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Method for fast starting up procedure for nitrifying wastewater of containing ammonia in short range

A fast-start, short-range nitrification technology, applied in aerobic and anaerobic process treatment, sustainable biological treatment, aerobic process treatment, etc. Issues such as nitrogen process development and application

Inactive Publication Date: 2005-01-12
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, due to the lack of systematic research on the operating conditions affecting short-cut nitrification, a quick start method for short-cut nitrification has not been established, which directly affects the development and application of new biological nitrogen removal processes.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] 1) The aerobic activated sludge from the municipal sewage treatment plant is used as the inoculum. The relevant parameters of the sludge are: pH7.02, VSS9.2g / L, SS16.9g / L, and the inoculation amount is 1 / 2 of the effective volume of the bioreactor. 70%. The high-ammonia-nitrogen sludge filtrate of the municipal sewage treatment plant is used as the culture substrate, and the specific water quality is: ammonia nitrogen 30mmol / L, COD200mg / L, pH7.6. First dilute the raw wastewater to an ammonia nitrogen concentration of about 5mmol / L as the reactor feedwater and gradually reduce the dilution factor of the ammonia-containing wastewater to increase the ammonia nitrogen concentration in the feedwater until the feedwater ammonia nitrogen concentration reaches 30mmol / L or directly use the raw wastewater as water ingress. The hydraulic retention time during acclimatization was 16h.

[0022] 2) Control the temperature at about 25°C, the pH at 7.2-7.5, and the dissolved oxygen c...

Embodiment 2

[0025] 1) The aerobic activated sludge from the municipal sewage treatment plant is used as the inoculum. The relevant parameters of the sludge are: pH7.02, VSS9.2g / L, SS16.9g / L, and the inoculation amount is 1 / 2 of the effective volume of the bioreactor. 70%. The high-ammonia-nitrogen sludge filtrate of the municipal sewage treatment plant is used as the culture substrate, and the specific water quality is: ammonia nitrogen 30mmol / L, COD200mg / L, pH7.6. First dilute the raw wastewater to an ammonia nitrogen concentration of about 6mmol / L as the reactor feed water, gradually reduce the dilution factor of the ammonia-containing wastewater to increase the ammonia nitrogen concentration in the feed water, until the feed water ammonia nitrogen concentration reaches 30mmol / L or directly use the raw wastewater as water ingress. The hydraulic retention time during the acclimatization process was 17h.

[0026] 2) Control the temperature at about 28°C, the pH at 7.3-7.5, and the disso...

Embodiment 3

[0029] 1) The aerobic activated sludge from the municipal sewage treatment plant is used as the inoculum. The relevant parameters of the sludge are: pH7.02, VSS9.2g / L, SS16.9g / L, and the inoculation amount is 1 / 2 of the effective volume of the bioreactor. 70%. The simulated ammonia-containing wastewater was used as the culture substrate. The ammonia nitrogen concentration in the influent was 5mmol / L at the beginning, and then the ammonia nitrogen concentration in the influent gradually increased to 30mmol / L. The hydraulic retention time during the acclimatization process was 18h.

[0030] 2) Control the temperature at 26-28°C, pH at 7.2-7.5, and dissolved oxygen concentration at about 2.5mg / L, so as to promote the rapid growth of the entire nitrifying bacteria flora. After 20 days of operation, the removal rate of ammonia nitrogen reached 98% and the operation was stable, indicating that the nitrifying bacteria in the reactor had been enriched to a sufficient number and had h...

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Abstract

The steps of the method are followings: 1) first to put inoculum and aerobic active mud in biologic reactor, inoculum quantity is 70 percent of biologic reactor effective volume; 2) to dilute ammonia containing waste water to that ammonia and nitrogen density is 5-6 mmol / L to be used as reactor water, waterpower stay time that waste water in the biologic reactor is 16-18 hours, temp. is controlled from 25 deg.C to 28 deg.C, pH value is controlled from 7.2 to 7.5, dissolved oxygen density is controlled from 2.5 mg / L to 3.0 mg / L, 3) to value is controlled from 7.2 to 7.5, dissolved oxygen density is controlled from 2.5 mg / L to 3.0 mg / L; 3) to reduce diluting times of ammonia containing waste water progressively to increase ammonia and nitrogen density of the water until it reaches 30 mmol / L or to use raw waste water to be reactor used water directly. When ammonia and nitrogen disloging ratio reaches 97-99 percent, pH value is controlled from 32 deg.C to 35 deg.C, dissolved oxygen density is controlled from 1.0 mg / L to 1.5 mg / L.

Description

technical field [0001] The invention relates to a quick start method for short-range nitrification of ammonia-containing wastewater. The method can realize the rapid start-up of the short-cut nitrification process of ammonia-containing wastewater. Background technique [0002] Short-cut nitrification of ammonia-containing wastewater has the advantages of saving energy, reducing consumption, increasing reaction rate, and reducing excess sludge production. It is currently a hot spot in the research and application of wastewater biological denitrification. The key to starting short-cut nitrification is to establish the competitive advantage of nitrous bacteria in the nitrification system and eliminate nitrobacteria through the regulation of operating conditions. At present, due to the lack of systematic research on the operating conditions affecting short-cut nitrification, a quick start method for short-cut nitrification has not been established, whi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F3/02C02F3/30
CPCY02W10/10
Inventor 郑平卢刚
Owner ZHEJIANG UNIV
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