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Reduction control device and method for N2O produced in denitrification dephosphorization process

A technology for denitrification and phosphorus removal and control device, which is applied in the direction of electrical program control, comprehensive factory control, and comprehensive factory control, and can solve problems such as the blank state of large-scale sewage treatment plants and the lack of research on sewage treatment.

Active Publication Date: 2013-01-02
SDIC XINKAI WATER ENVIRONMENT INVESTMENT CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In recent years, with the rapid development of computer technology, the research and application of automatic control have made great progress in many fields, but the research in sewage treatment is still less, and the application of large sewage treatment plants is basically in a blank state

Method used

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  • Reduction control device and method for N2O produced in denitrification dephosphorization process
  • Reduction control device and method for N2O produced in denitrification dephosphorization process

Examples

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Embodiment 1

[0030] 1. To investigate the effect of pH on N in the process of denitrification and phosphorus removal 2 Study on the Impact of O Generation Situations

[0031] Test method: Take the activated sludge rich in about 90% of phosphorus accumulating bacteria and add it to the SBR reactor. For phosphate water distribution, the magnetic stirrer starts to stir, the valve of the nitrogen tank is opened, the flow rate is controlled to be 0.1L / h, nitrogen is exposed for 15 minutes, and the anaerobic phosphorus release reaction is 2 hours. After the anaerobic phosphorus release reaction is completed, the sodium nitrite dosing system is opened. Sodium nitrite with a concentration of 2g / L is quantitatively fed into the SBR reactor with a peristaltic pump at a flow rate of 10ml / min within 2min, and the pH, temperature and dissolved oxygen in the system are detected in real time through the pH and temperature probes, and the dissolved oxygen probes are used online through the PLC. The contr...

Embodiment example 2

[0033] 2. To investigate the effect of temperature on N in the process of denitrification and phosphorus removal 2 Study on the Impact of O Generation Situations

[0034] Test method: Take the activated sludge rich in about 90% of phosphorus accumulating bacteria and add it to the SBR reactor. For phosphate water distribution, the magnetic stirrer starts to stir, and the valve of the nitrogen tank is opened, and the flow rate is controlled to be 0.1L / h and nitrogen is exposed for 15 minutes. The anaerobic phosphorus release reaction was performed for 2 hours. After the anaerobic phosphorus release reaction, the sodium nitrite dosing system was started, and the sodium nitrite with a mass concentration of 2g / L was quantitatively fed into the SBR reactor within 2 minutes at a flow rate of 10ml / min by a peristaltic pump. Real-time detection of pH, temperature and dissolved oxygen in the system through pH and temperature probes, dissolved oxygen probes, and PLC online control syst...

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Abstract

The invention provides a reduction control device and method for N2O produced in the denitrification dephosphorization process and belongs to the technical fields of automatic control of an activated sludge process treatment system and wastewater biological denitrification dephosphorization by means of a sequencing batch reactor (SBR) process. Aiming at solving the technical problem that sodium nitrite adopted to serve as an electron acceptor produces N2O in the denitrification dephosphorization process in the existing SBR process, the device uses an SBR as a main body and comprises a water distribution tank, a peristaltic pump, a magnetic stirring apparatus, an acid adding system, an alkali adding system, an on-line control system connected with a computer and a N2O on-line detecting system. The on-line control system is connected with a water inlet peristaltic pump, a mud discharging system, the acid adding system, the alkali adding system, a temperature control device, the stirring apparatus, a drain valve, a relay on a magnetic valve of a nitrogen aerating system, an oxidation reduction potential (ORP) sensor, a pH sensor and a dissolved oxygen sensor. The N2O on-line detecting system is connected with a N2O microelectrode. The whole process is automatically finished through a programmable logic controller (PLC) of the computer, and the N2O on-line detecting system performs quantitative analysis to the nitrogen conversion condition to confirm dominant mechanism and influencing factors for the N2O production in the denitrification dephosphorization process.

Description

technical field [0001] The technical field of the claimed technical solution is: automatic control technology of activated sludge treatment system, which belongs to the technical field of biological denitrification and phosphorus removal of sewage by SBR method, and is applicable to the research of greenhouse gas generation in the process of denitrification and phosphorus removal. Background technique [0002] N 2 O can absorb long-wave infrared radiation with central wavelengths of 7.78, 8.56 and 16.98, thereby producing a greenhouse effect, and its single-molecule warming potential is that of CO 2 310 times. Although N 2 The content of O in the atmosphere is very low, but the warming effect on the global climate will become more and more significant in the future. It is reported that N in the atmosphere 2 Each doubling of the volume fraction of O will increase the global surface temperature by an average of 0.4°C. N 2 O is a long-lived gas that is stable in the atmosp...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F3/30G05B19/418
CPCY02P90/02
Inventor 彭永臻苗志加王淑莹薛桂松翁冬晨
Owner SDIC XINKAI WATER ENVIRONMENT INVESTMENT CO LTD
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