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Device and method for quickly realizing short range biological denitrification by salinity suppressing combined with fuzzy control

A technology of biological denitrification and fuzzy control, applied in the field of biological denitrification of sewage by SBR method, can solve the problems of complex control factors and rare successful application, achieve high nitrite accumulation rate, save carbon source dosage, Quickly realize the effect of nitrite accumulation rate

Active Publication Date: 2008-01-30
CHONGQING KANGDA ENVIRONMENTAL PROTECTION IND GRP
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Problems solved by technology

However, so far, the NO 2 - The successful application of biological denitrification in practical engineering is rare
The main reason is to affect the NO 2 - The accumulative control factors are more complex, and the system needs long-term and precise process control to change from the whole process to the short process, and nitric acid bacteria can rapidly convert NO 2 - converted to NO 3 - , resulting in the short-cut nitrification and denitrification process that has been realized and can easily be restored to the full-range nitrification process

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  • Device and method for quickly realizing short range biological denitrification by salinity suppressing combined with fuzzy control

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Embodiment

[0037] The actual domestic sewage (pH=7~8, COD=152~286mg / L, TN=80~95mg / L) discharged from a school living area is used as raw water. The selected SBR reactor has an effective volume of 12L, and the COD concentration of the mixed liquid in the reactor is maintained at 200-300mg / L, and the NH 4 + -N concentration is 65~75mg / L, the mass concentration of crude salt is 5.Sg / L, and the initial MLSS in the reaction tank is 3.5~4.0g.L -1 , the aeration rate is constant at 0.3m 3 / h, the mud age is maintained at about 25d, and the reaction temperature is 22°C. After salinity suppression and implementation of fuzzy control, the nitrite accumulation rate (NO 2 - -N / NO x - -N) promptly reached 92% on the second day, and began to keep stable on the seventh day and remained above 96% all the time, which was a typical short-range nitrification type; the removal rate of COD, ammonia nitrogen and total nitrogen in the final effluent of the reactor remained at 90%, 99%, and over 92%. In...

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Abstract

A device for fast realization of shortcut biological denitrification through salinity inhibition combined with fuzzy control and methods thereof pertain to the technical field of sewage biological denitrification of SBR method and are suitable for sewage disposal in nitrogen-containing industry and advanced treatment of town sewage. The invention adjusts the mass concentration of crude salt of inlet water in 5-7.5 g / L (Cond value is 8.92-12.95 mc / cm) to quick realize the accumulation of nitrite in normal temperature above 90 percent by adding crude salt of a certain concentration (the crude salt is obtained directly by basking seawater without any processing) and combining with controlling the time of nitrification and denitrification in real time, the method is designed to solve the problems of long starting time of the existing shortcut biological denitrification technology and difficulty to maintain. The method can not only fast realize the accumulation of nitrite in high proportion stably in reaction system to enable the nitrating types to be fast and long-time stabilized on shortcut nitrification, but also has the advantages of low cost, flexibility in operation and management and seldom causing sludge bulge, etc.

Description

technical field [0001] The invention relates to a process and method for quickly realizing short-range nitrification biological denitrification of nitrogen-containing wastewater, belongs to the technical field of SBR sewage biological denitrification, and is suitable for the treatment of nitrogen-containing industrial wastewater and advanced treatment of urban sewage. Background technique [0002] With the intensification of water eutrophication, the strict requirements of urban sewage discharge standards on effluent total nitrogen, and the gradual increase in sewage discharge, higher requirements are put forward for the operation and management of sewage plants. How to research and develop high-efficiency, low-energy biological denitrification process and device has become an important research topic in the current water treatment field. [0003] The final product of nitrification in the traditional biological denitrification process is nitrate. In fact, from the perspectiv...

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Application Information

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IPC IPC(8): C02F3/12C02F3/30
CPCY02W10/10
Inventor 彭永臻叶柳王淑莹
Owner CHONGQING KANGDA ENVIRONMENTAL PROTECTION IND GRP
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