Granule sludge and biological film coupled integrated sewage treatment method and treatment device suitable for same

Abstract

The invention discloses a granule sludge and biological film coupled integrated sewage treatment method and a treatment device suitable for the same. A reactor is internally filled with granule sludge, suspended sludge and filler, wherein a biological film is formed on the filler; the granule sludge is coupled with the suspended sludge and the biological film by utilizing the high efficiency of the granule sludge; meanwhile, a micro-aerobic aeration environment is provided at a proper position in the reactor, and an anaerobic region, an anoxic region and an aerobic region are formed in the reactor, so that an anaerobic microenvironment, an anoxic microenvironment and an aerobic microenvironment are coupled; in addition, the double circulation that part of sludge in the anaerobic region returns to the aerobic region and part of sludge in the aerobic region returns to the anaerobic region is provided, and a proper quantity of sludge in the aerobic region is discharged, so that the synchronous and efficient removal of COD, N, P and the like in sewage is finally realized.

Description

technical field [0001] The invention relates to the technical field of environmental protection, in particular to a granular sludge biofilm coupling integrated sewage treatment method and a treatment device thereof. Background technique [0002] The traditional main process of urban sewage and industrial wastewater treatment - the aerobic process (aerobic activated sludge method or aerobic biofilm method) faces a series of problems such as large area, large amount of residual sludge, and large aeration volume. . [0003] For problems with a large footprint, integration is the direction. [0004] For the problem of large amount of residual sludge and large amount of aeration, the two must be considered together. The aerobic system is precisely because of the large amount of aeration and the rapid growth of sludge (microorganisms), which directly leads to a large amount of residual sludge. For this reason, the most fundamental way to solve the large amount of residual sludg...

AI Technical Summary

Problems solved by technology

Although the high-speed anaerobic reactor can greatly reduce the amount of aeration (without aeration) and the amount of residual sludge (the sludge output is 1 / 5 to 1 / 10 of the aerobic system), but at the same time new problems have emerged: high-speed Anaerobic biological treatment system cannot solve the problem of N and P removal

[0005] Anaerobic expanded granular sludge bed (EGSB) reactor has the characteristics of high sludge concentration and good mass transfer effect, and does not require aeration, the amount of residual sludge is small, and can efficiently remove organic pollutants, which are difficult to degrade the toxicity Pollutants also have a good removal effect, but almost no removal of N and P, and the removal effect of SS is not ideal

Some researchers proposed to add an aerobic membrane bioreactor after the EGSB reactor to strengthen the removal of N, P, chroma and turbidity, etc., but there is a shortage of a large amount of aeration that requires a lot of energy consumption, and the N, P The removal effect is also not ideal (because of the accumulation of metabolites between the two-stage reactors, which in turn affects the treatment effect of the entire system)

Some researchers also proposed to add a membrane module to the EGSB reactor to form an anaerobic membrane bioreactor, and strengthen the removal of N through micro-aerobic aeration, but this method did not solve the problem of P removal in the end.

Some researchers also proposed to form an aerobic-anoxic-anaerobic compound environment through micro-aerobic aeration, relying on the granular sludge in the EGSB reactor, so as to achieve the purpose of synchronously removing COD, N and P, but N and P, especially The removal effect of P is still not good

[0006] For the removal of N, although various reaction mechanisms such as synchronous nitrification and denitrification and short-cut nitrification and denitrification have been proposed, sufficient assurance of anoxic and aerobic environments is still the key; for the removal of P, denitrification and phosphorus removal have also appeared. , anaerobic phosphorus removal and other mechanisms, but it still needs to be combined with anaerobic phosphorus release and aerobic phosphorus uptake by phosphorus removal bacteria to achieve the desired effect

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