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Method for culturing shortcut nitrification granular sludge by combining dual inhibition of FA and FNA

A granular sludge and short-range nitrification technology, applied in chemical instruments and methods, sludge treatment, biological sludge treatment, etc., can solve the problems of difficult increase of nitrifying bacteria biomass, low efficiency of ammonia nitrogen oxidation, slow growth of nitrifying bacteria, etc. Achieve the effect of saving denitrification carbon source, increasing the amount of treated water and drainage ratio, and compact structure

Inactive Publication Date: 2011-09-07
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The growth of nitrifying bacteria is slow and the cell yield is low, which makes it difficult to increase the biomass of nitrifying bacteria in traditional reactors, which makes the ammonia nitrogen oxidation efficiency of most nitrification processes low

Method used

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  • Method for culturing shortcut nitrification granular sludge by combining dual inhibition of FA and FNA
  • Method for culturing shortcut nitrification granular sludge by combining dual inhibition of FA and FNA
  • Method for culturing shortcut nitrification granular sludge by combining dual inhibition of FA and FNA

Examples

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Effect test

Embodiment 1

[0031] Inoculate the aerobic activated sludge for urban domestic sewage into the SBR reactor, the sludge concentration is 5000mg / L, the total volume of the reactor is 12L, and the effective volume is 11L. COD concentration in domestic sewage water is 200-300mg / L, PO 4 3- -P concentration is 4-5mg / L, ammonium chloride is artificially added to make NH 4 + -N concentration is 50-200mg / L, and the corresponding FA concentration is between 5mg / L and 15mg / L. 2 2H 2 O 0.01g / L, MgSO 4 ·7H 2 O 0.02g / L, nutrient solution 3ml / L. The conditions of the reactor are: influent pH 7.5, 6 cycles per day, 4 hours per cycle, each cycle includes 8 minutes of water inflow, 3.5 hours of aerobic aeration, 5 minutes of drainage and 2-16 minutes of idle time, and the settling time is divided into Four stages are performed:

[0032] Stage I (1-12 cycles), sludge domestication stage: influent NH 4 + - The concentration of N is 50mg / L, the precipitation time is 15min, and the idle time is 2min; ...

Embodiment 2

[0039] Inoculate the aerobic activated sludge for treating urban domestic sewage into the SBR reactor, the sludge concentration is 6000mg / L, the total volume of the reactor is 12L, and the effective volume is 11L. The actual domestic sewage is used, and the domestic sewage is drawn from the septic tank of a family area of ​​a university to the water storage tank every day. The pH value of the influent water is 7.8, and the remaining water quality indicators are: COD 250-320mg / L, NH 4 + -N 40~80mg / L, PO 4 3- The concentration of -P was 2mg / L. Due to the low concentration of ammonia nitrogen in the influent, ammonium chloride is artificially added to make the concentration of ammonia nitrogen in the influent 400-500mg / L, and the corresponding FA concentration is between 30mg / L and 40mg / L. Run 6 cycles per day, each cycle is 4 hours, each cycle includes 8 minutes of water intake, 3.5 hours of aerobic aeration, 5 minutes of sedimentation time, 5 minutes of drainage and 12 minut...

Embodiment 3

[0041] Inoculate part of the activated sludge for treating urban domestic sewage and the activated sludge for treating actual domestic sewage into the SBR reactor, the ratio of the two is about 1:1, the amount of inoculated sludge is 4L, and the concentration is 4500mg / L. Use actual domestic sewage to start the reactor, add ethanol as an organic carbon source manually, and keep 400mg / L unchanged, so that the NH 4 + -N concentration is 200-300mg / L, the corresponding FA concentration is between 15mg / L and 25mg / L, and other nutrients are the same as in Example 1. Keep the temperature in the reactor constant at 28°C, the pH of the influent water is 7.5-8.0, the dissolved oxygen is kept at 4 mg / L, the updraft is provided at 1.5 cm / s, and the sludge age is 15 days. After 10 days of stable operation, it was observed that fine sand-like small granular sludge was formed, and after 40 days, the granular sludge grew into dark brown granular sludge. The removal of ammonia nitrogen by th...

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Abstract

The invention relates to a method for culturing shortcut nitrification granular sludge by combining the dual inhibition of free ammonia (FA) and free nitrous acid (FNA), and belongs to the technical field of the biological denitrification of wastewater. The method comprises the following steps of: inoculating flocculent active sludge to a sequencing batch reactor (SBR), and pumping wastewater which contains chemical oxygen demand (COD) and ammonia nitrogen and serves as inflow from the bottom of the reactor; after a liquid level is reached, starting a stirrer and a blast blower to perform aerobic nitration, degrading organic matters and oxidizing the ammonia nitrogen to form nitrites; after the nitration is finished, stopping aerating and stirring, precipitating to obtain supernatant containing the nitrites, and discharging sewage from a drainage valve, wherein in the culture conditions, the temperature of the reactor is between 25 and 30 DEG C, NaHCO3 solution is added after aeration is performed for 30 minutes, so that the pH value is kept between 7.5 and 8.0, dissolved oxygen is between 3 and 5 mg / L, upflow is provided at the speed of between 1.0 and 1.5 cm / s, and sludge age is between 12 and 15 days; and culturing for 30 to 50 days to obtain the shortcut nitrification granular sludge. By the method, the removal efficiency of a denitrification system can be improved effectively, oxygen supply and denitrification carbon sources can be saved, the yield of the sludge can be reduced, the volume of the reactor can be reduced, and the construction and operating cost can be saved.

Description

technical field [0001] The invention relates to a method for cultivating short-range granular sludge, which is a method for cultivating short-range nitrification granular sludge through the double inhibition of free ammonia (Free Ammonia, FA) and free nitrous acid (Free Nitrous Acid, FNA), which belongs to wastewater biological denitrification Dealing with technical fields. Background technique [0002] The eutrophication of water bodies caused by nitrogen and phosphorus pollution has always been one of the main problems faced by countries all over the world, and it is also the difficulty and focus of water treatment. my country's water pollution continues to intensify, the discharge standards of urban sewage treatment plants continue to increase, and the shortage of water resources has begun to restrict the development of China's economy and society. Therefore, the denitrification and phosphorus removal of sewage in cities and their adjacent areas has become an important pa...

Claims

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Application Information

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IPC IPC(8): C02F3/12C02F11/02
CPCY02W10/10Y02W10/20
Inventor 彭永臻吴蕾王淑莹刘旭李凌云
Owner BEIJING UNIV OF TECH
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