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Method for quickly starting short-cut nitrification and denitrification of ammonia-containing wastewater

A short-range nitrification and quick-start technology, applied in chemical instruments and methods, biological water/sewage treatment, water/sludge/sewage treatment, etc. Stability and other issues, to achieve the effect of improving the degradation rate of ammonia nitrogen, ensuring long-term stable operation, and shortening the start-up time

Active Publication Date: 2013-10-30
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] At present, although the short-cut nitrification and denitrification process has entered the stage of industrial application, there are generally problems such as small load, low removal rate, unstable operation, and long start-up time. It cannot effectively treat wastewater with low COD and high ammonia nitrogen concentration. The process is running without consideration of total nitrogen removal
This greatly limits the development and application of short-cut nitrification and denitrification technology.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Example 1 The method for cultivating the inoculum of nitrifying bacteria can be carried out according to existing methods in the art, such as the method described in CN201010221166.8, and the specific process is as follows.

[0030] The first stage: the aerobic activated sludge of the sewage treatment plant is used as the starting material (the aerobic activated sludge of any sewage treatment plant contains nitrifying bacteria) to enrich the nitrifying bacteria group, and the enrichment culture medium used is composed of (NH 4 ) 2 SO 4 (NH 4 + -N initial concentration is 150 mg / L, final concentration is 1000 mg / L), FeSO 4 ·7H 2 O (Fe 2＋ Concentration is 12mg / L), MgSO 4 ·7H 2 O (Mg 2＋ Concentration is 18mg / L), NaCl (Na ＋ Concentration is 800mg / L), CaCl 2 (Ca 2＋ Concentration is 16mg / L) and KH 2 PO 4 (K ＋ Concentration is 260mg / L). During the enrichment process, NaHCO 3 The solution adjusts the pH. Culture conditions: temperature is 24°C; pH is 6.0-...

Embodiment 2

[0033] Embodiment 2 Preparation of denitrifying bacteria agent

[0034] 1. Arthrobacter FDN-1 and Flavobacterium waterii FDN-2 were respectively inoculated on beef extract peptone solid medium and activated in a constant temperature incubator at a temperature of 30°C. The medium formula was: beef extract: 5g / L, Peptone: 10g / L, NaNO 2 : 1g / L, add 2.0% agar.

[0035] 2. Scrape a ring of solid bacteria with an inoculation loop to inoculate in the beef extract peptone liquid culture solution, and culture under aerobic conditions at a temperature of 25~35°C and 150~240rpm with shaking for 1~3 days to logarithmic growth phase to obtain liquid bacteria agent seed solution; medium formula is: beef extract: 5g / L, peptone: 10g / L, NaNO 2 : 1g / L.

[0036] 3. Combining the above-mentioned Arthrobacter FDN-1 and Flavobacterium waterii FDN-2 seed liquids according to the two ratios of 1:1 and 0.5:1 respectively in a reactor with a good stirring system for amplified culture, the sub The c...

Embodiment 3

[0039] With the nitrifying bacteria cultivated in Example 1 as the inoculum, the MLSS after inoculation is 1.0g / L, and the ammonia-containing wastewater with a self-prepared concentration of 300mg / L is used as the reactor feedwater, the pH is controlled at 7.9, and the temperature is controlled at 20°C The dissolved oxygen concentration is about 1.5~4.0mg / L. Water is fed intermittently first, and ventilation is stopped after 24 hours of reaction. After natural settlement, the supernatant is discharged, leaving bacteria, and then new ammonia-containing wastewater is added to the reactor. When the removal rate of ammonia nitrogen is greater than 90%, increase the concentration of ammonia nitrogen in the influent, and the range of each increase is 100mg / L. After 5 days, the concentration of ammonia nitrogen in the influent reached 700mg / L, and the nitrification rate reached 80% at this time, so it was changed to continuous operation, and the denitrifying bacteria agent A of Examp...

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Abstract

The invention relates to a method for quickly starting short-cut nitrification and denitrification of ammonia-containing wastewater. The method comprises the following steps of: firstly putting inocula into a bioreactor, wherein the inocula are enriched nitrobacteria or mixtures of the nitrobacteria and aerobic activated sludge in sewage plants; adopting the two operation modes including batch injection and continuous injection to start a system; and adding the nitrobacteria during batch injection, and adding denitrifiers during continuous injection. Compared with the prior art, the method has the advantages of low start requirement, high start speed, capability of treating high-concentration ammonia-containing wastewater and the like.

Description

technical field [0001] The invention belongs to the technical field of sewage treatment, and in particular relates to a rapid start-up method for short-range nitrification and denitrification of ammonia-containing wastewater. Quick start method. Background technique [0002] As an important research direction of water pollution control, biological denitrification of wastewater has undergone a process from mature traditional biological denitrification to new biological denitrification. The new biological denitrification process provides a feasible way for the treatment of low COD (chemical oxygen demand, an indicator of carbon source content, COD value is measured by Cr method in this application) high ammonia nitrogen wastewater. In particular, nitrosation biological denitrification technology has attracted widespread attention due to its advantages of reducing energy consumption, saving carbon sources, and reducing sludge production, and has become one of the hotspots in t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F3/30C02F3/34
Inventor 高会杰孙丹凤
Owner CHINA PETROLEUM & CHEM CORP
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