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Quick start method for treating ammonia-containing wastewater by A/O process

A fast-start, wastewater technology, used in aerobic and anaerobic process treatment, biological water/sewage treatment, water/sludge/sewage treatment, etc. Problems such as long startup time, to achieve the effect of high processing efficiency and long-term stable operation

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, and some operating The process does not consider whether the total nitrogen is removed
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

[0027] 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.

[0028] 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

[0031] Embodiment 2 Preparation of denitrifying bacteria agent

[0032] The denitrification bacteria agent used in the examples is prepared according to the method described in CN201010536065.x embodiment 1, and the liquid bacterial suspensions A, B, C, D, and E obtained through amplified culture are collected and concentrated, and the collection and concentration adopts the condition of 10,000 revolutions The thalline obtained after centrifugation for 5 minutes was added with nutrient solution and preservative to obtain denitrification bacteria agents A, B, C, D, E, wherein the sum of the volumes of the thallines accounted for about 30% of the total volume of the denitrification bacteria agent. %about. NH per liter of nutrient solution 4 + -N 、Fe 2＋ , Mg 2＋ 、K ＋ , Ca 2＋ The molar configuration ratio of these five cations is 2000:5:20:20:15, the NH in the nutrient solution 4 + -N molar concentration is 4~40mmoL / L.

Embodiment 3

[0034] First, add activated sludge to the A / O reactor according to 10% of the effective volume of the reactor. Then use the nitrifying bacteria cultivated in Example 1 as the inoculum, and insert the O reactor according to the inoculation amount of 0.8g / L according to the MLSS, the pH is controlled at 7.9, the temperature is controlled at 20°C, and the dissolved oxygen concentration is 1.5~3.0mg / L about. The next day, the nitrogen-removing bacterial agent B of Example 2 was added to reactor A according to the volume ratio of 1%, the pH value was controlled at 8.0, and the dissolved oxygen concentration was 0.5-1.0 mg / L. The ammonia-containing wastewater with a concentration of 250mg / L is used as the feed water of the O reactor, and the supernatant of the O reactor is used as the feed water of the A reactor. Water is fed intermittently first, and each batch is reacted for 24 hours. After the O reactor stops aeration, the A reactor stops stirring, and after natural settlement, ...

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Abstract

The invention relates to a method for quickly starting short-cut nitrification and denitrification of an A / O system. The method comprises the following steps of: firstly putting inocula into a bioreactor, wherein the inocula are enriched nitrobacteria and nitrous acid denitrifiers or mixtures of aerobic activated sludge in sewage plants; adopting two operation modes including batch injection and continuous injection to start a system; and adding the nitrobacteria during batch injection, and adding the 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 quick-start method for short-range nitrification and denitrification of ammonia-containing wastewater by A / O process, which can realize short-range nitrification and denitrification of ammonia-containing wastewater, especially high-concentration ammonia-containing wastewater Rapid start-up of nitrification and denitrification process. 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 in this application) high ammonia nitrogen wastewater. In particular, nitrosation biological denitr...

Claims

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Application Information

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IPC IPC(8): C02F3/30C02F3/34
Inventor 高会杰韩建华李宝忠
Owner CHINA PETROLEUM & CHEM CORP
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