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Method for treating ammonia containing wastewater through simultaneous nitrification and denitrification

A simultaneous nitrification and denitrification technology, applied in the field of sewage treatment, can solve the problems of high price, long domestication time, and increased cost, and achieve the effects of saving carbon source and alkalinity, high pollutant removal rate, and low operating cost

Active Publication Date: 2011-05-11
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] CN1359863A discloses a method for producing ammonia-nitrogen sewage by physical-chemical-biochemical comprehensive treatment of catalytic cracking catalysts. The method is to pretreat high- and low-content ammonia-nitrogen sewage by physical and chemical methods, and then regenerate them after mixing; ammonia nitrogen > 1000mg / L Reverse steam stripping is adopted for the sewage; the sewage with ammonia nitrogen <300mg / L is mixed with domestic sewage and added with methanol, and then enters the anaerobic denitrification and aerobic nitrification treatment process. The biological treatment process of this method adopts the traditional denitrification process, which is not suitable for treating the ammonia nitrogen content. Sewage with high and low COD (chemical oxygen demand, generally indicating the content of organic compounds)
This method adopts the method of acclimating separately and then acclimating in combination. The process is complicated and the acclimatization time is long. Sodium succinate is used as the carbon source in the bacterial acclimatization culture solution, which is a kind of carbon source with high price. The large-scale cultivation of sludge will inevitably bring about an increase in cost, and it is not suitable for large-scale industrial use at present.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] (1) Enrichment culture of aerobic sludge: Take activated sludge from an aerobic aeration tank of a refinery sewage treatment plant, and put it into an aerobic reactor, so that the MLSS in the reactor after inoculating the sludge is 5000mg / L , the method of gradually increasing the concentration of ammonia nitrogen in the matrix is ​​used for enrichment. The initial concentration of ammonia nitrogen in the sewage is 100mg / L, and the concentration of COD is 400mg / L. The concentration of ammonia nitrogen was increased by 100mg / L from the previous time, until the concentration of ammonia nitrogen increased to 1000mg / L, and COD was supplemented while supplementing ammonia nitrogen to maintain the concentration of COD at about 400mg / L. During enrichment: temperature is 25°C; pH 7.5, DO (dissolved oxygen) 2.5mg L -1 about.

[0025] (2) Screening and purification of denitrifying bacteria: Get a certain amount of mud-water mixture obtained in step (1) and dilute different multi...

Embodiment 2

[0029] (1) Enrichment culture of aerobic sludge: Take a certain amount of activated sludge from the aerobic aeration tank of a catalytic sewage treatment plant and put it into the aerobic reactor, so that the MLSS in the reactor after inoculating the sludge is 3000mg / L, the method of gradually increasing the concentration of ammonia nitrogen in the matrix is ​​used for enrichment. The initial concentration of ammonia nitrogen in the sewage is 200mg / L, and the concentration of COD is 600mg / L. Increase by 150mg / L compared with the last time, until it reaches 1500mg / L, supplement COD while supplementing ammonia nitrogen to maintain the COD concentration at about 600mg / L. During enrichment: temperature is 30°C, pH is 7.8, DO (dissolved oxygen) is 3mg·L -1 about.

[0030] (2) Screening and purification of denitrifying bacteria: Get a certain amount of mud-water mixture obtained in step (1) and dilute different multiples and spread it on the beef extract peptone solid medium plate ...

Embodiment 3

[0034] The denitrification sludge obtained in Example 1 is added to the aeration reactor according to the MLSS of 800mg / L to treat the ammoniacal sewage produced in the catalytic cracking catalyst production process. The concentration of main pollutants in this water: COD is 100mg / L on average. L, NH 3 -N is 350 mg / L on average, and the pH is 7.3. First adopt the batch water inlet method, that is, inject the sewage to be treated into the reactor at one time. After running 6 batches, the sludge concentration increases to 1500mg / L, and the removal rate of ammonia nitrogen and total nitrogen reaches more than 90% within 24 hours; On this basis, turn on the water inlet pump and adopt the method of continuous water inlet for treatment. The hydraulic retention time is 24 hours. After 3 days, the system runs stably. The removal rate of ammonia nitrogen reaches 95%, and the removal rate of total nitrogen reaches more than 90%. During the treatment process, methanol was used as a supp...

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Abstract

The invention discloses a method for treating ammonia containing wastewater through simultaneous nitrification and denitrification. The method comprises the following steps: firstly, cultivating denitrifying granular sludge; and secondly, using the denitrifying granular sludge to treat ammonia containing wastewater through simultaneous nitrification and denitrification. The cultivating method of the denitrifying granular sludge comprises the following steps: firstly, inoculating seed sludge in an aerobic reactor, and performing accumulation culture to the aerobic sludge with high ammonia-nitrogen and low chemical oxygen demand (COD) wastewater; secondly, separating and screening aerobic denitrifying bacteria to perform domestication and cultivation; and thirdly, inoculating the domesticated and cultivated aerobic denitrifying bacteria in the denitrifying granular sludge to cultivate and obtain the finished denitrifying granular sludge. The invention adopts the domesticated and cultivated simultaneous nitrification and denitrification sludge treatment catalyst to treat ammonia containing wastewater, and has the characteristics of high removal rate of contaminants, low energy consumption and material consumption and the like; and nitrification and denitrification can be completed in the same reactor, and the short-range simultaneous nitrification and denitrification technology can be applied in actual wastewater treatment.

Description

technical field [0001] The invention belongs to the technical field of sewage treatment, and in particular relates to a biochemical treatment method for ammonia-containing sewage discharged from processes such as synchronous nitrification and denitrification granular sludge treatment catalyst production. Background technique [0002] Ammonia-containing wastewater is a type of wastewater that has an important impact on the environment. For example, the wastewater discharged from the production of some catalysts contains a large amount of ammonia nitrogen, and has the characteristics of high discharge volume and large differences in ammonia nitrogen concentration. Generally, the treatment measures adopted are the strategy of sewage diversion-separation, that is, the ultra-high concentration (2000-20000mg / L) of ammonia nitrogen in sewage can be recovered by stripping method, and the part of wastewater with ammonia nitrogen content lower than 15mg / L can be reused or direct disch...

Claims

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Application Information

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IPC IPC(8): C02F3/30
Inventor 高会杰黎元生许谦李志瑞佟明友唐似茵
Owner CHINA PETROLEUM & CHEM CORP
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