Multi-pipe inner circulation three-phase fluidized bed

Abstract

The invention relates to a multi-pipe inner circulation three-phase fluidized bed. The fluidized bed comprises a water inlet pipe, a water outlet pipe, a first reaction region and a gas-liquid separation region; the water outlet pipe is communicated into the first reaction region on the lower portion of the fluidized bed, a second reaction sedimentation region is arranged above the first reaction region, a first sewage return pipe is arranged below the second reaction sedimentation region, a gas raising pipe is arranged on the upper portion and communicated to the gas-liquid separation region, a filtering region is arranged above the second reaction sedimentation region, the water outlet pipe is communicated to the filtering region, the gas-liquid separation region is arranged above the filtering region, a marsh gas pipe is arranged at the top of the gas-liquid separation region, a second sewage return pipe is arranged at the bottom of the gas-liquid separation region and communicated into the first reaction region, and a skimming region is arranged in the gas-liquid separation. The fluidized bed is compact in structure, stable in operation and low in operation cost and integrates biochemical treatment, gas and marsh solid separation and marsh gas collection.

Description

technical field [0001] The invention relates to a three-compartment fluidized bed in a sewage or sludge treatment UASB reactor, in particular to a multi-pipe internal circulation three-phase fluidized bed. Background technique [0002] At present, the three-phase fluidized bed in the UASB reactor controls the formation of scum or scum at the gas-liquid two-phase interface in the gas collection chamber of the three-phase separator. These scum or scum hinder the release of air bubbles and affect the collection of biogas . [0003] In the traditional three-phase biological fluidized bed, neither the gas velocity nor the liquid velocity can be very large. If it greatly exceeds the terminal sedimentation velocity of the carrier, a large number of biological particles will enter the sedimentation and separation area because the carrier only moves upward in one direction. Therefore, Very easy to take out of the reactor. In order to prevent the loss of the carrier, the shear force...

AI Technical Summary

Problems solved by technology

[0002] At present, the three-phase fluidized bed in the UASB reactor controls the formation of scum or scum at the gas-liquid two-phase interface in the gas collection chamber of the three-phase separator. These scum or scum hinder the release of air bubbles and affect the collection of biogas

[0003] In the traditional three-phase biological fluidized bed, neither the gas velocity nor the liquid velocity can be very large. If it greatly exceeds the terminal sedimentation velocity of the carrier, a large number of biological particles will enter the sedimentation and separation area because the carrier only moves upward in one direction. Therefore, Very easy to take out of the reactor

In order to prevent the loss of the carrier, the shear force of the fluid in the reactor cannot effectively control the excessive growth of the biofilm

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