Multistage anaerobic wastewater treatment method and special device

Abstract

The invention discloses a multistage anaerobic wastewater treatment method which comprises steps as follows: wastewater, of which the CODcr is 2000-20000 mg / L and the pH value is 6-10, is pumped in from the water inlet of a multistage anaerobic wastewater treatment device and mixed with granular sludge on the bottom of the multistage anaerobic wastewater treatment device; the water inlet flow is adjusted to control the hydraulic retention time to 1-5 days; and the wastewater treated by the multistage anaerobic wastewater treatment device is discharged via the water outlet. The fluidized bed structure anaerobic region of the multistage anaerobic wastewater treatment device is in a completely-mixed fluidized state in the starting stage, thereby reinforcing the mass transfer effect between the particle sludge and wastewater, enhancing the biochemical reaction rate, accelerating the sludge granulation progress and greatly shortening the reaction starting time; and in the operating stage, the internal and external circulations of sludge-water mixture are implemented, thereby effectively eliminating the problems of short flow and dead spots, reinforcing the mass transfer effect and greatly enhancing the removal capacity of organic substances.

Description

(1) Technical field [0001] The invention relates to a multi-stage anaerobic wastewater treatment method and a special device for treating wastewater from industries such as printing and dyeing, medicine, chemical industry and tanning with relatively poor biodegradability. (2) Background technology [0002] Anaerobic reaction technology has always been a main content in the field of wastewater treatment, and the development and application of related new processes and new devices has always been a hot spot. Around the mass transfer and reaction process of the reactor, the development of anaerobic reactor has successively experienced the process of digester, UASB (EGSB), ICEB and so on. The in-flow circulation system effectively solves the contradiction between the sludge retention time and fluid hydraulic retention time in the traditional reactor, and becomes the representative of the third-generation high-efficiency anaerobic reactor. The characteristics of IC anaerobic rea...

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Problems solved by technology

The above researches and inventions mainly focus on improving biological activity (increasing DO), solving problems such as downcomer blockage and partition control, and have not yet fundamentally solved the problem of effectively treating waste water with relatively poor biodegradability in industries such as printing and dyeing, medicine, chemical industry, and tanning. problem

In order to solve the problems of poor mass transfer effect between wastewater and granular sludge, easy formation of dead angle and short flow, slow biochemical reaction rate, and poor sludge activity, it is necessary to develop a multi-stage anaerobic wastewater treatment method and special equipment. It can fill the blank of high-efficiency anaerobic reactor in treating difficult biochemical wastewater, and has extremely important engineering application value

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