficult point. These processes all adopt the traditional denitrification mechanism in denitrification, that is, the organic nitrogen and ammonia nitrogen in the water body are oxidized into nitrite nitrogen, and then further oxidized into nitrate nitrogen, and then reduced into nitrogen thro...

Claims

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Application Information

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IPC IPC(8): C02F3/12
CPCY02W10/10
Inventor 李冬吴迪刘丽倩仲航张昭张功良苏东霞高伟楠王斌孙宇李德祥杨卓崔少明周利军曾辉平张杰
Owner BEIJING UNIV OF TECH
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