Efficient and economic airlift type self-circulation granular sludge bed nitrogen removal reactor and method

Abstract

The invention discloses an efficient and economic airlift type self-circulation granular sludge bed nitrogen removal reactor and a method. The reactor comprises a water inlet and distribution area, abiological reaction area, a three-phase separation area and a cyclone separation area from bottom to top, the water inlet and distribution area is provided with a water inlet return pipe and is connected to an internal water distribution device, a filler reaction area is filled with high-efficiency granular sludge and special spherical filler, the cyclone separation area is equipped with a flow guide pipe and a return pipe, the three-phase separation area and the cyclone separation area cooperate to realize the intensified internal circulation of mixed liquid and sludge, so that the matrix inhibition effect is relieved, the problem of floating loss of granular sludge is eliminated, also the operation energy consumption and the equipment cost are reduced, a "low-matrix high-flow" operationmode is proposed and applied, and the volume efficiency of the reactor is greatly improved.

Description

technical field [0001] The invention belongs to the technical field of sewage treatment, in particular to an efficient and economical air-lift self-circulating granular sludge bed denitrification reactor and method. Background technique [0002] With the gradual improvement of environmental protection awareness and the increasingly stringent environmental protection policies, the control and reduction of total nitrogen is extremely important. Among the current denitrification technologies, biological denitrification technology is still the most economical and effective choice. The traditional denitrification technology can be divided into activated sludge method and biofilm method according to the state of biological existence. In the activated sludge method, the organisms exist in the form of flocs. Due to the limitation of the concentration of the sludge mixture, the biomass per unit volume is relatively low, and it is mostly used for low-concentration municipal sewage an...

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Problems solved by technology

In order to obtain a better nitrification and denitrification effect and a stable granulation degree of sludge during operation, the way of effluent backflow is often used to increase the rising flow rate of the reactor and slow down the inhibition of the biological reaction matrix. On the other hand, the high flow rate is not good. It is beneficial to the separation and precipitation of sludge in the reactor, and there will be a phenomenon of sludge running. The resulting contradiction has become a limiting factor for the development and application of the granular sludge bed denitrification reactor.

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