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Quick start method for short-range deep denitrification by SBR (Sequencing Batch Reactor) process at low temperature

A technology of deep denitrification and low temperature conditions, which is applied in chemical instruments and methods, multi-stage water/sewage treatment, water/sludge/sewage treatment, etc., to achieve nitrification reaction, stable operation, and remarkable effects of energy saving and consumption reduction

Active Publication Date: 2011-06-01
北控水务(中国)投资有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Especially for newly-built sewage treatment plants, if the start-up and commissioning stage is under the condition of low water temperature, then low temperature is a huge challenge for the successful start-up of sewage treatment plants

Method used

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  • Quick start method for short-range deep denitrification by SBR (Sequencing Batch Reactor) process at low temperature
  • Quick start method for short-range deep denitrification by SBR (Sequencing Batch Reactor) process at low temperature
  • Quick start method for short-range deep denitrification by SBR (Sequencing Batch Reactor) process at low temperature

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Experimental program
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Effect test

Embodiment 1

[0034] The SBR short-range deep denitrification quick start process runs continuously for 45 cycles, the SRT is controlled at about 35 days, and the temperature is within the range of 11-17 °C;

[0035] Taking domestic sewage discharged from a university as the research object (pH=7-7.8, COD=160-320mg / L, NH 4 + -N=75-90 mg / L). The test device adopts an effective volume of 7.0m 3 The pilot scale SBR reactor, the water volume per cycle is 2.5m 3 , after the water inflow is completed, the COD concentration of the mixed liquid in the reactor is maintained at 120-240mg / L, and the NH 4 + -N concentration is 20-35mg / L. In the rapid start-up stage of the short-range deep denitrification process, since the pilot-scale SBR reactor is used, the temperature control device cannot be used to control the reaction temperature, and the reactor temperature can only change with the change of the ambient temperature. The time of the rapid start-up phase is the period of transition from wint...

Embodiment 2

[0047] The SBR short-range deep denitrification rapid start-up process runs continuously for 55 cycles, the SRT is controlled at about 30 days, and the temperature is within the range of 11-17°C;

[0048] Taking domestic sewage discharged from a family area of ​​a university as the research object (pH=7-7.8, COD=160-320mg / L, NH 4 + -N=75-90 mg / L). The test device adopts a small-scale SBR reactor with an effective volume of 10L, and the water treatment volume per cycle is 4L. After the water intake is completed, the COD concentration of the mixed liquid in the reactor is maintained at 150-260mg / L, and the NH 4 + -N concentration is 25-45mg / L. In the rapid start-up stage of the short-range deep denitrification process, the temperature is controlled within the range of 11-17°C. The external carbon source is ethanol with a volume fraction of 99.5%. The specific operation steps of each cycle are as follows:

[0049] I use the SBR reactor with an effective volume of 10L for th...

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Abstract

The invention relates to a quick start method for a nitrogenous wastewater biological treatment technique, in particular to a quick start method for a short-range deep denitrification technique by an SBR (Sequencing Batch Reactor) process at low temperature. The existing short-range deep denitrification technique can not be easily started at low temperature. The time for the short-range deep denitrification in the starting stage in the invention is short. The method provided by the invention comprises the steps of water injecting, aerating, denitrifying, precipitating, water discharging, sludge discharging, and standing. In the invention, frequency is used as the process control parameter in the aerating stage, and the retention time of the sludge is kept within 30-40 days, thereby realizing the quick start of short-range deep denitrification by the SBR process at low temperature (11-17 DEG C). The invention has the advantages of high denitrification efficiency and operating cost saving, can easily realize automation, can realize quick start at low temperature, and can also stably operate at normal temperature.

Description

Technical field: [0001] The invention relates to a rapid start-up method of a nitrogen-containing wastewater biological treatment process, especially a method capable of quickly starting a short-range deep denitrification process under low temperature conditions, which is suitable for the treatment of nitrogen-containing industrial wastewater and advanced treatment of domestic sewage in cold regions. Background technique [0002] With the rapid development of the economy and the improvement of environmental protection awareness, my country has invested a lot of manpower and material resources in water pollution control, but the status quo of water eutrophication has not improved, but has a tendency to deteriorate day by day. The excess of nitrogen and phosphorus in water body is the main cause of eutrophication in water body. Biological nitrification and denitrification is currently the most economical and practical method for denitrification of sewage. The traditional deni...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/14C02F3/30
Inventor 王淑莹顾升波杨培
Owner 北控水务(中国)投资有限公司
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