Automatic fed-batch type efficient iron salt denitrification reaction device and automatic fed-batch type efficient iron salt denitrification reaction method for bacteria

Abstract

The invention discloses an automatic fed-batch type efficient iron salt denitrification reaction device and an automatic fed-batch type efficient iron salt denitrification reaction method for bacteria. The automatic fed-batch type efficient iron salt denitrification reaction device comprises a reaction tank and a seed tank. The reaction tank is connected with the seed tank by an external fed-batch pipe; the reaction tank is sequentially provided with a sludge discharge zone, a water distribution zone, a reaction zone and a three-phase separation zone from bottom to top, and the seed tank is sequentially provided with a liquid storage zone, a breeding zone and an energy storage zone from bottom to top. Wastewater in the reaction tank can be pumped into a water inlet, flows into the reaction zone via the water distribution zone and is subjected to iron salt denitrification; gas, liquid and solid mixtures are separated from one another in the three-phase separation zone; aged sludge can be discharged via sludge discharge outlets. Culture liquid in the seed tank flows into the breeding zone from the liquid storage zone, gas can be generated by seed sludge by means of metabolism, the liquid level of liquid filling pipes of the energy storage zone rises under the effect of gas pressures, and pressure difference can be formed. Valves of fed-batch pipes are turned on, and sludge in the breeding zone can be pushed by the pressure difference to be bed into the reaction tank. The automatic fed-batch type efficient iron salt denitrification reaction device and the automatic fed-batch type efficient iron salt denitrification reaction method have the advantages that seed sludge cultivation and wastewater denitrification are partitioned and can be respectively optimized; the gas can be produced in the seed tank, energy can be stored in the seed tank, and accordingly seed sludge fed-batch effects can be driven without external power; high-activity sludge can be continuously supplemented to the reaction tank, and accordingly the wastewater can be stably and efficiently denitrified.

Description

technical field [0001] The invention relates to a strain self-flowing type high-efficiency iron salt denitrification reaction device and a method thereof. Background technique [0002] Since the implementation of the "one control and two standards" policy in 1996, the content of organic matter in my country's wastewater has been effectively controlled, and nitrogen pollution has become a major environmental problem. According to the 2014 China Environmental Bulletin, the annual ammonia nitrogen discharge amounted to 2.385 million tons, the ammonia nitrogen content in the surface water still exceeds the standard, and the eutrophication of the water body is serious. The removal of nitrogen in the water body is still a major environmental protection problem that needs to be solved urgently. [0003] Traditional denitrification technology mostly uses organic matter as the electron donor, but for the treatment of low C / N ratio wastewater, adding additional organic matter not only...

AI Technical Summary

Problems solved by technology

However, ferric iron is very easy to precipitate, and under neutral conditions, dense ferric salt compounds such as iron oxides or iron hydroxides can be formed to accumulate on the cell surface, hindering the material exchange between cells and the outside world, making cells gradually inactivated and even dead

The highest matrix removal rate of the iron salt denitrification reaction device that has been reported so far is only 0.16±0.01kg-N / (m 3 d), far lower than the removal rate of traditional heterotrophic denitrification technology

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